Constantine Kulak [http://community.jboss.org/people/ity75303] created the discussion
"How to check in jBPM 4.3 that java activity returned null?" To view the discussion, visit: http://community.jboss.org/message/554156#554156 -------------------------------------------------------------- Hello, is there any way to store null value in a variable and then check it for being empty? I'm trying to do it like this: <java method="someMethod" name="Java" var="variable"> <transition to="Decision" /> </java> <decision name="Decision"> <transition to="Variable is empty"> <condition expr="#{empty variable}" /> </transition> <transition to="Default" /> </decision> here xxx.Test.someMethod returns null, and +decision+ throws an exception: org.jbpm.api.JbpmException: script evaluation error: javax.el.PropertyNotFoundException: Cannot find property variable org.jbpm.pvm.internal.script.ScriptManager.evaluate(ScriptManager.java:130) org.jbpm.pvm.internal.script.ScriptManager.evaluate(ScriptManager.java:118) org.jbpm.pvm.internal.script.ScriptManager.evaluateExpression(ScriptManager.java:90) org.jbpm.pvm.internal.model.ExpressionCondition.evaluate(ExpressionCondition.java:41) org.jbpm.jpdl.internal.activity.DecisionConditionActivity.findTransitionUsingConditions(DecisionConditionActivity.java:61) org.jbpm.jpdl.internal.activity.DecisionConditionActivity.execute(DecisionConditionActivity.java:46) org.jbpm.jpdl.internal.activity.DecisionConditionActivity.execute(DecisionConditionActivity.java:42) org.jbpm.pvm.internal.model.op.ExecuteActivity.perform(ExecuteActivity.java:60) org.jbpm.pvm.internal.model.ExecutionImpl.performAtomicOperationSync(ExecutionImpl.java:656) org.jbpm.pvm.internal.model.ExecutionImpl.performAtomicOperation(ExecutionImpl.java:616) org.jbpm.pvm.internal.model.ExecutionImpl.start(ExecutionImpl.java:217) org.jbpm.pvm.internal.cmd.StartProcessInstanceCmd.execute(StartProcessInstanceCmd.java:61) org.jbpm.pvm.internal.cmd.StartProcessInstanceCmd.execute(StartProcessInstanceCmd.java:37) org.jbpm.pvm.internal.svc.DefaultCommandService.execute(DefaultCommandService.java:42) org.jbpm.pvm.internal.tx.StandardTransactionInterceptor.execute(StandardTransactionInterceptor.java:54) org.jbpm.pvm.internal.svc.EnvironmentInterceptor.executeInNewEnvironment(EnvironmentInterceptor.java:53) org.jbpm.pvm.internal.svc.EnvironmentInterceptor.execute(EnvironmentInterceptor.java:40) org.jbpm.pvm.internal.svc.RetryInterceptor.execute(RetryInterceptor.java:55) org.jbpm.pvm.internal.svc.SkipInterceptor.execute(SkipInterceptor.java:43) org.jbpm.pvm.internal.svc.ExecutionServiceImpl.startProcessInstanceById(ExecutionServiceImpl.java:58) org.jbpm.integration.console.ProcessManagementImpl.newInstance(ProcessManagementImpl.java:151) org.jboss.bpm.console.server.FormProcessingFacade.startProcessWithUI(FormProcessingFacade.java:202) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) java.lang.reflect.Method.invoke(Method.java:597) org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:117) org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:260) org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:232) org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:166) org.jboss.resteasy.core.DispatcherUtilities.getJaxrsResponse(DispatcherUtilities.java:142) org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:356) org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:173) org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:93) org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:68) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) org.jboss.bpm.console.server.util.GWTJsonFilter.doFilter(GWTJsonFilter.java:59) So I guess it doesn't create a variable if null is returned. To overcome this I'm returning List instead of a single object and check whether it is empty or not, but it looks ugly. Is there any better way to check for null values returned by +java+ activity? Thanks in advance for your suggestions. -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/554156#554156] Start a new discussion in jBPM at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&containerType=14&container=2034]
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