hotswap debugging: changing class files on the fly in debugger in java

When you connect your debugger to server, you can make changes to the code and force the server to reload the classfiles on the fly. You don’t have to restart the server. You can continue debugging with the changed code. This feature of JPDA is called hotswap debugging.

More on this at : http://java.sun.com/j2se/1.4.2/docs/guide/jpda/enhancements.html

Related topic: Hot deploy

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