NullpointerExceptions in portals.

[bharat sripuram]

Hi,

Am using portals. I have given all the required fields in the jsp and clicked continue button. There would be some validations done on the required fields and it is forwarded to next jsp. But am getting the following error. can someone help me in this ? am using weblogic 8.2.

Error opening /pageflows/cf/cfFlows/ComplaintInvestigation.jsp.
The source of this error is java.lang.NullPointerException at
jsp_servlet._pageflows._cf._cfflows.__complaintinvestigation._jspService
(Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletResponse;)V(Optimized Method) at
weblogic.servlet.jsp.JspBase.service(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V(Optimized Method)
at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run()Ljava/lang/Object;(Optimized Method) at
weblogic.servlet.internal.ServletStubImpl.invokeServlet
(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;Lweblogic/servlet/internal/FilterChainImpl;)V(Optimized
Method) at weblogic.servlet.internal.TailFilter.doFilter
(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;Ljavax/servlet/FilterChain;)V(Optimized Method) at
weblogic.servlet.internal.FilterChainImpl.doFilter(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V
(Optimized Method) at com.bea.p13n.servlets.PortalServletFilter.doFilter
(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;Ljavax/servlet/FilterChain;)V(Optimized Method) at
weblogic.servlet.internal.FilterChainImpl.doFilter(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V
(Optimized Method) at com.bea.wlw.netui.pageflow.PageFlowJspFilter.doFilter
(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;Ljavax/servlet/FilterChain;)V(Optimized Method) at
weblogic.servlet.internal.RequestDispatcherImpl.include(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V
(Optimized Method) at com.bea.wlw.netui.pageflow.scoping.internal.ScopedRequestDispatcher.include
(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V(Optimized Method) at
com.bea.netuix.servlets.controls.content.JspContent.beginRender(Ljava/io/Writer;)Z(Optimized Method) at
com.bea.netuix.servlets.controls.content.NetuiContent.beginRender(Ljava/io/Writer;)Z(Optimized Method) at
com.bea.netuix.nf.ControlLifecycle$1.visit(Lcom/bea/netuix/nf/UIControl;Ljava/lang/Object;)Z(Optimized Method) at
com.bea.netuix.nf.ControlTreeWalker.walkRecursiveRender
(Lcom/bea/netuix/nf/VisitorType;Lcom/bea/netuix/nf/UIControl;Ljava/lang/Object;)V(Optimized Method) at
com.bea.netuix.nf.ControlTreeWalker.walkRecursiveRender
(Lcom/bea/netuix/nf/VisitorType;Lcom/bea/netuix/nf/UIControl;Ljava/lang/Object;)V(Optimized Method) at
com.bea.netuix.nf.ControlTreeWalker.walkRecursiveRender
(Lcom/bea/netuix/nf/VisitorType;Lcom/bea/netuix/nf/UIControl;Ljava/lang/Object;)V(Optimized Method) at
com.bea.netuix.nf.ControlTreeWalker.walkRecursiveRender
(Lcom/bea/netuix/nf/VisitorType;Lcom/bea/netuix/nf/UIControl;Ljava/lang/Object;)V(Optimized Method) at
com.bea.netuix.nf.ControlTreeWalker.walkRecursiveRender
(Lcom/bea/netuix/nf/VisitorType;Lcom/bea/netuix/nf/UIControl;Ljava/lang/Object;)V(Optimized Method) at
com.bea.netuix.nf.ControlTreeWalker.walkRecursiveRender
(Lcom/bea/netuix/nf/VisitorType;Lcom/bea/netuix/nf/UIControl;Ljava/lang/Object;)V(Optimized Method) at
com.bea.netuix.nf.ControlTreeWalker.walk
(Lcom/bea/netuix/nf/VisitorType;Lcom/bea/netuix/nf/UIControl;Lcom/bea/netuix/nf/concurrency/ControlTreeWalkerPool;)
V(Optimized Method) at com.bea.netuix.nf.ControlTreeWalker.walk
(Lcom/bea/netuix/nf/VisitorType;Lcom/bea/netuix/nf/UIControl;)V(Optimized Method) at com.bea.netuix.nf.Lifecycle.run
(Lcom/bea/netuix/nf/UIControl;[Lcom/bea/netuix/nf/VisitorType;)V(Lifecycle.java:356) at
com.bea.netuix.nf.UIControl.render()V(UIControl.java:536) at
com.bea.netuix.servlets.controls.PresentationContext.render(Ljavax/servlet/http/HttpServletRequest;)V
(PresentationContext.java:405) at com.bea.netuix.servlets.util.RenderToolkit.renderChild
(Lcom/bea/netuix/servlets/controls/PresentationContext;Ljavax/servlet/http/HttpServletRequest;)V
(RenderToolkit.java:123) at com.bea.netuix.servlets.jsp.taglib.RenderChild.doStartTag()I(RenderChild.java:58) at
jsp_servlet._framework._skeletons._bci.__gridlayout._jspService
(Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletResponse;)V(Optimized Method) at
weblogic.servlet.jsp.JspBase.service(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V(Optimized Method)
at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run()Ljava/lang/Object;(Optimized Method) at
weblogic.servlet.internal.ServletStubImpl.invokeServlet
(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;Lweblogic/servlet/internal/FilterChainImpl;)V(Optimized
Method) at weblogic.servlet.internal.ServletStubImpl.invokeServlet
(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V(Optimized Method)

Please let me know if you require any thing else.

Regards,
Bharat

[Gilbert Tan]

Well ... May be you have set all required parameters. But before coming to the page, you may definitely do some processing of data (Most probably you are calling the business layer/ data access later).

When, an exception is thrown out from any of those layers, this situation can occur. Because, due to the exception, the objects being accessed in this page are not properly set (in session/ renderRequest).