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Java Forum / General / May 2007outofMemory Exception in hot Deploy of jboss 3.2.5
hi... why after a few hot deploys i get OutOfMemory Exception (i've allready increased xmx and xms) > why after a few hot deploys i get OutOfMemory Exception (i've allready > increased xmx and xms) Probably a memory leak then. A number of pieces of code in Sun's JRE can leak class loaders (and hence all the classes and other data associated with them). ThreadLocal is the common one. But java.beans and JDBC also do it. You can use a memory profiler to tell where the problem is. Googling can give you more details. It may be the permanent generation (code and interned strings) that is running out. IIRC, -XX:MaxPermSize is the Sun option to increase that. Tom Hawtin which java Profiler should i use? and should i use the syntax java -XX:MaxPermSize=1024 ? (in jboss command line run.bat) > elh.maa...@gmail.com wrote: > [quoted text clipped - 13 lines] > > Tom Hawtin Please refrain from top-posting. <http://www.physci.org/codes/javafaq.html#toppost> >...should i use the syntax java -XX:MaxPermSize=1024 ? (in jboss >command line run.bat) If the problem is a memory leak as Tom suggested, no. At least, not unless you consider that doubling the memory might allow the app. to run (roughly) twice as long before failing, and that makes for 'a solution'.  SignatureAndrew Thompson http://www.athompson.info/andrew/ > Please refrain from top-posting. > <http://www.physci.org/codes/javafaq.html#toppost> [quoted text clipped - 6 lines] > memory might allow the app. to run (roughly) twice > as long before failing, and that makes for 'a solution'. Other options that may help you avoid the real problem until it pops up in production at the least opportune moment: -XX:+CMSClassUnloadingEnabled -XX:+CMSPermGenSweepingEnabled SignatureLew ... >> ...might allow the app. to run (roughly) twice >> as long before failing, and that makes for 'a solution'. [quoted text clipped - 4 lines] >-XX:+CMSClassUnloadingEnabled >-XX:+CMSPermGenSweepingEnabled Huhh. Those options are new to me. I'll have to look them up! SignatureAndrew Thompson http://www.athompson.info/andrew/ > .. >>> ...might allow the app. to run (roughly) twice [quoted text clipped - 7 lines] > Huhh. Those options are new to me. I'll have to > look them up! It's something I lifted from NetBeans's config file examples. Options like this are nearly undocumented, perhaps for a reason. I found <http://blogs.sun.com/watt/resource/jvm-options-list.html> SignatureLew (a variey of -XX options to java) >It's something I lifted from NetBeans's config file examples. > >Options like this are nearly undocumented, perhaps for a reason. Yes. Them non-standard options are always to be treated with a grain of salt (here one release, possibly gone the next?). >I found ><http://blogs.sun.com/watt/resource/jvm-options-list.html> Thanks. SignatureAndrew Thompson http://www.athompson.info/andrew/ 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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