CpuThreadAnalyser.sh

#!/bin/bash

# Prints information about the Java threads that consumes most of the CPU
# Derived from the information given in the blog entry at
#
# http://nurkiewicz.blogspot.be/2012/08/which-java-thread-consumes-my-cpu.html
#
# Changelog:
#
# - Removed the `top', `perl', and `grep' dependencies.  
# - Used a single command chain (instead of two, as done in the original blog 
#   entry) to assign two columns (process id and thread id) to an array variable.
#
# TO DO:
#
# - Remove `sort' dependency and use --sort of `ps' (variations of --sort=cpu, pcpu, c
#   + / - did not sort according to CPU utilization). More research required for less
#   dependency. 
#
# - More testing required (as usual).

IDS=($(ps -fLC java | sort -rnk5 | head -n1 | cut -d' ' -f9,13))

PID=${IDS[0]}
NID=$(printf "%x" ${IDS[1]})

jstack $PID | grep -A500 $NID | grep -m1 "^$" -B 500