Periodically creates thread dump of a running java process to debug unresponsive/blocked threads

java_threaddump.sh

#!/bin/bash

# get process_id using jps -v or ps
# ps -mo pid.lwp.stime.time.cpu -C java
# your/path/to/jstack `ps aux | grep java | grep -v grep | awk '{print $2}'` >> threaddump.log

readonly process_id=${1}
readonly times=${2:-10}
readonly pause=${3:-10}

for((i=1;i<=$times;i++))
do
    dump="threaddump_${i}"
    jstack ${process_id} > ${dump}
    echo "dumped to ${dump}"
    sleep ${pause}
done