simple java heap memory problem possible memory leakage

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Project Description:
i have a java game and i am loading 2 simple animations which should be displayed (only about 30 mb)

but memory blows up to about 500 or 600 mb and then i get java heap exception.

when i stop the animation by setting the pointer of the loaded resources = null and doing System.gc() after that --
NOTHING happens no memory is being freed.

additionally the animations flickers on the beginning.

this project is about solving both memory problem (without just setting -Xms -Xmx this does not solve the problem)
solving the flickering on the beginning. show the animation clearly.

pls write pm

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