OpenJDK 27 · jdk.internal.access.JavaLangAccess · APIdia, the JavaDoc alternative

Method Summary

Modifier and Type	Method and Description
public void	addEnableFinalMutationToAllUnnamed() Enable code in all unnamed modules to mutate final instance fields.
public void	addEnableNativeAccess(Module m) Updates module m to allow access to restricted methods.
public boolean	addEnableNativeAccess(ModuleLayer layer, String name) Updates module named `name` in layer `layer` to allow access to restricted methods.
public void	addEnableNativeAccessToAllUnnamed() Updates all unnamed modules to allow access to restricted methods.
public void	addExports(Module m1, String pkg) Updates module m1 to export a package unconditionally.
public void	addExports(Module m1, String pkg, Module m2) Updates module m1 to export a package to module m2.
public void	addExportsToAllUnnamed(Module m, String pkg) Updates a module m to export a package to all unnamed modules.
public void	addOpens(Module m1, String pkg, Module m2) Updates module m1 to open a package to module m2.
public void	addOpensToAllUnnamed(Module m, String pkg) Updates module m to open a package to all unnamed modules.
public void	addReads(Module m1, Module m2) Updates the readability so that module m1 reads m2.
public void	addReadsAllUnnamed(Module m) Updates module m to read all unnamed modules.
public void	addUses(Module m, Class<?> service) Updates module m to use a service.
public void	bindToLoader(ModuleLayer layer, ClassLoader loader) Record that this layer has at least one module defined to the given class loader.
public void	blockedOn(Interruptible b) Set current thread's blocker field.
public boolean	bytesCompatible(String string, Charset charset, int srcIndex, int numChars) Are the string bytes compatible with the given charset?
public boolean	casAnnotationType(Class<?> klass, AnnotationType oldType, AnnotationType newType) Compare-And-Set the AnnotationType instance corresponding to this class.
public Object	classData(Class<?> c)
public int	classFileVersion(Class<?> clazz) Returns the big-endian packed minor-major version of the class file of this class.
public String	concat(String prefix, Object value, String suffix) Concatenation of prefix and suffix characters to a String for early bootstrap
public void	copyToSegmentRaw(String string, MemorySegment segment, long offset, int srcIndex, int srcLength) Copy the string bytes to an existing segment, avoiding intermediate copies.
public int	countNonZeroAscii(String s) Count the number of leading non-zero ascii chars in the String.
public int	countPositives(byte[] ba, int off, int len) Count the number of leading positive bytes in the range.
public ConcurrentHashMap<?, ?>	createOrGetClassLoaderValueMap(ClassLoader cl) Returns the ConcurrentHashMap used as a storage for ClassLoaderValue(s) associated with the given class loader, creating it if it doesn't already exist.
public Thread	currentCarrierThread() Returns the Thread object for the current platform thread.
public int	Returns: the number of bytes successfully decoded, at most len decodeASCII(byte[] src, int srcOff, char[] dst, int dstOff, int len) Decodes ASCII from the source byte array into the destination char array.
public Class<?>	defineClass(ClassLoader cl, String name, byte[] b, ProtectionDomain pd, String source) Defines a class with the given name to a class loader.
public Class<?>	defineClass(ClassLoader cl, Class<?> lookup, String name, byte[] b, ProtectionDomain pd, boolean initialize, int flags, Object classData) Defines a class with the given name to a class loader with the given flags and class data.
public Module	defineModule(ClassLoader loader, ModuleDescriptor descriptor, URI uri) Defines a new module to the Java virtual machine.
public Package	definePackage(ClassLoader cl, String name, Module module) Define a Package of the given name and module by the given class loader.
public Module	defineUnnamedModule(ClassLoader loader) Defines the unnamed module for the given class loader.
public int	Returns: the total number of characters successfully encoded encodeASCII(char[] the source character array sa, int the index of the source array to start reading from sp, byte[] the target byte array da, int the index of the target array to start writing to dp, int the total number of characters to be encoded len) Encodes as many ASCII codepoints as possible from the source character array into the destination byte array, assuming that the encoding is ASCII compatible.
