[jboss-user] [jBPM] - Instantiation of org.drools.concurrent.ExecutorProviderImpl in OSGi
Tomasz Kleszczyński
do-not-reply at jboss.com
Tue Sep 11 07:47:27 EDT 2012
Tomasz Kleszczyński [https://community.jboss.org/people/tkleszczynski] created the discussion
"Instantiation of org.drools.concurrent.ExecutorProviderImpl in OSGi"
To view the discussion, visit: https://community.jboss.org/message/758994#758994
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Hello everybody,
I've prepared simple process which uses some rules. There is small problem during invocation - one of class cannot be loaded correctly. I found the same problem in http://lists.jboss.org/pipermail/rules-users/2012-May/026839.html http://lists.jboss.org/pipermail/rules-users/2012-May/026839.html but in that thread there was not correct solution
During invocation on OSGi environment I've got following problem:
1. org.drools.concurrent.ExecutorProviderFactory$ExecutorProviderHolder tries to obtain instance of class org.drools.concurrent.ExecutorProvider using org.drools.util.ServiceRegistryImpl.get method
2. org.drools.util.ServiceRegistryImpl doesn't have any implementation of org.drools.concurrent.ExecutorProvider in it's registry
3. org.drools.util.ServiceRegistryImpl tries to instantiate default implementation - org.drools.concurrent.ExecutorProviderImpl using org.drools.util.ServiceRegistryImpl$ReflectionInstantiator using wrong classloader - in my opinion there is problem.
4. Finally java.lang.ClassNotFoundException: org.drools.concurrent.ExecutorProviderImpl is thrown because classloader from bundle knowledge-api-5.4.0.Final cannot load class org.drools.concurrent.ExecutorProviderImpl.
This type of problems in OSGi environment were solved by registering proper instances in OSGi service repository. For example for core module in org.drools.osgi.core.Activator class. Maybe would be worth to register also org.drools.concurrent.ExecutorProviderImpl as OSGi service. I've tried to fix this problem this and this way solves this problem.
Stacktrace I've got in this situation.
SEVERE: Unable to start blueprint container for bundle jbpm5-example-client
org.osgi.service.blueprint.container.ComponentDefinitionException: Unable to intialize bean sampleProcessClient
at org.apache.aries.blueprint.container.BeanRecipe.runBeanProcInit(BeanRecipe.java:710)
at org.apache.aries.blueprint.container.BeanRecipe.internalCreate2(BeanRecipe.java:820)
at org.apache.aries.blueprint.container.BeanRecipe.internalCreate(BeanRecipe.java:783)
at org.apache.aries.blueprint.di.AbstractRecipe$1.call(AbstractRecipe.java:79)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at org.apache.aries.blueprint.di.AbstractRecipe.create(AbstractRecipe.java:88)
at org.apache.aries.blueprint.container.BlueprintRepository.createInstances(BlueprintRepository.java:245)
at org.apache.aries.blueprint.container.BlueprintRepository.createAll(BlueprintRepository.java:183)
at org.apache.aries.blueprint.container.BlueprintContainerImpl.instantiateEagerComponents(BlueprintContainerImpl.java:648)
at org.apache.aries.blueprint.container.BlueprintContainerImpl.doRun(BlueprintContainerImpl.java:340)
at org.apache.aries.blueprint.container.BlueprintContainerImpl.run(BlueprintContainerImpl.java:242)
at org.apache.aries.blueprint.utils.threading.impl.DiscardableRunnable.run(DiscardableRunnable.java:48)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:98)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:206)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.ExceptionInInitializerError
at org.drools.concurrent.ExecutorProviderFactory.getExecutorProvider(ExecutorProviderFactory.java:12)
at org.drools.rule.constraint.MvelConstraint$ExecutorHolder.<clinit>(MvelConstraint.java:208)
at org.drools.rule.constraint.MvelConstraint.jitEvaluator(MvelConstraint.java:199)
at org.drools.rule.constraint.MvelConstraint.evaluate(MvelConstraint.java:164)
at org.drools.rule.constraint.MvelConstraint.isAllowed(MvelConstraint.java:124)
at org.drools.reteoo.AlphaNode.modifyObject(AlphaNode.java:154)
at org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateModifyObject(CompositeObjectSinkAdapter.java:507)
at org.drools.reteoo.CompositeObjectSinkAdapter.propagateModifyObject(CompositeObjectSinkAdapter.java:432)
at org.drools.reteoo.ObjectTypeNode.modifyObject(ObjectTypeNode.java:314)
at org.drools.reteoo.EntryPointNode.modifyObject(EntryPointNode.java:265)
at org.drools.common.NamedEntryPoint.update(NamedEntryPoint.java:470)
at org.drools.common.NamedEntryPoint.update(NamedEntryPoint.java:370)
at org.drools.base.DefaultKnowledgeHelper.update(DefaultKnowledgeHelper.java:317)
at org.drools.base.DefaultKnowledgeHelper.update(DefaultKnowledgeHelper.java:312)
at org.foo.jbpm5.drools.rules.pricing.Rule_Pricing_based_on_demand____Used_AUDI_70__of_the_original_price_77e52c0333d54b068cd3bc5e98c79344.defaultConsequence(Rule_Pricing_based_on_demand____Used_AUDI_70__of_the_original_price_77e52c0333d54b068cd3bc5e98c79344.java:8)
