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Editorial Team
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Asked: 2026-05-27T02:45:12+00:00

In my servlet I start a background thread onContextInitialized() and consequently I need to

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In my servlet I start a background thread onContextInitialized() and consequently I need to stop it onContextDestroyed(). So my servlet needs a private instance variable (let’s call this daemon) pointing to this daemon thread.
The daemon runs fine, but the reference is lost as soon as I exit contextInitialized()! For example, if I implement doGet() to show the status of the thread, it throws a NPE

So the answer is, who can access my servlet private instance variable and set it to null?
I remark that the thread runs just fine, just the reference is broken

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1 Answer

  1. Editorial Team

    Just set the reference in Application Context or set it to some static field of some class[less preferable]

    Not sure what you want to achieve but this will do

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