Null Pointer Exception - HtmlClient.handleUIElement

[Former Member]

Hi.

Im getting an null pointer exception when I click a button in my java webdynpro application. Im dynmically creating a button in wdDoModifyView() of my application. I create an action in design time and bind that action to the dynamically created button. When I click the button, the Nullpointer exception

throws com.sap.tc.webdynpro.clientimpl.html.client.HtmlClient.handleUIElement(HtmlClient). I try to catch the exception, but I could'nt.Could you please help me out to solve this issue.

<Stack Trace>

java.lang.NullPointerException

at com.sap.tc.webdynpro.clientimpl.html.client.HtmlClient.handleUIElementEvent(HtmlClient.java:966)

at com.sap.tc.webdynpro.clientimpl.html.client.HtmlClient.updateEventQueue(HtmlClient.java:372)

at com.sap.tc.webdynpro.clientserver.cal.AbstractClient.prepareTasks(AbstractClient.java:93)

at com.sap.tc.webdynpro.clientserver.session.ApplicationSession.doProcessing(ApplicationSession.java:294)

at com.sap.tc.webdynpro.clientserver.session.ClientSession.doApplicationProcessingPortal(ClientSession.java:727)

at com.sap.tc.webdynpro.clientserver.session.ClientSession.doApplicationProcessing(ClientSession.java:663)

at com.sap.tc.webdynpro.clientserver.session.ClientSession.doProcessing(ClientSession.java:229)

at com.sap.tc.webdynpro.clientserver.session.RequestManager.doProcessing(RequestManager.java:152)

at com.sap.tc.webdynpro.clientserver.session.core.ApplicationHandle.doProcessing(ApplicationHandle.java:73)

at com.sap.tc.webdynpro.portal.pb.impl.AbstractApplicationProxy.sendDataAndProcessActionInternal(AbstractApplicationProxy.java:877)

at com.sap.tc.webdynpro.portal.pb.impl.localwd.LocalApplicationProxy.sendDataAndProcessAction(LocalApplicationProxy.java:80)

at com.sap.portal.pb.PageBuilder.updateApplications(PageBuilder.java:1291)

at com.sap.portal.pb.PageBuilder.SendDataAndProcessAction(PageBuilder.java:325)

at com.sap.portal.pb.PageBuilder$1.doPhase(PageBuilder.java:831)

at com.sap.tc.webdynpro.clientserver.window.WindowPhaseModel.processPhaseListener(WindowPhaseModel.java:755)

at com.sap.tc.webdynpro.clientserver.window.WindowPhaseModel.doPortalDispatch(WindowPhaseModel.java:717)

at com.sap.tc.webdynpro.clientserver.window.WindowPhaseModel.processRequest(WindowPhaseModel.java:136)

at com.sap.tc.webdynpro.clientserver.window.WebDynproWindow.processRequest(WebDynproWindow.java:330)

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

at com.sap.tc.webdynpro.clientserver.session.ApplicationSession.doProcessing(ApplicationSession.java:299)

at com.sap.tc.webdynpro.clientserver.session.ClientSession.doApplicationProcessingStandalone(ClientSession.java:707)

at com.sap.tc.webdynpro.clientserver.session.ClientSession.doApplicationProcessing(ClientSession.java:661)

at com.sap.tc.webdynpro.clientserver.session.ClientSession.doProcessing(ClientSession.java:229)

at com.sap.tc.webdynpro.clientserver.session.RequestManager.doProcessing(RequestManager.java:152)

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:390)

at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:264)

at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:347)

at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:325)

at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:887)

at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:241)

at com.sap.engine.services.httpserver.server.Client.handle(Client.java:92)

at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:148)

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:100)

at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:170)

Could anyone help me to solve this issue.

Regards

Bala

[Former Member · Accepted solution]

My guess is that you have created a UI element with an invalid ID, namely an ID containing a dot ("."). UI element IDs should only consist of letters, digits and underscores.

Armin

[Former Member · Accepted solution]

Hi Armin.

Thanks for your reply.

Im creating the id too dynamically (for ex: customer_1024112255, customer_1705022612,customer_-170585861). So there is no (.) in the id.

Will there be anyother issue?

Regards

Bala

[Former Member · Accepted solution]

Minus sign is also not allowed.

Armin

[Former Member · Accepted solution]

Thanks Armin and hence the issue solved