Memory dump

Tomcat crashes with regular java hprof dumps

I have deployed an webapp in tomcat.But my tomcat crashes within 1-4 days.It creates .hprof dumps.I analyzed the dumps using Eclipse Memory Analyzer Tool (MAT).I am new to this kind of error.Can anybody help me out on this.I have assigned 1 GB memory at-most for tomcat in my application.

Thanks.

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