blocks|key|868344|text|对此的答案取决于与OutOfMemoryException关联的消息。你也可以试试-XX:MaxPermSize=..。并将其设置为256米这样更大的尺寸。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|868345|另外，如果在某个地方有一个递归函数，这可能会导致堆栈溢出。|868346|如果可以，请发布与异常相关的消息。Stacktrace也可能有帮助。|868347|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

The answer to this is dependent on the message associated with the OutOfMemoryException. You can also try -XX:MaxPermSize=... and set it to something larger like 256m.

Also, if you have a recursive function somewhere, that may be causing a stack overflow. 

If you can, please post the message associated with the exception. Stacktrace might also help.

blocks|key|212000|text|如果您想查看堆转储文件，IBM提供了分析它们的工具这里。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|212001|entityMap|0|LINK|mutability|MUTABLE|url|http://publib.boulder.ibm.com/infocenter/tivihelp/v3r1/index.jsp?topic=/com.ibm.itcamwas_b.doc_6.1/pdmst_basic56.htm^0|P|2|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

If you want to look at the heap dump files, IBM offers tools to analyze them <a href="http://publib.boulder.ibm.com/infocenter/tivihelp/v3r1/index.jsp?topic=/com.ibm.itcamwas_b.doc_6.1/pdmst_basic56.htm" rel="nofollow noreferrer">here</a>.

blocks|key|1211101|text|“谢谢你的回忆”是一篇很好的关于JVM使用内存的文章，它可能有助于分析这个问题.|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1211102|感谢布瓦莱塞提供这个链接|1211103|entityMap|0|LINK|mutability|MUTABLE|url|http://www.ibm.com/developerworks/linux/library/j-nativememory-linux/index.html?ca=dgr-jw22Linux-JVM&S%255FTACT=105AGX59&S%255FCMP=grjw22|1|https://stackoverflow.com/users/15375/bwalliser^0|0|8|0|0|2|4|1|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@$A|U|B|V|1|W]]|C|$]]|$1|F|3|-4|5|6|7|X|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]]]

<a href="http://www.ibm.com/developerworks/linux/library/j-nativememory-linux/index.html?ca=dgr-jw22Linux-JVM&amp;S%5FTACT=105AGX59&amp;S%5FCMP=grjw22" rel="nofollow noreferrer">"Thanks for the memory"</a> is a good article about the JVMs use of memory, which might help to analyse this problem...

Thanks to <a href="https://stackoverflow.com/users/15375/bwalliser">bwalliser</a> for this link

blocks|key|212031|text|尝试在本地重现问题，这样您就可以使用像JProfiler这样的工具来调试它。即使您不能在本地强制使用OOM，您也有可能看到JProfiler中的内存增加。然后拍摄快照，查找未被垃圾收集的类。这不是一门精确的科学，但它比查看IBM堆堆要容易得多。但是，如果有必要，检查堆转储的旧方法是使用HeapRoots。这可能取决于你所使用的版本。我知道IBM的某些版本在压缩方面存在问题，所以即使您有足够的内存，也可以获得OOM，因为没有足够大的片段可用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|212032|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Try to reproduce the problem locally so you can use a tool like JProfiler to debug it. Even if you can't force an OOM locally, chances are you'll see the memory increase in JProfiler. Then you take snapshots and look for classes that aren't being garbage collected. It's not an exact science, but it's much easier than looking through an IBM heapdump. However, if you have to, the old way of examining a heap dump was with HeapRoots. It may depend on the version you're on. I do know that some versions of the IBM JDK have problems with compacting so even if you have plenty of memory, you can get an OOM because there's not a large enough fragment available.

blocks|key|872833|text|我假设您使用hibernate/JPA作为持久性提供程序？您正在使用二级缓存吗？如果是这样的话，您考虑过将大型结果集从缓存中逐出吗？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|872834|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I assume your using hibernate/JPA as a persistence provider? Are you using a second level cache? If so have you considered evicting large results sets from the cache?

blocks|key|1211075|text|这个问题很难回答，如果我们不知道它是什么样的OutOfMemoryError；permgen和heapspace是两种截然不同的野兽。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1211076|我在JBoss上忙了好几个月，尽管这种特殊类型的问题对于任何动态重新加载web应用程序的应用服务器都是普遍的。这一传奇被记录为这里。|1211077|你的垃圾堆.可能是你可以用月食垫分析它们。|1211078|entityMap|0|LINK|mutability|MUTABLE|url|http://my.opera.com/karmazilla/blog/2008/08/31/permgen-our-workable-solution|1|http://www.eclipse.org/mat/^0|13|7|1B|9|0|1R|2|0|0|D|3|1|0^^$0|@$1|2|3|4|5|6|7|T|8|@$9|U|A|V|B|C]|$9|W|A|X|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Y|8|@]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|H|3|I|5|6|7|12|8|@]|D|@$9|13|A|14|1|15]]|E|$]]|$1|J|3|-4|5|6|7|16|8|@]|D|@]|E|$]]]|K|$L|$5|M|N|O|E|$P|Q]]|R|$5|M|N|O|E|$P|S]]]]

The question is hard to answer if we don't know what kind of OutOfMemoryError it is; <code>permgen</code> and <code>heapspace</code> are two very different beasts.

I was chasing a perm-gen for many months on JBoss, though the that particular type of problem was general to any application server that reloaded web applications on the fly. The saga is documented <a href="http://my.opera.com/karmazilla/blog/2008/08/31/permgen-our-workable-solution" rel="nofollow noreferrer">here</a>.

Those heap-dumps you have... could be that you can analyze them in <a href="http://www.eclipse.org/mat/" rel="nofollow noreferrer">Eclipse MAT</a>.

Often, I found OutOfMemoryException on IBM Websphere Application Server.
I think this exception occur because my application retrieve Huge data from database. So, I limit all query don't retreive data more than 1000 records and set JVM of WAS follow

<pre><code>+ Verbose garbage collection
+ Maximum Heap size = 1024 (RAM on my server is 16 GB and now I already change to 8192)
+ Debug arguments = -Djava.compiler=NONE -Xdebug -Xnoagent 
 -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=7777
+ Generic JVM arguments = -Dsun.rmi.dgc.server.gcInterval=60000 
 -Dsun.rmi.dgc.client.gcInterval=60000 -Xdisableexplicitgc 
 -Dws.log=E:\WebApp\log -Dws.log.level=debug
(ws.log and ws.log.level are my properties)
</code></pre>

And I found heapdump, javacore and snap files in profiles folder I think them can tell me about cause of problem but I don't know how to read/use heapdump, javacore and snap files.

Please tell me how to prevent/avoid/fix OutOfMemoryException.
Thanks

IBM Websphere OutOfMemoryException

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我经常在IBM上找到OutOfMemoryException。我认为出现此异常是因为我的应用程序从数据库中检索大量数据。因此，我限制所有查询不要撤回超过1000条记录的数据，并设置如下JVM+ Verbose garbage collection+ Maximum Heap size = 1024 (RAM on my server is 16 GB and now I already chang

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