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()


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