The Java Version Almanac
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New APIs in Java 21

Comparing Java 21 (21-ea+6-365-open) with Java 17 (17.0.6+10-tem).

Element Modification
java.base
    java.io
      BufferedInputStream
        • - final
        • + sealed
        FileInputStream
          InvalidClassException
            InvalidObjectException
              ObjectInputStream.GetField
                • + throws ClassNotFoundException
                • + final
                ObjectStreamException
                  PrintStream
                    PushbackInputStream
                      SequenceInputStream
                        java.lang.constant
                          ClassDesc
                            java.lang.invoke
                              • + sealed
                              • + sealed
                              • + final
                              MethodHandles
                                • + sealed
                                java.lang.module
                                  ModuleDescriptor.Exports
                                    ModuleDescriptor.Opens
                                      ModuleDescriptor.Requires
                                        ModuleDescriptor
                                          java.lang.ref
                                            ReferenceQueue
                                              • - throws IllegalArgumentException
                                              • + sealed
                                              java.lang.reflect
                                                Executable
                                                  • + abstract
                                                  Field
                                                    Method
                                                      • - throws IllegalArgumentException
                                                      Parameter
                                                        Member
                                                          java.lang
                                                            Character.UnicodeBlock
                                                              Class
                                                                Double
                                                                  Enum
                                                                    • + deprecated
                                                                    • + forRemoval
                                                                    Float
                                                                      Integer
                                                                        Long
                                                                          Math
                                                                            ModuleLayer.Controller
                                                                              Module
                                                                                Object
                                                                                  • + forRemoval
                                                                                  Runtime
                                                                                    • + deprecated
                                                                                    • + deprecated
                                                                                    • + deprecated
                                                                                    • + deprecated
                                                                                    • + forRemoval
                                                                                    StrictMath
                                                                                      System
                                                                                        • + deprecated
                                                                                        • + forRemoval
                                                                                        • + deprecated
                                                                                        • + forRemoval
                                                                                        ThreadGroup
                                                                                          allowThreadSuspension(boolean)
                                                                                          Thread
                                                                                            • + deprecated
                                                                                            • + forRemoval
                                                                                            Character.UnicodeScript
                                                                                              java.math
                                                                                                BigDecimal
                                                                                                  BigInteger
                                                                                                    java.net.spi
                                                                                                      java.net
                                                                                                        • + sealed
                                                                                                        SocketException
                                                                                                          URL
                                                                                                            • + deprecated
                                                                                                            • + deprecated
                                                                                                            • + deprecated
                                                                                                            • + deprecated
                                                                                                            • + deprecated
                                                                                                            • + deprecated
                                                                                                            java.nio.channels
                                                                                                              FileChannel
                                                                                                                java.nio.charset
                                                                                                                  Charset
                                                                                                                    java.nio.file.spi
                                                                                                                      FileSystemProvider
                                                                                                                        java.nio
                                                                                                                          • + sealed
                                                                                                                          • + sealed
                                                                                                                          • + sealed
                                                                                                                          • + sealed
                                                                                                                          • + sealed
                                                                                                                          • + sealed
                                                                                                                          • + sealed
                                                                                                                          • + sealed
                                                                                                                          • + sealed
                                                                                                                          java.security.cert
                                                                                                                            CertStore
                                                                                                                              • - final
                                                                                                                              java.security.interfaces
                                                                                                                                DSAKeyPairGenerator
                                                                                                                                  • - throws InvalidParameterException
                                                                                                                                  • - throws InvalidParameterException
                                                                                                                                  java.security.spec
                                                                                                                                    PSSParameterSpec
                                                                                                                                      • + deprecated
                                                                                                                                      • + deprecated
                                                                                                                                      java.security
                                                                                                                                        InvalidParameterException
                                                                                                                                          KeyStoreSpi
                                                                                                                                            KeyStore
                                                                                                                                              java.text
                                                                                                                                                DecimalFormatSymbols
                                                                                                                                                  java.time.chrono
                                                                                                                                                    IsoChronology
                                                                                                                                                      JapaneseChronology
                                                                                                                                                        MinguoChronology
                                                                                                                                                          ThaiBuddhistChronology
                                                                                                                                                            Chronology
                                                                                                                                                              java.time.format
                                                                                                                                                                DateTimeFormatterBuilder
                                                                                                                                                                  DateTimeFormatter
                                                                                                                                                                    java.time
                                                                                                                                                                      Duration
                                                                                                                                                                        • + sealed
                                                                                                                                                                        ZoneOffset
                                                                                                                                                                          java.util.concurrent
                                                                                                                                                                            CompletableFuture
                                                                                                                                                                              • + final
                                                                                                                                                                              Executors
                                                                                                                                                                                ForkJoinPool
                                                                                                                                                                                  ForkJoinTask
                                                                                                                                                                                    ForkJoinWorkerThread
                                                                                                                                                                                      FutureTask
                                                                                                                                                                                        • + final
                                                                                                                                                                                        ThreadPoolExecutor
                                                                                                                                                                                          • + forRemoval
                                                                                                                                                                                          • + implements AutoCloseable
                                                                                                                                                                                          Future
                                                                                                                                                                                            java.util.regex
                                                                                                                                                                                              Matcher
                                                                                                                                                                                                Pattern
                                                                                                                                                                                                  MatchResult
                                                                                                                                                                                                    java.util.spi
                                                                                                                                                                                                      ToolProvider
