protected ClassLoader(String name, ClassLoader parent)
Creates a new class loader of the specified name and using the specified parent class loader for delegation.
null
(for the bootstrap class loader) then there is no guarantee that all platform classes are visible.
name
- class loader name; or null
if not named
parent
- the parent class loader
IllegalArgumentException
- if the given name is empty.
SecurityException
- If a security manager exists and its SecurityManager.checkCreateClassLoader()
method doesn't allow creation of a new class loader.
protected ClassLoader(ClassLoader parent)
If there is a security manager, its checkCreateClassLoader
method is invoked. This may result in a security exception.
null
(for the bootstrap class loader) then there is no guarantee that all platform classes are visible.
parent
- The parent class loader
SecurityException
- If a security manager exists and its checkCreateClassLoader
method doesn't allow creation of a new class loader.
protected ClassLoader()
Creates a new class loader using the
ClassLoader
returned by the method
getSystemClassLoader()
as the parent class loader.
If there is a security manager, its checkCreateClassLoader
method is invoked. This may result in a security exception.
SecurityException
- If a security manager exists and its checkCreateClassLoader
method doesn't allow creation of a new class loader.
public String getName()
Returns the name of this class loader or null
if this class loader is not named.
null
if this class loader is not named.
public Class<?> loadClass(String name) throws ClassNotFoundException
name
- The binary name of the class
Class
object
ClassNotFoundException
- If the class was not found
protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException
Loads the class with the specified
binary name. The default implementation of this method searches for classes in the following order:
Invoke findLoadedClass(String)
to check if the class has already been loaded.
Invoke the loadClass
method on the parent class loader. If the parent is null
the class loader built into the virtual machine is used, instead.
Invoke the findClass(String)
method to find the class.
If the class was found using the above steps, and the resolve
flag is true, this method will then invoke the resolveClass(Class)
method on the resulting Class
object.
Subclasses of ClassLoader
are encouraged to override findClass(String)
, rather than this method.
Unless overridden, this method synchronizes on the result of getClassLoadingLock
method during the entire class loading process.
name
- The binary name of the class
resolve
- If true
then resolve the class
Class
object
ClassNotFoundException
- If the class could not be found
protected Object getClassLoadingLock(String className)
Returns the lock object for class loading operations. For backward compatibility, the default implementation of this method behaves as follows. If this ClassLoader object is registered as parallel capable, the method returns a dedicated object associated with the specified class name. Otherwise, the method returns this ClassLoader object.
className
- The name of the to-be-loaded class
NullPointerException
- If registered as parallel capable and className
is null
loadClass(String, boolean)
protected Class<?> findClass(String name) throws ClassNotFoundException
Finds the class with the specified
binary name. This method should be overridden by class loader implementations that follow the delegation model for loading classes, and will be invoked by the
loadClass
method after checking the parent class loader for the requested class.
ClassNotFoundException
.
name
- The binary name of the class
Class
object
ClassNotFoundException
- If the class could not be found
protected Class<?> findClass(String moduleName, String name)
Finds the class with the given
binary namein a module defined to this class loader. Class loader implementations that support the loading from modules should override this method.
null
rather than throwing ClassNotFoundException
if the class could not be found.
findClass(String)
when the moduleName
is null
. It otherwise returns null
.
moduleName
- The module name; or null
to find the class in the unnamed module for this class loader
name
- The binary name of the class
Class
object, or null
if the class could not be found.
@Deprecated(since="1.1") protected final Class<?> defineClass(byte[] b, int off, int len) throws ClassFormatError
Converts an array of bytes into an instance of class
Class
. Before the
Class
can be used it must be resolved. This method is deprecated in favor of the version that takes a
binary nameas its first argument, and is more secure.
b
- The bytes that make up the class data. The bytes in positions off
through off+len-1
should have the format of a valid class file as defined by The Java™ Virtual Machine Specification.
off
- The start offset in b
of the class data
len
- The length of the class data
Class
object that was created from the specified class data
ClassFormatError
- If the data did not contain a valid class
IndexOutOfBoundsException
- If either off
or len
is negative, or if off+len
is greater than b.length
.
SecurityException
- If an attempt is made to add this class to a package that contains classes that were signed by a different set of certificates than this class, or if an attempt is made to define a class in a package with a fully-qualified name that starts with "java.
".
loadClass(String, boolean)
, resolveClass(Class)
protected final Class<?> defineClass(String name, byte[] b, int off, int len) throws ClassFormatError
Converts an array of bytes into an instance of class
Class
. Before the
Class
can be used it must be resolved.
