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null pointer exception when message box code is called.

Former Member

on ‎09-03-2009 12:40 AM

0 Kudos

Hi Experts, using NWDS 7.0.18

I'm really stuck and wondering if someone can help me?

I have an application that invokes a Java Bean model. The java bean invokes a web service and fetches some data.

In my web dynpro app, in the onActionSearch method, I have a message box that informs the user if no results are returned and then they have other options via button actions from the message box that they can take.

Here is when the error occurs,

1) The user types in search parameters in the input fields and enters search, a valid result set is returned and displayed in the table

2) The user changes the input parameters in the input fields that returns no results so the message box should be displayed

Instead of the message box the following error is returned:

java.lang.NullPointerException

at com.sap.tc.webdynpro.clientserver.uielib.standard.uradapter.TextViewAdapter.getSelection(TextViewAdapter.java:1215)

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.SapTableCellRenderer.renderSapTableGenericCellFragment(SapTableCellRenderer.java:1211)

at com.sap.tc.ur.renderer.ie6.SapTableCellRenderer.renderSapTableCellFragment(SapTableCellRenderer.java:209)

at com.sap.tc.ur.renderer.ie6.SapTableCellRenderer.render(SapTableCellRenderer.java:84)

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.SapTableRowRenderer.renderSapTableRowFragment(SapTableRowRenderer.java:126)

at com.sap.tc.ur.renderer.ie6.SapTableRowRenderer.render(SapTableRowRenderer.java:54)

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.SapTableDefaultBodyRenderer.renderSapTableDefaultBodyFragment(SapTableDefaultBodyRenderer.java:214)

at com.sap.tc.ur.renderer.ie6.SapTableDefaultBodyRenderer.render(SapTableDefaultBodyRenderer.java:44)

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.SapTableRenderer.renderSapTableFragment(SapTableRenderer.java:795)

at com.sap.tc.ur.renderer.ie6.SapTableRenderer.render(SapTableRenderer.java:84)

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.FlowLayoutRenderer.renderFlowLayoutItemFragment(FlowLayoutRenderer.java:288)

at com.sap.tc.ur.renderer.ie6.FlowLayoutRenderer.renderFlowLayoutFragment(FlowLayoutRenderer.java:244)

at com.sap.tc.ur.renderer.ie6.FlowLayoutRenderer.render(FlowLayoutRenderer.java:49)

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:512)

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.FlowLayoutRenderer.renderFlowLayoutItemFragment(FlowLayoutRenderer.java:288)

at com.sap.tc.ur.renderer.ie6.FlowLayoutRenderer.renderFlowLayoutFragment(FlowLayoutRenderer.java:244)

at com.sap.tc.ur.renderer.ie6.FlowLayoutRenderer.render(FlowLayoutRenderer.java:49)

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.GroupRenderer.renderGroupFragment(GroupRenderer.java:1194)

at com.sap.tc.ur.renderer.ie6.GroupRenderer.render(GroupRenderer.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.GridLayoutRenderer.renderGridLayoutCellFragment(GridLayoutRenderer.java:826)

at com.sap.tc.ur.renderer.ie6.GridLayoutRenderer.renderGridLayoutRowFragment(GridLayoutRenderer.java:424)

at com.sap.tc.ur.renderer.ie6.GridLayoutRenderer.renderGridLayoutFragment(GridLayoutRenderer.java:336)

at com.sap.tc.ur.renderer.ie6.GridLayoutRenderer.render(GridLayoutRenderer.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.GroupRenderer.renderGroupFragment(GroupRenderer.java:1194)

at com.sap.tc.ur.renderer.ie6.GroupRenderer.render(GroupRenderer.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.FlowLayoutRenderer.renderFlowLayoutItemFragment(FlowLayoutRenderer.java:288)

at com.sap.tc.ur.renderer.ie6.FlowLayoutRenderer.renderFlowLayoutFragment(FlowLayoutRenderer.java:244)

at com.sap.tc.ur.renderer.ie6.FlowLayoutRenderer.render(FlowLayoutRenderer.java:49)

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:1247)

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.window.WebDynproWindow.processPhaseLoop(WebDynproWindow.java:345)

at com.sap.tc.webdynpro.clientserver.cal.AbstractClient.executeTasks(AbstractClient.java:152)

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(AccessController.java:219)

at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:104)

at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:176)

But if I do the search the first time around using input parameters that I know won't return a result, the message box appears fine!!!

Any thoughts or suggestions?

