Fatal error when updating Payload with Java hw Worklist API

Question

Hi all,
I am receiving an error when I want to update some non-String-type fields
of a task payload. I access the fields in the payload with facade-classes, generated by Schemac.
The fact is that I can read all the payload fields, but when I try to set values in non-String typed fields of the payload I'm getting a run-time error:
java.lang.NullPointerException at EDU.oswego.cs.dl.util.concurrent.ConcurrentReaderHashMap.hash(ConcurrentReaderHashMap.java:308) at EDU.oswego.cs.dl.util.concurrent.ConcurrentReaderHashMap.get(ConcurrentReaderHashMap.java:427) at org.collaxa.thirdparty.dom4j.tree.NamespaceCache.get(NamespaceCache.java:82) at org.collaxa.thirdparty.dom4j.Namespace.get(Namespace.java:60) at com.collaxa.cube.xml.dom.DOMUtil.createElement(DOMUtil.java:382) at com.collaxa.cube.xml.dom.DOMUtil.createElement(DOMUtil.java:350) at com.collaxa.cube.xml.BaseFacade.setChildElementValue(BaseFacade.java:323) at nl.nak.www.ns.vocht.Userpayload.setAge(Userpayload.java:327) at nl.nak.gui.action.ProcessTaskAction.execute(ProcessTaskAction.java:107) at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484) at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274) at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482) at nl.nak.gui.custom.CustomActionServlet.process(CustomActionServlet.java:35) at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525) at javax.servlet.http.HttpServlet.service(HttpServlet.java:760) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:810) at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:322) at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:790) at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:270) at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:112) at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:192) at java.lang.Thread.run(Thread.java:534)
My XSD file for the payload looks like this:
<schema xmlns="http://www.w3.org/2001/XMLSchema" targetNamespace="http://www.comp.nl/ns/vocht"
     xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:tns="http://www.comp.nl/ns/vocht">
<element name="userpayload">
<complexType>
<sequence>
<element name="name" type="xsd:string" />
<element name="lastname" type="xsd:string" />
<element name="age" type="xsd:int" />
<element name="amount" type="xsd:decimal"
</complexType>
</element>
</schema>
The code where I make a connection to the
WorkList service and how I retrieve the payload is listed below.
Note that a specific task is set in the Session at in a previous step:
try{
String user="jcooper";
String password="welcome";
//maak een verbinding
RemoteWorklistServiceClient client = new RemoteWorklistServiceClient();
client.init();
out.println("connectie geinitialiseerd");
//authenticatie
IWorklistContext ctx = client.authenticateUser(user, password);
Userpayload ut = (Userpayload) UserpayloadFactory.createFacade(payload);
ut.setName("tom");
ut.setLastname("Cooper");
//EXCEPTION THROWN HERE
ut.setAge(1);
ut.setAmount(new BigDecimal(2));
taak.setPayload(ut.getRootElement());
String action = "DONE";
client.customTaskOperation(ctx, taak.getTaskId(), action);
out.println("taak geapproved :: "+payload.toString())
return null;
catch(Exception e)
//PRINT DEBUG INFORMATIE
e.printStackTrace(new PrintWriter(out));
sp.addActionError(errors,"nl.nak.view.standaard.errors.system",null);
saveErrors(request,errors);
return null; //mapping.findForward("failure");
At run-time the null-pointer exception is thrown when the Age field is set.
Can anynone help me with this problem?
Thanks in advance!
Tom Hofte
Message was edited by:
[email protected]

Answer 1

If it is a stored procedure, the action should be EXECUTE and not UPDATE and the structure should be similar to this:
<StatementName5>
<storedProcedureName action=u201D EXECUTEu201D>
    <table>realStoredProcedureeName</table>
<param1 [isInput=u201Dtrueu201D] [isOutput=true] type=SQLDatatype>val1</param1>
</storedProcedureName > 
  </StatementName5>
From help.sap
Regards,
Prateek