This method assigns a default ProtectionDomain
to the newly defined class. The ProtectionDomain
is effectively granted the same set of permissions returned when Policy.getPolicy().getPermissions(new CodeSource(null, null))
is invoked. The default protection domain is created on the first invocation of defineClass
, and re-used on subsequent invocations.
To assign a specific ProtectionDomain
to the class, use the defineClass
method that takes a ProtectionDomain
as one of its arguments.
This method defines a package in this class loader corresponding to the package of the Class
(if such a package has not already been defined in this class loader). The name of the defined package is derived from the binary name of the class specified by the byte array b
. Other properties of the defined package are as specified by Package
.
name
- The expected binary name of the class, or null
if not known
b
- The bytes that make up the class data. The bytes in positions off
through off+len-1
should have the format of a valid class file as defined by The Java™ Virtual Machine Specification.
off
- The start offset in b
of the class data
len
- The length of the class data
Class
object that was created from the specified class data.
ClassFormatError
- If the data did not contain a valid class
IndexOutOfBoundsException
- If either off
or len
is negative, or if off+len
is greater than b.length
.
SecurityException
- If an attempt is made to add this class to a package that contains classes that were signed by a different set of certificates than this class (which is unsigned), or if name
begins with "java.
".
loadClass(String, boolean)
, resolveClass(Class)
, CodeSource
, SecureClassLoader
protected final Class<?> defineClass(String name, byte[] b, int off, int len, ProtectionDomain protectionDomain) throws ClassFormatError
Converts an array of bytes into an instance of class
Class
, with a given
ProtectionDomain
.
If the given ProtectionDomain
is null
, then a default protection domain will be assigned to the class as specified in the documentation for defineClass(String, byte[], int, int)
. Before the class can be used it must be resolved.
The first class defined in a package determines the exact set of certificates that all subsequent classes defined in that package must contain. The set of certificates for a class is obtained from the CodeSource
within the ProtectionDomain
of the class. Any classes added to that package must contain the same set of certificates or a SecurityException
will be thrown. Note that if name
is null
, this check is not performed. You should always pass in the binary name of the class you are defining as well as the bytes. This ensures that the class you are defining is indeed the class you think it is.
If the specified name
begins with "java.
", it can only be defined by the platform class loader or its ancestors; otherwise SecurityException
will be thrown. If name
is not null
, it must be equal to the binary name of the class specified by the byte array b
, otherwise a NoClassDefFoundError
will be thrown.
This method defines a package in this class loader corresponding to the package of the Class
(if such a package has not already been defined in this class loader). The name of the defined package is derived from the binary name of the class specified by the byte array b
. Other properties of the defined package are as specified by Package
.
name
- The expected binary name of the class, or null
if not known
b
- The bytes that make up the class data. The bytes in positions off
through off+len-1
should have the format of a valid class file as defined by The Java™ Virtual Machine Specification.
off
- The start offset in b
of the class data
len
- The length of the class data
protectionDomain
- The ProtectionDomain
of the class
Class
object created from the data, and ProtectionDomain
.
ClassFormatError
- If the data did not contain a valid class
NoClassDefFoundError
- If name
is not null
and not equal to the binary name of the class specified by b
IndexOutOfBoundsException
- If either off
or len
is negative, or if off+len
is greater than b.length
.
SecurityException
- If an attempt is made to add this class to a package that contains classes that were signed by a different set of certificates than this class, or if name
begins with "java.
" and this class loader is not the platform class loader or its ancestor.
protected final Class<?> defineClass(String name, ByteBuffer b, ProtectionDomain protectionDomain) throws ClassFormatError
Converts a
ByteBuffer
into an instance of class
Class
, with the given
ProtectionDomain
. If the given
ProtectionDomain
is
null
, then a default protection domain will be assigned to the class as specified in the documentation for
defineClass(String, byte[], int, int)
. Before the class can be used it must be resolved.
The rules about the first class defined in a package determining the set of certificates for the package, the restrictions on class names, and the defined package of the class are identical to those specified in the documentation for defineClass(String, byte[], int, int, ProtectionDomain)
.