                                                                                                                                                                                                        java.util.zip
                                                                                                                                                                                                          ZipInputStream
                                                                                                                                                                                                            java.util
                                                                                                                                                                                                              • + sealed
                                                                                                                                                                                                              HashMap
                                                                                                                                                                                                                HashSet
                                                                                                                                                                                                                  IdentityHashMap
                                                                                                                                                                                                                    • + sealed
                                                                                                                                                                                                                    LinkedHashMap
                                                                                                                                                                                                                      LinkedHashSet
                                                                                                                                                                                                                        Locale
                                                                                                                                                                                                                          • + deprecated
                                                                                                                                                                                                                          • + deprecated
                                                                                                                                                                                                                          • + deprecated
                                                                                                                                                                                                                          Objects
                                                                                                                                                                                                                            Random
                                                                                                                                                                                                                              WeakHashMap
                                                                                                                                                                                                                                javax.crypto.spec
                                                                                                                                                                                                                                  OAEPParameterSpec
                                                                                                                                                                                                                                    • + deprecated
                                                                                                                                                                                                                                    javax.net.ssl
                                                                                                                                                                                                                                      KeyManagerFactory
                                                                                                                                                                                                                                        • - final
                                                                                                                                                                                                                                        SSLHandshakeException
                                                                                                                                                                                                                                          SSLKeyException
                                                                                                                                                                                                                                            SSLParameters
                                                                                                                                                                                                                                              SSLPeerUnverifiedException
                                                                                                                                                                                                                                                SSLProtocolException
                                                                                                                                                                                                                                                  TrustManagerFactory
                                                                                                                                                                                                                                                    • - final
                                                                                                                                                                                                                                                    SSLSessionContext
                                                                                                                                                                                                                                                      • - throws IllegalArgumentException
                                                                                                                                                                                                                                                      • - throws IllegalArgumentException
                                                                                                                                                                                                                                                      javax.security.auth
                                                                                                                                                                                                                                                        Subject
                                                                                                                                                                                                                                                          • + deprecated
                                                                                                                                                                                                                                                          • + forRemoval
                                                                                                                                                                                                                                                          • + deprecated
                                                                                                                                                                                                                                                          • + forRemoval
                                                                                                                                                                                                                                                          java.compiler
                                                                                                                                                                                                                                                            javax.annotation.processing
                                                                                                                                                                                                                                                              Messager
                                                                                                                                                                                                                                                                javax.lang.model.element
                                                                                                                                                                                                                                                                  ElementKind
                                                                                                                                                                                                                                                                    ExecutableElement
                                                                                                                                                                                                                                                                      javax.lang.model.util
                                                                                                                                                                                                                                                                        Elements
                                                                                                                                                                                                                                                                          javax.lang.model
                                                                                                                                                                                                                                                                            SourceVersion
                                                                                                                                                                                                                                                                              javax.tools
                                                                                                                                                                                                                                                                                ForwardingJavaFileManager
                                                                                                                                                                                                                                                                                  DocumentationTool.Location
                                                                                                                                                                                                                                                                                    JavaFileManager
                                                                                                                                                                                                                                                                                      java.desktop
                                                                                                                                                                                                                                                                                        java.awt.color
                                                                                                                                                                                                                                                                                          • + final
                                                                                                                                                                                                                                                                                          • + final
                                                                                                                                                                                                                                                                                          • + sealed
                                                                                                                                                                                                                                                                                          finalize()
                                                                                                                                                                                                                                                                                          java.awt.desktop
                                                                                                                                                                                                                                                                                            • + sealed
                                                                                                                                                                                                                                                                                            • + sealed
                                                                                                                                                                                                                                                                                            java.awt.dnd
                                                                                                                                                                                                                                                                                              • + final
                                                                                                                                                                                                                                                                                              java.awt.event
                                                                                                                                                                                                                                                                                                • + sealed
