[OS-webwork] NPE thrown if a method of a property thats null is attemped to be executed

Tue, 25 Nov 2003 08:27:02 -0800

I dont know if this is the intended way ognl is supposed to work or not but it makes debugging hard on jsp's

i have a property called productionCrews thats of List type, and i use:
<ww:property value="productionCrews.size()" />

to display the List.size() of it but if I use:
<ww:property value="productioncrews.size()" />

I get an NPE thrown below, can it made so that the result of
<ww:property value="productioncrews.size()" /> is just blank and not throw that NPE?




[ERROR] ServletDispatcher - Could not execute action
javax.servlet.ServletException
at com.evermind.server.http.EvermindPageContext.handlePageException(.:587)
at __jspPage6_WEB_INF_views_productionCrew_productionCrewList_jsp._jspService(__jspPage6_WEB_INF_views_productionCrew_productionCrewList_jsp.java:260)
at com.orionserver.http.OrionHttpJspPage.service(.:70)
at com.evermind._ay._rkb(.:5741)
at com.evermind.server.http.JSPServlet.service(.:31)
at com.evermind._hb.doFilter(.:59)
at com.opensymphony.webwork.lifecycle.RequestLifecycleFilter.doFilter(RequestLifecycleFilter.java:62)
at com.evermind._ha.doFilter(.:16)
at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(Unknown Source)
at com.evermind._cub._pod(.:383)
at com.evermind._cub._bmc(.:177)
at com.evermind._cub.forward(.:147)
at com.opensymphony.webwork.dispatcher.ServletDispatcherResult.doExecute(ServletDispatcherResult.java:67)
at com.opensymphony.webwork.dispatcher.WebWorkResultSupport.execute(WebWorkResultSupport.java:53)
at com.opensymphony.xwork.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:269)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:191)
at com.opensymphony.xwork.interceptor.DefaultWorkflowInterceptor.intercept(DefaultWorkflowInterceptor.java:58)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:169)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:37)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:169)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:37)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:169)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:37)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:169)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:37)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:169)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:37)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:169)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:37)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:169)
at com.opensymphony.xwork.interceptor.TimerInterceptor.intercept(TimerInterceptor.java:62)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:169)
at com.opensymphony.xwork.DefaultActionProxy.execute(DefaultActionProxy.java:116)
at com.opensymphony.webwork.dispatcher.ServletDispatcher.serviceAction(ServletDispatcher.java:182)
at com.opensymphony.webwork.dispatcher.ServletDispatcher.service(ServletDispatcher.java:162)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:336)
at com.evermind._hb.doFilter(.:59)
at com.opensymphony.webwork.lifecycle.RequestLifecycleFilter.doFilter(RequestLifecycleFilter.java:62)
at com.evermind._ha.doFilter(.:16)
at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(Unknown Source)
at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(Unknown Source)
at com.evermind._cub._pod(.:383)
at com.evermind._cub._bmc(.:177)
at com.evermind._ax._ltc(.:666)
at com.evermind._ax._uab(.:191)
at com.evermind._bf.run(.:62)
Root cause is;
java.lang.NullPointerException
at ognl.OgnlRuntime.callMethod(OgnlRuntime.java:646)
at ognl.ASTMethod.getValueBody(ASTMethod.java:75)
at ognl.SimpleNode.getValue(SimpleNode.java:167)
at ognl.ASTChain.getValueBody(ASTChain.java:109)
at ognl.SimpleNode.getValue(SimpleNode.java:167)
at ognl.Ognl.getValue(Ognl.java:335)
at com.opensymphony.xwork.util.OgnlValueStack.findValue(OgnlValueStack.java:104)
at com.opensymphony.webwork.views.jsp.WebWorkTagSupport.findValue(WebWorkTagSupport.java:51)
at com.opensymphony.webwork.views.jsp.PropertyTag.doStartTag(PropertyTag.java:58)
at __jspPage6_WEB_INF_views_productionCrew_productionCrewList_jsp._jspService(__jspPage6_WEB_INF_views_productionCrew_productionCrewList_jsp.java:38)
at com.orionserver.http.OrionHttpJspPage.service(.:70)
at com.evermind._ay._rkb(.:5741)
at com.evermind.server.http.JSPServlet.service(.:31)
at com.evermind._hb.doFilter(.:59)
at com.opensymphony.webwork.lifecycle.RequestLifecycleFilter.doFilter(RequestLifecycleFilter.java:62)
at com.evermind._ha.doFilter(.:16)
at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(Unknown Source)
at com.evermind._cub._pod(.:383)
at com.evermind._cub._bmc(.:177)
at com.evermind._cub.forward(.:147)
at com.opensymphony.webwork.dispatcher.ServletDispatcherResult.doExecute(ServletDispatcherResult.java:67)
at com.opensymphony.webwork.dispatcher.WebWorkResultSupport.execute(WebWorkResultSupport.java:53)
at com.opensymphony.xwork.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:269)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:191)
at com.opensymphony.xwork.interceptor.DefaultWorkflowInterceptor.intercept(DefaultWorkflowInterceptor.java:58)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:169)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:37)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:169)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:37)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:169)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:37)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:169)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:37)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:169)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:37)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:169)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:37)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:169)
at com.opensymphony.xwork.interceptor.TimerInterceptor.intercept(TimerInterceptor.java:62)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:169)
at com.opensymphony.xwork.DefaultActionProxy.execute(DefaultActionProxy.java:116)
at com.opensymphony.webwork.dispatcher.ServletDispatcher.serviceAction(ServletDispatcher.java:182)
at com.opensymphony.webwork.dispatcher.ServletDispatcher.service(ServletDispatcher.java:162)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:336)
at com.evermind._hb.doFilter(.:59)
at com.opensymphony.webwork.lifecycle.RequestLifecycleFilter.doFilter(RequestLifecycleFilter.java:62)
at com.evermind._ha.doFilter(.:16)
at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(Unknown Source)
at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(Unknown Source)
at com.evermind._cub._pod(.:383)
at com.evermind._cub._bmc(.:177)
at com.evermind._ax._ltc(.:666)
at com.evermind._ax._uab(.:191)
at com.evermind._bf.run(.:62)




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