I've been struggling to get my Struts2+SiteMesh+Guice application
working. I was getting this stack trace with guice 3.0 rc3 and Struts
2.2.1.1:
java.lang.NullPointerException
com.google.inject.struts2.Struts2Factory
$ProvidedInterceptor.intercept(Struts2Factory.java:215)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:
248)
org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:
52)
org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:
485)
org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:
77)
org.apache.struts2.dispatcher.ng.filter.StrutsExecuteFilter.doFilter(StrutsExecuteFilter.java:
88)
com.google.inject.servlet.FilterDefinition.doFilter(FilterDefinition.java:
162)
com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:
58)
com.opensymphony.sitemesh.webapp.SiteMeshFilter.obtainContent(SiteMeshFilter.java:
129)
com.opensymphony.sitemesh.webapp.SiteMeshFilter.doFilter(SiteMeshFilter.java:
77)
com.google.inject.servlet.FilterDefinition.doFilter(FilterDefinition.java:
162)
com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:
58)
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareFilter.doFilter(StrutsPrepareFilter.java:
82)
com.google.inject.servlet.FilterDefinition.doFilter(FilterDefinition.java:
162)
com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:
58)
com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:
118)
com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:113)
I did a little investigation and found that Struts is calling
StrutsFactory.buildInterceptor() AFTER Struts2Factory.createInjector()
is called. This means that the created interceptor never has its
inject() method called, the created interceptor is added to the list
of provided interceptors AFTER the initialize loop in the
buildInterceptor() method.
To fix this, I added the line "providedInterceptor.inject()" to the
end of the buildInterceptor() method and all seems to be working fine.
So, is this a bug, or do I have something configured wrong?
Thanks!
Jeff Butler
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