Re: Classloader clashing and plugins

Sun, 02 Sep 2007 14:39:30 -0700 


On Sep 2, 2007, at 1:52 PM, Jeff Genender wrote:
Welp...that did it ;-) I put a dep on the jasper config and the console 
works...yay!

As always, thanks!  Also...this is probably yet another plugin anomoly
we need to document at some point ;-)
In general depending on a jar that might be used somewhere else is dangerous and might lead to such CCE. The solutions I know of are: 

- be careful and don't do that
- have a classloader per jar (an idea Dain suggested a long time ago, but it requires accurate jar-jar dependency information, better than is in maven poms) - use the osgi classloader (which, without proof to the contrary, I expect to have the same problems with inaccurate metadata as the above) 

thanks
david jencks



Jeff

David Jencks wrote:
I would guess that something has included a jasper jar as a dependency (either by including it in a war lib or with a dependency on the jasper jar in the geronimo repo) rather than using a dependency on the jasper 
config.  If you can debug this CCE and find out what classloader the
jasper class is loaded in that would be very useful.

thanks
david jencks

On Sep 2, 2007, at 7:52 AM, Jeff Genender wrote:


Hi,
I just finished the server plugin for Terracotta which can be found here: 

http://svn.terracotta.org/svn/tc/geronimo-plugin/trunk/geronimo-2.0/

When I install the plugin, everything is fine.  I can start/stop
Terracotta, and works as expected.  However when I stop Geronimo and
restart it and I go to the console, the console starts to spew errors 
and we get errors in a majority of the portlets (as shown below).
Anyone know why a plugin's classes are interfering with other classes? 
Do we have a classloader problem?  Any ideas on what is going on?
Side note - Terracotta needs certain components from Jetty as artifacts 
and I am running the Tomcat version of Geronimo.

Thanks,

Jeff

08:46:05,413 ERROR [normal_jsp]] Servlet.service() for servlet
jsp.WEB_002dINF.view.configmanager.normal_jsp threw exception
java.lang.ClassCastException: org.apache.jasper.runtime.ELContextImpl 
        at
org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate (PageContextImpl.java:920) 

        at
jsp.WEB_002dINF.view.configmanager.normal_jsp._jspx_meth_c_005fif_00 5f0(normal_jsp.java:133) 

        at
jsp.WEB_002dINF.view.configmanager.normal_jsp._jspService (normal_jsp.java:101) 

        at
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service (HttpServlet.java:806) 
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter (ApplicationFilterChain.java:290) 

        at
org.apache.catalina.core.ApplicationFilterChain.doFilter (ApplicationFilterChain.java:206) 

        at
org.apache.catalina.core.ApplicationDispatcher.invoke (ApplicationDispatcher.java:654) 

        at
org.apache.catalina.core.ApplicationDispatcher.doInclude (ApplicationDispatcher.java:557) 

        at
org.apache.catalina.core.ApplicationDispatcher.include (ApplicationDispatcher.java:481) 

        at
org.apache.pluto.core.impl.PortletRequestDispatcherImpl.include (PortletRequestDispatcherImpl.java:65) 

        at
org.apache.geronimo.console.configmanager.ConfigManagerPortlet.doVie w(ConfigManagerPortlet.java:353) 

        at
javax.portlet.GenericPortlet.doDispatch(GenericPortlet.java:247)
at javax.portlet.GenericPortlet.render (GenericPortlet.java:175) 
        at
org.apache.pluto.core.PortletServlet.dispatch(PortletServlet.java: 218) 
        at
org.apache.pluto.core.PortletServlet.doGet(PortletServlet.java:158)
at javax.servlet.http.HttpServlet.service (HttpServlet.java:693) at javax.servlet.http.HttpServlet.service (HttpServlet.java:806) 
        at
org.apache.pluto.core.PortletServlet.service(PortletServlet.java: 153) 
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter (ApplicationFilterChain.java:290) 

        at
org.apache.catalina.core.ApplicationFilterChain.doFilter (ApplicationFilterChain.java:206) 

        at
org.apache.catalina.core.ApplicationDispatcher.invoke (ApplicationDispatcher.java:654) 

        at
org.apache.catalina.core.ApplicationDispatcher.doInclude (ApplicationDispatcher.java:557) 

        at
org.apache.catalina.core.ApplicationDispatcher.include (ApplicationDispatcher.java:481) 

        at
org.apache.pluto.invoker.impl.PortletInvokerImpl.invoke (PortletInvokerImpl.java:120) 

        at
org.apache.pluto.invoker.impl.PortletInvokerImpl.render (PortletInvokerImpl.java:73) 

        at
org.apache.pluto.PortletContainerImpl.renderPortlet (PortletContainerImpl.java:119) 

        at
org.apache.pluto.portalImpl.core.PortletContainerWrapperImpl.renderP ortlet(PortletContainerWrapperImpl.java:70) 

        at
org.apache.pluto.portalImpl.aggregation.PortletFragment.service (PortletFragment.java:168) 

        at
jsp.WEB_002dINF.aggregation.ColumnFragment_jsp._jspService (ColumnFragment_jsp.java:70) 

        at
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service (HttpServlet.java:806) 
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter (ApplicationFilterChain.java:290) 

        at
org.apache.catalina.core.ApplicationFilterChain.doFilter (ApplicationFilterChain.java:206) 