public void	ensureNativeAccess(Module the module in which native access occurred m, Class<?> the owner of the restricted method being called (or the JNI method being bound) owner, String the name of the restricted method being called (or the JNI method being bound) methodName, Class<?> the class calling the restricted method (for JNI, this is the same as `owner`) currentClass, boolean `true`, if this event is related to a JNI method being bound jni) Ensure that the given module has native access.
public Class<?>	findBootstrapClassOrNull(String name) Returns a class loaded by the bootstrap class loader.
public Method	findMethod(Class<?> klass, boolean publicOnly, String name, Class<?>... parameterTypes) Return most specific method that matches name and parameterTypes.
public void	finishInit(StackTraceElement[] stackTrace) Finish initialization of the StackTraceElement objects in a stack trace.
public Thread[]	getAllThreads() Returns an array of all platform threads.
public AnnotationType	getAnnotationType(Class<?> klass) Get the AnnotationType instance corresponding to this class.
public byte[]	Returns: the sequence of bytes obtained by encoding the given string in UTF-8 getBytesUTF8OrThrow(String the string to encode s) Returns the sequence of bytes obtained by encoding the given string in UTF-8.
public <T> T	getCarrierThreadLocal(CarrierThreadLocal<T> local) Returns the value of the current carrier thread's copy of a thread-local.
public int	getClassFileAccessFlags(Class<?> klass) Get the int value of the Class's class-file access flags.
public ConstantPool	getConstantPool(Class<?> klass) Return the constant pool for a class.
public Continuation	getContinuation(Thread thread) Returns the innermost mounted continuation
public Map<Class<? extends Annotation>, Annotation>	getDeclaredAnnotationMap(Class<?> klass) Get the declared annotations for a given class, indexed by their types.
public List<Method>	getDeclaredPublicMethods(Class<?> klass, String name, Class<?>... parameterTypes) Returns the list of `Method` objects for the declared public methods of this class or interface that have the specified method name and parameter types.
public <E extends Enum<E>> E[]	getEnumConstantsShared(Class<E> klass) Returns the elements of an enum class or null if the Class object does not represent an enum type; the result is uncloned, cached, and shared by all callers.
public String	getLoaderNameID(ClassLoader loader) Returns '<loader-name>' @<id> if classloader has a name explicitly set otherwise <qualified-class-name> @<id>
public byte[]	getRawClassAnnotations(Class<?> klass) Get the array of bytes that is the class-file representation of this Class' annotations.
public byte[]	getRawClassTypeAnnotations(Class<?> klass) Get the array of bytes that is the class-file representation of this Class' type annotations.
public byte[]	getRawExecutableTypeAnnotations(Executable executable) Get the array of bytes that is the class-file representation of this Executable's type annotations.
public ServicesCatalog	getServicesCatalog(ModuleLayer layer) Returns the ServicesCatalog for the given Layer.
public StackableScope	headStackableScope(Thread thread) Returns the top of the given thread's stackable scope stack.
public void	inflateBytesToChars(byte[] src, int srcOff, char[] dst, int dstOff, int len) Inflated copy from `byte[]` to `char[]`, as defined by `StringLatin1.inflate`.
public PrintStream	initialSystemErr() Returns the initial value of System.err.
public InputStream	initialSystemIn() Returns the initial `System.in` to determine if it is replaced with `System.setIn(newIn)` method
public void	invokeFinalize(Object o) Invokes the finalize method of the given object.
public boolean	isFinalMutationEnabled(Module m) Return true if code in a given module is allowed to mutate final instance fields.
public boolean	isReflectivelyExported(Module module, String pn, Module other) Returns true if module m reflectively exports a package to other
public boolean	isReflectivelyOpened(Module module, String pn, Module other) Returns true if module m reflectively opens a package to other
public boolean	isStaticallyExported(Module module, String pn, Module other) Return true if a given module has statically exported the given package to a given other module.
public boolean	isStaticallyOpened(Module module, String pn, Module other) Return true if a given module has statically opened the given package to a given other module.
public String	join(String prefix, String suffix, String delimiter, String[] elements, int size) Join strings
