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Java Forum / General / March 2008how to overcome "java.lang.OutOfMemory" Error
We already increased the Heap Space, But still i am getting this error. Actually we did increase the heapspace upto 1024MB. still java process eating memory. After that application crashes. I already search so many sites in Google. Can anybody shed some light on this issue? Ananth, 03.03.2008 13:38: > We already increased the Heap Space, But still i am getting this > error. Actually we did increase the heapspace upto 1024MB. still java > process eating memory. After that application crashes. I already > search so many sites in Google. Can anybody shed some light on this > issue? There are two possible reasons: 1) you have a memory leak in your program (i.e. objects that are still referenced but no longer needed, so they cannot be garbage collected) 2) your program simply needs that much memory. Either you algorithm requires to hold that much data in memory, then you are out of luck, or you can rewrite the algorithm (e.g. not reading all 10 million rows from the database table or a 500MB XML file into a DOM tree or whatever you are doing there) Thomas > Ananth, 03.03.2008 13:38: > [quoted text clipped - 11 lines] > > Thomas Hi The simple way to get out of this situation is to follow the following give step 1) Increase the size of Heap Space, as you have already said that you had increased the size to 1024MB as per my knowledge it is more than enough. 2) Please look up your code especially by using some external IDE i.e. Eclipse, Weblogic IDE this type of tool gives you at the coding level only the object which are created but not used in the class, so that you can remove. 3) If possible try to run system.gc() (Not much sure, but still can't say anything this might be helpful to you tooo.) 4) If required please see the performace graph using some tool like, JProbe etc which will give you the memory leackage point in your application Regards Siddharatha Dhumale > 3) If possible try to run system.gc() (Not much sure, but still can't > say anything this might be helpful to you tooo.) This will be useless. Don't bother with System.gc(). (Not "system" - spelling counts!) Thomas gave you the best advice. A profiler can help identify where the leak is. So can really, really rigorous reasoning about the source code. Memory leaks in Java come from repeatedly keeping a reference after it isn't needed, such as by putting it into a collection like a Map. The solution is to use "temporary" variables that go out of scope (the block ends) as the only references to such objects. Avoid static and collection references to objects that need to go away. If your algorithm simply demands gigabytes (or gibibytes) of data, either you are going to have to stripe the algorithm or buy more RAM.  SignatureLew > We already increased the Heap Space, But still i am getting this >error. Actually we did increase the heapspace upto 1024MB. still java >process eating memory. After that application crashes. I already >search so many sites in Google. Can anybody shed some light on this >issue? see http://mindprod.com/jgloss/packratting.html http://mindprod.com/jgloss/profiler.html -- Roedy Green Canadian Mind Products The Java Glossary http://mindprod.com On Mar 3, 6:16 pm, Roedy Green <see_webs...@mindprod.com.invalid> wrote: > > We already increased the Heap Space, But still i am getting this > >error. Actually we did increase the heapspace upto 1024MB. still java [quoted text clipped - 7 lines] > Roedy Green Canadian Mind Products > The Java Glossaryhttp://mindprod.com Good articles. Thank you very much. Appreciate it. On Mar 3, 6:16 pm, Roedy Green <see_webs...@mindprod.com.invalid> wrote: > > We already increased the Heap Space, But still i am getting this > >error. Actually we did increase the heapspace upto 1024MB. still java [quoted text clipped - 7 lines] > Roedy Green Canadian Mind Products > The Java Glossaryhttp://mindprod.com So, I'm curious because I noticed you said that Images need to be flushed. What happens in the case when an Image is not actually created, but only set...such as... someObject.setImage(anImageIcon.getImage()); How is that handled? Should I be handling it? Very informative site, BTW. Thank you for the link. On Tue, 4 Mar 2008 11:40:35 -0800 (PST), Jason Cavett <jason.cavett@gmail.com> wrote, quoted or indirectly quoted someone who said : >someObject.setImage(anImageIcon.getImage()); what type is someObject. There is no method Object.setImage. Presumably when you were done with the image you might getImage().flush(). The images I work with tend to get loaded when the program starts and hang around till it terminates. -- Roedy Green Canadian Mind Products The Java Glossary http://mindprod.com On Mar 5, 3:05 am, Roedy Green <see_webs...@mindprod.com.invalid> wrote: > On Tue, 4 Mar 2008 11:40:35 -0800 (PST), Jason Cavett > <jason.cav...@gmail.com> wrote, quoted or indirectly quoted someone [quoted text clipped - 13 lines] > Roedy Green Canadian Mind Products > The Java Glossaryhttp://mindprod.com someObject is a TreeCellEditor. I set the image on the TreeCellEditor so I can set icons on the JTree. What I was thinking is that I may not need to flush due to the fact that, when the TreeCellEditor is destroyed, it'll lose the references to the image (since no other references are held anywhere). Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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