se.jiderhamn.classloader.leak.prevention

Class ReplaceDOMNormalizerSerializerAbortException

java.lang.Object

se.jiderhamn.classloader.leak.prevention.ReplaceDOMNormalizerSerializerAbortException

All Implemented Interfaces:

ClassLoaderPreMortemCleanUp, PreClassLoaderInitiator

public class ReplaceDOMNormalizerSerializerAbortException
extends Object
implements PreClassLoaderInitiator, ClassLoaderPreMortemCleanUp

As reported at https://github.com/mjiderhamn/classloader-leak-prevention/issues/36, invoking DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument().normalizeDocument(); or Document document = DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument(); DOMImplementationLS implementation = (DOMImplementationLS)document.getImplementation(); implementation.createLSSerializer().writeToString(document); may trigger leaks caused by the static fields com.sun.org.apache.xerces.internal.dom.DOMNormalizer#abort and com.sun.org.apache.xml.internal.serialize.DOMSerializerImpl#abort respectively keeping stacktraces/backtraces that may include references to classes loaded by our web application. Since the Throwable.backtrace itself cannot be accessed via reflection (see http://bugs.java.com/view_bug.do?bug_id=4496456) we need to replace the with new one without any stack trace. This can be done either as a PreClassLoaderInitiator (recommended) or ClassLoaderPreMortemCleanUp.

Author:

Mattias Jiderhamn

Constructor Summary

Constructors

Constructor and Description
ReplaceDOMNormalizerSerializerAbortException()

Method Summary

Modifier and Type	Method and Description
void	cleanUp(ClassLoaderLeakPreventor preventor) Perform cleanup actions needed to make provided ClassLoaderLeakPreventor.classLoader ready for garbage collection.
static RuntimeException	constructRuntimeExceptionWithoutStackTrace(ClassLoaderLeakPreventor preventor, String message, Throwable cause) Construct a new RuntimeException without any stack trace, in order to avoid any references back to this class
void	doOutsideClassLoader(ClassLoaderLeakPreventor preventor) Perform action that needs to be done outside the leak susceptible classloader, i.e. in the system or other parent classloader.
protected void	replaceDOMNormalizerSerializerAbortException(ClassLoaderLeakPreventor preventor)

Methods inherited from class java.lang.Object

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

Constructor Detail

ReplaceDOMNormalizerSerializerAbortException

public ReplaceDOMNormalizerSerializerAbortException()

Method Detail

doOutsideClassLoader

public void doOutsideClassLoader(ClassLoaderLeakPreventor preventor)

Description copied from interface: PreClassLoaderInitiator

Perform action that needs to be done outside the leak susceptible classloader, i.e. in the system or other parent classloader. Assume that the system or parent classloader is the Thread.contextClassLoader of the current thread when method is invoked. Must NOT have modified Thread.contextClassLoader of the current thread when returning.

Specified by:

doOutsideClassLoader in interface PreClassLoaderInitiator

cleanUp

public void cleanUp(ClassLoaderLeakPreventor preventor)

Description copied from interface: ClassLoaderPreMortemCleanUp

Perform cleanup actions needed to make provided ClassLoaderLeakPreventor.classLoader ready for garbage collection.

Specified by:

cleanUp in interface ClassLoaderPreMortemCleanUp

replaceDOMNormalizerSerializerAbortException

protected void replaceDOMNormalizerSerializerAbortException(ClassLoaderLeakPreventor preventor)

constructRuntimeExceptionWithoutStackTrace

public static RuntimeException constructRuntimeExceptionWithoutStackTrace(ClassLoaderLeakPreventor preventor,
                                                                          String message,
                                                                          Throwable cause)

Construct a new RuntimeException without any stack trace, in order to avoid any references back to this class