How to find causes for the casandra killing frequently?

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http://serverfault.com – Installed the cassandra 0.8 in centos linux system with 1GB ram. Within an hour after starting the cassandra, it is dying frequently. Also, i can say java is also killing , which is necessary for running cassandra So, may i know, how to find the causes for cassandra dying. Memory Usage: -bash-3.2# free -m total used free shared buffers cached Mem: 500 454 46 0 17 352 -/+ buffers/cache: 84 415 Swap: 1023 0 1023 (HowTos)