Generate Java Heap Dump on uncaught Exception

Question

I try to generate a Heap Dump when a uncaught exception is fired. I tried using jmap, but because the process is finished when the exception happens this is not possible.

Answer 1

Try to put your processing into a deamon thread. this way you can access it with memory analysis tools. JVisualVM is a JDK tool you can find it in your JAVA_HOME\bin.

There are also another way, called dump analyser. You run your application with these JVM parameters :

• -XX:+HeapDumpOnOutOfMemoryError

• -XX:HeapDumpPath="your_path"

But this is used only if you have an OutOfMemoryError. Try to find if it's possible to generate the dump for any performance.

Another good eclipse based tool is MemoryAnalyzer