When this exception occurs, it means java runs out of memory.

You can increase memory(heap size) by run java including these parameters:

-Xms[initial heap size] -Xmx[maximum heap size]

For example, set initial heap size to 128m and maximum to 256m.

java -Xms128m -Xmx256m

In NetBeans, simply goes to Project Properties –> Run.
Then you can add these parameters in VM Options.

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