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Singleton instance lifecycle

Joe Harry
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Joined: Sep 26, 2006
Posts: 9740


How is the lifecycle of a POJO Singleton instance managed in an app / web server. I have a Singleton class and this will be accessed by some components which are under the control of an app server. Now upon first request for this Singleton instance, the ClassLoader will load the class in memory, create an instance and is this instance retained in the memory untill the app server is brought down?

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Rob Spoor

Joined: Oct 27, 2005
Posts: 19903

Until the class is unloaded, which usually indeed is when the app server (or JVM for standalone apps) is shut down.

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Monu Tripathi

Joined: Oct 12, 2008
Posts: 1369

Even I asked this question once!

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Joe Harry
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Joined: Sep 26, 2006
Posts: 9740

Thanks for the information.
I agree. Here's the link:
subject: Singleton instance lifecycle