How can I figure out what is holding on to unfreed objects?

Question

One of our programs is sometimes getting an OutOfMemory error on one user\'s machine, but of course not when I\'m testing it. I just ran it with JProfiler (on

Answer 1

Some suggestions:

• Unlimited maps used as caches, especially when static
• ThreadLocals in server apps, because the threads usually do not die, so the ThreadLocal is not freed
• Interning strings (Strings.intern()), which results in a pile of Strings in the PermSpace