[FOREXAM] When the gc thread cannot be invoked?

Hi, I considered the following statement:
The garbage collection thread can be invoked at any time
as true, but according to a Mock exam is false. Can anyone tell me why? When is not possible to call the gc thread?
Marco

You have no control over when the gc thread runs. Calls to System.gc() just act as hints to the gc that it should run, but it will still do it in its own sweet time.

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    at com.tangosol.net.cache.ReadWriteBackingMap$StoreWrapper.load(ReadWriteBackingMap.java:4698)
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    Date: Thu, 9 May 2013 17:59:08 -0700
    From: [email protected]
    To: [email protected]
    Subject: When I type I cannot add text when I select the text area and double click. Why?
        Re: When I type I cannot add text when I select the text area and double click. Why?
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