                                                                                                                                                                                                                                                                                                java.awt.geom
                                                                                                                                                                                                                                                                                                  CubicCurve2D.Double
                                                                                                                                                                                                                                                                                                    getBounds2D()
                                                                                                                                                                                                                                                                                                    CubicCurve2D.Float
                                                                                                                                                                                                                                                                                                      getBounds2D()
                                                                                                                                                                                                                                                                                                      CubicCurve2D
                                                                                                                                                                                                                                                                                                        • + sealed
                                                                                                                                                                                                                                                                                                        QuadCurve2D.Double
                                                                                                                                                                                                                                                                                                          getBounds2D()
                                                                                                                                                                                                                                                                                                          QuadCurve2D.Float
                                                                                                                                                                                                                                                                                                            getBounds2D()
                                                                                                                                                                                                                                                                                                            QuadCurve2D
                                                                                                                                                                                                                                                                                                              java.awt.image
                                                                                                                                                                                                                                                                                                                ColorModel
                                                                                                                                                                                                                                                                                                                  finalize()
                                                                                                                                                                                                                                                                                                                  IndexColorModel
                                                                                                                                                                                                                                                                                                                    finalize()
                                                                                                                                                                                                                                                                                                                    java.awt
                                                                                                                                                                                                                                                                                                                      Graphics
                                                                                                                                                                                                                                                                                                                        • + forRemoval
                                                                                                                                                                                                                                                                                                                        • + final
                                                                                                                                                                                                                                                                                                                        • + sealed
                                                                                                                                                                                                                                                                                                                        • + final
                                                                                                                                                                                                                                                                                                                        PrintJob
                                                                                                                                                                                                                                                                                                                          • + forRemoval
                                                                                                                                                                                                                                                                                                                          • + final
                                                                                                                                                                                                                                                                                                                          • + sealed
                                                                                                                                                                                                                                                                                                                          javax.imageio.spi
                                                                                                                                                                                                                                                                                                                            ServiceRegistry
                                                                                                                                                                                                                                                                                                                              • + forRemoval
                                                                                                                                                                                                                                                                                                                              javax.imageio.stream
                                                                                                                                                                                                                                                                                                                                FileCacheImageInputStream
                                                                                                                                                                                                                                                                                                                                  • + forRemoval
                                                                                                                                                                                                                                                                                                                                  FileImageInputStream
                                                                                                                                                                                                                                                                                                                                    • + forRemoval
                                                                                                                                                                                                                                                                                                                                    FileImageOutputStream
                                                                                                                                                                                                                                                                                                                                      • + forRemoval
                                                                                                                                                                                                                                                                                                                                      ImageInputStreamImpl
                                                                                                                                                                                                                                                                                                                                        • + forRemoval
                                                                                                                                                                                                                                                                                                                                        MemoryCacheImageInputStream
                                                                                                                                                                                                                                                                                                                                          • + forRemoval
                                                                                                                                                                                                                                                                                                                                          javax.sound.midi
                                                                                                                                                                                                                                                                                                                                            • + final
                                                                                                                                                                                                                                                                                                                                            javax.swing.plaf.basic
                                                                                                                                                                                                                                                                                                                                              BasicDirectoryModel
                                                                                                                                                                                                                                                                                                                                                • + forRemoval
                                                                                                                                                                                                                                                                                                                                                • + forRemoval
                                                                                                                                                                                                                                                                                                                                                • + forRemoval
                                                                                                                                                                                                                                                                                                                                                • + forRemoval
                                                                                                                                                                                                                                                                                                                                                • + forRemoval
                                                                                                                                                                                                                                                                                                                                                • + forRemoval
                                                                                                                                                                                                                                                                                                                                                • + forRemoval
