Hello all.
I have an OSGi based application (using Felix) that is under heavy
development and a few days ago, I started seeing the following exception
showing up in my logs:
java.lang.LinkageError: loader (instance of
org/apache/felix/framework/searchpolicy/ContentClassLoader): attempted
duplicate class definition for name: "org/simplecenter/upnp/av/DIDLParser"
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at
org.apache.felix.framework.searchpolicy.ContentClassLoader.findClass(ContentClassLoader.java:149)
at
org.apache.felix.framework.searchpolicy.ContentClassLoader.loadClassFromModule(ContentClassLoader.java:51)
at
org.apache.felix.framework.searchpolicy.ContentLoaderImpl.getClass(ContentLoaderImpl.java:121)
at
org.apache.felix.framework.searchpolicy.R4Wire.getClass(R4Wire.java:86)
at
org.apache.felix.framework.searchpolicy.R4SearchPolicyCore.searchImports(R4SearchPolicyCore.java:392)
at
org.apache.felix.framework.searchpolicy.R4SearchPolicyCore.findClassOrResource(R4SearchPolicyCore.java:353)
at
org.apache.felix.framework.searchpolicy.R4SearchPolicyCore.findClass(R4SearchPolicyCore.java:136)
at
org.apache.felix.framework.searchpolicy.R4SearchPolicy.findClass(R4SearchPolicy.java:45)
at
org.apache.felix.framework.searchpolicy.ContentClassLoader.loadClass(ContentClassLoader.java:70)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at
org.simplecenter.upnp.av.controlpoint.BaseAVTransportListener.parseMetaData(BaseAVTransportListener.java:87)
at
org.simplecenter.upnp.av.controlpoint.BaseAVTransportListener.change(BaseAVTransportListener.java:78)
at
org.simplecenter.upnp.av.controlpoint.LastChangeListener.parseStates(LastChangeListener.java:98)
at
org.simplecenter.upnp.av.controlpoint.LastChangeListener.parseEvent(LastChangeListener.java:74)
at
org.simplecenter.upnp.av.controlpoint.LastChangeListener.LastChangeChanged(LastChangeListener.java:45)
at
org.simplecenter.upnp.av.renderer.RendererAVTransport.LastChangeChanged(RendererAVTransport.java:48)
at
org.simplecenter.upnp.av.renderer.RendererDeviceInstance$1.sendEvent(RendererDeviceInstance.java:101)
at
org.simplecenter.upnp.av.renderer.LastChangeEventSender.flushEvents(LastChangeEventSender.java:122)
at
org.simplecenter.upnp.av.renderer.LastChangeEventSender.access$300(LastChangeEventSender.java:38)
at
org.simplecenter.upnp.av.renderer.LastChangeEventSender$EventTimer.run(LastChangeEventSender.java:101)
at java.lang.Thread.run(Unknown Source)
I cannot find any duplicate classes in my code and also this problem
doesn't show itself all the times, and yet I haven't been able to find
accurate reproduction steps. Anyhow, if any one has any suggestion as to
what this may mean and how I can debug that, it would be greatly
appreciated.
Many thanks
Ali
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