public Stream<ModuleLayer>	layers(ModuleLayer layer) Returns an ordered stream of layers.
public Stream<ModuleLayer>	layers(ClassLoader loader) Returns a stream of the layers that have modules defined to the given class loader.
public NativeLibraries	nativeLibrariesFor(ClassLoader loader) Returns the `NativeLibraries` object associated with the provided class loader.
public long	nativeThreadID(Thread thread) Returns the native thread ID for the given platform thread or 0 if not set.
public StackWalker	newStackWalkerInstance(Set<StackWalker.Option> options, ContinuationScope contScope, Continuation continuation) Creates a new StackWalker
public void	parkVirtualThread() Parks the current virtual thread.
public void	parkVirtualThread(long the maximum number of nanoseconds to wait nanos) Parks the current virtual thread for up to the given waiting time.
public ProtectionDomain	protectionDomain(Class<?> c) Get protection domain of the given Class
public void	registerShutdownHook(int the slot in the shutdown hook array, whose element will be invoked in order during shutdown slot, boolean true to allow the hook to be registered even if the shutdown is in progress. registerShutdownInProgress, Runnable the hook to be registered hook) Registers a shutdown hook.
public void	removeCarrierThreadLocal(CarrierThreadLocal<?> local) Removes the value of the current carrier thread's copy of a thread-local.
public Object	scopedValueBindings() Return the current thread's scoped value bindings.
public Object[]	scopedValueCache() Returns the current thread's scoped values cache
public <T> void	setCarrierThreadLocal(CarrierThreadLocal<T> local, T value) Sets the value of the current carrier thread's copy of a thread-local.
public void	setCause(Throwable t, Throwable set t's cause to new value cause) Set the cause of Throwable
public void	setContinuation(Thread thread, Continuation continuation) Sets the innermost mounted continuation
public void	setHeadStackableScope(StackableScope scope) Sets the top of the current thread's stackable scope stack.
public void	setScopedValueCache(Object[] cache) Sets the current thread's scoped values cache
public void	setThreadNativeID(long id) Sets the native thread ID for the current platform thread.
public void	start(Thread thread, ThreadContainer container) Starts a thread in the given ThreadContainer.
public byte	stringCoder(String str) Get the Coder of String, which is used by StringConcatFactory to calculate the initCoder of constants
public MethodHandle	stringConcatHelper(String name, MethodType methodType) Get a method handle of string concat helper method
public byte	stringInitCoder() Get the string initial coder, When COMPACT_STRINGS is on, it returns 0, and when it is off, it returns 1.
public ThreadContainer	threadContainer(Thread thread) Returns the ThreadContainer for a thread, may be null.
public boolean	tryEnableFinalMutation(Module m) Enable code in a given module to mutate final instance fields.
public byte[]	Returns: the sequence of bytes obtained by encoding the given string in the specified `Charset` uncheckedGetBytesOrThrow(String the string to encode s, Charset the charset cs) Returns the sequence of bytes obtained by encoding the given string in the specified `Charset`.
public char	Returns: the char value uncheckedGetUTF16Char(byte[] the UTF-16 encoded bytes bytes, int of the char to retrieve, 0 <= index < (bytes.length >> 1) index) Get the `char` at `index` in a `byte[]` in internal UTF-16 representation.
public String	Returns: the newly created string uncheckedNewStringOrThrow(byte[] the byte array source bytes, Charset the Charset cs) Constructs a new `String` by decoding the specified byte array using the specified `Charset`.
public String	Returns: the newly created string uncheckedNewStringWithLatin1Bytes(byte[] the byte array source bytes) Constructs a new `String` with the supplied Latin1 bytes.
public void	uncheckedPutCharUTF16(byte[] the UTF-16 encoded bytes bytes, int of the char to retrieve, 0 <= index < (bytes.length >> 1) index, int ch) Put the `ch` at `index` in a `byte[]` in internal UTF-16 representation.
public Object	uncheckedStringConcat1(String[] constants) Creates helper for string concatenation.
public void	unparkVirtualThread(Thread the virtual thread to unpark thread) Re-enables a virtual thread for scheduling.
public ContinuationScope	virtualThreadContinuationScope() The ContinuationScope of virtual thread continuations
public Executor	virtualThreadDefaultScheduler() Returns the virtual thread default scheduler.

