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https://issues.apache.org/jira/browse/NIFI-9331?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Handermann updated NIFI-9331:
-----------------------------------
Status: Patch Available (was: In Progress)
> Potential NPE when logging long-running tasks
> ---------------------------------------------
>
> Key: NIFI-9331
> URL: https://issues.apache.org/jira/browse/NIFI-9331
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework
> Reporter: Mark Payne
> Assignee: David Handermann
> Priority: Minor
> Time Spent: 10m
> Remaining Estimate: 0h
>
> In the ThreadUtils class, we have the following code:
> if (monitor.getLockedStackFrame().equals(element))
> However, getLockedStackFrame() can return null, which results in a NPE such
> as:
> 2021-10-24 11:38:17,122 ERROR org.apache.nifi.engine.FlowEngine: Uncaught
> Exception in Runnable task
> java.lang.NullPointerException: null
> at
> org.apache.nifi.util.ThreadUtils.createStackTrace(ThreadUtils.java:72)
> at
> org.apache.nifi.controller.StandardProcessorNode.getActiveThreads(StandardProcessorNode.java:1443)
> at
> org.apache.nifi.components.monitor.LongRunningTaskMonitor.run(LongRunningTaskMonitor.java:57)
> at org.apache.nifi.engine.FlowEngine$2.run(FlowEngine.java:110)
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
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