Null Pointer Exception in Message Area

[Former Member]

Hi!

I just want to get some inputs. I have this Message Area to display errors in Web Dynpro, but from time to time I get this Null Pointer Exception when an event takes place. Don't know why this happens, but the trace is not found my code.

Here's the Stack Trace:

+"java.lang.NullPointerException+

++ at com.sap.tc.webdynpro.clientserver.uielib.pattern.uradapter.MessageAreaAdapter._getConnectedControlId(MessageAreaAdapter.java:3684)++

++ at com.sap.tc.webdynpro.clientserver.uielib.pattern.uradapter.MessageAreaAdapter.access$900(MessageAreaAdapter.java:67)++

++ at com.sap.tc.webdynpro.clientserver.uielib.pattern.uradapter.MessageAreaAdapter$Rows.doNext(MessageAreaAdapter.java:2188)++

++ at com.sap.tc.webdynpro.clientserver.uielements.adaptbase.IndexedItemsIterator.next(IndexedItemsIterator.java:54)++

++ at com.sap.tc.webdynpro.clientserver.uielib.pattern.uradapter.MessageAreaAdapter.getSelection(MessageAreaAdapter.java:3653)++

++ at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.RenderManager.render(RenderManager.java:424)++

++ at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.RenderManager.render(RenderManager.java:133)++

++ at com.sap.tc.ur.renderer.ie6.SingleColumnLayoutRenderer.renderSingleColumnLayoutCellFragment(SingleColumnLayoutRenderer.java:679)++

++ at com.sap.tc.ur.renderer.ie6.SingleColumnLayoutRenderer.renderSingleColumnLayoutFragment(SingleColumnLayoutRenderer.java:253)++

++ at com.sap.tc.ur.renderer.ie6.SingleColumnLayoutRenderer.render(SingleColumnLayoutRenderer.java:74)++

++ at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.RenderManager.render(RenderManager.java:434)++

++ at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.RenderManager.render(RenderManager.java:133)++

++ at com.sap.tc.ur.renderer.ie6.ScrollContainerRenderer.renderScrollContainerFragment(ScrollContainerRenderer.java:619)++

++ at com.sap.tc.ur.renderer.ie6.ScrollContainerRenderer.render(ScrollContainerRenderer.java:74)++

++ at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.RenderManager.render(RenderManager.java:434)++

++ at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.RenderManager.render(RenderManager.java:133)++

++ at com.sap.tc.ur.renderer.ie6.TabStripRenderer.renderTabStripItemContentFragment(TabStripRenderer.java:1799)++

++ at com.sap.tc.ur.renderer.ie6.TabStripRenderer.renderTabStripFragment(TabStripRenderer.java:879)++

++ at com.sap.tc.ur.renderer.ie6.TabStripRenderer.render(TabStripRenderer.java:69)++

++ at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.RenderManager.render(RenderManager.java:434)++

++ at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.RenderManager.render(RenderManager.java:133)++

++ at com.sap.tc.ur.renderer.ie6.MatrixLayoutRenderer.renderMatrixLayoutCellFragment(MatrixLayoutRenderer.java:790)++

++ at com.sap.tc.ur.renderer.ie6.MatrixLayoutRenderer.renderMatrixLayoutRowFragment(MatrixLayoutRenderer.java:376)++

++ at com.sap.tc.ur.renderer.ie6.MatrixLayoutRenderer.renderMatrixLayoutFragment(MatrixLayoutRenderer.java:326)++

++ at com.sap.tc.ur.renderer.ie6.MatrixLayoutRenderer.render(MatrixLayoutRenderer.java:79)++

++ at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.RenderManager.render(RenderManager.java:434)++

++ at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.RenderManager.render(RenderManager.java:133)++

++ at com.sap.tc.ur.renderer.ie6.ScrollContainerRenderer.renderScrollContainerFragment(ScrollContainerRenderer.java:619)++

++ at com.sap.tc.ur.renderer.ie6.ScrollContainerRenderer.render(ScrollContainerRenderer.java:74)++

++ at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.RenderManager.render(RenderManager.java:434)++

++ at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.RenderManager.render(RenderManager.java:133)++

++ at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.UiWindowRenderer.render(UiWindowRenderer.java:52)++

++ at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.RenderManager.render(RenderManager.java:434)++

++ at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.RenderManager.render(RenderManager.java:133)++

