Servlet conflict in war deployment (Seam and GWT)

[taccart.thierry.accart.name]

Hi

We're trying to include in a SEAM EAR project a part of google web toolkit (I think this problem would append on any servlet included in war part of ear)
The war deployment fails, raising a java.lang.ClassCastException: org.jboss.seam.servlet.SeamFilter (see stacktrace hereafter).

I think we've a conflict in url-patterns between the GWTServlet and the SeamFilter : in the web.xml they are defined as

<servlet>
     <servlet-name>GWTServlet</servlet-name>
     <servlet-class>
          org.myCompany.calendarApp.gwt.server.ServiceImpl
     </servlet-class>
</servlet>

<servlet-mapping>
     <servlet-name>GWTServlet</servlet-name>
     <url-pattern>
          /Calendar/org.myCompany.calendarApp.gwt.CalendarApp/GWTServlet
     </url-pattern>
</servlet-mapping>


<filter>
    <filter-name>Seam Filter</filter-name>
    <filter-class>org.jboss.seam.servlet.SeamFilter</filter-class>
</filter>

<filter-mapping>
    <filter-name>Seam Filter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

Has anyone ever encountered similar problem (and found a solution) ?

I guess we could have a workaround by externalizing the GWT servlet in its own war, but it's not elegant, and I'd prefer to find a cleaner solution... all ideas are welcomed :)

Rgds
Thierry

The stacktrace :

11:15:28 ERROR (main:) [org.apache.catalina.core.ContainerBase.[jboss.web].[localhost].[/myapp/agendaviewer]] Exception starting filter Seam Filter
java.lang.ClassCastException: org.jboss.seam.servlet.SeamFilter
     at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:255)
     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:3722)
     at org.apache.catalina.core.StandardContext.start(StandardContext.java:4367)
     at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:790)
     at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:770)
     at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:553)
     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:585)
     at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:296)
     at org.jboss.mx.server.RawDynamicInvoker.invoke(RawDynamicInvoker.java:164)
     at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
     at org.apache.catalina.core.StandardContext.init(StandardContext.java:5312)
     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:585)
     at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:296)
     at org.jboss.mx.server.RawDynamicInvoker.invoke(RawDynamicInvoker.java:164)
     at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
     at org.jboss.web.tomcat.service.TomcatDeployer.performDeployInternal(TomcatDeployer.java:301)
     at org.jboss.web.tomcat.service.TomcatDeployer.performDeploy(TomcatDeployer.java:104)
     at org.jboss.web.AbstractWebDeployer.start(AbstractWebDeployer.java:375)
     at org.jboss.web.WebModule.startModule(WebModule.java:83)
     at org.jboss.web.WebModule.startService(WebModule.java:61)
     at org.jboss.system.ServiceMBeanSupport.jbossInternalStart(ServiceMBeanSupport.java:289)
     at org.jboss.system.ServiceMBeanSupport.jbossInternalLifecycle(ServiceMBeanSupport.java:245)
     at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
     at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
     at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)
     at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
     at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
     at org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController.java:978)
     at $Proxy0.start(Unknown Source)
     at org.jboss.system.ServiceController.start(ServiceController.java:417)
     at sun.reflect.GeneratedMethodAccessor10.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
     at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
     at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)
     at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
     at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
     at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210)
     at $Proxy44.start(Unknown Source)
     at org.jboss.web.AbstractWebContainer.start(AbstractWebContainer.java:466)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
     at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
     at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:133)
     at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
     at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:142)
     at org.jboss.mx.interceptor.DynamicInterceptor.invoke(DynamicInterceptor.java:97)
     at org.jboss.system.InterceptorServiceMBeanSupport.invokeNext(InterceptorServiceMBeanSupport.java:238)
     at org.jboss.wsf.container.jboss42.DeployerInterceptor.start(DeployerInterceptor.java:87)
     at org.jboss.deployment.SubDeployerInterceptorSupport$XMBeanInterceptor.start(SubDeployerInterceptorSupport.java:188)
     at org.jboss.deployment.SubDeployerInterceptor.invoke(SubDeployerInterceptor.java:95)
     at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
     at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
     at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
     at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210)
     at $Proxy45.start(Unknown Source)
     at org.jboss.deployment.MainDeployer.start(MainDeployer.java:1025)
     at org.jboss.deployment.MainDeployer.start(MainDeployer.java:1015)
     at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:819)
     at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:782)
     at sun.reflect.GeneratedMethodAccessor24.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
     at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
     at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:133)
     at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
     at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:142)
     at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
     at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
     at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
     at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210)
     at $Proxy9.deploy(Unknown Source)
     at org.jboss.deployment.scanner.URLDeploymentScanner.deploy(URLDeploymentScanner.java:421)
     at org.jboss.deployment.scanner.URLDeploymentScanner.scan(URLDeploymentScanner.java:634)
     at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.doScan(AbstractDeploymentScanner.java:263)
     at org.jboss.deployment.scanner.AbstractDeploymentScanner.startService(AbstractDeploymentScanner.java:336)
     at org.jboss.system.ServiceMBeanSupport.jbossInternalStart(ServiceMBeanSupport.java:289)
     at org.jboss.system.ServiceMBeanSupport.jbossInternalLifecycle(ServiceMBeanSupport.java:245)
     at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
     at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
     at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)
     at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
     at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
     at org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController.java:978)
     at $Proxy0.start(Unknown Source)
     at org.jboss.system.ServiceController.start(ServiceController.java:417)
     at sun.reflect.GeneratedMethodAccessor10.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
     at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
     at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)
     at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
     at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
     at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210)
     at $Proxy4.start(Unknown Source)
     at org.jboss.deployment.SARDeployer.start(SARDeployer.java:302)
     at org.jboss.deployment.MainDeployer.start(MainDeployer.java:1025)
     at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:819)
     at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:782)
     at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:766)
     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:585)
     at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
     at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
     at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:133)
     at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
     at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:142)
     at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
     at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
     at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
     at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210)
     at $Proxy5.deploy(Unknown Source)
     at org.jboss.system.server.ServerImpl.doStart(ServerImpl.java:482)
     at org.jboss.system.server.ServerImpl.start(ServerImpl.java:362)
     at org.jboss.Main.boot(Main.java:200)
     at org.jboss.Main$1.run(Main.java:508)
     at java.lang.Thread.run(Thread.java:595)
11:15:28 ERROR (main:) [org.apache.catalina.core.StandardContext] Error filterStart

