What is the default heap size of a java program?

[guest_user]

I get the OutOfHeapMemory exception or something, what should I do? how can I check the current heap size of a java program?

[Junky]

Why do you want to know?

If you are running out of memory then examine your code to find out where your leaks are. You can use a profiler to help. Otherwise you can up the memory by using the -Xmx option.

[guest_user]

How does java leak memory?

[Tolls]

If you hold onto stuff you really don't need to be holding onto.

[guest_user]

If you hold onto stuff you really don't need to be holding onto.

1) When a thread dies, that is, if the isAlive() returns false, are the references within the thread get garbage collected?
2) In java, do I have to join a thread in order to free up resources like in the C language(pthreads)?

[Tolls]

If you still hold onto the thread object I'm not sure anything it references will die. Depends how you've written it.
The resources are freed if you have written your code such that the references are no longer reachable. So the garbage collector can collect them.

[fxRichard]

Default is 64mb starting and 256mb max

[guest_user]

If you still hold onto the thread object I'm not sure anything it references will die. Depends how you've written it.
The resources are freed if you have written your code such that the references are no longer reachable. So the garbage collector can collect them.

what about 2)
In java, do I have to join a thread in order to free up resources like in the C language(pthreads)?

[Tolls]

If you're talking about memory then there's really no such thing as freeing up memory in Java.
You just need to make sure the objects you create only exist in the scope they are required.