++ at com.sap.tc.webdynpro.clientimpl.html.client.HtmlClient.sendHtml(HtmlClient.java:1058)++

++ at com.sap.tc.webdynpro.clientimpl.html.client.HtmlClient.fillDynamicTemplateContext(HtmlClient.java:458)++

++ at com.sap.tc.webdynpro.clientimpl.html.client.HtmlClient.sendResponse(HtmlClient.java:1245)++

++ at com.sap.tc.webdynpro.clientimpl.html.client.HtmlClient.retrieveData(HtmlClient.java:253)++

++ at com.sap.tc.webdynpro.clientserver.window.WindowPhaseModel.doRetrieveData(WindowPhaseModel.java:595)++

++ at com.sap.tc.webdynpro.clientserver.window.WindowPhaseModel.processRequest(WindowPhaseModel.java:156)++

++ at com.sap.tc.webdynpro.clientserver.window.WebDynproWindow.processRequest(WebDynproWindow.java:335)++

++ at com.sap.tc.webdynpro.clientserver.cal.AbstractClient.executeTasks(AbstractClient.java:143)++

++ at com.sap.tc.webdynpro.clientserver.session.ApplicationSession.doProcessing(ApplicationSession.java:321)++

++ at com.sap.tc.webdynpro.clientserver.session.ClientSession.doApplicationProcessingStandalone(ClientSession.java:713)++

++ at com.sap.tc.webdynpro.clientserver.session.ClientSession.doApplicationProcessing(ClientSession.java:666)++

++ at com.sap.tc.webdynpro.clientserver.session.ClientSession.doProcessing(ClientSession.java:250)++

++ at com.sap.tc.webdynpro.clientserver.session.RequestManager.doProcessing(RequestManager.java:149)++

++ at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doContent(DispatcherServlet.java:62)++

++ at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doPost(DispatcherServlet.java:53)++

++ at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)++

++ at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)++

++ at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:401)++

++ at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:266)++

++ at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:386)++

++ at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:364)++

++ at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:1039)++

++ at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:265)++

++ at com.sap.engine.services.httpserver.server.Client.handle(Client.java:95)++

++ at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:175)++

++ at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:33)++

++ at com.sap.engine.core.cluster.impl6.session.MessageRunner.run(MessageRunner.java:41)++

++ at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)++

++ at java.security.AccessController.doPrivileged(Native Method)++

++ at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:102)++

++ at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:172)"++

Just wondering if this can be solved on my end or is this a glitch? Would really appreciate some inputs!

Thanks!

[Former Member]

Seems that we can't replicate the error again. Must be a glitch.

[Former Member]

Addendum:

Hi!

Just want to say that this doesn't happen all the time when I test the app. Actually, as of the moment, I'm having a difficult time replicating the error even though I'm haven't done anything yet to address this "error".

[Former Member]

Hi,

How complex is your UI? What is the level of nesting you have done? What all layouts are used?

Regards

Ayyapparaj

[former_member185086]

Hi,

Here two possibility

1. This is the case when we get something as return form the BAPI/RFC and want to display in our message area but return message itself is null like this statement

wdComponentAPI.getMessageManager().reportException(wdContext.nodeOutput_Salesorder_Create().currentOutput_Salesorder_CreateElement().getSalesdocument());

2.And this is when

try

{

executableClazz.execute();

nodeToinvalidate.invalidate();

} catch (WDDynamicRFCExecuteException ree)

{

wdComponentAPI.getMessageManager().reportException(ree);

or

wdComponentAPI.getMessageManager().reportException(ree.getMessage);

}

3. Message Area is simple UI element which ensure only the place where we have to so the message

So Check your code again it might solve your problem

Best Regards

Satish Kumar

[Former Member]

Well my UI is not that complex. It only contains two tables and some event buttons. It's using a Matrix Layout.

[Former Member]

Hi!

Thanks for sharing your input! However, I'm not using any RFC to display something in the Message Area. The app only uses the message area to show some error messages (these are hardcoded).

[Former Member]

Hello there,

Could you please send the line of code where you are getting this error? For exaple, the line that goes like this:

msgMng.reportSuccess("Bla");

Thank you

Christiaan

[Former Member]

The exception stack trace does not show the actual line it was caught in my code. I'm not sure if this is a Message Area back-end implementation problem.