java.lang
Class ClassLoader

java.lang.Object
  |
  +--java.lang.ClassLoader

Direct Known Subclasses:

SecureClassLoader

public abstract class ClassLoader

extends Object

Unsafe:

Field Summary

private static sun.misc.URLClassPath	bootstrapClassPath
(package private) Map	classAssertionStatus
private Vector	classes
private boolean	defaultAssertionStatus
private ProtectionDomain	defaultDomain
private Set	domains
private static RuntimePermission	getClassLoaderPerm
private boolean	initialized
private static Vector	loadedLibraryNames
private Vector	nativeLibraries
private static Stack	nativeLibraryContext
(package private) java.security.cert.Certificate[]	nocerts
private Hashtable	package2certs
private Map	packageAssertionStatus
private HashMap	packages
private ClassLoader	parent
private static ClassLoader	scl
private static boolean	sclSet
private static String[]	sys_paths
private static Vector	systemNativeLibraries
private static String[]	usr_paths

Constructor Summary

protected	ClassLoader() Creates a new class loader using the ClassLoader returned by the method getSystemClassLoader() as the parent class loader.
protected	ClassLoader(ClassLoader parent) Creates a new class loader using the specified parent class loader for delegation.

Method Summary

(package private) void	addClass(Class c)
private void	check()
private void	checkCerts(String name, CodeSource cs)
private void	checkPackageAccess(Class cls, ProtectionDomain pd)
void	clearAssertionStatus() Suppressed: 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.
private boolean	compareCerts(java.security.cert.Certificate[] pcerts, java.security.cert.Certificate[] certs) check to make sure the certs for the new class (certs) are the same as the certs for the first class inserted in the package (pcerts)
protected Class	defineClass(byte[] b, int off, int len) Deprecated. Replaced by defineClass(java.lang.String, byte[], int, int)
protected Class	defineClass(String name, byte[] b, int off, int len) Converts an array of bytes into an instance of class Class.
protected Class	defineClass(String name, byte[] b, int off, int len, ProtectionDomain protectionDomain) Converts an array of bytes into an instance of class Class, with an optional ProtectionDomain.
private Class	defineClass0(String name, byte[] b, int off, int len, ProtectionDomain pd)
protected Package	definePackage(String name, String specTitle, String specVersion, String specVendor, String implTitle, String implVersion, String implVendor, URL sealBase) Defines a package by name in this ClassLoader.
(package private) boolean	desiredAssertionStatus(String className) Returns the assertion status that would be assigned to the specified class if it were to be initialized at the time this method is invoked.
private Class	findBootstrapClass(String name)
private Class	findBootstrapClass0(String name)
protected Class	findClass(String name) Finds the specified class.
protected String	findLibrary(String libname) Returns the absolute path name of a native library.
protected Class	findLoadedClass(String name) Finds the class with the given name if it had been previously loaded through this class loader.
(package private) static long	findNative(ClassLoader loader, String name)
protected URL	findResource(String name) Finds the resource with the given name.
protected Enumeration	findResources(String name) Returns an Enumeration of URLs representing all the resources with the given name.
protected Class	findSystemClass(String name) Finds a class with the specified name, loading it if necessary.
(package private) static sun.misc.URLClassPath	getBootstrapClassPath()
private static URL	getBootstrapResource(String name) Find resources from the VM's built-in classloader.
private static Enumeration	getBootstrapResources(String name) Find resources from the VM's built-in classloader.
(package private) static ClassLoader	getCallerClassLoader()
private ProtectionDomain	getDefaultDomain()
(package private) static RuntimePermission	getGetClassLoaderPerm()
protected Package	getPackage(String name) Returns a Package that has been defined by this class loader or any of its ancestors.
protected Package[]	getPackages() Returns all of the Packages defined by this class loader and its ancestors.
ClassLoader	getParent() Enabled: Returns the parent class loader for delegation.
URL	getResource(String name) Enabled: Finds the resource with the given name.
InputStream	getResourceAsStream(String name) Enabled: Returns an input stream for reading the specified resource.
Enumeration	getResources(String name) Enabled: Finds all the resources with the given name.
static ClassLoader	getSystemClassLoader() Enabled: Returns the system class loader for delegation.
static URL	getSystemResource(String name) Enabled: Find a resource of the specified name from the search path used to load classes.
static InputStream	getSystemResourceAsStream(String name) Enabled: Open for reading, a resource of the specified name from the search path used to load classes.
static Enumeration	getSystemResources(String name) Enabled: Finds all resources of the specified name from the search path used to load classes.
private void	initializeJavaAssertionMaps()
private static String[]	initializePath(String propname)
private static void	initSystemClassLoader()
(package private) boolean	isAncestor(ClassLoader cl)
Class	loadClass(String name) Enabled: Loads the class with the specified name.
protected Class	loadClass(String name, boolean resolve) Loads the class with the specified name.
private Class	loadClassInternal(String name)
(package private) static void	loadLibrary(Class fromClass, String name, boolean isAbsolute)
private static boolean	loadLibrary0(Class fromClass, File file)
private static void	registerNatives()
protected void	resolveClass(Class c) Links the specified class.
private void	resolveClass0(Class c)
private static AssertionStatusDirectives	retrieveDirectives()
void	setClassAssertionStatus(String className, boolean enabled) Suppressed: Sets the desired assertion status for the named top-level class in this class loader and any nested classes contained therein.
void	setDefaultAssertionStatus(boolean enabled) Suppressed: Sets the default assertion status for this class loader.
void	setPackageAssertionStatus(String packageName, boolean enabled) Suppressed: Sets the package default assertion status for the named package.
protected void	setSigners(Class c, Object[] signers) Sets the signers of a class.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

