How can i see used memory by object?

[Adam Daduev]

For the beginning i apologize for my English, I have the problem, I am using Jboss server, and through some time Jboss shows that the memory almost end, I can see total memory (through jmx console) which is used, but how i can see which object used most of memory part or see what objects and how much memory use?

[Jaikiran Pai]

See the Sun Java specific -XX:+PrintClassHistogram here http://www.jboss.org/community/wiki/OutOfMemoryExceptions

[Peter Johnson]

JDK 6 comes with VisualVM which will show you heap usage by class. And there are also the jmap and jhat tools that come with the JDK.

[Adam Daduev]

VisualVM do not show heap usage, because Jboss server is locate remove, and run under Unix.