        at
org.apache.catalina.core.ApplicationDispatcher.invoke (ApplicationDispatcher.java:654) 

        at
org.apache.catalina.core.ApplicationDispatcher.doInclude (ApplicationDispatcher.java:557) 

        at
org.apache.catalina.core.ApplicationDispatcher.include (ApplicationDispatcher.java:481) 

        at
org.apache.pluto.portalImpl.aggregation.AbstractFragment.service (AbstractFragment.java:112) 

        at
jsp.WEB_002dINF.aggregation.RowFragment_jsp._jspService (RowFragment_jsp.java:67) 

        at
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service (HttpServlet.java:806) 
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter (ApplicationFilterChain.java:290) 

        at
org.apache.catalina.core.ApplicationFilterChain.doFilter (ApplicationFilterChain.java:206) 

        at
org.apache.catalina.core.ApplicationDispatcher.invoke (ApplicationDispatcher.java:654) 

        at
org.apache.catalina.core.ApplicationDispatcher.doInclude (ApplicationDispatcher.java:557) 

        at
org.apache.catalina.core.ApplicationDispatcher.include (ApplicationDispatcher.java:481) 

        at
org.apache.pluto.portalImpl.aggregation.AbstractFragment.service (AbstractFragment.java:112) 

        at
jsp.WEB_002dINF.aggregation.PageFragment_jsp._jspService (PageFragment_jsp.java:71) 

        at
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service (HttpServlet.java:806) 
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter (ApplicationFilterChain.java:290) 

        at
org.apache.catalina.core.ApplicationFilterChain.doFilter (ApplicationFilterChain.java:206) 

        at
org.apache.catalina.core.ApplicationDispatcher.invoke (ApplicationDispatcher.java:654) 

        at
org.apache.catalina.core.ApplicationDispatcher.doInclude (ApplicationDispatcher.java:557) 

        at
org.apache.catalina.core.ApplicationDispatcher.include (ApplicationDispatcher.java:481) 

        at
org.apache.pluto.portalImpl.aggregation.AbstractFragment.service (AbstractFragment.java:112) 

        at
jsp.WEB_002dINF.aggregation.PageFragment_jsp._jspService (PageFragment_jsp.java:71) 

        at
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service (HttpServlet.java:806) 
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter (ApplicationFilterChain.java:290) 

        at
org.apache.catalina.core.ApplicationFilterChain.doFilter (ApplicationFilterChain.java:206) 

        at
org.apache.catalina.core.ApplicationDispatcher.invoke (ApplicationDispatcher.java:654) 

        at
org.apache.catalina.core.ApplicationDispatcher.doInclude (ApplicationDispatcher.java:557) 

        at
org.apache.catalina.core.ApplicationDispatcher.include (ApplicationDispatcher.java:481) 

        at
org.apache.pluto.portalImpl.aggregation.AbstractFragment.service (AbstractFragment.java:112) 

        at
jsp.WEB_002dINF.aggregation.RootFragment_jsp._jspService (RootFragment_jsp.java:109) 

        at
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service (HttpServlet.java:806) 
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter (ApplicationFilterChain.java:290) 

        at
org.apache.catalina.core.ApplicationFilterChain.doFilter (ApplicationFilterChain.java:206) 

        at
org.apache.catalina.core.ApplicationDispatcher.invoke (ApplicationDispatcher.java:654) 

        at
org.apache.catalina.core.ApplicationDispatcher.doInclude (ApplicationDispatcher.java:557) 

        at
org.apache.catalina.core.ApplicationDispatcher.include (ApplicationDispatcher.java:481) 

        at
org.apache.pluto.portalImpl.aggregation.AbstractFragment.service (AbstractFragment.java:112)
at org.apache.pluto.portalImpl.Servlet.doGet(Servlet.java: 254) at javax.servlet.http.HttpServlet.service (HttpServlet.java:693) at javax.servlet.http.HttpServlet.service (HttpServlet.java:806) 
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter (ApplicationFilterChain.java:290) 

        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.apache.geronimo.tomcat.valve.DefaultSubjectValve.invoke (DefaultSubjectValve.java:56) 

        at
org.apache.catalina.authenticator.AuthenticatorBase.invoke (AuthenticatorBase.java:525) 

        at
org.apache.geronimo.tomcat.GeronimoStandardContext $SystemMethodValve.invoke(GeronimoStandardContext.java:351) 

        at
org.apache.geronimo.tomcat.valve.GeronimoBeforeAfterValve.invoke (GeronimoBeforeAfterValve.java:47) 

        at
org.apache.catalina.core.StandardHostValve.invoke (StandardHostValve.java:128) 

        at
org.apache.catalina.valves.ErrorReportValve.invoke (ErrorReportValve.java:104) 

        at
org.apache.catalina.core.StandardEngineValve.invoke (StandardEngineValve.java:109) 

        at
org.apache.catalina.valves.AccessLogValve.invoke (AccessLogValve.java:563) 
        at
org.apache.catalina.connector.CoyoteAdapter.service (CoyoteAdapter.java:261) 

        at
org.apache.coyote.http11.Http11Processor.process (Http11Processor.java:844) 

        at
org.apache.coyote.http11.Http11Protocol $Http11ConnectionHandler.process(Http11Protocol.java:581) 

        at
org.apache.tomcat.util.net.JIoEndpoint$Worker.run (JIoEndpoint.java:447) 
        at java.lang.Thread.run(Thread.java:613)

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