In Workflow getting failed with below InternalWorkflowTaskException

Community Support
,
1 
{
  "message": "Failure handling event 4 of type 'EVENT_TYPE_WORKFLOW_TASK_STARTED' during execution. {WorkflowTaskStartedEventId=4, CurrentStartedEventId=4}",
  "source": "JavaSDK",
  "stackTrace": "io.temporal.internal.statemachines.WorkflowStateMachines.createEventProcessingException(WorkflowStateMachines.java:314)\nio.temporal.internal.statemachines.WorkflowStateMachines.handleEventsBatch(WorkflowStateMachines.java:275)\nio.temporal.internal.statemachines.WorkflowStateMachines.handleEvent(WorkflowStateMachines.java:221)\nio.temporal.internal.replay.ReplayWorkflowRunTaskHandler.applyServerHistory(ReplayWorkflowRunTaskHandler.java:234)\nio.temporal.internal.replay.ReplayWorkflowRunTaskHandler.handleWorkflowTaskImpl(ReplayWorkflowRunTaskHandler.java:218)\nio.temporal.internal.replay.ReplayWorkflowRunTaskHandler.handleWorkflowTask(ReplayWorkflowRunTaskHandler.java:158)\nio.temporal.internal.replay.ReplayWorkflowTaskHandler.handleWorkflowTaskWithQuery(ReplayWorkflowTaskHandler.java:132)\nio.temporal.internal.replay.ReplayWorkflowTaskHandler.handleWorkflowTask(ReplayWorkflowTaskHandler.java:97)\nio.temporal.internal.worker.WorkflowWorker$TaskHandlerImpl.handleTask(WorkflowWorker.java:415)\nio.temporal.internal.worker.WorkflowWorker$TaskHandlerImpl.handle(WorkflowWorker.java:319)\nio.temporal.internal.worker.WorkflowWorker$TaskHandlerImpl.handle(WorkflowWorker.java:261)\nio.temporal.internal.worker.PollTaskExecutor.lambda$process$0(PollTaskExecutor.java:105)\njava.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1135)\njava.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)\njava.base/java.lang.Thread.run(Thread.java:831)\n",
  "encodedAttributes": null,
  "cause": {
    "message": "WorkflowTask: failure executing SCHEDULED->WORKFLOW_TASK_STARTED, transition history is [CREATED->WORKFLOW_TASK_SCHEDULED]",
    "source": "JavaSDK",
    "stackTrace": "io.temporal.internal.statemachines.StateMachine.executeTransition(StateMachine.java:163)\nio.temporal.internal.statemachines.StateMachine.handleHistoryEvent(StateMachine.java:103)\nio.temporal.internal.statemachines.EntityStateMachineBase.handleEvent(EntityStateMachineBase.java:84)\nio.temporal.internal.statemachines.WorkflowStateMachines.handleSingleEvent(WorkflowStateMachines.java:360)\nio.temporal.internal.statemachines.WorkflowStateMachines.handleEventsBatch(WorkflowStateMachines.java:273)\nio.temporal.internal.statemachines.WorkflowStateMachines.handleEvent(WorkflowStateMachines.java:221)\nio.temporal.internal.replay.ReplayWorkflowRunTaskHandler.applyServerHistory(ReplayWorkflowRunTaskHandler.java:234)\nio.temporal.internal.replay.ReplayWorkflowRunTaskHandler.handleWorkflowTaskImpl(ReplayWorkflowRunTaskHandler.java:218)\nio.temporal.internal.replay.ReplayWorkflowRunTaskHandler.handleWorkflowTask(ReplayWorkflowRunTaskHandler.java:158)\nio.temporal.internal.replay.ReplayWorkflowTaskHandler.handleWorkflowTaskWithQuery(ReplayWorkflowTaskHandler.java:132)\nio.temporal.internal.replay.ReplayWorkflowTaskHandler.handleWorkflowTask(ReplayWorkflowTaskHandler.java:97)\nio.temporal.internal.worker.WorkflowWorker$TaskHandlerImpl.handleTask(WorkflowWorker.java:415)\nio.temporal.internal.worker.WorkflowWorker$TaskHandlerImpl.handle(WorkflowWorker.java:319)\nio.temporal.internal.worker.WorkflowWorker$TaskHandlerImpl.handle(WorkflowWorker.java:261)\nio.temporal.internal.worker.PollTaskExecutor.lambda$process$0(PollTaskExecutor.java:105)\njava.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1135)\njava.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)\njava.base/java.lang.Thread.run(Thread.java:831)\n",
    "encodedAttributes": null,
    "cause": {
      "message": "",
      "source": "JavaSDK",
      "stackTrace": "",
      "encodedAttributes": null,
      "cause": null,
      "applicationFailureInfo": {
        "type": "java.lang.NullPointerException",
        "nonRetryable": false,
        "details": null
      }
    },
    "applicationFailureInfo": {
      "type": "java.lang.RuntimeException",
      "nonRetryable": false,
      "details": null
    }
  },
  "applicationFailureInfo": {
    "type": "io.temporal.internal.statemachines.InternalWorkflowTaskException",
    "nonRetryable": false,
    "details": null
  }
}
2

It looks like NullPointerException in the application code. I’m not sure why the stack trace is not logged. You can try to replay the workflow execution history using WorkflowReplayer to reproduce the problem under a debugger.