Method Detail

addEnableFinalMutationToAllUnnamed	back to summary
public void addEnableFinalMutationToAllUnnamed() Enable code in all unnamed modules to mutate final instance fields.

addEnableNativeAccess	back to summary
public void addEnableNativeAccess(Module m) Updates module m to allow access to restricted methods.

addEnableNativeAccess	back to summary
public boolean addEnableNativeAccess(ModuleLayer layer, String name) Updates module named `name` in layer `layer` to allow access to restricted methods. Returns true iff the given module exists in the given layer.

addEnableNativeAccessToAllUnnamed	back to summary
public void addEnableNativeAccessToAllUnnamed() Updates all unnamed modules to allow access to restricted methods.

addExports	back to summary
public void addExports(Module m1, String pkg) Updates module m1 to export a package unconditionally.

addExports	back to summary
public void addExports(Module m1, String pkg, Module m2) Updates module m1 to export a package to module m2. The export does not result in a strong reference to m2 (m2 can be GC'ed).

addExportsToAllUnnamed	back to summary
public void addExportsToAllUnnamed(Module m, String pkg) Updates a module m to export a package to all unnamed modules.

addOpens	back to summary
public void addOpens(Module m1, String pkg, Module m2) Updates module m1 to open a package to module m2. Opening the package does not result in a strong reference to m2 (m2 can be GC'ed).

addOpensToAllUnnamed	back to summary
public void addOpensToAllUnnamed(Module m, String pkg) Updates module m to open a package to all unnamed modules.

addReads	back to summary
public void addReads(Module m1, Module m2) Updates the readability so that module m1 reads m2. The new read edge does not result in a strong reference to m2 (m2 can be GC'ed). This method is the same as m1.addReads(m2) but without a caller check.

addReadsAllUnnamed	back to summary
public void addReadsAllUnnamed(Module m) Updates module m to read all unnamed modules.

addUses	back to summary
public void addUses(Module m, Class<?> service) Updates module m to use a service.

bindToLoader	back to summary
public void bindToLoader(ModuleLayer layer, ClassLoader loader) Record that this layer has at least one module defined to the given class loader.

blockedOn	back to summary
public void blockedOn(Interruptible b) Set current thread's blocker field.

bytesCompatible	back to summary
public boolean bytesCompatible(String string, Charset charset, int srcIndex, int numChars) Are the string bytes compatible with the given charset?

casAnnotationType	back to summary
public boolean casAnnotationType(Class<?> klass, AnnotationType oldType, AnnotationType newType) Compare-And-Set the AnnotationType instance corresponding to this class. (This method only applies to annotation types.)

classData	back to summary
public Object classData(Class<?> c)

classFileVersion	back to summary
public int classFileVersion(Class<?> clazz) Returns the big-endian packed minor-major version of the class file of this class.

concat	back to summary
public String concat(String prefix, Object value, String suffix) Concatenation of prefix and suffix characters to a String for early bootstrap

copyToSegmentRaw	back to summary
public void copyToSegmentRaw(String string, MemorySegment segment, long offset, int srcIndex, int srcLength) Copy the string bytes to an existing segment, avoiding intermediate copies.

countNonZeroAscii	back to summary
public int countNonZeroAscii(String s) Count the number of leading non-zero ascii chars in the String.

countPositives	back to summary
public int countPositives(byte[] ba, int off, int len) Count the number of leading positive bytes in the range. Implementation Specification Implementations of this method must perform bounds checks.

createOrGetClassLoaderValueMap	back to summary
public ConcurrentHashMap<?, ?> createOrGetClassLoaderValueMap(ClassLoader cl) Returns the ConcurrentHashMap used as a storage for ClassLoaderValue(s) associated with the given class loader, creating it if it doesn't already exist.

currentCarrierThread	back to summary
public Thread currentCarrierThread() Returns the Thread object for the current platform thread. If the current thread is a virtual thread then this method returns the carrier.

decodeASCII	back to summary
public int decodeASCII(byte[] src, int srcOff, char[] dst, int dstOff, int len) Decodes ASCII from the source byte array into the destination char array. Implementation Specification Implementations of this method must perform bounds checks. Returns:int the number of bytes successfully decoded, at most len

decodeASCII

back to summary

public int decodeASCII(byte[] src, int srcOff, char[] dst, int dstOff, int len)

Decodes ASCII from the source byte array into the destination char array.