initialized

private boolean initialized

parent

private ClassLoader parent

package2certs

private Hashtable package2certs

nocerts

java.security.cert.Certificate[] nocerts

classes

private Vector classes

domains

private Set domains

packages

private HashMap packages

bootstrapClassPath

private static sun.misc.URLClassPath bootstrapClassPath

scl

private static ClassLoader scl

sclSet

private static boolean sclSet

getClassLoaderPerm

private static RuntimePermission getClassLoaderPerm

defaultDomain

private ProtectionDomain defaultDomain

loadedLibraryNames

private static Vector loadedLibraryNames

systemNativeLibraries

private static Vector systemNativeLibraries

nativeLibraries

private Vector nativeLibraries

nativeLibraryContext

private static Stack nativeLibraryContext

usr_paths

private static String[] usr_paths

sys_paths

private static String[] sys_paths

defaultAssertionStatus

private boolean defaultAssertionStatus

packageAssertionStatus

private Map packageAssertionStatus

classAssertionStatus

Map classAssertionStatus

Constructor Detail

ClassLoader

protected ClassLoader(ClassLoader parent)

Creates a new class loader using the specified parent class loader for delegation.

If there is a security manager, its checkCreateClassLoader method is called. This may result in a security exception.

Parameters:

parent - the parent class loader

Throws:

SecurityException - if a security manager exists and its checkCreateClassLoader method doesn't allow creation of a new class loader.

Since:

1.2

See Also:

java.lang.SecurityException, java.lang.SecurityManager#checkCreateClassLoader()

ClassLoader

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 called. This may result in a security exception.

Throws:

SecurityException - if a security manager exists and its checkCreateClassLoader method doesn't allow creation of a new class loader.

See Also:

java.lang.SecurityException, java.lang.SecurityManager#checkCreateClassLoader()

Method Detail

registerNatives

private static void registerNatives()

addClass

void addClass(Class c)

loadClass

public Class loadClass(String name)
                throws ClassNotFoundException

Enabled: Loads the class with the specified name. This method searches for classes in the same manner as the loadClass(String, boolean) method. It is called by the Java virtual machine to resolve class references. Calling this method is equivalent to calling loadClass(name, false).

Parameters:

name - the name of the class

Returns:

the resulting Class object

ClassNotFoundException

loadClass

protected Class loadClass(String name,
                          boolean resolve)
                   throws ClassNotFoundException

Loads the class with the specified name. The default implementation of this method searches for classes in the following order:

1. Call findLoadedClass(String) to check if the class has already been loaded.

2. Call the loadClass method on the parent class loader. If the parent is null the class loader built-in to the virtual machine is used, instead.

3. Call 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 call the resolveClass(Class) method on the resulting class object.

From the Java 2 SDK, v1.2, subclasses of ClassLoader are encouraged to override findClass(String), rather than this method.

