Re: [S2][T2] NullPointerException from UrlHelper.buildurl()

Wed, 08 Oct 2008 16:23:51 -0700 

Any ideas on this issue?

What I am trying to do is have a main tiles definition whose JSP has a
<s:form>.   That page pulls in a sub-tile using <tiles:insertAttribute>.
The sub-tile page has the form control(s).   Just trying to render this
page causes the NullPointerException.

Thanks,
John


928572663 wrote:
I am getting a persistent NullPointerException from UrlHelper.buildurl(). It happens in my app and also in my simple test case below.
What I am trying to do is have a main tiles definition whose JSP has a <s:form>. That page pulls in a sub-tile using <tiles:insertAttribute>. The sub-tile page has the form control(s). Just trying to render this page causes the NullPointerException. 

I'm using versions:

struts 2.1.2
tiles 2.0.5

Here is my simple test case.

My struts action class forwards to "TestMainLayout" to render the page.

/tiles-test-defs.xml

<!DOCTYPE tiles-definitions PUBLIC
       "-//Apache Software Foundation//DTD Tiles Configuration 2.0//EN"
       "http://tiles.apache.org/dtds/tiles-config_2_0.dtd";>

<tiles-definitions>

   <definition name="TestMainLayout"
      template="/test/main.jsp">
      <put-attribute name="app_title" value="Tiles Bug" />
      <put-attribute name="content" value="/test/welcome.jsp" />
   </definition>

   <definition name="JunkTest" extends="TestMainLayout">
      <put-attribute name="title" value="Hello there" />
      <put-attribute name="instruction"
         value="Please enter some information" />
      <put-attribute name="content" value="/test/junk.jsp" />
   </definition>

</tiles-definitions>



/main.jsp
<!DOCTYPE html PUBLIC "~//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";> 

<%@ page contentType="text/html;charset=cp1252" language="java"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<%@ taglib uri="http://tiles.apache.org/tags-tiles"; prefix="tiles"%>

<html>
    <head>
        <title><tiles:insertAttribute name="app_title" />
        </title>
    </head>
    <body>
        <div id="content_tile">
            <s:form action="/my_package/myAxion">
                <tiles:insertAttribute name="content" />
            </s:form>
        </div>
    </body>
</html>

/junk.jsp

<%@ page contentType="text/html;charset=cp1252" language="java"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<%@ taglib uri="http://tiles.apache.org/tags-tiles"; prefix="tiles"%>


<s:textfield name="selectedAction" size="12" />


Here is the stacktrace.
6522947 [[ACTIVE] ExecuteThread: '5' for queue: 'weblogic.kernel.Default (self-tuning)'] ERROR impl.BasicTilesContainer - Error ren 
dering tile
java.lang.NullPointerException
at org.apache.struts2.views.util.UrlHelper.buildUrl(UrlHelper.java:85) at org.apache.struts2.views.util.UrlHelper.buildUrl(UrlHelper.java:76) at org.apache.struts2.views.util.UrlHelper.buildUrl(UrlHelper.java:72) at org.apache.struts2.views.util.UrlHelper.buildUrl(UrlHelper.java:68) at org.apache.struts2.components.ServletUrlRenderer.renderFormUrl(ServletUrlRenderer.java:174) at org.apache.struts2.components.Form.populateComponentHtmlId(Form.java:223) at org.apache.struts2.components.UIBean.evaluateParams(UIBean.java:786) 
        at org.apache.struts2.components.UIBean.end(UIBean.java:509)
at org.apache.struts2.views.jsp.ComponentTagSupport.doEndTag(ComponentTagSupport.java:42) 
        at jsp_servlet._test.__main._jsp__tag1(__main.java:201)
        at jsp_servlet._test.__main._jspService(__main.java:112)
        at weblogic.servlet.jsp.JspBase.service(JspBase.java:34)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:226) at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:124) at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:283) at weblogic.servlet.internal.ServletStubImpl.onAddToMapException(ServletStubImpl.java:394) at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:309) at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42) at org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:461) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42) at weblogic.servlet.internal.RequestDispatcherImpl.invokeServlet(RequestDispatcherImpl.java:526) at weblogic.servlet.internal.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:261) at org.apache.tiles.servlet.context.ServletTilesRequestContext.forward(ServletTilesRequestContext.java:198) at org.apache.tiles.servlet.context.ServletTilesRequestContext.dispatch(ServletTilesRequestContext.java:185) at org.apache.tiles.context.TilesRequestContextWrapper.dispatch(TilesRequestContextWrapper.java:72) at org.apache.struts2.tiles.StrutsTilesRequestContext.dispatch(StrutsTilesRequestContext.java:88) at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:419) at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:370) at org.apache.struts2.views.tiles.TilesResult.doExecute(TilesResult.java:105) at org.apache.struts2.dispatcher.StrutsResultSupport.execute(StrutsResultSupport.java:186) at com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:355) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:259) at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:141) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:230) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:456) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:227) at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:248) at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.jav 
a:49)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:230) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:456) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:227) at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:124) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:230) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:456) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:227) at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:170) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:230) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:456) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:227) at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:170) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:230) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:456) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:227) at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:104) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:230) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:456) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:227) at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:84) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:230) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:456) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:227) at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:208) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:230) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:456) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:227) at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:88) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:230) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:456) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:227) at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:127) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:230) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:456) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:227) at org.apache.struts2.interceptor.ProfilingActivationInterceptor.intercept(ProfilingActivationInterceptor.java:104) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:230) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:456) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:227) at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:230) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:456) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:227) at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:130) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:230) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:456) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:227) at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:143) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:230) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:456) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:227) at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:137) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:230) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:456) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:227) at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:230) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:456) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:227) at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:130) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:230) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:456) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:227) at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:176) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:230) at com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:456) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:227) at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52) at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:477) at org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:467) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42) at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3393) at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321) 
        at weblogic.security.service.SecurityManager.runAs(Unknown Source)
at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2140) at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2046) at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1366) 
        at weblogic.work.ExecuteThread.execute(ExecuteThread.java:200)
        at weblogic.work.ExecuteThread.run(ExecuteThread.java:172)
<Oct 1, 2008 5:23:22 PM CDT> <Error> <HTTP> <BEA-101020> <[EMAIL PROTECTED] - appName: '_appsdi r_ipsm2_war', name: 'ipsm2.war', context-path: '/ipsm2'] Servlet failed with Exception 
java.lang.IllegalStateException: Response already committed
at weblogic.servlet.internal.ServletResponseImpl.objectIfCommitted(ServletResponseImpl.java:1486) at weblogic.servlet.internal.ServletResponseImpl.sendError(ServletResponseImpl.java:603) at org.apache.struts2.dispatcher.Dispatcher.sendError(Dispatcher.java:725) at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:488) at org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:467) 
        Truncated. see log file for complete stacktrace
 >

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