Analysing which Java process is hiting High CPU and ways to rectify the issue

run top (shift)H and get PID of the thread with highest CPU.

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND

19848 x_xxx     25   0 1467m 753m 9832 S 406.4  0.5  35372:22 java

convert the PID to hex. 

Refer http://www.binaryhexconverter.com/decimal-to-hex-converter

19848 >> 0x4d88

nid=0x4d88 -> Search this in the Thread Dump

 (jstack > ) /cfp/apps/java/jdk1.6.0_30/bin/jstack 19848 > /var/tmp/ThreadDump.txt

look for thread with the matching HEX PID in your thread dump.

You can use tools like Visual VM to analyse jmap and the Thread Dump

Vicual VM -> CPU tab