at org.foo.jbpm5.drools.rules.pricing.Rule_Pricing_based_on_demand____Used_AUDI_70__of_the_original_price_77e52c0333d54b068cd3bc5e98c79344DefaultConsequenceInvokerGenerated.evaluate(Unknown Source)
at org.foo.jbpm5.drools.rules.pricing.Rule_Pricing_based_on_demand____Used_AUDI_70__of_the_original_price_77e52c0333d54b068cd3bc5e98c79344DefaultConsequenceInvoker.evaluate(Unknown Source)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1273)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1209)
at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1442)
at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:710)
at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:674)
at org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:230)
at org.drools.impl.StatelessKnowledgeSessionImpl.execute(StatelessKnowledgeSessionImpl.java:295)
at org.foo.jbpm5.drools.DefineCarPriceWorkItemHandler.executeWorkItem(DefineCarPriceWorkItemHandler.java:24)
at org.drools.process.instance.impl.DefaultWorkItemManager.internalExecuteWorkItem(DefaultWorkItemManager.java:70)
at org.jbpm.workflow.instance.node.WorkItemNodeInstance.internalTrigger(WorkItemNodeInstance.java:105)
at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:124)
at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerNodeInstance(NodeInstanceImpl.java:205)
at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:164)
at org.jbpm.workflow.instance.impl.ExtendedNodeInstanceImpl.triggerCompleted(ExtendedNodeInstanceImpl.java:47)
at org.jbpm.workflow.instance.node.StateBasedNodeInstance.triggerCompleted(StateBasedNodeInstance.java:162)
at org.jbpm.workflow.instance.node.StateBasedNodeInstance.triggerCompleted(StateBasedNodeInstance.java:143)
at org.jbpm.workflow.instance.node.WorkItemNodeInstance.triggerCompleted(WorkItemNodeInstance.java:239)
at org.jbpm.workflow.instance.node.WorkItemNodeInstance.workItemCompleted(WorkItemNodeInstance.java:301)
at org.jbpm.workflow.instance.node.WorkItemNodeInstance.signalEvent(WorkItemNodeInstance.java:277)
at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.signalEvent(WorkflowProcessInstanceImpl.java:326)
at org.drools.process.instance.impl.DefaultWorkItemManager.completeWorkItem(DefaultWorkItemManager.java:116)
at org.foo.jbpm5.drools.RankCarWorkItemHandler.executeWorkItem(RankCarWorkItemHandler.java:27)
at org.drools.process.instance.impl.DefaultWorkItemManager.internalExecuteWorkItem(DefaultWorkItemManager.java:70)
at org.jbpm.workflow.instance.node.WorkItemNodeInstance.internalTrigger(WorkItemNodeInstance.java:105)
at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:124)
at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerNodeInstance(NodeInstanceImpl.java:205)
at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:164)
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:124)
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:303)
at org.jbpm.process.instance.ProcessRuntimeImpl.startProcessInstance(ProcessRuntimeImpl.java:168)
at org.drools.common.AbstractWorkingMemory.startProcessInstance(AbstractWorkingMemory.java:1092)
at org.drools.impl.StatefulKnowledgeSessionImpl.startProcessInstance(StatefulKnowledgeSessionImpl.java:330)
at org.foo.jbpm5.example.client.SampleProcessClient.startStatelessDroolsEvaluation(SampleProcessClient.java:59)
at org.foo.jbpm5.example.client.SampleProcessClient.init(SampleProcessClient.java:48)
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 org.apache.aries.blueprint.utils.ReflectionUtils.invoke(ReflectionUtils.java:238)
at org.apache.aries.blueprint.container.BeanRecipe.invoke(BeanRecipe.java:954)
at org.apache.aries.blueprint.container.BeanRecipe.runBeanProcInit(BeanRecipe.java:708)
... 20 more
Caused by: java.lang.IllegalArgumentException: Unable to instantiate service for Class 'org.drools.concurrent.ExecutorProvider'
at org.drools.util.ServiceRegistryImpl.get(ServiceRegistryImpl.java:162)
at org.drools.concurrent.ExecutorProviderFactory$ExecutorProviderHolder.<clinit>(ExecutorProviderFactory.java:8)
... 82 more
Caused by: java.lang.IllegalArgumentException: Unable to instantiate 'org.drools.concurrent.ExecutorProviderImpl'
at org.drools.util.ServiceRegistryImpl$ReflectionInstantiator.newInstance(ServiceRegistryImpl.java:213)
at org.drools.util.ServiceRegistryImpl$ReflectionInstantiator.call(ServiceRegistryImpl.java:205)
at org.drools.util.ServiceRegistryImpl.get(ServiceRegistryImpl.java:160)
... 83 more
Caused by: java.lang.ClassNotFoundException: org.drools.concurrent.ExecutorProviderImpl
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:513)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:429)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:417)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:169)
at org.drools.util.ServiceRegistryImpl$ReflectionInstantiator.newInstance(ServiceRegistryImpl.java:210)
... 85 more
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