[blabno]

This is class loading problem. Show your ear structure (in which directories each library resides). I bet you have two jboss-seam.jar archives packaged one in ear and one in war.

[taccart.thierry.accart.name]

Hi Bernard

unfortunately, the war contains only jboss-seam- debug, ioc, mail, pdf, remoting and ui jars, and the ear contains only one jboss-seam.jar :)

by the way, here's the debug log of catalina.core (if it can help)

[ContainerBase] Add child StandardWrapper[Seam Resource Servlet] StandardEngine[jboss.web].StandardHost[localhost].StandardContext[/myapp/agendaviewer]
[ContainerBase] Add child StandardWrapper[Faces Servlet] StandardEngine[jboss.web].StandardHost[localhost].StandardContext[/myapp/agendaviewer]
[StandardContext] Configuring application event listeners
[ContainerBase.[jboss.web].[localhost].[/myapp/agendaviewer]]  Configuring event listener class 'org.jboss.web.tomcat.security.SecurityFlushSessionListener'
[ContainerBase.[jboss.web].[localhost].[/myapp/agendaviewer]]  Configuring event listener class 'org.jboss.web.jsf.integration.config.JBossJSFConfigureListener'
[ContainerBase.[jboss.web].[localhost].[/myapp/agendaviewer]]  Configuring event listener class 'com.sun.faces.application.WebappLifecycleListener'
[ContainerBase.[jboss.web].[localhost].[/myapp/agendaviewer]]  Configuring event listener class 'org.jboss.seam.servlet.SeamListener'
[ContainerBase.[jboss.web].[localhost].[/myapp/agendaviewer]] Sending application start events
[ContainerBase.[jboss.web].[localhost].[/myapp/agendaviewer]] Starting filters
[ContainerBase.[jboss.web].[localhost].[/myapp/agendaviewer]]  Starting filter 'CommonHeadersFilter'
[ContainerBase.[jboss.web].[localhost].[/myapp/agendaviewer]]  Starting filter 'Seam Filter'
[ContainerBase.[jboss.web].[localhost].[/myapp/agendaviewer]] Exception starting filter Seam Filter

[blabno]

The problem is that SeamFilter is loaded with different classloader then one of Catalina classes that loads that filter. javax.servlet.Filter resides in servlet-api.jar. Isn't it by any chance in your ear ? It may also appear in two locations in your server and gets loaded by different classloaders.

[blabno]

Similar problem (SEAMAlfrescoAndWebDav) was solved. It was caused by presence of some jar containing javax.* classes in WEB-INF/lib. Show us the full list of libs included in your archive.

[taccart.thierry.accart.name]

Hi

I'm going to investigate on the javax.* in war, but to answer you request,
the war  contains  the folling jars in WEB-INF/lib :
commons-beanutils.jar
commons-digester.jar
commons-fileupload-1.2.jar
gwt-dnd-2.0.7.jar
gwt-user.jar
ical4j-1.0-beta4.jar
jboss-seam-debug.jar
jboss-seam-ioc.jar
jboss-seam-mail.jar
jboss-seam-pdf.jar
jboss-seam-remoting.jar
jboss-seam-ui.jar
jsf-facelets.jar
richfaces-impl.jar
richfaces-ui.jar

The ear contains
antlr-runtime.jar
drools-compiler.ja
drools-core.jar
jboss-el.jar
jboss-seam.jar
jbpm-jpdl.jar
mvel14.jar
richfaces-api.jar

The ejb contains only 2 jars :
gwt-servlet.jar
ical4j-1.0-beta4.jar

In addition, we have sources in EJB project and in WAR(gwt stuff)

I've a similar project that does not include gwt-servlet.jar
ical4j-1.0-beta4.jar nor any custom servlet (GWTServlet) or custom classes in the war, that's working fine.

I'll post the solution... if I find any:-/

[taccart.thierry.accart.name]

Bernard : you're great ! :-)

having a look in gwt-user.jar, guess what I found  ? 
javax.servlet.*  !!!

It's strange how better the deployment works after I removed those classes from gwt-user.jar :-)

Thanks for your help :)

[fxtentacle]

Thank you for explaining this problem so detailed!

I was very irritated when a new gwt-user.jar broke my seam app and this thread helped me fix it in like 5 minutes :)

[snoa]

Hi everybody, please expose your ideas right here:
http://gwtseam.blogspot.com/

forget the spanish.