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Home » Eclipse Projects » EclipseLink » java.lang.LinkageError: loader (instance of sun/misc/Launcher$AppClassLoader): attempted duplicate
java.lang.LinkageError: loader (instance of sun/misc/Launcher$AppClassLoader): attempted duplicate [message #762520] Thu, 08 December 2011 03:40 Go to previous message
Tom Eugelink is currently offline Tom Eugelink
Messages: 801
Registered: July 2009
Senior Member
I'm in the process of migrating to Java 7. In this process I came across the problem that in Eclipselink 2.0.2 the included ASM has a problem on Java7. So I decided to upgrade to Eclipselink 2.3.0.

After replacing just that eclipselink jar, my project stopped working:

java.vm.version=21.0-b17
java.lang.LinkageError: loader (instance of sun/misc/Launcher$AppClassLoader): attempted duplicate class definition for name: "nl/reinders/bm/Article2Articlecat"
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:791)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
at nl.reinders.bm.generated.Article.<clinit>(Article.java:117)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:186)
at nl.reinders.bm.BM.<clinit>(BM.java:73)
at nl.reinders.Reinders.setupStatic(Reinders.java:310)
at nl.reinders.Reinders.startJpaScreenSwing(Reinders.java:3944)
at nl.reinders.Reinders.access$9(Reinders.java:3914)
at nl.reinders.Reinders$28.run(Reinders.java:3906)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:241)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:705)
at java.awt.EventQueue.access$000(EventQueue.java:101)
at java.awt.EventQueue$3.run(EventQueue.java:666)
at java.awt.EventQueue$3.run(EventQueue.java:664)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:675)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:90)

Googling the error does not give much results. Any suggestions what is different here? I'm rolling back to Eclipselink 2.0.2 and Java 6 for now.

Tom

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