How to reproduce Java OutOfMemoryError - GC overhead limit exceeded

Question

My approach was to create hundred thousand local collections and populate them with random strings, something like this:

    SecureRandom random = new Secure         


        

Answer 1

This:

HashMap map = new HashMap();

is scoped within the loop and there are no external (long-term) references to the map created as the loop iterates. Hence each map will be eligible for garbage collection at the end of each loop iteration.

You need to create a collection of objects outside the loop, and use the loop to populate that collection.