Parameters:

name - the name of the class

resolve - if true then resolve the class

Returns:

the resulting Class object

ClassNotFoundException

loadClassInternal

private Class loadClassInternal(String name)
                         throws ClassNotFoundException

ClassNotFoundException

checkPackageAccess

private void checkPackageAccess(Class cls,
                                ProtectionDomain pd)

findClass

protected Class findClass(String name)
                   throws ClassNotFoundException

Finds the specified class. This method should be overridden by class loader implementations that follow the new delegation model for loading classes, and will be called by the loadClass method after checking the parent class loader for the requested class. The default implementation throws ClassNotFoundException.

Parameters:

name - the name of the class

Returns:

the resulting Class object

ClassNotFoundException

Since:

1.2

defineClass

protected final Class defineClass(byte[] b,
                                  int off,
                                  int len)
                           throws ClassFormatError

Deprecated. Replaced by defineClass(java.lang.String, byte[], int, int)

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 the class name as its first argument, and is more secure.

Parameters:

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

Returns:

the Class object that was created from the specified class data

ClassFormatError

See Also:

loadClass(java.lang.String, boolean), resolveClass(java.lang.Class)

defineClass

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 contains the set of permissions granted when a call to Policy.getPolicy().getPermissions() is made with a code source of null,null. The default domain is created on the first invocation of defineClass, and re-used on subsequent calls.

To assign a specific ProtectionDomain to the class, use the defineClass method that takes a ProtectionDomain as one of its arguments.

Parameters:

name - the expected name of the class, or null if not known, using '.' and not '/' as the separator and without a trailing ".class" suffix.

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

Returns:

the Class object that was created from the specified class data

ClassFormatError

Since:

JDK1.1

See Also:

loadClass(java.lang.String, boolean), resolveClass(java.lang.Class), java.security.ProtectionDomain, java.security.Policy, java.security.CodeSource, java.security.SecureClassLoader

defineClass

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 an optional ProtectionDomain. If the domain is null, then a default 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 the name argument is null, this check is not performed. You should always pass in the 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.

The specified class name cannot begin with "java.", since all classes in the java.* packages can only be defined by the bootstrap class loader. If the name parameter is not null, it must be equal to the name of the class specified by the byte array b, otherwise a ClassFormatError is raised.

Parameters:

name - the expected name of the class, or null if not known, using '.' and not '/' as the separator and without a trailing ".class" suffix.

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

Returns:

the Class object created from the data, and optional ProtectionDomain.

ClassFormatError

checkCerts

private void checkCerts(String name,
                        CodeSource cs)

compareCerts

private boolean compareCerts(java.security.cert.Certificate[] pcerts,
                             java.security.cert.Certificate[] certs)

check to make sure the certs for the new class (certs) are the same as the certs for the first class inserted in the package (pcerts)

resolveClass

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.

Parameters:

c - the class to link

See Also:

java.lang.ClassLoader#defineClass(java.lang.String,byte[],int,int)

findSystemClass

protected final Class findSystemClass(String name)
                               throws ClassNotFoundException

Finds a class with the specified name, loading it if necessary.

Prior to the Java 2 SDK, this method loads a class from the local file system in a platform-dependent manner, and returns a class object that has no associated class loader.

Since the Java 2 SDK v1.2, this method loads the class through the system class loader(see getSystemClassLoader()). Class objects returned might have ClassLoaders associated with them. Subclasses of ClassLoader need not usually call this method, because most class loaders need to override just findClass(String).

Parameters:

name - the name of the class that is to be found

Returns:

the Class object for the specified name

ClassNotFoundException

See Also:

ClassLoader(ClassLoader), getParent()

getParent

public final ClassLoader getParent()

Enabled: 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.

If a security manager is present, and the caller's class loader is not null and is not an ancestor of this class loader, then this method calls the security manager's checkPermission method with a RuntimePermission("getClassLoader") permission to ensure it's ok to access the parent class loader. If not, a SecurityException will be thrown.

Returns:

the parent ClassLoader

Throws:

SecurityException - if a security manager exists and its checkPermission method doesn't allow access to this class loader's parent class loader.

Since:

1.2

See Also:

SecurityManager.checkPermission(java.security.Permission), java.lang.RuntimePermission

setSigners

protected final void setSigners(Class c,
                                Object[] signers)

Sets the signers of a class. This should be called after defining a class.

