NPE in Payload2XML.convert for console "instance data"

[gubespam]

Has anyone seen this before? It happens sometimes, sometimes not, when I click "Instance Data" in the console.

org.jboss.resteasy.spi.UnhandledException: java.lang.NullPointerException
     org.jboss.resteasy.core.SynchronousDispatcher.handleApplicationException(SynchronousDispatcher.java:319)
     org.jboss.resteasy.core.SynchronousDispatcher.handleException(SynchronousDispatcher.java:230)
     org.jboss.resteasy.core.SynchronousDispatcher.handleInvokerException(SynchronousDispatcher.java:206)
     org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:360)
     org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:173)
     org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:93)
     org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:68)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
     org.jboss.bpm.console.server.util.GWTJsonFilter.doFilter(GWTJsonFilter.java:59)
     org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)

root cause

java.lang.NullPointerException
     org.jboss.bpm.console.server.util.Payload2XML.convert(Payload2XML.java:57)
     org.jboss.bpm.console.server.ProcessMgmtFacade.getInstanceData(ProcessMgmtFacade.java:209)
     sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     java.lang.reflect.Method.invoke(Method.java:597)
     org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:117)
     org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:260)
     org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:232)
     org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:166)
     org.jboss.resteasy.core.DispatcherUtilities.getJaxrsResponse(DispatcherUtilities.java:142)
     org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:356)
     org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:173)
     org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:93)
     org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:68)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
     org.jboss.bpm.console.server.util.GWTJsonFilter.doFilter(GWTJsonFilter.java:59)
     org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)

[rebody]

Hi M M,

Looks like a bug of BPM-console.

[gubespam]

Any idea what might be causing it? Is there some place I get the source code for the console to try to diagnose what's wrong?

[swiderski.maciej]

The exception indicates that variable (or one of the variables) has value null. The error occurs when console tries to convert it from Java representation to xml, to be more precisely when getting class object from the variable value.

[swiderski.maciej]

You can get source of BPM console here: http://anonsvn.jboss.org/repos/soag/bpm-console

Please follow the guide lines located here to get started quite fast: http://community.jboss.org/wiki/bpmconsole

HTH

Maciej

[markroy]

Does your process instance include a process variable that is a Hibernate object? I experienced this same problem when my Hibernate object included lazy-loaded references to other objects.