Creating Java Service Task dynamically

mashrur — Mon, 09 Jun 2014 10:35:35 GMT

We would like to give facility to our application users to create activiti workflow. To achieve this, I am trying to use code from the below article:http://stacktrace.be/blog/2013/03/dynamic-process-creation-and-deployment-in-100-lines/or,https://github.com/sunnydyal/workflow/blob/master/workflow/sr

Re: Creating Java Service Task dynamically

mashrur — Mon, 09 Jun 2014 10:59:20 GMT

There was some obvious problems in the code. I fixed those. Changed the id while creating service task:

protected FlowElement createServiceTask(String name){
ServiceTask stask = new ServiceTask();
stask.setId("sid");
stask.setName(name);
stask.setImplementation("activitiTest.PrintVariables");
return stask;
}

And modified the element creation flow accordingly:
process.addFlowElement(createStartEvent());
process.addFlowElement(createUserTask("task1", "First task", "fred"));
process.addFlowElement(createUserTask("task2", "Second task", "john"));
process.addFlowElement(createServiceTask("sampleservice"));
process.addFlowElement(createEndEvent());

process.addFlowElement(createSequenceFlow("start", "task1"));
process.addFlowElement(createSequenceFlow("task1", "task2"));
process.addFlowElement(createSequenceFlow("task2", "sid"));
process.addFlowElement(createSequenceFlow("sid", "end"));

Now, I am getting this:
org.activiti.engine.ActivitiException: Errors while parsing:
One of the attributes 'class', 'delegateExpression', 'type', 'operation', or 'expression' is mandatory on serviceTask. | sid | line 7 | column 48

at org.activiti.engine.impl.bpmn.parser.BpmnParse.execute(BpmnParse.java:205)
at org.activiti.engine.impl.bpmn.deployer.BpmnDeployer.deploy(BpmnDeployer.java:86)
at org.activiti.engine.impl.persistence.deploy.DeploymentManager.deploy(DeploymentManager.java:42)
at org.activiti.engine.impl.cmd.DeployCmd.execute(DeployCmd.java:68)
at org.activiti.engine.impl.cmd.DeployCmd.execute(DeployCmd.java:33)
at org.activiti.engine.impl.interceptor.CommandInvoker.execute(CommandInvoker.java:24)
at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:57)
at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:31)
at org.activiti.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:40)
at org.activiti.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:35)
at org.activiti.engine.impl.RepositoryServiceImpl.deploy(RepositoryServiceImpl.java:75)
at org.activiti.engine.impl.repository.DeploymentBuilderImpl.deploy(DeploymentBuilderImpl.java:139)
at activitiTest.DynamicFlowCreation.testDynamicDeploy(DynamicFlowCreation.java:59)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.activiti.engine.test.ActivitiRule$1.evaluate(ActivitiRule.java:124)
at org.junit.rules.RunRules.evaluate(RunRules.java:20)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

Re: Creating Java Service Task dynamically

mashrur — Mon, 09 Jun 2014 11:42:04 GMT

Got it. I had to set implementationType :
String implementationType = ImplementationType.IMPLEMENTATION_TYPE_DELEGATEEXPRESSION;
stask.setImplementationType(implementationType );

Re: Creating Java Service Task dynamically

chiranjeeviveer — Tue, 31 Oct 2017 13:59:29 GMT

Hi mashrur,

Am facing some issue while creating service task dynamically. Can you please help me with this issue.

org.activiti.engine.ActivitiObjectNotFoundException: no processes deployed with key 'my-process' .

Its not creating the entry in ACT_RE_DEPLOYMENT deployment table. Because of which this error.

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