                                                                                                                                                                                                                                                                                                                                                • + forRemoval
                                                                                                                                                                                                                                                                                                                                                • + sealed
                                                                                                                                                                                                                                                                                                                                                BasicToolBarUI
                                                                                                                                                                                                                                                                                                                                                  • + forRemoval
                                                                                                                                                                                                                                                                                                                                                  javax.swing.plaf.synth
                                                                                                                                                                                                                                                                                                                                                    SynthComboBoxUI
                                                                                                                                                                                                                                                                                                                                                      SynthPasswordFieldUI
                                                                                                                                                                                                                                                                                                                                                        javax.swing.text.html
                                                                                                                                                                                                                                                                                                                                                          • + final
                                                                                                                                                                                                                                                                                                                                                          • + final
                                                                                                                                                                                                                                                                                                                                                          • + final
                                                                                                                                                                                                                                                                                                                                                          javax.swing.text
                                                                                                                                                                                                                                                                                                                                                            DefaultEditorKit
                                                                                                                                                                                                                                                                                                                                                              • + final
                                                                                                                                                                                                                                                                                                                                                              • + final
                                                                                                                                                                                                                                                                                                                                                              • + final
                                                                                                                                                                                                                                                                                                                                                              • + final
                                                                                                                                                                                                                                                                                                                                                              • + sealed
                                                                                                                                                                                                                                                                                                                                                              javax.swing
                                                                                                                                                                                                                                                                                                                                                                • + sealed
                                                                                                                                                                                                                                                                                                                                                                • + sealed
                                                                                                                                                                                                                                                                                                                                                                • + final
                                                                                                                                                                                                                                                                                                                                                                • + final
                                                                                                                                                                                                                                                                                                                                                                java.management
                                                                                                                                                                                                                                                                                                                                                                  java.lang.management
                                                                                                                                                                                                                                                                                                                                                                    MemoryMXBean
                                                                                                                                                                                                                                                                                                                                                                      • + deprecated
                                                                                                                                                                                                                                                                                                                                                                      javax.management.loading
                                                                                                                                                                                                                                                                                                                                                                        • + deprecated
                                                                                                                                                                                                                                                                                                                                                                        • + forRemoval
                                                                                                                                                                                                                                                                                                                                                                        • + deprecated
                                                                                                                                                                                                                                                                                                                                                                        • + forRemoval
                                                                                                                                                                                                                                                                                                                                                                        • + deprecated
                                                                                                                                                                                                                                                                                                                                                                        • + forRemoval
                                                                                                                                                                                                                                                                                                                                                                        • + deprecated
                                                                                                                                                                                                                                                                                                                                                                        • + forRemoval
                                                                                                                                                                                                                                                                                                                                                                        java.net.http
                                                                                                                                                                                                                                                                                                                                                                          java.net.http
                                                                                                                                                                                                                                                                                                                                                                            HttpClient.Builder
                                                                                                                                                                                                                                                                                                                                                                              HttpRequest.Builder
                                                                                                                                                                                                                                                                                                                                                                                java.xml
                                                                                                                                                                                                                                                                                                                                                                                  javax.xml.xpath
                                                                                                                                                                                                                                                                                                                                                                                    XPathFactory

                                                                                                                                                                                                                                                                                                                                                                                      This report is based on simple comparison of all public and protected APIs of the java.* and javax.* packages of JDK builds 21-ea+6-365-open and 17.0.6+10-tem. It does not make statements about compatibility.

                                                                                                                                                                                                                                                                                                                                                                                      For the latest Java versions the corresponding CSRs (Compatibility & Specification Review) are linked for a quick reference to find out about the reasoning of the change.

                                                                                                                                                                                                                                                                                                                                                                                      More detailed API comparisons based on the japicmp tool can be found here.