Howto Force Garbage Collection manually in Oracle Application Server

Hi,
I have a Oracle SOA suite installed on Oracle 10g Application Server. The heap memory for the SOA oc4j container is 2G with a permgen space of 256M. But it looks like there is some memory leak somewhere and the Heap area is getting filled frequently and this causes an *[libopmnoc4j] OC4J ping attempt timed out* and as a result of this the SOA oc4j container gets restarted automatically.
Is there any means by which we can force a Garbage Collection manually so that this automatic restart does not happen.
Kindly let me know if it is possible to trigger a Garbage Collection manually in Oracle Application Server.
Thanks,
Vijay.

We had a similar situation where the oc4j instance will throw OutOfMemoryException and opmn will restart a new instance every 10-12 hours. The JDBC 10.2.0.3 driver has a memory leak in the XA Resource classes. There is a fix available in metalink.

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If you really want to see the results you should also run the finalizer
thread on the newly garbage collected objects. It might take up to 2 GC
cycles for the memory to be actually free for new allocation at least on
the Sun JVMs. Maybe the new types of garbage collectors do it better or
more optimized but anyway, the GC would first mark the objects and only
then the finalizer will run to call the finalize method. Then next GC
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HTH,
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Dinesh wrote:
Hi Slava Imeshev,
Thanks for immediate response. I agree JVM will do GC at specific interval. But,
I have found that , there is some difference in both of them. If you invoke "Force
Garbage Collection" explicitly, the graph will show the heap memory usage to baseline.
Where in, if you perform System.gc(). It won't make much difference.
Thus why, I want to know what is the code behind the "Force Garbage Collection"
button.
Thanks,
-Dinesh.
"Slava Imeshev" <[email protected]> wrote:
"Dinesh" <[email protected]> wrote in message news:406a8df4$[email protected]..
How can i schedule "Force Garbage Collection" to be done at every
week or daily?.
Can i automate this process instead of manually invoking the button?
GC is already done by JVM automatically.
Why would you want to "schedule" it?
Regards,
Slava Imeshev

Do you think JOptionPane dialogs force garbage collection afterwards?

I ask because I've made a nested static class to implement my own file selection tool; the problem is that each time I call it the old JPanel is being recalled and so the components get re-added to it each time it's called, resulting in n versions of each file for every n times you open it.
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Strictly speaking there is no way to force garbage collection, so, no, JOptionPane will not be doing it.
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Is there any possibility in big programs if not designed properly for leakage of memory?
If say i forget to force garbage collection of unused resouces what will happen?
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I need answers w.r.t typical programming examples if someone can provide i will be happy.
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Memory leaks are usually much related with C/C++ programming since in that language you have direct access to memory using pointers.
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Why can we force Garbage Collection

Hello,
Why can we force garbage collection since we have AUTOMATIC garbage collection?

If you don't call dispose on the Window, it may keep a
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thread is still running and accesible from the root,
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Before I load a new level, should I force garbage collection on the old level? And if so, how?

Just remember that the method suggest the garbage collector to run, not forcing it..
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Force Garbage collection externally....

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Thanx
Rgds,

You can't force a full GC as far as I know. gc() might force a GC of the youngest generation.
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Refer this metalink note,
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[email protected]

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Howto Force Garbage Collection manually in Oracle Application Server

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