We're running JBoss AS 4.3.0.GA_CP02 + Seam 2.1.0.GA and today I tried to install the Jboss Profiler 2.0 Beta 3 to do some profiling.

I followed the readme.txt carefully, putting jboss-profiler.jar, jboss-profiler.properties, jboss-profiler-plugins.jar and javassist.jar in my jboss-as/bin directory and jboss-profiler.sar into my jboss-as/server/default/deploy directory (this is on my desktop development machine).

Initially, I've not changed any of the configuration (jboss-profiler.properties or jboss-profiler.sar/META-INF/jboss-service.xml).

I started up JBoss-AS without our own applications deployed and it seems to start cleanly. The first two lines in the log are:

JBoss Profiler 2.0.Beta3 (Sun Microsystems Inc. 1.6.0_03)
JBoss Profiler depends on external communication module

I assume the second line is reporting a satisfied dependency and not an unsatisfied one!

Later on, I see:

2008-11-24 17:18:25,375 INFO [org.jboss.profiler.as.Profiler] JBoss Profiler: ProfilerMBean started
2008-11-24 17:18:25,375 INFO [org.jboss.profiler.as.Communicator] JBoss Profiler: Communicator for JBoss Profiler 2.0.Beta3
2008-11-24 17:18:25,406 INFO [org.jboss.profiler.as.Communicator] JBoss Profiler: Socket=0.0.0.0:5400
2008-11-24 17:18:34,031 INFO [org.jboss.wsf.stack.jbws.NativeServerConfig] JBoss Web Services - Native
2008-11-24 17:18:34,031 INFO [org.jboss.wsf.stack.jbws.NativeServerConfig] jbossws-native-2.0.1.SP2_CP03 (build=200808011456)
2008-11-24 17:18:38,578 INFO [org.apache.catalina.core.AprLifecycleListener] Loaded Apache Tomcat Native library 1.1.13.
2008-11-24 17:18:38,578 INFO [org.apache.catalina.core.AprLifecycleListener] APR capabilities: IPv6 [true], sendfile [true], accept filters [false], random [true].
2008-11-24 17:18:40,765 INFO [org.apache.coyote.http11.Http11AprProtocol] Initializing Coyote HTTP/1.1 on http-0.0.0.0-8090
2008-11-24 17:18:40,781 INFO [org.apache.coyote.http11.Http11AprProtocol] Initializing Coyote HTTP/1.1 on http-0.0.0.0-8443

However, as soon as I try and view my jmx-console, I get a NPE:

2008-11-24 17:20:01,921 ERROR [org.apache.catalina.core.ContainerBase] Servlet.service() for servlet jsp threw exception
java.lang.NullPointerException
 at org.jboss.profiler.agent.ProfilerThreadImpl.allocation(ProfilerThreadImpl.java:226)
 at org.apache.jsp.index_jsp.<init>(index_jsp.java:7)
 at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
 at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
 at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
 at java.lang.reflect.Constructor.newInstance(Unknown Source)
 at java.lang.Class.newInstance0(Unknown Source)
 at java.lang.Class.newInstance(Unknown Source)
 at org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:145)
 at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:323)
 at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
 at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
 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:230)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
 at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:182)
 at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:525)
 at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
 at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:241)
 at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:853)
 at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:579)
 at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1513)
 at java.lang.Thread.run(Unknown Source)

When I debug and stop at ProfilerThreadImpl.java, line 226, I find that activeFrame (and hence fi) is null and this apparently causes the NPE. Why is this happening? Is there something wrong with my configuration, or is there something in the newer version of JBoss (4.3) that's causing this?

Cheers,

Rob Hills
Waikiki, Western Australia