on 05-08-2008 11:20 PM
Hi every body!
I'm facing a problem working with a context node in a component controller that have an atribute of type java.io.Serializable. Whenever I try to access this atribute a got a nullPointerException.
Is there any restriction on the data types that i can use for an attribute?
Regards
Jose Arango
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Hi,
try out the following code and let me know if you still get null pointer exception:
if(wdContext.nodeReqFind().size>0)
{
wdContext.currentReqFindElement().setId("<any string >");
}
regards,
amit bagati
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Hi jose
have you solved your issue??
in my case it works fine with your code. ie by accessing the element of node(cardinality 1,1) as wdContext.current<node_Name>Element().set<attribute_Name>(value);
also you can try it this way
wdContext.node<node_Name>.getElementAt(0).getAttributeValue('<attribute_Name>","value");
Deepak
Did you initialize that object?
nikhiL
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Hi nikhiL:
Yes, I have initialized the object. This is my scenario.
In my controller context i have these nodes and both have 1..1 cardinality.
Find
-
id (String)
ReqFind
-
Response
-
Return (java.io.Serializable)
-
id (java.io.Serializable)
-
type (java.lang.Class)
The ReqFind node is bind to an EJB model.
In the wdDoInit i have the following code.
CrudModel modelo = new CrudModel();
ReqFind req = new ReqFind(modelo);
wdContext.nodeReqFind().addElement(req);
wdContext.currentFindElement().setId("HW300");
wdContext.currentReqFindElement().setId(wdContext.currentFindElement().getId());
And when execute the app I got a nullPointerException where I set the id attribute for the ReqFind node.
Hi Gopal:
This is the detail error information.
com.sap.tc.webdynpro.services.exceptions.WDRuntimeException: Exception was thrown in preprocessing phase of application session ApplicationSession(name=com.sap.demo.course.courseapp.CourseApp, id=508a4d601dda11ddcac50002554f6621). The causing exception is nested. RID=5080b0701dda11dda0b80002554f6621
at com.sap.tc.webdynpro.clientserver.session.ClientSession.doPreprocessing(ClientSession.java:650)
at com.sap.tc.webdynpro.clientserver.session.ClientSession.doProcessing(ClientSession.java:225)
at com.sap.tc.webdynpro.clientserver.session.RequestManager.doProcessing(RequestManager.java:231)
at com.sap.tc.webdynpro.serverimpl.core.sessionctx.AbstractExecutionContextDispatcher.delegateToRequestManager(AbstractExecutionContextDispatcher.java:205)
at com.sap.tc.webdynpro.serverimpl.wdc.sessionctx.DispatchHandlerForRequestManager.doService(DispatchHandlerForRequestManager.java:38)
at com.sap.tc.webdynpro.serverimpl.wdc.sessionctx.AbstractDispatchHandler.service(AbstractDispatchHandler.java:116)
at com.sap.engine.services.servlets_jsp.server.deploy.impl.module.IRequestDispatcherImpl.dispatch(IRequestDispatcherImpl.java:93)
at com.sap.tc.webdynpro.serverimpl.wdc.sessionctx.ExecutionContextDispatcher.dispatchToRequestManager(ExecutionContextDispatcher.java:140)
at com.sap.tc.webdynpro.serverimpl.core.sessionctx.AbstractExecutionContextDispatcher.dispatch(AbstractExecutionContextDispatcher.java:93)
at com.sap.tc.webdynpro.serverimpl.core.sessionctx.AbstractExecutionContextDispatcher.dispatch(AbstractExecutionContextDispatcher.java:105)
at com.sap.tc.webdynpro.serverimpl.core.AbstractDispatcherServlet.doContent(AbstractDispatcherServlet.java:87)
at com.sap.tc.webdynpro.serverimpl.core.AbstractDispatcherServlet.doGet(AbstractDispatcherServlet.java:54)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at com.sap.engine.services.servlets_jsp.server.Invokable.invoke(Invokable.java:66)
at com.sap.engine.services.servlets_jsp.server.Invokable.invoke(Invokable.java:32)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:431)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:289)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:387)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:376)