Parameters:

c - the Class object

signers - the signers for the class

Since:

JDK1.1

findBootstrapClass0

private Class findBootstrapClass0(String name)
                           throws ClassNotFoundException

ClassNotFoundException

defineClass0

private Class defineClass0(String name,
                           byte[] b,
                           int off,
                           int len,
                           ProtectionDomain pd)

resolveClass0

private void resolveClass0(Class c)

findBootstrapClass

private Class findBootstrapClass(String name)
                          throws ClassNotFoundException

ClassNotFoundException

check

private void check()

findLoadedClass

protected final Class findLoadedClass(String name)

Finds the class with the given name if it had been previously loaded through this class loader.

Parameters:

name - the class name

Returns:

the Class object, or null if the class has not been loaded

Since:

JDK1.1

getResource

public URL getResource(String name)

Enabled: 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.

This method will first search the parent class loader for the resource; if the parent is null the path of the class loader built-in to the virtual machine is searched. That failing, this method will call findResource to find the resource.

Parameters:

name - resource name

Returns:

a URL for reading the resource, or null if the resource could not be found or the caller doesn't have adequate privileges to get the resource.

Since:

JDK1.1

See Also:

findResource(String)

getResources

public final Enumeration getResources(String name)
                               throws IOException

Enabled: 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.

The search order is described in the documentation for getResource(String).

Parameters:

name - resource name

Returns:

an enumeration of URL to the resource. If no resources could be found, the enumeration will be empty. Resources that the doesn't have access to will not be in the enumeration.

Throws:

IOException - if I/O errors occur

Since:

1.2

See Also:

getResource(java.lang.String), findResources(java.lang.String)

findResources

protected Enumeration findResources(String name)
                             throws IOException

Returns an Enumeration of URLs representing all the resources with the given name. Class loader implementations should override this method to specify where to load resources from.

Parameters:

name - the resource name

Returns:

an Enumeration of URLs for the resources

Throws:

IOException - if I/O errors occur

Since:

1.2

findResource

protected URL findResource(String name)

Finds the resource with the given name. Class loader implementations should override this method to specify where to find resources.

Parameters:

name - the resource name

Returns:

a URL for reading the resource, or null if the resource could not be found

Since:

1.2

getSystemResource

public static URL getSystemResource(String name)

Enabled: Find a resource of the specified name from the search path used to load classes.

In JDK1.1, the search path used is that of the virtual machine's built-in class loader.

Since the Java 2 SDK v1.2, this method locates the resource through the system class loader (see getSystemClassLoader()).

Parameters:

name - the resource name

Returns:

a URL for reading the resource, or null if the resource could not be found

Since:

JDK1.1

getBootstrapResource

private static URL getBootstrapResource(String name)

Find resources from the VM's built-in classloader.

getSystemResources

public static Enumeration getSystemResources(String name)
                                      throws IOException

Enabled: 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).

Parameters:

name - the resource name

Returns:

an enumeration of resource URLs

Throws:

IOException - if I/O errors occur

Since:

1.2

getBootstrapResources

private static Enumeration getBootstrapResources(String name)
                                          throws IOException

Find resources from the VM's built-in classloader.

IOException

getBootstrapClassPath

static sun.misc.URLClassPath getBootstrapClassPath()

getResourceAsStream

public InputStream getResourceAsStream(String name)

Enabled: Returns an input stream for reading the specified resource. The search order is described in the documentation for getResource(String).

Parameters:

name - the resource name

Returns:

an input stream for reading the resource, or null if the resource could not be found

Since:

JDK1.1

getSystemResourceAsStream

public static InputStream getSystemResourceAsStream(String name)

Enabled: Open for reading, a resource of the specified name from the search path used to load classes.

The search order is described in the documentation for getSystemResource(String).

Parameters:

name - the resource name

Returns:

an input stream for reading the resource, or null if the resource could not be found

Since:

JDK1.1

getSystemClassLoader

public static ClassLoader getSystemClassLoader()

Enabled: 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 and sets it as the context class loader of the invoking Thread.

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.

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 system class loader, then this method calls the security manager's checkPermission method with a RuntimePermission("getClassLoader") permission to ensure it's ok to access the system class loader. If not, a SecurityException will be thrown.

