[richfaces-issues] [JBoss JIRA] Created: (RF-5248) NullPointerException in HeaderResourcesRendererBase

[Michael Heinen (JIRA)]

NullPointerException in HeaderResourcesRendererBase
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                 Key: RF-5248
                 URL: https://jira.jboss.org/jira/browse/RF-5248
             Project: RichFaces
          Issue Type: Bug
    Affects Versions: 3.1.5
         Environment: richfaces 3.1.5
myFaces 1.1.5
tomahawk 1.1.7
tomcat 5.5.25
jdk 1.6.0_10
            Reporter: Michael Heinen


I am facing sometimes a NullPointerException in class HeaderResourcesRendererBase in method getUrisSet.
This occurs if two users post a from nearly parallel (no ajax request)
I can sometimes reproduce it if I open two IE instances and submit two forms very fast from each IE, one after another.
Note that the processing of the action takes some time (nearly 20 seconds due to some initializations).

StackTrace:
java.lang.NullPointerException
	at org.ajax4jsf.renderkit.HeaderResourcesRendererBase.getUrisSet(HeaderResourcesRendererBase.java:101)
	at org.ajax4jsf.renderkit.HeaderResourcesRendererBase.getHeaderScripts(HeaderResourcesRendererBase.java:54)
	at org.ajax4jsf.context.ViewResources.processHeadResources(ViewResources.java:61)
	at org.ajax4jsf.context.ViewResources.processHeadResources(ViewResources.java:94)
	at org.ajax4jsf.context.ViewResources.processHeadResources(ViewResources.java:94)
	at org.ajax4jsf.context.ViewResources.processHeadResources(ViewResources.java:94)
	at org.ajax4jsf.context.ViewResources.processHeadResources(ViewResources.java:94)
	at org.ajax4jsf.context.ViewResources.processHeadResources(ViewResources.java:94)
	at org.ajax4jsf.context.ViewResources.processHeadResources(ViewResources.java:94)
	at org.ajax4jsf.context.ViewResources.processHeadResources(ViewResources.java:94)
	at org.ajax4jsf.context.ViewResources.collect(ViewResources.java:41)
	at org.ajax4jsf.context.AjaxContextImpl.processHeadResources(AjaxContextImpl.java:398)
	at org.ajax4jsf.application.AjaxViewHandler.renderView(AjaxViewHandler.java:245)
	at org.apache.myfaces.lifecycle.RenderResponseExecutor.execute(RenderResponseExecutor.java:41)
	at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:132)
	at org.apache.myfaces.custom.ppr.PPRLifecycleWrapper.render(PPRLifecycleWrapper.java:84)
	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:140)
	at com.recommind.litigation.client.web.servlets.FacesServletWrapper.service(FacesServletWrapper.java:136)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
	at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:141)
	at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:281)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
	at org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:344)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
	at com.recommind.litigation.client.web.filters.LoginFilter.doFilter(LoginFilter.java:237)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
	at com.recommind.litigation.client.web.filters.EncodingFilter.doFilter(EncodingFilter.java:49)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
	at com.recommind.litigation.client.web.filters.TimerFilter.doFilter(TimerFilter.java:65)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:874)
	at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
	at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
	at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
	at java.lang.Thread.run(Unknown Source)
	
I added a Java Exception Breakpoint to suspend if a NullPointerException occurs.
The vars are initialized with following values (stopped at line 101):

for (int i = 0; i < resources.length; i++) {
	InternetResource resource = resources[i];
	uris.add(resource.getUri(context, component));   /***** line 101 *****/
}

component=AjaxPoll
resources = InternetResource[1]  
resources[1] = AjaScript 
i=0
resource= null !!!

resources[i] contains a AjaScript instance but resource is null!
So there must be an issue with multithreading, or?

Is this a duplicate of RF-1555 ? If so is there any way to fix this in the 3.1.X branch ?

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