Implementation Specification

Implementations of this method must perform bounds checks.

Returns:int: the number of bytes successfully decoded, at most len

defineClass	back to summary
public Class<?> defineClass(ClassLoader cl, String name, byte[] b, ProtectionDomain pd, String source) Defines a class with the given name to a class loader.

defineClass back to summary

defineClass	back to summary
public Class<?> defineClass(ClassLoader cl, Class<?> lookup, String name, byte[] b, ProtectionDomain pd, boolean initialize, int flags, Object classData) Defines a class with the given name to a class loader with the given flags and class data. See Also `java.lang.invoke.MethodHandles.Lookup#defineClass`

public Class<?> defineClass(ClassLoader cl, Class<?> lookup, String name, byte[] b, ProtectionDomain pd, boolean initialize, int flags, Object classData)

Defines a class with the given name to a class loader with the given flags and class data.

See Also: java.lang.invoke.MethodHandles.Lookup#defineClass

defineModule	back to summary
public Module defineModule(ClassLoader loader, ModuleDescriptor descriptor, URI uri) Defines a new module to the Java virtual machine. The module is defined to the given class loader. The URI is for information purposes only, it can be `null`.

definePackage	back to summary
public Package definePackage(ClassLoader cl, String name, Module module) Define a Package of the given name and module by the given class loader.

defineUnnamedModule	back to summary
public Module defineUnnamedModule(ClassLoader loader) Defines the unnamed module for the given class loader.

encodeASCII	back to summary
public int encodeASCII(char[] sa, int sp, byte[] da, int dp, int len) Encodes as many ASCII codepoints as possible from the source character array into the destination byte array, assuming that the encoding is ASCII compatible. Parameters sa:char[] the source character array sp:int the index of the source array to start reading from da:byte[] the target byte array dp:int the index of the target array to start writing to len:int the total number of characters to be encoded Returns:int the total number of characters successfully encoded Exceptions NullPointerException: if any of the provided arrays is null

encodeASCII

back to summary

public int encodeASCII(char[] sa, int sp, byte[] da, int dp, int len)

Encodes as many ASCII codepoints as possible from the source character array into the destination byte array, assuming that the encoding is ASCII compatible.

Parameters

sa:char[]: the source character array
sp:int: the index of the source array to start reading from
da:byte[]: the target byte array
dp:int: the index of the target array to start writing to
len:int: the total number of characters to be encoded

Returns:int

the total number of characters successfully encoded

Exceptions

NullPointerException:: if any of the provided arrays is null

ensureNativeAccess back to summary

ensureNativeAccess	back to summary
public void ensureNativeAccess(Module m, Class<?> owner, String methodName, Class<?> currentClass, boolean jni) Ensure that the given module has native access. If not, warn or throw exception depending on the configuration. Parameters m:Module the module in which native access occurred owner:Class<?> the owner of the restricted method being called (or the JNI method being bound) methodName:String the name of the restricted method being called (or the JNI method being bound) currentClass:Class<?> the class calling the restricted method (for JNI, this is the same as `owner`) jni:boolean `true`, if this event is related to a JNI method being bound

public void ensureNativeAccess(Module m, Class<?> owner, String methodName, Class<?> currentClass, boolean jni)

Ensure that the given module has native access. If not, warn or throw exception depending on the configuration.

Parameters

m:Module: the module in which native access occurred
owner:Class<?>: the owner of the restricted method being called (or the JNI method being bound)
methodName:String: the name of the restricted method being called (or the JNI method being bound)
currentClass:Class<?>: the class calling the restricted method (for JNI, this is the same as owner)
jni:boolean: true, if this event is related to a JNI method being bound

findBootstrapClassOrNull	back to summary
public Class<?> findBootstrapClassOrNull(String name) Returns a class loaded by the bootstrap class loader.

findMethod	back to summary
public Method findMethod(Class<?> klass, boolean publicOnly, String name, Class<?>... parameterTypes) Return most specific method that matches name and parameterTypes.