An invocation of this method of the form cl.defineClass(
name,
bBuffer,
pd)
yields exactly the same result as the statements
...
byte[] temp = new byte[bBuffer.remaining
()];
bBuffer.get
(temp);
return cl.defineClass
(name, temp, 0, temp.length, pd);
name
- The expected binary name. of the class, or null
if not known
b
- The bytes that make up the class data. The bytes from positions b.position()
through b.position() + b.limit() -1
should have the format of a valid class file as defined by The Java™ Virtual Machine Specification.
protectionDomain
- The ProtectionDomain
of the class, or null
.
Class
object created from the data, and ProtectionDomain
.
ClassFormatError
- If the data did not contain a valid class.
NoClassDefFoundError
- If name
is not null
and not equal to the binary name of the class specified by b
SecurityException
- If an attempt is made to add this class to a package that contains classes that were signed by a different set of certificates than this class, or if name
begins with "java.
".
defineClass(String, byte[], int, int, ProtectionDomain)
protected final void resolveClass(Class<?> c)
Links the specified class. This (misleadingly named) method may be used by a class loader to link a class. If the class c
has already been linked, then this method simply returns. Otherwise, the class is linked as described in the "Execution" chapter of The Java™ Language Specification.
c
- The class to link
NullPointerException
- If c
is null
.
defineClass(String, byte[], int, int)
protected final Class<?> findSystemClass(String name) throws ClassNotFoundException
Finds a class with the specified
binary name, loading it if necessary.
This method loads the class through the system class loader (see getSystemClassLoader()
). The Class
object returned might have more than one ClassLoader
associated with it. Subclasses of ClassLoader
need not usually invoke this method, because most class loaders need to override just findClass(String)
.
name
- The binary name of the class
Class
object for the specified name
ClassNotFoundException
- If the class could not be found
ClassLoader(ClassLoader)
, getParent()
protected final Class<?> findLoadedClass(String name)
Returns the class with the given
binary nameif this loader has been recorded by the Java virtual machine as an initiating loader of a class with that
binary name. Otherwise
null
is returned.
name
- The binary name of the class
Class
object, or null
if the class has not been loaded
protected final void setSigners(Class<?> c, Object[] signers)
Sets the signers of a class. This should be invoked after defining a class.
c
- The Class
object
signers
- The signers for the class
protected URL findResource(String moduleName, String name) throws IOException
Returns a URL to a resource in a module defined to this class loader. Class loader implementations that support the loading from modules should override this method.
Class.getResource
, Class.getResourceAsStream
, and Module.getResourceAsStream
methods. It is not subject to the rules for encapsulation specified by Module.getResourceAsStream
.
findResource(String)
when the moduleName
is null
. It otherwise returns null
.
moduleName
- The module name; or null
to find a resource in the unnamed module for this class loader
name
- The resource name
null
if the resource could not be found, a URL could not be constructed to locate the resource, access to the resource is denied by the security manager, or there isn't a module of the given name defined to the class loader.
IOException
- If I/O errors occur
ModuleReader.find(String)
public URL getResource(String name)
Finds the resource with the given name. A resource is some data (images, audio, text, etc) that can be accessed by class code in a way that is independent of the location of the code.
The name of a resource is a '/
'-separated path name that identifies the resource.
Resources in named modules are subject to the encapsulation rules specified by Module.getResourceAsStream
. Additionally, and except for the special case where the resource has a name ending with ".class
", this method will only find resources in packages of named modules when the package is opened
unconditionally (even if the caller of this method is in the same module as the resource).
getResources(String)
method.
null
the path of the class loader built into the virtual machine is searched. If not found, this method will invoke findResource(String)
to find the resource.
name
- The resource name
URL
object for reading the resource; null
if the resource could not be found, a URL
could not be constructed to locate the resource, the resource is in a package that is not opened unconditionally, or access to the resource is denied by the security manager.
NullPointerException
- If name
is null
public Enumeration<URL> getResources(String name) throws IOException
Finds all the resources with the given name. A resource is some data (images, audio, text, etc) that can be accessed by class code in a way that is independent of the location of the code.
The name of a resource is a /
-separated path name that identifies the resource.
Resources in named modules are subject to the encapsulation rules specified by Module.getResourceAsStream
. Additionally, and except for the special case where the resource has a name ending with ".class
", this method will only find resources in packages of named modules when the package is opened
unconditionally (even if the caller of this method is in the same module as the resource).
getResource(String)
method. This should ensure that the first element returned by the Enumeration's nextElement
method is the same resource that the getResource(String)
method would return.
null
the path of the class loader built into the virtual machine is searched. It then invokes findResources(String)
to find the resources with the name in this class loader. It returns an enumeration whose elements are the URLs found by searching the parent class loader followed by the elements found with findResources
.
name
- The resource name
URL
objects for the resource. If no resources could be found, the enumeration will be empty. Resources for which a URL
cannot be constructed, are in package that is not opened unconditionally, or access to the resource is denied by the security manager, are not returned in the enumeration.
