StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

PO
text
Body
copied!<p>I have the same problem. I did investigation 2 months ago, and the problem is in JAVA 7_0 virtual machine. In my scenario java.lang.management.MemoryUsage object is hanging and daily growing hundreds of MB. All the other object you see hanging are referenced by java.lang.management.MemoryUsage object. The problem is, that this MemoryUsage object is hanging only in java 7_0 and higher version, because this MemoryUsage class has been added into JAVA 7 and was never in previous java. And most important is, that this MemoryUsage class is hanging in memory only after I use JConsole to connect to the server. After JConsole connects first time, it creates some MemoryUsage tracking mechanism, which starts to create MemoryUsage objects. Those objects are used then to draw the nice graphs in JConsole. This is all ok. BUT, the problem is, that JAVA 7 is buggy, and never frees the memory. The MemoryUsage objects are hanging forever on the heap. Doesn't matter that you close JConsole, it will continue to grow afterwards. The first time you use JConsole to connect to JAVA 7_0 process, you create the problem and there is no solution. Just don't use Jconsole, or any other memory monitoring tool, or don't use Java 7. In my scenario, I am doomed, because I have to use Jconsole all the time, and JAVA 6 is no option for me, because there is another bug, which makes memory leaks thanks to Locking objects. I reported this bug to ORACLE, but I have no idea, if they got it, know about it, and are solving it. I am just waiting for newer version of java so I can test it and stop restarting my server every few days.</p>

Querying!

Guidance

An individual column

Larger individual text columns get their own page to allow for proper reading.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload