NullPointerException running Batch job in WebLogic with managedScheduledExecutorService

Question

I use batch job in my project and i deployed it on weblogic. I set datasource and schema name in weblogic console. When I want to start job by running BatchRuntime.getJobOperator().start("test-job", new Properties())i got below error:

javax.batch.operations.JobStartException: java.lang.NullPointerException
        at com.ibm.jbatch.container.api.impl.JobOperatorImpl.start(JobOperatorImpl.java:92)
        at com.test.job.JobUtils.startJob(JobUtils.java:19)
        at com.test.job.WaitScheduler.execute(WaitScheduler.java:33)
        at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
        at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:573)
Caused By: java.lang.NullPointerException
        at com.ibm.jbatch.container.services.impl.SPIDelegatingThreadPoolServiceImpl.executeTask(SPIDelegatingThreadPoolServiceImpl.java:59)
        at com.ibm.jbatch.container.impl.BatchKernelImpl.startJob(BatchKernelImpl.java:135)
        at com.ibm.jbatch.container.api.impl.JobOperatorImpl.startInternal(JobOperatorImpl.java:123)
        at com.ibm.jbatch.container.api.impl.JobOperatorImpl.start(JobOperatorImpl.java:88)
        at com.test.job.JobUtils.startJob(JobUtils.java:19)
        at com.test.job.WaitScheduler.execute(WaitScheduler.java:33)
        at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
        at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:573)

In EXECUTIONINSTANCEDATA I have below record:

+-------------+-----------------+--------------------------------+-------------+-----------+--------------------------------+--------------+---------------+--------------+
| "JOBEXECID" | "JOBINSTANCEID" |          "CREATETIME"          | "STARTTIME" | "ENDTIME" |          "UPDATETIME"          | "PARAMETERS" | "BATCHSTATUS" | "EXITSTATUS" |
+-------------+-----------------+--------------------------------+-------------+-----------+--------------------------------+--------------+---------------+--------------+
| "25457"     | "25457"         | "20-APR-18 12.55.24.157000 PM" | ""          | ""        | "20-APR-18 12.55.24.157000 PM" | "<BLOB>"     | "STARTING"    | ""           |
+-------------+-----------------+--------------------------------+-------------+-----------+--------------------------------+--------------+---------------+--------------+

EDIT: New stack trace (job scheduled by managedScheduledExecutorService)

javax.batch.operations.JobStartException: java.lang.NullPointerException
        at com.ibm.jbatch.container.api.impl.JobOperatorImpl.start(JobOperatorImpl.java:92)
        at com.test.job.JobUtils.startJob(JobUtils.java:22)
        at com.test.job.JobStarter.run(JobStarter.java:18)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at weblogic.work.concurrent.TaskWrapper.call(TaskWrapper.java:151)
        at weblogic.work.concurrent.future.AbstractFutureImpl.runTask(AbstractFutureImpl.java:391)
        at weblogic.work.concurrent.future.AbstractFutureImpl.doRun(AbstractFutureImpl.java:436)
        at weblogic.work.concurrent.future.ManagedScheduledFutureImpl.timerExpired(ManagedScheduledFutureImpl.java:86)
        at weblogic.work.concurrent.future.ManagedPeriodFutureImpl.timerExpired(ManagedPeriodFutureImpl.java:97)
        at weblogic.timers.internal.TimerImpl.run(TimerImpl.java:301)
        at weblogic.work.concurrent.future.ManagedScheduledFutureImpl.run(ManagedScheduledFutureImpl.java:96)
        at weblogic.invocation.ComponentInvocationContextManager._runAs(ComponentInvocationContextManager.java:352)
        at weblogic.invocation.ComponentInvocationContextManager.runAs(ComponentInvocationContextManager.java:337)
        at weblogic.work.LivePartitionUtility.doRunWorkUnderContext(LivePartitionUtility.java:57)
        at weblogic.work.PartitionUtility.runWorkUnderContext(PartitionUtility.java:41)
        at weblogic.work.SelfTuningWorkManagerImpl.runWorkUnderContext(SelfTuningWorkManagerImpl.java:644)
        at weblogic.work.ExecuteThread.execute(ExecuteThread.java:415)
        at weblogic.work.ExecuteThread.run(ExecuteThread.java:355)
Caused by: java.lang.NullPointerException: null
        at com.ibm.jbatch.container.services.impl.SPIDelegatingThreadPoolServiceImpl.executeTask(SPIDelegatingThreadPoolServiceImpl.java:59)
        at com.ibm.jbatch.container.impl.BatchKernelImpl.startJob(BatchKernelImpl.java:135)
        at com.ibm.jbatch.container.api.impl.JobOperatorImpl.startInternal(JobOperatorImpl.java:123)
        at com.ibm.jbatch.container.api.impl.JobOperatorImpl.start(JobOperatorImpl.java:88)
        ... 17 common frames omitted

Answer 1

I had similar problem in a WLS 12.2.1.2.0. The error would only occur if the WLS was restarted with an EAR deployment but would work correctly after the first deployment of said EAR deployment.

The issue was a singleton bean annotated with @Startup which would call and store the JobOperator in a private field as such:

private JobOperator jobOperator;

@PostConstruct
public void initialize() {
    jobOperator = BatchRuntime.getJobOperator();
}

The solution was to remove the @Startup annotation so the WLS could initialize the Batch runtime instead of using the class loader of the EAR file in @PostConstruct and then calling BatchRuntime.getJobOperator() every time the JobOperator was needed inside the application