Not able to schedule a task using Scheduler API

[Former Member]

Hi Experts,

We have a client requirement in which we have to schedule tasks by using Scheduler APIs ( com.sap.scheduler.api ).
I am able to create a task successfully by passing the required parameters, but when i try to schedule that created task I get a NullPointerException.

Please find below the trace for the same :

java.lang.NullPointerException at com.sap.engine.services.scheduler.runtime.JobParameterVerifyer.verifyParameters(JobParameterVerifyer.java:77) at com.sap.engine.services.scheduler.runtime.JobExecutionRuntimeImpl.verifyParameters(JobExecutionRuntimeImpl.java:682) at com.sap.engine.services.scheduler.runtime.RuntimeIntfAccessAsserter.verifyParameters(RuntimeIntfAccessAsserter.java:385) at com.sap.engine.services.scheduler.impl.Scheduler.schedule(Scheduler.java:559) at com.sap.engine.services.scheduler.impl.FunctionalSingletonImpl.schedule(FunctionalSingletonImpl.java:145) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at com.sap.engine.services.rmi_p4.reflect.LocalInvocationHandler.invokeInternal(LocalInvocationHandler.java:99) at com.sap.engine.services.rmi_p4.reflect.AbstractInvocationHandler.invoke(AbstractInvocationHandler.java:52) at $Proxy175.schedule(Unknown Source) at com.sap.engine.services.scheduler.impl.ServiceInterfaceDelegate.schedule(ServiceInterfaceDelegate.java:200) at com.sap.tc.webdynpro.progmodel.generation.DelegatingView.invokeEventHandler(DelegatingView.java:142) at com.sap.tc.webdynpro.progmodel.controller.Action.fire(Action.java:75) at com.sap.tc.webdynpro.clientserver.phases.ProcessingEventPhase.doHandleActionEvent(ProcessingEventPhase.java:159) at com.sap.tc.webdynpro.clientserver.phases.ProcessingEventPhase.execute(ProcessingEventPhase.java:94) at com.sap.tc.webdynpro.clientserver.window.WindowPhaseModel.processRequestPartly(WindowPhaseModel.java:162) at com.sap.tc.webdynpro.clientserver.window.WindowPhaseModel.doProcessRequest(WindowPhaseModel.java:110) at com.sap.tc.webdynpro.clientserver.window.WindowPhaseModel.processRequest(WindowPhaseModel.java:97) at com.sap.tc.webdynpro.clientserver.window.WebDynproWindow.processRequest(WebDynproWindow.java:514) at com.sap.tc.webdynpro.clientserver.cal.AbstractClient.executeTasks(AbstractClient.java:55) at com.sap.tc.webdynpro.clientserver.cal.ClientApplication.doExecute(ClientApplication.java:1689) at com.sap.tc.webdynpro.clientserver.cal.ClientApplication.doProcessing(ClientApplication.java:1503) at com.sap.tc.webdynpro.clientserver.session.ApplicationSession.doApplicationProcessingEmbedded(ApplicationSession.java:918) at com.sap.tc.webdynpro.clientserver.session.ApplicationSession.doApplicationProcessing(ApplicationSession.java:877) at com.sap.tc.webdynpro.clientserver.session.ApplicationSession.doProcessing(ApplicationSession.java:358) at com.sap.tc.webdynpro.clientserver.session.RequestManager.doProcessing(RequestManager.java:330) at com.sap.tc.webdynpro.serverimpl.core.sessionctx.AbstractExecutionContextDispatcher.delegateToRequestManager(AbstractExecutionContextDispatcher.java:62) at com.sap.tc.webdynpro.serverimpl.wdc.sessionctx.DispatchHandlerForRequestManager.service(DispatchHandlerForRequestManager.java:39) at com.sap.tc.webdynpro.serverimpl.wdc.sessionctx.DispatchHandlerForRequestManager.service(DispatchHandlerForRequestManager.java:46) at com.sap.engine.services.servlets_jsp.server.deploy.impl.module.IRequestDispatcherImpl.dispatch(IRequestDispatcherImpl.java:270) at com.sap.tc.webdynpro.serverimpl.wdc.sessionctx.ExecutionContextDispatcher.dispatchToAppContext(ExecutionContextDispatcher.java:68) at com.sap.tc.webdynpro.serverimpl.core.sessionctx.AbstractExecutionContextDispatcher.dispatch(AbstractExecutionContextDispatcher.java:53) at com.sap.tc.webdynpro.clientserver.session.RequestManager.doProcessing(RequestManager.java:246) at com.sap.tc.webdynpro.clientserver.embedding.JavaApplicationProxy$Runner.callRequestManager(JavaApplicationProxy.java:1265) at com.sap.tc.webdynpro.clientserver.embedding.JavaApplicationProxy$Runner.callEmbeddedApplication(JavaApplicationProxy.java:1146) at com.sap.tc.webdynpro.clientserver.embedding.JavaApplicationProxy$SendDataAndProcessActionCommand.doExecute(JavaApplicationProxy.java:1582) at com.sap.tc.webdynpro.clientserver.embedding.JavaApplicationProxy$AbstractCommand.execute(JavaApplicationProxy.java:1465) at com.sap.tc.webdynpro.clientserver.embedding.JavaApplicationProxy$Runner.execute(JavaApplicationProxy.java:1052) at com.sap.tc.webdynpro.clientserver.embedding.JavaApplicationProxy.execute(JavaApplicationProxy.java:883) at com.sap.tc.webdynpro.clientserver.embedding.JavaApplicationProxy.sendDataAndProcessAction(JavaApplicationProxy.java:492) at com.sap.tc.webdynpro.portal.pb.impl.JavaApplicationProxyAdapter.sendDataAndProcessAction(JavaApplicationProxyAdapter.java:191) at