IOException
- If I/O errors occur
NullPointerException
- If name
is null
public Stream<URL> resources(String name)
Returns a stream whose elements are the URLs of all the resources with the given name. A resource is some data (images, audio, text, etc) that can be accessed by class code in a way that is independent of the location of the code.
The name of a resource is a /
-separated path name that identifies the resource.
The resources will be located when the returned stream is evaluated. If the evaluation results in an IOException
then the I/O exception is wrapped in an UncheckedIOException
that is then thrown.
Resources in named modules are subject to the encapsulation rules specified by Module.getResourceAsStream
. Additionally, and except for the special case where the resource has a name ending with ".class
", this method will only find resources in packages of named modules when the package is opened
unconditionally (even if the caller of this method is in the same module as the resource).
getResource(String)
method. This should ensure that the first element returned by the stream is the same resource that the getResource(String)
method would return.
getResources
to find all the resources with the given name and returns a stream with the elements in the enumeration as the source.
name
- The resource name
URL
objects. If no resources could be found, the stream will be empty. Resources for which a URL
cannot be constructed, are in a package that is not opened unconditionally, or access to the resource is denied by the security manager, will not be in the stream.
NullPointerException
- If name
is null
protected URL findResource(String name)
For resources in named modules then the method must implement the rules for encapsulation specified in the Module
getResourceAsStream
method. Additionally, it must not find non-".class
" resources in packages of named modules unless the package is opened
unconditionally.
null
.
name
- The resource name
URL
object for reading the resource; null
if the resource could not be found, a URL
could not be constructed to locate the resource, the resource is in a package that is not opened unconditionally, or access to the resource is denied by the security manager.
protected Enumeration<URL> findResources(String name) throws IOException
Returns an enumeration of
URL
objects representing all the resources with the given name. Class loader implementations should override this method.
For resources in named modules then the method must implement the rules for encapsulation specified in the Module
getResourceAsStream
method. Additionally, it must not find non-".class
" resources in packages of named modules unless the package is opened
unconditionally.
name
- The resource name
URL
objects for the resource. If no resources could be found, the enumeration will be empty. Resources for which a URL
cannot be constructed, are in a package that is not opened unconditionally, or access to the resource is denied by the security manager, are not returned in the enumeration.
IOException
- If I/O errors occur
protected static boolean registerAsParallelCapable()
Registers the caller as
parallel capable. The registration succeeds if and only if all of the following conditions are met:
Note that once a class loader is registered as parallel capable, there is no way to change it back.
true
if the caller is successfully registered as parallel capable and false
if otherwise.
isRegisteredAsParallelCapable()
public final boolean isRegisteredAsParallelCapable()
Returns
true
if this class loader is registered as
parallel capable, otherwise
false
.
true
if this class loader is parallel capable, otherwise false
.
registerAsParallelCapable()
public static URL getSystemResource(String name)
Find a resource of the specified name from the search path used to load classes. This method locates the resource through the system class loader (see
getSystemClassLoader()
).
Resources in named modules are subject to the encapsulation rules specified by Module.getResourceAsStream
. Additionally, and except for the special case where the resource has a name ending with ".class
", this method will only find resources in packages of named modules when the package is opened
unconditionally.
name
- The resource name
URL
to the resource; null
if the resource could not be found, a URL could not be constructed to locate the resource, the resource is in a package that is not opened unconditionally or access to the resource is denied by the security manager.
public static Enumeration<URL> getSystemResources(String name) throws IOException
Finds all resources of the specified name from the search path used to load classes. The resources thus found are returned as an
Enumeration
of
URL
objects.
The search order is described in the documentation for getSystemResource(String)
.
Resources in named modules are subject to the encapsulation rules specified by Module.getResourceAsStream
. Additionally, and except for the special case where the resource has a name ending with ".class
", this method will only find resources in packages of named modules when the package is opened
unconditionally.
name
- The resource name
URL
objects for the resource. If no resources could be found, the enumeration will be empty. Resources for which a URL
cannot be constructed, are in a package that is not opened unconditionally, or access to the resource is denied by the security manager, are not returned in the enumeration.
IOException
- If I/O errors occur
public InputStream getResourceAsStream(String name)
Returns an input stream for reading the specified resource.
