java out of memory error-Why out of memory error occurs in Java?

 How do I free up Java memory?

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Whenever you produce AN object in Java it's hold on within the heap space of the JVM. If the JVM isn't able to portion memory for the new created objects AN exception named Out Of Memory Error is thrown.

This sometimes happens after we don't seem to be closing objects for while or, attempting to act immense quantity of information promptly.

There square measure three varieties of errors in Out Of Memory Error −

Java heap area.

GC Overhead limit exceeded.

Permgen area.

This is AN example of poor programming, however the nice news is that the exception stack trace clearly points North American country to seem for the code wherever this error occurred. but typically the matter could be in another areas of the program, therein case we are going to want facilitate of java profilers like Visual VM to work out wherever most of the memory is being allotted and the way to optimize it.

Increasing the memory of JVM could be a mend to unravel the matter, unless you're running on terribly low memory. If you're already running on high JVM memory like 2GB or a lot of, then you ought to explore the applying code to optimize it, explore thread dump and java profiler output to visualize why your application needs high memory and if you'll be able to scale back it.