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Exception thrown when invoking service

From: <glassfish_at_javadesktop.org>
Date: Tue, 10 Apr 2007 11:41:14 PDT

I've been using Glassfishv1 b48 rather successfully, but now all of a sudden i get the following error message

[i]StandardWrapperValve[VMFMessagingService]: Servlet.service() for servlet VMFMessagingService threw exception
java.lang.NullPointerException
        at com.sun.enterprise.admin.wsmgmt.agent.GlobalMessageListenerImpl.preProcessRequest(GlobalMessageListenerImpl.java:78)
        at com.sun.enterprise.webservice.monitoring.WebServiceEngineImpl.preProcessRequest(WebServiceEngineImpl.java:254)
        at com.sun.enterprise.webservice.JAXWSServlet.doPost(JAXWSServlet.java:142)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
        at org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:397)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:278)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:536)
        at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:240)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:179)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566)
        at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:73)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:182)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566)
        at com.sun.enterprise.web.VirtualServerPipeline.invoke(VirtualServerPipeline.java:120)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:939)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:137)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:536)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:939)
        at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:231)
        at com.sun.enterprise.web.connector.grizzly.ProcessorTask.invokeAdapter(ProcessorTask.java:667)
        at com.sun.enterprise.web.connector.grizzly.ProcessorTask.processNonBlocked(ProcessorTask.java:574)
        at com.sun.enterprise.web.connector.grizzly.ProcessorTask.process(ProcessorTask.java:844)
        at com.sun.enterprise.web.connector.grizzly.ReadTask.executeProcessorTask(ReadTask.java:287)
        at com.sun.enterprise.web.connector.grizzly.ReadTask.doTask(ReadTask.java:212)
        at com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:252)
        at com.sun.enterprise.web.connector.grizzly.WorkerThread.run(WorkerThread.java:75)
[/i]

This exception is hard to figure out since none of it occurs in the code I have written. Can anyone tellme what this exception means?
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