extend widgets in repeater yields NPE
-------------------------------------

         Key: COCOON-1823
         URL: http://issues.apache.org/jira/browse/COCOON-1823
     Project: Cocoon
        Type: Bug

  Components: Blocks: Forms  
    Reporter: Bill Bruyn


I have a widget defined in a library and am able to use it inside a repeater as 
you'd expect:

    <fd:repeater id="subjects">
      <fd:widgets>
        <fd:expand id="subj:name" /> 
      </fd:widgets>
    </fd:repeater>

But when I try to extend the group instead of expand it, I'm greeted with a NPE 
[1].  

    <fd:repeater id="subjects">
      <fd:widgets>
        <fd:group id="fullName" extends="subj:name" state="output"/> 
      </fd:widgets>
    </fd:repeater>

If I move the widget out of the repeater, all is well (but that isn't what I 
want).  Anyone?


TIA,

Bill

[1] java.lang.NullPointerException
        at 
org.apache.cocoon.forms.formmodel.AbstractContainerDefinitionBuilder.setupContainer(AbstractContainerDefinitionBuilder.java:52)
        at 
org.apache.cocoon.forms.formmodel.RepeaterDefinitionBuilder.buildWidgetDefinition(RepeaterDefinitionBuilder.java:55)
        at 
org.apache.cocoon.forms.formmodel.AbstractWidgetDefinitionBuilder.buildWidgetDefinition(AbstractWidgetDefinitionBuilder.java:65)
        at 
org.apache.cocoon.forms.formmodel.AbstractWidgetDefinitionBuilder.buildAnotherWidgetDefinition(AbstractWidgetDefinitionBuilder.java:160)
        at 
org.apache.cocoon.forms.formmodel.AbstractContainerDefinitionBuilder.setupContainer(AbstractContainerDefinitionBuilder.java:59)
        at 
org.apache.cocoon.forms.formmodel.FormDefinitionBuilder.buildWidgetDefinition(FormDefinitionBuilder.java:54)
        at 
org.apache.cocoon.forms.DefaultFormManager.getFormDefinition(DefaultFormManager.java:179)
        at 
org.apache.cocoon.forms.DefaultFormManager.getFormDefinition(DefaultFormManager.java:167)
        at 
org.apache.cocoon.forms.DefaultFormManager.createForm(DefaultFormManager.java:109)
        at sun.reflect.GeneratedMethodAccessor123.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at 
org.mozilla.javascript.NativeJavaMethod.call(NativeJavaMethod.java:230)
        at org.mozilla.javascript.ScriptRuntime.call(ScriptRuntime.java:1244)
        at 
org.mozilla.javascript.continuations.ContinuationInterpreter.interpret(ContinuationInterpreter.java:1134)
        at 
org.mozilla.javascript.continuations.ContinuationInterpreter.interpret(ContinuationInterpreter.java:190)
        at 
org.mozilla.javascript.continuations.ContinuationInterpreter.interpret(ContinuationInterpreter.java:138)
        at 
org.mozilla.javascript.continuations.InterpretedFunctionImpl.call(InterpretedFunctionImpl.java:121)
        at org.mozilla.javascript.ScriptRuntime.call(ScriptRuntime.java:1244)
        at 
org.mozilla.javascript.ScriptableObject.callMethod(ScriptableObject.java:1591)
        at 
org.apache.cocoon.components.flow.javascript.fom.FOM_JavaScriptInterpreter.handleContinuation(FOM_JavaScriptInterpreter.java:853)
        at 
org.apache.cocoon.components.treeprocessor.sitemap.CallFunctionNode.invoke(CallFunctionNode.java:123)
        at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:46)
        at 
org.apache.cocoon.components.treeprocessor.sitemap.PreparableMatchNode.invoke(PreparableMatchNode.java:130)
        at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:68)
        at 
org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(PipelineNode.java:142)
        at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:68)
        at 
org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(PipelinesNode.java:92)
        at 
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.java:234)
        at 
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.java:176)
        at 
org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:248)
        at 
org.apache.cocoon.components.treeprocessor.sitemap.MountNode.invoke(MountNode.java:117)
        at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:46)
        at 
org.apache.cocoon.components.treeprocessor.sitemap.PreparableMatchNode.invoke(PreparableMatchNode.java:130)
        at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:68)
        at 
org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(PipelineNode.java:142)
        at 
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:68)
        at 
org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(PipelinesNode.java:92)
        at 
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.java:234)
        at 
org.apache.cocoon.components.treeprocessor.ConcreteTreeProcessor.process(ConcreteTreeProcessor.java:176)
        at 
org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:248)
        at org.apache.cocoon.Cocoon.process(Cocoon.java:679)
        at 
org.apache.cocoon.servlet.CocoonServlet.service(CocoonServlet.java:1154)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
        at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
        at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
        at 
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:407)
        at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
        at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
        at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
        at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
        at 
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
        at 
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
        at 
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
        at 
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
        at 
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
        at java.lang.Thread.run(Thread.java:595)



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