Application cannot be accessed if we increase the OC4J memory

Hi friends,
we have made about 4 application and deployed each on oc4j server, all running at same time. The problem is that after some time OC4J shows error message java.lang.outofmemory. We tried to increase the memory usage by using
java -Xms512m -Xmx512m -jar oc4j.jar
but now the applications are not accessible
Plz help

Hi Kenton
Thanks for the reply. as earlier i was using oc4j server. Now i have downloaded oracle application server 10.1.2., but now i am not able to make connection to application server. I have installed only the j2ee container and oc4j server in application server.
can you tell me how to do that?
do we need to configer AS before we make connection
what is rmi url and username password? Is it necessary for making connection
This is the error message
HTTP connection failure: unknown port number or missing HTTP listener

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