The search order is described in the documentation for getResource(String)
.
Resources in named modules are subject to the encapsulation rules specified by Module.getResourceAsStream
. Additionally, and except for the special case where the resource has a name ending with ".class
", this method will only find resources in packages of named modules when the package is opened
unconditionally.
name
- The resource name
null
if the resource could not be found, the resource is in a package that is not opened unconditionally, or access to the resource is denied by the security manager.
NullPointerException
- If name
is null
public static InputStream getSystemResourceAsStream(String name)
Open for reading, a resource of the specified name from the search path used to load classes. This method locates the resource through the system class loader (see
getSystemClassLoader()
).
Resources in named modules are subject to the encapsulation rules specified by Module.getResourceAsStream
. Additionally, and except for the special case where the resource has a name ending with ".class
", this method will only find resources in packages of named modules when the package is opened
unconditionally.
name
- The resource name
null
if the resource could not be found, the resource is in a package that is not opened unconditionally, or access to the resource is denied by the security manager.
public final ClassLoader getParent()
Returns the parent class loader for delegation. Some implementations may use null
to represent the bootstrap class loader. This method will return null
in such implementations if this class loader's parent is the bootstrap class loader.
ClassLoader
SecurityException
- If a security manager is present, and the caller's class loader is not null
and is not an ancestor of this class loader, and the caller does not have the RuntimePermission
("getClassLoader")
public final Module getUnnamedModule()
Returns the unnamed Module
for this class loader.
Module.isNamed()
public static ClassLoader getPlatformClassLoader()
Returns the platform class loader for delegation. All
platform classesare visible to the platform class loader.
"platform"
.
ClassLoader
.
SecurityException
- If a security manager is present, and the caller's class loader is not null
, and the caller's class loader is not the same as or an ancestor of the platform class loader, and the caller does not have the RuntimePermission
("getClassLoader")
public static ClassLoader getSystemClassLoader()
Returns the system class loader for delegation. This is the default delegation parent for new
ClassLoader
instances, and is typically the class loader used to start the application.
This method is first invoked early in the runtime's startup sequence, at which point it creates the system class loader. This class loader will be the context class loader for the main application thread (for example, the thread that invokes the main
method of the main class).
The default system class loader is an implementation-dependent instance of this class.
If the system property "java.system.class.loader
" is defined when this method is first invoked then the value of that property is taken to be the name of a class that will be returned as the system class loader. The class is loaded using the default system class loader and must define a public constructor that takes a single parameter of type ClassLoader
which is used as the delegation parent. An instance is then created using this constructor with the default system class loader as the parameter. The resulting class loader is defined to be the system class loader. During construction, the class loader should take great care to avoid calling getSystemClassLoader()
. If circular initialization of the system class loader is detected then an unspecified error or exception is thrown.
The name of the built-in system class loader is "app"
. The class path used by the built-in system class loader is determined by the system property "java.class.path
" during early initialization of the VM. If the system property is not defined, or its value is an empty string, then there is no class path when the initial module is a module on the application module path, i.e. a named module. If the initial module is not on the application module path then the class path defaults to the current working directory.
ClassLoader
for delegation
SecurityException
- If a security manager is present, and the caller's class loader is not null
and is not the same as or an ancestor of the system class loader, and the caller does not have the RuntimePermission
("getClassLoader")
IllegalStateException
- If invoked recursively during the construction of the class loader specified by the "java.system.class.loader
" property.
Error
- If the system property "java.system.class.loader
" is defined but the named class could not be loaded, the provider class does not define the required constructor, or an exception is thrown by that constructor when it is invoked. The underlying cause of the error can be retrieved via the Throwable.getCause()
method.
protected Package definePackage(String name, String specTitle, String specVersion, String specVendor, String implTitle, String implVersion, String implVendor, URL sealBase)
Defines a package by
namein this
ClassLoader
.
Package names must be unique within a class loader and cannot be redefined or changed once created.
If a class loader wishes to define a package with specific properties, such as version information, then the class loader should call this definePackage
method before calling defineClass
. Otherwise, the defineClass
method will define a package in this class loader corresponding to the package of the newly defined class; the properties of this defined package are specified by Package
.
URL
of the JAR file is typically used as the sealBase
. If classes of package 'p'
defined by this class loader are loaded from multiple JARs, the Package
object may contain different information depending on the first class of package 'p'
defined and which JAR's manifest is read first to explicitly define package 'p'
.
