Script to trigger java dump when WebSphere JVM does a full GC

trigger_javadump.sh

#!/bin/bash
#
# Run this in the background and keep it running when you log out run it like this:
# nohup /tmp/trigger_javadump.sh >/tmp/trigger_javadump.log 2>&1 &
#
FULLGC_PATTERN='^Application time: 0.0000'
VERBOSEGC_PATH='verbosegc.log'

while true; do
  FULLGC_FOUND=$(grep "$FULLGC_PATTERN" "$VERBOSEGC_PATH")
  if [ "$FULLGC_FOUND" ]; then
    echo "Full GC found"
    # Generate thread dump on all WebSphere instances running
    for pid in $(pgrep -f WebSphere); do 
      kill -3 $pid
    done
    exit 0
  fi
  sleep 1
done