Package com.sun.enterprise.loader

Class CurrentBeforeParentClassLoader

java.lang.Object

java.lang.ClassLoader

java.security.SecureClassLoader

java.net.URLClassLoader

com.sun.enterprise.loader.CurrentBeforeParentClassLoader

All Implemented Interfaces:

Closeable, AutoCloseable

Direct Known Subclasses:

ASURLClassLoader

public class CurrentBeforeParentClassLoader
extends URLClassLoader

As the name suggests, loads classes via current class loader ahead of parent class loader by default, classes are loaded from the parent ClassLoader first, thus this class is needed to allow overriding App Server's Modules / JAR files by placing them into <domain_dir>/lib or EAR lib directory

Author:

lprimak

Field Summary

Fields

Modifier and Type	Field	Description
protected boolean	currentBeforeParentEnabled
static String	PARENT_CLASSLOADER_DELEGATE_PROPERTY

Constructor Summary

Constructors

Constructor	Description
CurrentBeforeParentClassLoader(URL[] urls)
CurrentBeforeParentClassLoader(URL[] urls, ClassLoader parent)
CurrentBeforeParentClassLoader(URL[] urls, ClassLoader parent, URLStreamHandlerFactory factory)

Method Summary

Modifier and Type	Method	Description
void	addURL(URL url)
void	disableCurrentBeforeParent()	disable functionality
void	enableCurrentBeforeParent()	enable current-first behavior conditional upon PARENT_CLASSLOADER_DELEGATE_PROPERTY system property being turned on
void	enableCurrentBeforeParentUnconditional()	enable current-first behavior unconditionally, regardless of system property used by application configuration parser, so if application developer uses the config xml element, they presumably want the behavior regardless of the system property settings
protected boolean	isWhiteListed(String className)	support for extreme class loading
protected boolean	isWhitelistEnabled()
protected Class<?>	loadClass(String name, boolean resolve)	Local-first class loading, instead of parent-first as the ClassLoader.loadClass() does

Methods inherited from class java.net.URLClassLoader

close, definePackage, findClass, findResource, findResources, getPermissions, getResourceAsStream, getURLs, newInstance, newInstance

Methods inherited from class java.security.SecureClassLoader

defineClass, defineClass

Methods inherited from class java.lang.ClassLoader

clearAssertionStatus, defineClass, defineClass, defineClass, defineClass, definePackage, findClass, findLibrary, findLoadedClass, findResource, findSystemClass, getClassLoadingLock, getDefinedPackage, getDefinedPackages, getName, getPackage, getPackages, getParent, getPlatformClassLoader, getResource, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, getUnnamedModule, isRegisteredAsParallelCapable, loadClass, registerAsParallelCapable, resolveClass, resources, setClassAssertionStatus, setDefaultAssertionStatus, setPackageAssertionStatus, setSigners

Methods inherited from class java.lang.Object

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

Field Detail

currentBeforeParentEnabled

protected boolean currentBeforeParentEnabled

PARENT_CLASSLOADER_DELEGATE_PROPERTY

public static final String PARENT_CLASSLOADER_DELEGATE_PROPERTY

See Also:

Constant Field Values

Constructor Detail

CurrentBeforeParentClassLoader

public CurrentBeforeParentClassLoader(URL[] urls,
                                      ClassLoader parent)

CurrentBeforeParentClassLoader

public CurrentBeforeParentClassLoader(URL[] urls)

CurrentBeforeParentClassLoader

public CurrentBeforeParentClassLoader(URL[] urls,
                                      ClassLoader parent,
                                      URLStreamHandlerFactory factory)

Method Detail

loadClass

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

Local-first class loading, instead of parent-first as the ClassLoader.loadClass() does

Overrides:

loadClass in class ClassLoader

Parameters:

name -

resolve -

Returns:

Loaded class

Throws:

ClassNotFoundException

isWhiteListed

protected boolean isWhiteListed(String className)

support for extreme class loading

Parameters:

className -

Returns:

true if white-listed

isWhitelistEnabled

protected boolean isWhitelistEnabled()

Returns:

true if extreme classloading is enabled

enableCurrentBeforeParent

public final void enableCurrentBeforeParent()

enable current-first behavior conditional upon PARENT_CLASSLOADER_DELEGATE_PROPERTY system property being turned on

enableCurrentBeforeParentUnconditional

public final void enableCurrentBeforeParentUnconditional()

enable current-first behavior unconditionally, regardless of system property used by application configuration parser, so if application developer uses the config xml element, they presumably want the behavior regardless of the system property settings

disableCurrentBeforeParent

public final void disableCurrentBeforeParent()

disable functionality

addURL

public void addURL(URL url)

Overrides:

addURL in class URLClassLoader