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This will produce a thread dump on standard output, but may not be possible to capture to a file.

How do I read a Java thread dump ?

Java thread dumps are just text files, so you can read them with any text editor. There are some tools that can make your life easier, especially if you need to look at more than one thread dump at once.

One such tool is the Thread Dump Viewer (TDV), which you can find here: http://tdv.sourceforge.net/. It is a bit old (last release: 2007) but it can be somewhat helpful.

How do I obtain a heap dump?

See Getting a Heap Dump on the help pages of Eclipse Memory Analysis Tool.

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