org.apache.openejb
Class ClassLoaderUtil

java.lang.Object
  org.apache.openejb.ClassLoaderUtil

public class ClassLoaderUtil
extends Object

Version:

$Revision: 1230327 $ $Date: 2012-01-11 15:42:20 -0800 (Wed, 11 Jan 2012) $

Constructor Summary

ClassLoaderUtil()

Method Summary

static void	cleanOpenJPACache(ClassLoader classLoader)
static void	clearClassLoaderCaches() Cleans well known class loader leaks in VMs and libraries.
static void	clearSunJarFileFactoryCache(String jarLocation)
static void	clearSunSoftCache(Class clazz, String fieldName) Clears the caches maintained by the SunVM object stream implementation.
static URLClassLoader	createClassLoader(String appId, URL[] urls, ClassLoader parent)
static URLClassLoader	createTempClassLoader(ClassLoader parent)
static URLClassLoader	createTempClassLoader(String appId, URL[] urls, ClassLoader parent)
static void	destroyClassLoader(ClassLoader classLoader) Destroy a classloader as forcefully as possible.
static void	destroyClassLoader(String appId)
boolean	finalizeNativeLibs(ClassLoader cl)
static ClassLoader	getContextClassLoader()
static File	getUrlCachedName(String appId, URL url)
static URL	getUrlKeyCached(String appId, File file)
static boolean	isUrlCached(String appId, URL url)

Methods inherited from class java.lang.Object

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

Constructor Detail

ClassLoaderUtil

public ClassLoaderUtil()

Method Detail

getContextClassLoader

public static ClassLoader getContextClassLoader()

getUrlCachedName

public static File getUrlCachedName(String appId,
                                    URL url)

isUrlCached

public static boolean isUrlCached(String appId,
                                  URL url)

getUrlKeyCached

public static URL getUrlKeyCached(String appId,
                                  File file)

createClassLoader

public static URLClassLoader createClassLoader(String appId,
                                               URL[] urls,
                                               ClassLoader parent)

destroyClassLoader

public static void destroyClassLoader(ClassLoader classLoader)

Destroy a classloader as forcefully as possible.

Parameters:

classLoader - ClassLoader to destroy.

finalizeNativeLibs

public boolean finalizeNativeLibs(ClassLoader cl)

destroyClassLoader

public static void destroyClassLoader(String appId)

createTempClassLoader

public static URLClassLoader createTempClassLoader(ClassLoader parent)

createTempClassLoader

public static URLClassLoader createTempClassLoader(String appId,
                                                   URL[] urls,
                                                   ClassLoader parent)

clearClassLoaderCaches

public static void clearClassLoaderCaches()

Cleans well known class loader leaks in VMs and libraries. There is a lot of bad code out there and this method will clear up the know problems. This method should only be called when the class loader will no longer be used. It this method is called two often it can have a serious impact on preformance.

clearSunJarFileFactoryCache

public static void clearSunJarFileFactoryCache(String jarLocation)

clearSunSoftCache

public static void clearSunSoftCache(Class clazz,
                                     String fieldName)

Clears the caches maintained by the SunVM object stream implementation. This method uses reflection and setAccessable to obtain access to the Sun cache. The cache Class synchronizes upon itself for access to the cache Map. This method completely clears the class loader cache which will impact preformance of object serialization.

Parameters:

clazz - the name of the class containing the cache field

fieldName - the name of the cache field

cleanOpenJPACache

public static void cleanOpenJPACache(ClassLoader classLoader)