Bug 1032206 - NPE when accessing tasks using a RuntimeEngine without persistence.
NPE when accessing tasks using a RuntimeEngine without persistence.
Product: JBoss BPMS Platform 6
Classification: JBoss
Component: jBPM Core (Show other bugs)
Unspecified Unspecified
high Severity medium
: ER6
: 6.0.0
Assigned To: Maciej Swiderski
Jiri Svitak
Depends On:
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Reported: 2013-11-19 12:32 EST by Marek Baluch
Modified: 2015-06-01 21:35 EDT (History)
2 users (show)

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2014-08-06 16:06:52 EDT
Type: Bug
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RHEL 7.3 requirements from Atomic Host:
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Description Marek Baluch 2013-11-19 12:32:54 EST
Description of problem:

Following code will throw NPE when ts.getTasksByProcessInstance(pi.getId()); is called.

public class JbpmExecutor {

    public RuntimeEngine newRuntime(String... processes) throws Exception {
        RuntimeEnvironmentBuilder builder = RuntimeEnvironmentBuilder.getEmpty()
                .addConfiguration("drools.processSignalManagerFactory", DefaultSignalManagerFactory.class.getName())
                .addConfiguration("drools.processInstanceManagerFactory", DefaultProcessInstanceManagerFactory.class.getName());
        for (String process : processes) {
        	builder.addAsset(ResourceFactory.newClassPathResource(process), ResourceType.BPMN2);
//        for (String ruleFile : ruleFiles) {
//            builder.addAsset(ResourceFactory.newClassPathResource(ruleFile), ResourceType.DRL);
//        }
        RuntimeManager manager = RuntimeManagerFactory.Factory.get().newSingletonRuntimeManager(builder.get(), "Singleton " + UUID.randomUUID().toString());
        RuntimeEngine runtime = manager.getRuntimeEngine(EmptyContext.get());
        return runtime;

    public static void main(String ... args) throws Exception {
		JbpmExecutor executor = new JbpmExecutor();
		RuntimeEngine runtime = executor.newRuntime("xxx.bpmn2");
		ProcessInstance pi = runtime.getKieSession().startProcess("BPMN2IntermediateThrowEscalationEvent");
		System.out.println(pi.getState() == ProcessInstance.STATE_COMPLETED);
		TaskService ts = runtime.getTaskService();
		// Throws NPE. I would consider this a bug which is not yet reported. 
Comment 1 Maciej Swiderski 2013-11-20 05:19:43 EST

that is sort of expected behavior as you don't configure task service and thus it's not available. You use Empty builder which means you need to setup everything manually, while you could use DefaultInMemory to have task service configured and process engine in memory only.
The improvement we could apply here is that it shall throw an exception on getTaskService method when it is not configured with meaningful message instead of NPE.

Comment 2 Marek Baluch 2013-11-20 08:33:10 EST

I believe that would be a fitting solution. Something like UnsupportedOperationException with a message explaining why it's not supported.

Comment 3 Maciej Swiderski 2013-11-21 05:34:15 EST
alright, exception is now thrown in case task service is not configured to avoid further NPE.


Comment 4 Jiri Svitak 2014-01-03 06:57:14 EST
Verified in BPMS 6 ER7 (6.0.1-redhat-2).

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