at com.sap.engine.services.servlets_jsp.filters.ServletSelector.process(ServletSelector.java:85)
at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:71)
at com.sap.engine.services.servlets_jsp.filters.ApplicationSelector.process(ApplicationSelector.java:160)
at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:71)
at com.sap.engine.services.httpserver.filters.WebContainerInvoker.process(WebContainerInvoker.java:67)
at com.sap.engine.services.httpserver.chain.HostFilter.process(HostFilter.java:9)
at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:71)
at com.sap.engine.services.httpserver.filters.ResponseLogWriter.process(ResponseLogWriter.java:60)
at com.sap.engine.services.httpserver.chain.HostFilter.process(HostFilter.java:9)
at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:71)
at com.sap.engine.services.httpserver.filters.DefineHostFilter.process(DefineHostFilter.java:27)
at com.sap.engine.services.httpserver.chain.ServerFilter.process(ServerFilter.java:12)
at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:71)
at com.sap.engine.services.httpserver.filters.MonitoringFilter.process(MonitoringFilter.java:29)
at com.sap.engine.services.httpserver.chain.ServerFilter.process(ServerFilter.java:12)
at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:71)
at com.sap.engine.services.httpserver.server.Processor.chainedRequest(Processor.java:309)
at com.sap.engine.services.httpserver.server.Processor$FCAProcessorThread.run(Processor.java:222)
at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
at java.security.AccessController.doPrivileged(Native Method)
at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:152)
at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:247)
Caused by: java.lang.NullPointerException:
at com.sap.tc.cmiimpl.base.model.BaseGenericModelClass.setAttributeValue(BaseGenericModelClass.java:283)
at co.com.crystal.crudmodel.ReqFind.setId(ReqFind.java:53)
at com.sap.demo.course.courseview.wdp.IPublicCourseView$IReqFindElement.setId(IPublicCourseView.java:374)
at com.sap.demo.course.courseview.CourseView.wdDoInit(CourseView.java:121)
at com.sap.demo.course.courseview.wdp.InternalCourseView.wdDoInit(InternalCourseView.java:135)
at com.sap.tc.webdynpro.progmodel.generation.DelegatingComponent.doInit(DelegatingComponent.java:160)
at com.sap.tc.webdynpro.progmodel.controller.Controller.initController(Controller.java:230)
at com.sap.tc.webdynpro.progmodel.components.Component.initController(Component.java:249)
at com.sap.tc.webdynpro.progmodel.controller.Controller.init(Controller.java:209)
at com.sap.tc.webdynpro.clientserver.cal.ClientApplication.init(ClientApplication.java:513)
at com.sap.tc.webdynpro.clientserver.cal.ClientApplication.doPreprocessing(ClientApplication.java:1228)
at com.sap.tc.webdynpro.serverimpl.core.sessionctx.AbstractExecutionContextDispatcher.delegateToApplicationDoPreprocessing(AbstractExecutionContextDispatcher.java:150)
at com.sap.tc.webdynpro.serverimpl.wdc.sessionctx.DispatchHandlerForAppPreprocessing.doService(DispatchHandlerForAppPreprocessing.java:35)
at com.sap.tc.webdynpro.serverimpl.wdc.sessionctx.AbstractDispatchHandler.service(AbstractDispatchHandler.java:116)
at com.sap.engine.services.servlets_jsp.server.deploy.impl.module.IRequestDispatcherImpl.dispatch(IRequestDispatcherImpl.java:93)
at com.sap.tc.webdynpro.serverimpl.wdc.sessionctx.ExecutionContextDispatcher.dispatchToApplicationDoPreprocessing(ExecutionContextDispatcher.java:100)
at com.sap.tc.webdynpro.serverimpl.core.sessionctx.AbstractExecutionContextDispatcher.dispatch(AbstractExecutionContextDispatcher.java:75)
at com.sap.tc.webdynpro.clientserver.session.ApplicationSession.dispatch(ApplicationSession.java:507)
at com.sap.tc.webdynpro.clientserver.session.ApplicationSession.dispatch(ApplicationSession.java:527)
at com.sap.tc.webdynpro.clientserver.session.ApplicationSession.doPreprocessing(ApplicationSession.java:233)
at com.sap.tc.webdynpro.clientserver.session.ClientSession.doPreprocessing(ClientSession.java:647)
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