MM

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Answers (3)

Answers (3)

Former Member
‎09-10-2009 3:24 PM
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Closing thread...not answered...workaround in place.

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former_member185086
Active Contributor
‎09-03-2009 7:01 AM
0 Kudos

Hi Marshall

Please put your question in consice and clean way It is just a very common Nullpointer exception.

Problem could be when query returns no result and you try to display some message which is either coming from backend or

null sistuation is not handled properly.

Check it through debug or by simply print hardcoded string.

Best Regards

Satish Kumar

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Former Member
‎09-03-2009 12:44 AM
0 Kudos

Here is the code in my onActionSearch method:


public void onActionSearch(com.sap.tc.webdynpro.progmodel.api.IWDCustomEvent wdEvent )
  {
    //@@begin onActionSearch(ServerEvent)
    try
    {
	if(  null == wdContext.currentInputElement().getFName() ||
	     null == wdContext.currentInputElement().getLName() ||
	    "".equalsIgnoreCase(wdContext.currentInputElement().getFName().trim()) ||
	    "".equalsIgnoreCase(wdContext.currentInputElement().getLName().trim()) )
	{
		IWDControllerInfo contInfo = wdControllerAPI.getViewInfo().getViewController();
		IWDConfirmationDialog dialog = wdComponentAPI.getWindowManager()
		  .createConfirmationWindow
		("Required fields cannot be empty!", contInfo.findInEventHandlers("ok"), "OK");
		dialog.setTitle("Error:");
		dialog.show();
	}
	else
	{
		wdThis.wdGetCompController().invalidateDataNodes();
		wdThis.wdGetCompController().getIndData();
		if(wdContext.nodeTable().size() == 0)
	                    {
			String msg = "Did not find any records matching the supplied criteria," +
			 " would you like to request one to be created?";
			IWDControllerInfo contInfo = wdControllerAPI.getViewInfo().getViewController();
			IWDConfirmationDialog dialog = 
				wdComponentAPI.getWindowManager()
				  .createConfirmationWindow
				(msg, contInfo.findInEventHandlers("yes"), "Yes");
			dialog.addChoice(contInfo.findInEventHandlers("no"), "No");
			dialog.setTitle("Confirmation message.");
			dialog.show();
		}
	}
    }
    catch(Exception e)
    {
    	wdComponentAPI.getMessageManager().reportException(e.getLocalizedMessage(), true);
	wdComponentAPI.getMessageManager().reportException(""+e.getCause(), true);
	e.printStackTrace();
    }
   	
    //@@end
  }

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Former Member
‎09-04-2009 5:24 PM
0 Kudos

Hi Eminem,

remove this:


wdThis.wdGetCompController().invalidateDataNodes();

and send me a CD if it works.

EDIT: Btw you really should use a method like this:


public boolean isEmptyField( java.lang.Object attributeValue )
  {
    //@@begin isEmptyField()
    	String stringValue;
	if ((attributeValue != null))
	{	
		stringValue = attributeValue.toString();
		if (stringValue.trim().length() > 0)
		{
			return false;
		}
	}
	return true;	
    //@@end
  }

In order to check for null or empty values.

Cheers!

Julio C.

Former Member
‎09-08-2009 5:04 PM
0 Kudos

Ok heres the situation,

The problem is occuring because of an empty table but what is strange is this:

When the application is first launched, the context node that is bound to the table is null, and as a result the table reads "Table is empty".

Everytime a search is invoked the table context is invalidated to clear out the previous results.

Then when a search is executed and some values are retrieved, the table displays these values. Then when another search is executed one which retrieves no values, a null pointer exception is encountered. At this point I'm thinking the table should just read "Table is empty" as before??

Any suggestions?

MM

Former Member
‎09-08-2009 7:58 PM
0 Kudos

Hi,

I think the getIndData() method in the component controller is somehow messing up the context. Can you post that piece of code? Have you debugged to check if the runtime gets into the message box display code?

May be you should try removeElement instead of invalidate - worth a shot.

Regards,

Satyajit

Former Member
‎09-09-2009 3:30 PM
0 Kudos

Hi Satyajit,

Thanks for the tip, my only concern with removeElement is having to loop through 100,000 - 1,000,000 records deleting each one, 1 by 1. It can be costly.

I did step thru the code in the debugger, and the message box code does get called, but never renders as the web dynpro runtime tries to render the table first, and the null pointer is thrown before the render code for the mssage box is called.

Here is what I had to do as a work around, if the table context is null, i just create and add an empty element to the context.

MM

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