It is strongly recommended that a class loader does not call this method to explicitly define packages in named modules; instead, the package will be automatically defined when a class is being defined. If it is desirable to define Package
explicitly, it should ensure that all packages in a named module are defined with the properties specified by Package
. Otherwise, some Package
objects in a named module may be for example sealed with different seal base.
name
- The package name
specTitle
- The specification title
specVersion
- The specification version
specVendor
- The specification vendor
implTitle
- The implementation title
implVersion
- The implementation version
implVendor
- The implementation vendor
sealBase
- If not null
, then this package is sealed with respect to the given code source URL
object. Otherwise, the package is not sealed.
Package
object
NullPointerException
- if name
is null
.
IllegalArgumentException
- if a package of the given name
is already defined by this class loader
public final Package getDefinedPackage(String name)
Returns a
Package
of the given
namethat has been defined by this class loader.
name
- The package name
Package
of the given name defined by this class loader, or null
if not found
NullPointerException
- if name
is null
.
public final Package[] getDefinedPackages()
Returns all of the Package
s defined by this class loader. The returned array has no duplicated Package
s of the same name.
Set
or Stream
for consistency with the existing getPackages()
method.
Package
objects defined by this class loader; or an zero length array if no package has been defined by this class loader.
@Deprecated(since="9") protected Package getPackage(String name)
Finds a package by
namein this class loader and its ancestors.
If this class loader defines a Package
of the given name, the Package
is returned. Otherwise, the ancestors of this class loader are searched recursively (parent by parent) for a Package
of the given name.
platform class loader
may delegate to the application class loader but the application class loader is not its ancestor. When invoked on the platform class loader, this method will not find packages defined to the application class loader.
name
- The package name
Package
corresponding to the given name defined by this class loader or its ancestors, or null
if not found.
NullPointerException
- if name
is null
.
protected Package[] getPackages()
Returns all of the Package
s defined by this class loader and its ancestors. The returned array may contain more than one Package
object of the same package name, each defined by a different class loader in the class loader hierarchy.
platform class loader
may delegate to the application class loader. In other words, packages in modules defined to the application class loader may be visible to the platform class loader. On the other hand, the application class loader is not its ancestor and hence when invoked on the platform class loader, this method will not return any packages defined to the application class loader.
Package
objects defined by this class loader and its ancestors
protected String findLibrary(String libname)
Returns the absolute path name of a native library. The VM invokes this method to locate the native libraries that belong to classes loaded with this class loader. If this method returns null
, the VM searches the library along the path specified as the "java.library.path
" property.
libname
- The library name
System.loadLibrary(String)
, System.mapLibraryName(String)
public void setDefaultAssertionStatus(boolean enabled)
enabled
- true
if classes loaded by this class loader will henceforth have assertions enabled by default, false
if they will have assertions disabled by default.
public void setPackageAssertionStatus(String packageName, boolean enabled)
Sets the package default assertion status for the named package. The package default assertion status determines the assertion status for classes initialized in the future that belong to the named package or any of its "subpackages".
A subpackage of a package named p is any package whose name begins with "p.
". For example, javax.swing.text
is a subpackage of javax.swing
, and both java.util
and java.lang.reflect
are subpackages of java
.
In the event that multiple package defaults apply to a given class, the package default pertaining to the most specific package takes precedence over the others. For example, if javax.lang
and javax.lang.reflect
both have package defaults associated with them, the latter package default applies to classes in javax.lang.reflect
.
Package defaults take precedence over the class loader's default assertion status, and may be overridden on a per-class basis by invoking setClassAssertionStatus(String, boolean)
.
packageName
- The name of the package whose package default assertion status is to be set. A null
value indicates the unnamed package that is "current" (see section 7.4.2 of The Java™ Language Specification.)
enabled
- true
if classes loaded by this classloader and belonging to the named package or any of its subpackages will have assertions enabled by default, false
if they will have assertions disabled by default.
public void setClassAssertionStatus(String className, boolean enabled)
If the named class is not a top-level class, this invocation will have no effect on the actual assertion status of any class.
className
- The fully qualified class name of the top-level class whose assertion status is to be set.
enabled
- true
if the named class is to have assertions enabled when (and if) it is initialized, false
if the class is to have assertions disabled.
public void clearAssertionStatus()
Sets the default assertion status for this class loader to false
and discards any package defaults or class assertion status settings associated with the class loader. This method is provided so that class loaders can be made to ignore any command line or persistent assertion status settings and "start with a clean slate."
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