finishInit	back to summary
public void finishInit(StackTraceElement[] stackTrace) Finish initialization of the StackTraceElement objects in a stack trace.

getAllThreads	back to summary
public Thread[] getAllThreads() Returns an array of all platform threads.

getAnnotationType	back to summary
public AnnotationType getAnnotationType(Class<?> klass) Get the AnnotationType instance corresponding to this class. (This method only applies to annotation types.)

getBytesUTF8OrThrow back to summary

getBytesUTF8OrThrow	back to summary
public byte[] getBytesUTF8OrThrow(String s) throws CharacterCodingException Returns the sequence of bytes obtained by encoding the given string in UTF-8. Parameters s:String the string to encode Returns:byte[] the sequence of bytes obtained by encoding the given string in UTF-8 Exceptions CharacterCodingException: For malformed input or unmappable characters NullPointerException: If `s` is null

public byte[] getBytesUTF8OrThrow(String s) throws CharacterCodingException

Returns the sequence of bytes obtained by encoding the given string in UTF-8.

Parameters

s:String: the string to encode

Returns:byte[]

the sequence of bytes obtained by encoding the given string in UTF-8

Exceptions

CharacterCodingException:: For malformed input or unmappable characters
NullPointerException:: If s is null

getCarrierThreadLocal	back to summary
public <T> T getCarrierThreadLocal(CarrierThreadLocal<T> local) Returns the value of the current carrier thread's copy of a thread-local.

getClassFileAccessFlags	back to summary
public int getClassFileAccessFlags(Class<?> klass) Get the int value of the Class's class-file access flags.

getConstantPool	back to summary
public ConstantPool getConstantPool(Class<?> klass) Return the constant pool for a class.

getContinuation	back to summary
public Continuation getContinuation(Thread thread) Returns the innermost mounted continuation

getDeclaredAnnotationMap	back to summary
public Map<Class<? extends Annotation>, Annotation> getDeclaredAnnotationMap(Class<?> klass) Get the declared annotations for a given class, indexed by their types.

getDeclaredPublicMethods	back to summary
public List<Method> getDeclaredPublicMethods(Class<?> klass, String name, Class<?>... parameterTypes) Returns the list of `Method` objects for the declared public methods of this class or interface that have the specified method name and parameter types.

getEnumConstantsShared	back to summary
public <E extends Enum<E>> E[] getEnumConstantsShared(Class<E> klass) Returns the elements of an enum class or null if the Class object does not represent an enum type; the result is uncloned, cached, and shared by all callers.

getLoaderNameID	back to summary
public String getLoaderNameID(ClassLoader loader) Returns '' @ if classloader has a name explicitly set otherwise @

getRawClassAnnotations	back to summary
public byte[] getRawClassAnnotations(Class<?> klass) Get the array of bytes that is the class-file representation of this Class' annotations.

getRawClassTypeAnnotations	back to summary
public byte[] getRawClassTypeAnnotations(Class<?> klass) Get the array of bytes that is the class-file representation of this Class' type annotations.

getRawExecutableTypeAnnotations	back to summary
public byte[] getRawExecutableTypeAnnotations(Executable executable) Get the array of bytes that is the class-file representation of this Executable's type annotations.

getServicesCatalog	back to summary
public ServicesCatalog getServicesCatalog(ModuleLayer layer) Returns the ServicesCatalog for the given Layer.

headStackableScope	back to summary
public StackableScope headStackableScope(Thread thread) Returns the top of the given thread's stackable scope stack.

inflateBytesToChars	back to summary
public void inflateBytesToChars(byte[] src, int srcOff, char[] dst, int dstOff, int len) Inflated copy from `byte[]` to `char[]`, as defined by `StringLatin1.inflate`. Implementation Specification Implementations of this method must perform bounds checks.

initialSystemErr	back to summary
public PrintStream initialSystemErr() Returns the initial value of System.err.

initialSystemIn	back to summary
public InputStream initialSystemIn() Returns the initial `System.in` to determine if it is replaced with `System.setIn(newIn)` method

invokeFinalize	back to summary
public void invokeFinalize(Object o) throws Throwable Invokes the finalize method of the given object.

