Hello Brian, 

thanks for your great work!
After playing around with the plugin I found an issue in combination with 
toplink-essentials. Not sure, but it seems related to the classpath scanning.

Trying     
struts.convention.exclude.packages=oracle.toplink.essentials.transaction
the error remains, but with different class:
org.apache.struts2.views.velocity.components.SetDirective

So I think there is some class loading going on in toplink that conflicts with 
yours? If I remove the toplink dependency (2.0-36), everything works fine.
If I remove the convention plugin, it works fine as well..

        Piero


Stacktrace:
12.01.2008 17:21:39 org.apache.catalina.core.StandardContext filterStart
SCHWERWIEGEND: Exception starting filter action2
java.lang.IllegalArgumentException: Could not load class 
[oracle.toplink.essentials.transaction.JTASynchronizationListener]
        at 
org.apache.struts2.convention.ClassClassLoaderResolver.prepare(ClassClassLoaderResolver.java:198)
        at 
org.apache.struts2.convention.ClassClassLoaderResolver.prepare(ClassClassLoaderResolver.java:51)
        at 
org.apache.struts2.convention.AbstractClassLoaderResolver.addIfMatching(AbstractClassLoaderResolver.java:447)
        at 
org.apache.struts2.convention.AbstractClassLoaderResolver.loadResourcesInJar(AbstractClassLoaderResolver.java:401)
        at 
org.apache.struts2.convention.AbstractClassLoaderResolver.findInDirectory(AbstractClassLoaderResolver.java:276)
        at 
org.apache.struts2.convention.AbstractClassLoaderResolver.find(AbstractClassLoaderResolver.java:154)
        at 
org.apache.struts2.convention.AbstractClassLoaderResolver.findByLocators(AbstractClassLoaderResolver.java:243)
        at 
org.apache.struts2.convention.PackageBasedActionConfigBuilder.findActionsUsingPackageLocators(PackageBasedActionConfigBuilder.java:185)
        at 
org.apache.struts2.convention.PackageBasedActionConfigBuilder.buildActionConfigs(PackageBasedActionConfigBuilder.java:165)
        at 
org.apache.struts2.convention.ClasspathConfigurationProvider.loadPackages(ClasspathConfigurationProvider.java:74)
        at 
com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:190)
        at 
com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:55)
        at 
org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:370)
        at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:423)
        at 
org.apache.struts2.dispatcher.FilterDispatcher.init(FilterDispatcher.java:211)
        at 
org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:275)
        at 
org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:397)
        at 
org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:108)
        at 
org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3696)
        at 
org.apache.catalina.core.StandardContext.start(StandardContext.java:4343)
        at 
org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)
        at 
org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)
        at 
org.apache.catalina.core.StandardHost.addChild(StandardHost.java:525)
        at 
org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:626)
        at 
org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:511)
        at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1220)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at 
org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:297)
        at 
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:836)
        at 
com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:761)
        at 
org.apache.catalina.manager.ManagerServlet.check(ManagerServlet.java:1458)
        at 
org.apache.catalina.manager.ManagerServlet.deploy(ManagerServlet.java:820)
        at 
org.apache.catalina.manager.ManagerServlet.doGet(ManagerServlet.java:348)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at 
org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:196)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
        at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
        at 
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:525)
        at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
        at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
        at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)
        at 
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
        at 
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:584)
        at 
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
        at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.NoClassDefFoundError: javax/transaction/Synchronization
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
        at 
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
        at 
org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1817)
        at 
org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:872)
        at 
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1325)
        at 
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1204)
        at 
org.apache.struts2.convention.ClassClassLoaderResolver.prepare(ClassClassLoaderResolver.java:194)
        ... 53 more

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