Garbage Collection is Not working

I Installed J2dk1.4 in my System.it's garbage Collector is not working,It does'nt free the memory in case of Frames and Applets.I use many methods to explicitly free the memory, Like :
====================
System.exit(0);
System.gc();
====================
but it does'nt work can any body give me the solution?
Email : [email protected]

How are you determining that it doesn't free memory?
If you're expecting Task Manager to show the VM using less memory, that won't happen. GC frees memory internally, so it can use that memory for other objects. It doesn't return it to the OS.
Also, calling gc() will not necessarily force the GC to run. Unless you're using a profiler, or getting OutOfMemoryError, you can't say for certain that the VM is not releasing memory.
Also, even if it's not releasing it, it doesn't mean it's a problem. It's guaranteed to release it when it needs it, but it may or may not release it sooner.
Finally, System.exit may not do anything in an applet, for security reasons.
What is your actual problem?

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Garbage Collection is not destruction?

Garbage Collection is not destruction?
This is one of the point from Thinking In Java 4th edition Chapter 5.Can someone please explain me this point.Does that mean that Garbage Collection does not destroy objects.If yes,then what is it role?
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personal opinion really. I do call garbage collection destruction, the memory occupied by the objects in question is reclaimed. It is a discussion point however as it is from the perspective of the JVM; from the perspective of the application the object is "destroyed" as soon as you cut all references to it.
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Full garbage collection issue, not releasing/flagging memory

I have the following problem running on a multi-cpu windows server with Java 1.4.2_05 using WebLogic 8.1:
During a lifecyle of the web application (under load, but not to heavy) memory usage seems ok and garbage collection is called regularly. Suddenly, the used heap starts to rize very fast and after a while, even a full garbage collection cylce, does not release any memory anymore.
I am sure that, from our coding, we release memory ok, and normally we should only use about 5 to 10 mb for each user max (with0 normal defnew garbage collections).
I tried changing the garbage collection parameters, but this does not solve the problem. Best scenario was with the concurrent collector and I got this output at +/- the end:
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[GC 148480K->139612K(163808K), 0.0225914 secs]
[Full GC[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor289]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor290]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor273]
153750K->133006K(164064K), 1.2434402 secs]
[GC 148939K->137948K(203264K), 0.0223085 secs]
[GC 188789K->177116K(203264K), 0.0180729 secs]
[Full GC[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor312]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor322]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor309]
189788K->170264K(203264K), 1.1851945 secs]
[Full GC 203228K->203227K(203264K), 1.2876122 secs]
[Full GC 203263K->203233K(203264K), 1.3354548 secs]
[Full GC 203263K->203258K(203264K), 1.2873518 secs]
<Jan 17, 2007 9:40:40 AM EST> <Error> <HTTP> <BEA-101017> <[ServletContext(id=33114655,name=console,context-path=/console)] Root cause of ServletException.
java.lang.OutOfMemoryError
>
[Full GC 203263K->203233K(203264K), 1.2814516 secs]
[Full GC 203233K->203231K(203264K), 1.6029044 secs]
[Full GC 203263K->203242K(203264K), 1.3081352 secs]
<Jan 17, 2007 9:41:51 AM EST> <Emergency> <WebLogicServer> <BEA-000210> <The WebLogic Server is no longer listening for connections.>
[Full GC 203263K->203247K(203264K), 1.3161194 secs]
[Full GC 203263K->203249K(203264K), 1.2954988 secs]
[Full GC 203263K->203247K(203264K), 1.6423404 secs]
<Jan 17, 2007 9:41:57 AM EST> <Alert> <WebLogicServer> <BEA-000218> <Server shutdown has been requested by <WLS Kernel>>
[Full GC 203263K->203250K(203264K), 1.3161025 secs]
Another strange item is: I maximized the amount of memory it uses to 512m with the Xmx parameter, I am almost sure that that one is used, but it never gets higher than 203M? Does anyone know why this is?
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This problem does not exist when using JBoss 4.0.2 or 4.0.3 (standard j2ee settings).
If anyone has an idea or can help me, I would appreciate it very very much. :)

Hi ,
Is this issue resolved ?
we are facing same problem.
1. We have checked the CPU and memory utilization everything is normal
2. GC logs showing FULL GC calls continuously
3. After restart the resin server system is working normally.
Environment detail
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Java JDK1.4.2_08
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Collect statement not working

Hi,
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thanks
Moderator message - Please ask a specific question - post locked
Edited by: Rob Burbank on Nov 19, 2009 9:24 AM

Same thing i faced few days ago --. i have resolved this using following logic ... try this it will workout
CLEAR: wa_mkpf_mseg, w_werks, w_matnr, w_lgort, w_bwart.
LOOP AT t_mkpf_mseg INTO wa_mkpf_mseg.
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CLEAR: wa_p_coi.
READ TABLE t_p_coi INTO wa_p_coi WITH KEY werks = wa_mkpf_mseg-werks matnr = wa_mkpf_mseg-matnr lgort = wa_mkpf_mseg-lgort bwart = wa_mkpf_mseg-bwart.
IF sy-subrc = 0.
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It DOES work if I select the folder, parent folder, or just the
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Good Day!!!
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for example please made three files
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Gerd Wagner mailto:[email protected]
SHD Datentechnik GmbH & Co. KG fax :(49)2632/295-269
Rennweg 60 phone :(49)2632/295-0
D-56626 Andernach WWW :http://www.shd.de

Hi,
we are running WL 5.1 SP4. We pass RMI remote references to a
client. The implementation of the references implement the
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unreferenced method of the objects being called.
We passed thousands of objects to the client an set all
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Neither does the unreferenced method get called when the
client shuts down.
Not even the finalize method of the objects is being called.
Any suggestions.
Regards
Gerd
Gerd Wagner mailto:[email protected]
SHD Datentechnik GmbH & Co. KG fax :(49)2632/295-269
Rennweg 60 phone :(49)2632/295-0
D-56626 Andernach WWW :http://www.shd.de

Garbage Collection is Not working

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