Returns:

the system ClassLoader for delegation, or null if none

Throws:

SecurityException - if a security manager exists and its checkPermission method doesn't allow access to the system class loader.

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.

See Also:

SecurityManager.checkPermission(java.security.Permission), java.lang.RuntimePermission

initSystemClassLoader

private static void initSystemClassLoader()

isAncestor

boolean isAncestor(ClassLoader cl)

getCallerClassLoader

static ClassLoader getCallerClassLoader()

getGetClassLoaderPerm

static RuntimePermission getGetClassLoaderPerm()

definePackage

protected Package definePackage(String name,
                                String specTitle,
                                String specVersion,
                                String specVendor,
                                String implTitle,
                                String implVersion,
                                String implVendor,
                                URL sealBase)
                         throws IllegalArgumentException

Defines a package by name in this ClassLoader. This allows class loaders to define the packages for their classes. Packages must be created before the class is defined, and package names must be unique within a class loader and cannot be redefined or changed once created.

Parameters:

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. Otherwise, the package is not sealed.

Returns:

the newly defined Package object

IllegalArgumentException

Since:

1.2

getPackage

protected Package getPackage(String name)

Returns a Package that has been defined by this class loader or any of its ancestors.

Parameters:

name - the package name

Returns:

the Package corresponding to the given name, or null if not found

Since:

1.2

getPackages

protected Package[] getPackages()

Returns all of the Packages defined by this class loader and its ancestors.

Returns:

the array of Package objects defined by this ClassLoader

Since:

1.2

findLibrary

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.

Parameters:

libname - the library name

Returns:

the absolute path of the native library

Since:

1.2

See Also:

java.lang.System#loadLibrary(java.lang.String), java.lang.System#mapLibraryName(java.lang.String)

getDefaultDomain

private ProtectionDomain getDefaultDomain()

initializePath

private static String[] initializePath(String propname)

loadLibrary

static void loadLibrary(Class fromClass,
                        String name,
                        boolean isAbsolute)

loadLibrary0

private static boolean loadLibrary0(Class fromClass,
                                    File file)

findNative

static long findNative(ClassLoader loader,
                       String name)

setDefaultAssertionStatus

public void setDefaultAssertionStatus(boolean enabled)

Suppressed: Sets the default assertion status for this class loader. This setting determines whether classes loaded by this class loader and initialized in the future will have assertions enabled or disabled by default. This setting may be overridden on a per-package or per-class basis by invoking setPackageAssertionStatus(String,boolean) or setClassAssertionStatus(String,boolean).

Parameters:

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.

Since:

1.4

setPackageAssertionStatus

public void setPackageAssertionStatus(String packageName,
                                      boolean enabled)

Suppressed: 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).

Parameters:

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" (JLS 7.4.2).

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.

Since:

1.4

setClassAssertionStatus

public void setClassAssertionStatus(String className,
                                    boolean enabled)

Suppressed: Sets the desired assertion status for the named top-level class in this class loader and any nested classes contained therein. This setting takes precedence over the class loader's default assertion status, and over any applicable per-package default. This method has no effect if the named class has already been initialized. (Once a class is initialized, its assertion status cannot change.)

If the named class is not a top-level class, this call will have no effect on the actual assertion status of any class, and its return value is undefined.

Parameters:

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.

Since:

1.4

clearAssertionStatus

public void clearAssertionStatus()

Suppressed: 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 call 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."

Since:

1.4

desiredAssertionStatus

boolean desiredAssertionStatus(String className)

Returns the assertion status that would be assigned to the specified class if it were to be initialized at the time this method is invoked. If the named class has had its assertion status set, the most recent setting will be returned; otherwise, if any package default assertion status pertains to this class, the most recent setting for the most specific pertinent package default assertion status is returned; otherwise, this class loader's default assertion status is returned.

Parameters:

className - the fully qualified class name of the class whose desired assertion status is being queried.

Returns:

the desired assertion status of the specified class.

Since:

1.4

See Also:

setClassAssertionStatus(String,boolean), setPackageAssertionStatus(String,boolean), setDefaultAssertionStatus(boolean)

initializeJavaAssertionMaps

private void initializeJavaAssertionMaps()

retrieveDirectives

private static AssertionStatusDirectives retrieveDirectives()