FULL PRODUCT VERSION :
java version " 1.7.0_25 "
Java(TM) SE Runtime Environment (build 1.7.0_25-b16)
Java HotSpot(TM) Client VM (build 23.25-b01, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Windows 7 Ultimate 32 bit

A DESCRIPTION OF THE PROBLEM :
A lot of our customers started experiencing issue similar to http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4665132 after they updated to java 1.7.0_25.

Our application fails to load xml parser, which is included in one of application jar files. Problem is caused by incorrect context class loader in Event Dispatch Thread. (incorrect one is instance of sun.misc.Launcher$AppClassLoader instead of correct one com.sun.jnlp.JNLPClassLoader)




REGRESSION. Last worked in version 6u45


ERROR MESSAGES/STACK TRACES THAT OCCUR :
Chyba p?i parsov?n? XML (Could not load org.apache.xerces.parsers.SAXParser: SAX2 driver class org.apache.xerces.parsers.SAXParser not found: org.apache.xerces.parsers.SAXParser)
<br>file cz/elanor/eman/sgui/forms/opv01/Opv01Comps
cz.elanor.eman.EmanException: Chyba p?i parsov?n? XML (Could not load org.apache.xerces.parsers.SAXParser: SAX2 driver class org.apache.xerces.parsers.SAXParser not found: org.apache.xerces.parsers.SAXParser)
file cz/elanor/eman/sgui/forms/opv01/Opv01Comps
                at cz.elanor.eman.Util.parseXML(SourceFile:390)
                at cz.elanor.eman.Util.parseXML(SourceFile:368)
                at cz.elanor.eman.EmanElement.getXMLRoot(SourceFile:739)
                at cz.elanor.eman.EmanElement.getXMLbyXPath(SourceFile:797)
                at cz.elanor.eman.EmanElement.getXMLofComp(SourceFile:896)
                at cz.elanor.eman.sgui.navig.LeftPanel.createGraphForm(SourceFile:1017)
                at cz.elanor.eman.sgui.navig.LeftPanel.createGraphForm(SourceFile:1027)
                at cz.elanor.eman.sgui.navig.LeftPanel.setForm(SourceFile:759)
                at cz.elanor.eman.sgui.navig.LeftPanel.getForm(SourceFile:655)
                at cz.elanor.eman.sgui.navig.fj.a(SourceFile:448)
                at cz.elanor.eman.sgui.navig.LeftPanel.executeNode(SourceFile:375)
                at cz.elanor.eman.sgui.navig.de.mouseClicked(SourceFile:1107)
                at java.awt.AWTEventMulticaster.mouseClicked(Unknown Source)
                at java.awt.Component.processMouseEvent(Unknown Source)
                at javax.swing.JComponent.processMouseEvent(Unknown Source)
                at java.awt.Component.processEvent(Unknown Source)
                at java.awt.Container.processEvent(Unknown Source)
                at java.awt.Component.dispatchEventImpl(Unknown Source)
                at java.awt.Container.dispatchEventImpl(Unknown Source)
                at java.awt.Component.dispatchEvent(Unknown Source)
                at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
                at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
                at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
                at java.awt.Container.dispatchEventImpl(Unknown Source)
                at java.awt.Window.dispatchEventImpl(Unknown Source)
                at java.awt.Component.dispatchEvent(Unknown Source)
                at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
                at java.awt.EventQueue.access$200(Unknown Source)
                at java.awt.EventQueue$3.run(Unknown Source)
                at java.awt.EventQueue$3.run(Unknown Source)
                at java.security.AccessController.doPrivileged(Native Method)
                at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
                at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
                at java.awt.EventQueue$4.run(Unknown Source)
                at java.awt.EventQueue$4.run(Unknown Source)
                at java.security.AccessController.doPrivileged(Native Method)
                at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
                at java.awt.EventQueue.dispatchEvent(Unknown Source)
                at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
                at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
                at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
                at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
                at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
                at java.awt.EventDispatchThread.run(Unknown Source)
Caused by: org.jdom.JDOMException: Could not load org.apache.xerces.parsers.SAXParser: SAX2 driver class org.apache.xerces.parsers.SAXParser not found: org.apache.xerces.parsers.SAXParser
                at org.jdom.input.SAXBuilder.createParser(SAXBuilder.java:531)
                at org.jdom.input.SAXBuilder.build(SAXBuilder.java:424)
                at cz.elanor.eman.Util.parseXML(SourceFile:375)
                ... 43 more
Caused by: org.xml.sax.SAXException: SAX2 driver class org.apache.xerces.parsers.SAXParser not found
java.lang.ClassNotFoundException: org.apache.xerces.parsers.SAXParser
                at org.xml.sax.helpers.XMLReaderFactory.loadClass(Unknown Source)
                at org.xml.sax.helpers.XMLReaderFactory.createXMLReader(Unknown Source)
                at org.jdom.input.SAXBuilder.createParser(SAXBuilder.java:525)
                ... 45 more
Caused by: java.lang.ClassNotFoundException: org.apache.xerces.parsers.SAXParser
                at java.net.URLClassLoader$1.run(Unknown Source)
                at java.net.URLClassLoader$1.run(Unknown Source)
                at java.security.AccessController.doPrivileged(Native Method)
                at java.net.URLClassLoader.findClass(Unknown Source)
                at java.lang.ClassLoader.loadClass(Unknown Source)
                at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
                at java.lang.ClassLoader.loadClass(Unknown Source)
                at org.xml.sax.helpers.NewInstance.newInstance(Unknown Source)
                ... 48 more

REPRODUCIBILITY :
This bug can be reproduced occasionally.

CUSTOMER SUBMITTED WORKAROUND :
Issue can be worked around by setting correct context class loader, eg. by calling following method from event dispatch thread.

    public static void fixWebStartClassloader() {
    Thread currentThread = Thread.currentThread();
        ClassLoader myCl = Util.class.getClassLoader();
        ClassLoader contextClassLoader = currentThread.getContextClassLoader();
        if (myCl != contextClassLoader) {
            currentThread.setContextClassLoader(myCl);
        }
    }