com.sap.portal.pb.PageBuilder.updateApplications(PageBuilder.java:1667) at com.sap.portal.pb.PageBuilder.SendDataAndProcessAction(PageBuilder.java:367) at com.sap.portal.pb.PageBuilder$PhaseListenerImpl.doPhase(PageBuilder.java:2083) at com.sap.tc.webdynpro.clientserver.window.WindowPhaseModel.processPhaseListener(WindowPhaseModel.java:251) at com.sap.tc.webdynpro.clientserver.phases.PortalDispatchPhase.execute(PortalDispatchPhase.java:50) at com.sap.tc.webdynpro.clientserver.window.WindowPhaseModel.processRequestPartly(WindowPhaseModel.java:162) at com.sap.tc.webdynpro.clientserver.window.WindowPhaseModel.doProcessRequest(WindowPhaseModel.java:110) at com.sap.tc.webdynpro.clientserver.window.WindowPhaseModel.processRequest(WindowPhaseModel.java:97) at com.sap.tc.webdynpro.clientserver.window.WebDynproWindow.processRequest(WebDynproWindow.java:514) at com.sap.tc.webdynpro.clientserver.cal.AbstractClient.executeTasks(AbstractClient.java:55) at com.sap.tc.webdynpro.clientserver.cal.ClientApplication.doExecute(ClientApplication.java:1689) at com.sap.tc.webdynpro.clientserver.cal.ClientApplication.doProcessing(ClientApplication.java:1503) at com.sap.tc.webdynpro.clientserver.session.ApplicationSession.doApplicationProcessingStandalone(ApplicationSession.java:907) at com.sap.tc.webdynpro.clientserver.session.ApplicationSession.doApplicationProcessing(ApplicationSession.java:879) at com.sap.tc.webdynpro.clientserver.session.ApplicationSession.doProcessing(ApplicationSession.java:358) at com.sap.tc.webdynpro.clientserver.session.RequestManager.doProcessing(RequestManager.java:330) at com.sap.tc.webdynpro.serverimpl.core.AbstractDispatcherServlet.doContent(AbstractDispatcherServlet.java:87) at com.sap.tc.webdynpro.serverimpl.wdc.DispatcherServlet.doContent(DispatcherServlet.java:89) at com.sap.tc.webdynpro.serverimpl.core.AbstractDispatcherServlet.doPost(AbstractDispatcherServlet.java:62) at javax.servlet.http.HttpServlet.service(HttpServlet.java:754) at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) at com.sap.engine.services.servlets_jsp.server.Invokable.invoke(Invokable.java:152) at com.sap.engine.services.servlets_jsp.server.Invokable.invoke(Invokable.java:38) at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:404) at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:204) at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:440) at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:429) at com.sap.engine.services.servlets_jsp.filters.DSRWebContainerFilter.process(DSRWebContainerFilter.java:38) at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:78) at com.sap.engine.services.servlets_jsp.filters.ServletSelector.process(ServletSelector.java:82) at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:78) at com.sap.engine.services.servlets_jsp.filters.ApplicationSelector.process(ApplicationSelector.java:268) at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:78) at com.sap.engine.services.httpserver.filters.WebContainerInvoker.process(WebContainerInvoker.java:81) at com.sap.engine.services.httpserver.chain.HostFilter.process(HostFilter.java:9) at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:78) 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:78) 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:78) 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:78) at com.sap.engine.services.httpserver.filters.MemoryStatisticFilter.process(MemoryStatisticFilter.java:54) at com.sap.engine.services.httpserver.chain.ServerFilter.process(ServerFilter.java:12) at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:78) at com.sap.engine.services.httpserver.filters.DSRHttpFilter.process(DSRHttpFilter.java:42) at com.sap.engine.services.httpserver.chain.ServerFilter.process(ServerFilter.java:12) at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:78) at com.sap.engine.services.httpserver.server.Processor.chainedRequest(Processor.java:447) at com.sap.engine.services.httpserver.server.Processor$FCAProcessorThread.process(Processor.java:264) at com.sap.engine.services.httpserver.server.rcm.RequestProcessorThread.run(RequestProcessorThread.java:56) at com.sap.engine.core.thread.execution.Executable.run(Executable.java:122) at com.sap.engine.core.thread.execution.Executable.run(Executable.java:101) at com.sap.engine.core.thread.execution.CentralExecutor$SingleThread.run(CentralExecutor.java:328)

Any idea on what is going wrong in using the API or any other mistake that possibly I could have done?

Regards,
Harshada

[Former Member · Accepted solution]

There was some mistake happening  in parameter mapping while scheduling the task.
The problem was solved after correcting it.

- Harshada

[junwu]

code, and what doc you followed