run script

So, for many java core applications people use self made run-scripts. Most of them are some kind of sh/bash script that run java process with required arguments, classpath and so on and so on. After process is started script usually makes a pid file to track just created java process.

Many our java applications uses spring framework that's why we use Boostraper which helps us for many cases.

run script output

I do really like bash and unix-like systems,

Status brief summary:

• current time stamp

  DATE=$(date +"%Y-%m-%d %H:%M:%S")

• table view - easy to read, easy to check
  

  printf "%-42s"   "${APP_NAME}"
  printf "%-9s"    " | $(( ${PID})) "
  printf "%-9s"    " | $(( ${NO_THREADS})) "
  printf "%-20s"    "| ${START_TIME}"
  printf "%-10s\n"  "| ${STATUS}"

• application name and its pid
• lwps - a number of light weight processes for this application - that's java threads + jvm native threads

  ps -o nlwp -p ${PID} | tail -1

• app start time - based on time stamp of /proc/pid/ - able to check when app was started manually or restarted on watchdog
  

  perl -e '@d=localtime ((stat(shift))[9]); printf "%4d%02d%02d %02d:%02d:%02d", $d[5]+1900,$d[4]+1,$d[3],$d[2],$d[1],$d[0]' /proc/${PID}

• status - based on the quick analysis of the last line of context log file (produced by spring boostrap)