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ClassNotFoundException (org.xml.sax.helpers.DefaultHandler) in a module

created by Markus Straub in JBoss AS 7 Development - View the full discussion

Hi,

I am trying to deploy a web application within JBoss AS, where a class in a custom-built library (let's call it mylib.jar) extends org.xml.sax.helpers.DefaultHandler.

As long as mylib.jar is situated in /opt/jboss/standalone/deployments/mywebapp.war/WEB-INF/lib everything works fine.

The problem starts when I want to use mylib.jar as a module, since several of my web applications should use it.

I created a module by putting mylib.jar into /opt/jboss/modules/at/mylib/main. The module.xml looks like this:

<?xml version="1.0" encoding="UTF-8"?>
<module xmlns="urn:jboss:module:1.0" name="at.mylib">
    <resources>
       <resource-root path="mylib.jar"/>
       <!-- Insert resources here -->
    </resources>

    <dependencies>
    </dependencies>
</module>

Then I use the module by removing mylib.jar from WEB-INF and putting the line "Dependencies: at.mylib" into META-INF/MANIFEST.MF

The module is found and loaded, but classloading of the class which extends DefaultHandler fails because DefaultHandler could not be loaded in the first place.

I wonder how this can happen since it is part of Java6. My guess is that rt.jar (which contains DefaultHandler.class) is not loaded.

However I have no good idea how I should fix this. It would be great if somebody could help me to find a solution. Stacktrace and System Specs are below.

Thanks,

Markus

Stacktrace:

11:37:14,628 WARN [org.jboss.modules] (http--127.0.0.1-8080-1) Failed to define class at.trafficstate.provider.its.YTimeseriesReader in Module "at.mylib:main" from local module loader @340d1fa5 (roots: /opt/jboss-as-7.1.0.CR1b/modules): java.lang.LinkageError: Failed to link at/trafficstate/provider/its/YTimeseriesReader (Module "at.mylib:main" from local module loader @340d1fa5 (roots: /opt/jboss-as-7.1.0.CR1b/modules))

at org.jboss.modules.ModuleClassLoader.defineClass(ModuleClassLoader.java:396)

at org.jboss.modules.ModuleClassLoader.loadClassLocal(ModuleClassLoader.java:243)

at org.jboss.modules.ModuleClassLoader$1.loadClassLocal(ModuleClassLoader.java:73)

at org.jboss.modules.Module.loadModuleClass(Module.java:505)

at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:182)

at org.jboss.modules.ConcurrentClassLoader.performLoadClassUnchecked(ConcurrentClassLoader.java:468)

at org.jboss.modules.ConcurrentClassLoader.performLoadClassChecked(ConcurrentClassLoader.java:456)

at org.jboss.modules.ConcurrentClassLoader.performLoadClassChecked(ConcurrentClassLoader.java:423)

at org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:398)

at org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:120)

at at.trafficstate.provider.its.XYZRegionRealTimeProvider.updateData(XYZRegionRealTimeProvider.java:147) [mylib.jar:1.0-b314 2012-Feb-07 11:35:49]

at at.trafficstate.provider.its.XYZRegionRealTimeProvider.<init>(XYZRegionRealTimeProvider.java:50) [mylib.jar:1.0-b314 2012-Feb-07 11:35:49]

at at.trafficstate.provider.factory.XYZRegionRealTimeProviderFactory.createProvider(XYZRegionRealTimeProviderFactory.java:9) [mylib.jar:1.0-b314 2012-Feb-07 11:35:49]

at at.trafficstate.provider.factory.AbstractProviderFactory.createProvider(AbstractProviderFactory.java:22) [mylib.jar:1.0-b314 2012-Feb-07 11:35:49]

at at.trafficstate.TrafficState.addProvider(TrafficState.java:142) [mylib.jar:1.0-b314 2012-Feb-07 11:35:49]

at at.mylib.util.io.mylibContext.getTrafficStateManager(mylibContext.java:474) [mylib.jar:1.0-b314 2012-Feb-07 11:35:49]

at at.mylib.weighter.edge.TravelTimeEdgeWeighter.<init>(TravelTimeEdgeWeighter.java:73) [mylib.jar:1.0-b314 2012-Feb-07 11:35:49]

at at.mylib.weighter.edge.TravelTimeEdgeWeighter.createInstance(TravelTimeEdgeWeighter.java:219) [mylib.jar:1.0-b314 2012-Feb-07 11:35:49]

at at.mylib.weighter.WeighterFactory.getEdgeWeighter(WeighterFactory.java:66) [mylib.jar:1.0-b314 2012-Feb-07 11:35:49]

at at.mylib.routingservice.empora.RoutingManager.getRoute(RoutingManager.java:91) [classes:]

at at.mylib.routingservice.empora.ws.EmporaRoutingService.getRoute(EmporaRoutingService.java:19) [classes:]

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [:1.6.0_26]

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) [:1.6.0_26]

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) [:1.6.0_26]

at java.lang.reflect.Method.invoke(Method.java:597) [:1.6.0_26]

at org.jboss.as.ee.component.ManagedReferenceMethodInterceptorFactory$ManagedReferenceMethodInterceptor.processInvocation(ManagedReferenceMethodInterceptorFactory.java:72) [jboss-as-ee-7.1.0.CR1b.jar:7.1.0.CR1b]