[jboss-dev-forums] [jBPM Development] - Creating process dynamically using Fluent API

[Sanket Mohile]

Sanket Mohile [http://community.jboss.org/people/sanket.mohile] created the discussion

"Creating process dynamically using Fluent API"

To view the discussion, visit: http://community.jboss.org/message/640100#640100

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Hi,
I want to create a process dynamically using Fluent API.
I tried this - 

RuleFlowProcessFactory factory = RuleFlowProcessFactory.createProcess("com.sample.process");

   factory
    // Header
    .name("HelloWorldProcess")
    .version("1.0")
    .packageName("defaultPackage")
    // Nodes
    .startNode(1)
     .name("Start")
    .done()
    .actionNode(2)
     .name("Action")
     .action("java", "System.out.println(\"Hello World\");")
    .done().
    endNode(3)
     .name("End")
    .done()
    // Connections
    .connection(1, 2)
    .connection(2, 3);

But when I start the process, I get an exception

java.lang.RuntimeException: unable to execute Action
 at org.jbpm.workflow.instance.node.ActionNodeInstance.internalTrigger(ActionNodeInstance.java:49)
 at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:122)
 at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerConnection(NodeInstanceImpl.java:185)
 at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:150)
 at org.jbpm.workflow.instance.node.StartNodeInstance.triggerCompleted(StartNodeInstance.java:49)
 at org.jbpm.workflow.instance.node.StartNodeInstance.internalTrigger(StartNodeInstance.java:41)
 at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:122)
 at org.jbpm.ruleflow.instance.RuleFlowProcessInstance.internalStart(RuleFlowProcessInstance.java:35)
 at org.jbpm.process.instance.impl.ProcessInstanceImpl.start(ProcessInstanceImpl.java:188)
 at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.start(WorkflowProcessInstanceImpl.java:302)
 at org.jbpm.process.instance.ProcessRuntimeImpl.startProcessInstance(ProcessRuntimeImpl.java:154)
 at org.jbpm.process.instance.ProcessRuntimeImpl.startProcess(ProcessRuntimeImpl.java:124)
 at org.jbpm.process.instance.ProcessRuntimeImpl.startProcess(ProcessRuntimeImpl.java:116)
 at org.drools.common.AbstractWorkingMemory.startProcess(AbstractWorkingMemory.java:1090)
 at org.drools.impl.StatefulKnowledgeSessionImpl.startProcess(StatefulKnowledgeSessionImpl.java:301)
 at com.sample.Example1.main(Example1.java:57)
Caused by: java.lang.NullPointerException
 at org.jbpm.workflow.instance.node.ActionNodeInstance.internalTrigger(ActionNodeInstance.java:47)
 ... 15 more

If I remove the actionNode, the code runs successfully.
Similarly in case of a human task node, when I use a .onEntryAction("java", "java.util.Map contentParam = new java.util.HashMap();"); it crashes.
Seems some problem with the "java" dialect. Just not able to figure that out...

Please help.
Also would be glad if someone could provide a sample code for creating dynamic process with fluent API..

Thanks,
Sanket.
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