System slow down and lag due to a java process

Our oracle system often experiences system slowdown and lag. This results to abnormal termination of process and requests and transaction problems. Upon inspecting our process log, we see a java process consuming large memory space. We suspected that this is caused by a memory leak of the java process. we wanted to solve this problem immediately as it causes delay in our transactions and data corruption. Is there a patch or documented solution for this?

Thanks.

(attached is the screenshot of the process log, i highlighted the java program that consumes a large memory)