isFinalMutationEnabled	back to summary
public boolean isFinalMutationEnabled(Module m) Return true if code in a given module is allowed to mutate final instance fields.

isReflectivelyExported	back to summary
public boolean isReflectivelyExported(Module module, String pn, Module other) Returns true if module m reflectively exports a package to other

isReflectivelyOpened	back to summary
public boolean isReflectivelyOpened(Module module, String pn, Module other) Returns true if module m reflectively opens a package to other

isStaticallyExported	back to summary
public boolean isStaticallyExported(Module module, String pn, Module other) Return true if a given module has statically exported the given package to a given other module.

isStaticallyOpened	back to summary
public boolean isStaticallyOpened(Module module, String pn, Module other) Return true if a given module has statically opened the given package to a given other module.

join	back to summary
public String join(String prefix, String suffix, String delimiter, String[] elements, int size) Join strings

layers	back to summary
public Stream<ModuleLayer> layers(ModuleLayer layer) Returns an ordered stream of layers. The first element is the given layer, the remaining elements are its parents, in DFS order.

layers	back to summary
public Stream<ModuleLayer> layers(ClassLoader loader) Returns a stream of the layers that have modules defined to the given class loader.

nativeLibrariesFor	back to summary
public NativeLibraries nativeLibrariesFor(ClassLoader loader) Returns the `NativeLibraries` object associated with the provided class loader. This is used by `SymbolLookup#loaderLookup()`.

nativeThreadID	back to summary
public long nativeThreadID(Thread thread) Returns the native thread ID for the given platform thread or 0 if not set.

newStackWalkerInstance	back to summary
public StackWalker newStackWalkerInstance(Set<StackWalker.Option> options, ContinuationScope contScope, Continuation continuation) Creates a new StackWalker

parkVirtualThread

back to summary

public void parkVirtualThread()

Parks the current virtual thread.

Exceptions

WrongThreadException:: if the current thread is not a virtual thread

parkVirtualThread

back to summary

public void parkVirtualThread(long nanos)

Parks the current virtual thread for up to the given waiting time.

Parameters

nanos:long: the maximum number of nanoseconds to wait

Exceptions

WrongThreadException:: if the current thread is not a virtual thread

protectionDomain	back to summary
public ProtectionDomain protectionDomain(Class<?> c) Get protection domain of the given Class

registerShutdownHook

back to summary

public void registerShutdownHook(int slot, boolean registerShutdownInProgress, Runnable hook)

Registers a shutdown hook. It is expected that this method with registerShutdownInProgress=true is only used to register DeleteOnExitHook since the first file may be added to the delete on exit list by the application shutdown hooks.

Parameters

slot:int: the slot in the shutdown hook array, whose element will be invoked in order during shutdown
registerShutdownInProgress:boolean: true to allow the hook to be registered even if the shutdown is in progress.
hook:Runnable: the hook to be registered

Exceptions

IllegalStateException:: if shutdown is in progress and the slot is not valid to register.

removeCarrierThreadLocal	back to summary
public void removeCarrierThreadLocal(CarrierThreadLocal<?> local) Removes the value of the current carrier thread's copy of a thread-local.

scopedValueBindings	back to summary
public Object scopedValueBindings() Return the current thread's scoped value bindings.

scopedValueCache	back to summary
public Object[] scopedValueCache() Returns the current thread's scoped values cache

setCarrierThreadLocal	back to summary
public <T> void setCarrierThreadLocal(CarrierThreadLocal<T> local, T value) Sets the value of the current carrier thread's copy of a thread-local.

setCause

back to summary

public void setCause(Throwable t, Throwable cause)

Set the cause of Throwable

Parameters

cause:Throwable: set t's cause to new value

setContinuation	back to summary
public void setContinuation(Thread thread, Continuation continuation) Sets the innermost mounted continuation

setHeadStackableScope	back to summary
public void setHeadStackableScope(StackableScope scope) Sets the top of the current thread's stackable scope stack.

setScopedValueCache	back to summary
public void setScopedValueCache(Object[] cache) Sets the current thread's scoped values cache

setThreadNativeID	back to summary
public void setThreadNativeID(long id) Sets the native thread ID for the current platform thread.

start	back to summary
public void start(Thread thread, ThreadContainer container) Starts a thread in the given ThreadContainer.

stringCoder	back to summary
public byte stringCoder(String str) Get the Coder of String, which is used by StringConcatFactory to calculate the initCoder of constants

stringConcatHelper	back to summary
public MethodHandle stringConcatHelper(String name, MethodType methodType) Get a method handle of string concat helper method

stringInitCoder	back to summary
public byte stringInitCoder() Get the string initial coder, When COMPACT_STRINGS is on, it returns 0, and when it is off, it returns 1.

threadContainer	back to summary
public ThreadContainer threadContainer(Thread thread) Returns the ThreadContainer for a thread, may be null.

tryEnableFinalMutation	back to summary
public boolean tryEnableFinalMutation(Module m) Enable code in a given module to mutate final instance fields.

uncheckedGetBytesOrThrow back to summary

public byte[] uncheckedGetBytesOrThrow(String s, Charset cs) throws CharacterCodingException

Returns the sequence of bytes obtained by encoding the given string in the specified Charset.

Warning

This method returns the byte[] backing the provided String, if the input is ASCII. Hence, the returned byte array must not be modified.

Parameters

s:String: the string to encode
cs:Charset: the charset

Returns:byte[]

the sequence of bytes obtained by encoding the given string in the specified Charset

Exceptions

CharacterCodingException:: for malformed input or unmappable characters
NullPointerException:: If s or cs is null

uncheckedGetUTF16Char back to summary

public char uncheckedGetUTF16Char(byte[] bytes, int index)

Get the char at index in a byte[] in internal UTF-16 representation.

Warning

This method does not perform any bound checks.

Parameters

bytes:byte[]: the UTF-16 encoded bytes
index:int: of the char to retrieve, 0 <= index < (bytes.length >> 1)

Returns:char

the char value

uncheckedNewStringOrThrow back to summary

public String uncheckedNewStringOrThrow(byte[] bytes, Charset cs) throws CharacterCodingException

Constructs a new String by decoding the specified byte array using the specified Charset.

WARNING: The caller of this method shall relinquish and transfer the ownership of the byte array to the callee, since the latter will not make a copy.

Parameters

bytes:byte[]: the byte array source
cs:Charset: the Charset

Returns:String

the newly created string

Exceptions

CharacterCodingException:: for malformed or unmappable bytes
NullPointerException:: If bytes or cs is null

uncheckedNewStringWithLatin1Bytes back to summary

public String uncheckedNewStringWithLatin1Bytes(byte[] bytes)

Constructs a new String with the supplied Latin1 bytes.

WARNING: The caller of this method shall relinquish and transfer the ownership of the byte array to the callee, since the latter will not make a copy.

Parameters

bytes:byte[]: the byte array source

Returns:String

the newly created string

uncheckedPutCharUTF16 back to summary

public void uncheckedPutCharUTF16(byte[] bytes, int index, int ch)

Put the ch at index in a byte[] in internal UTF-16 representation.

Warning

This method does not perform any bound checks.

Parameters

bytes:byte[]: the UTF-16 encoded bytes
index:int: of the char to retrieve, 0 <= index < (bytes.length >> 1)

uncheckedStringConcat1

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public Object uncheckedStringConcat1(String[] constants)

Creates helper for string concatenation.

WARNING: The caller of this method shall relinquish and transfer the ownership of the string array to the callee, since the latter will not make a copy.

unparkVirtualThread

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public void unparkVirtualThread(Thread thread)

Re-enables a virtual thread for scheduling. If the thread was parked then it will be unblocked, otherwise its next attempt to park will not block

Parameters

thread:Thread: the virtual thread to unpark

Exceptions

IllegalArgumentException:: if the thread is not a virtual thread
RejectedExecutionException:: if the scheduler cannot accept a task

virtualThreadContinuationScope	back to summary
public ContinuationScope virtualThreadContinuationScope() The ContinuationScope of virtual thread continuations

virtualThreadDefaultScheduler	back to summary
public Executor virtualThreadDefaultScheduler() Returns the virtual thread default scheduler.

public Interface JavaLangAccess

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