Monday, October 20, 2008

jps - The Java way when you need to kill something Groovy

As a speaker, I'm often showing "how" to do something and often requested for "When" / "Why". I just experienced a great example of this with jps. jps is of course is the Java ps tool that is included with JDK5 and 6. So it is already on a Java developer's machine. It is the platform independent way to get PIDs.

How it Started
The Yak-Shaving started when I decided to run a groovy script from TextMate. I conventiently hit +R. Everything ran the way I wanted it to. Except... There wasn't an end to the program script... idiot! So, I closed TextMate... Still Running....

Step 1
First I went to the command line and did a ps... which didn't result in much. I followed this up with a ps -ef. Way too much info... so I ended with a ps -ef | grep JavaVM. Things just got worst. That is a lot of information!

Along comes jps. A simple jps (no args) and here are the results
10620 GroovyStarter
10314 JConsole
10761 Jps

There it is GroovyStarter... kill 10620.

... and what if you had multiple GroovyStarter scripts running. Well, jps -m will give you the command-line of the script, which includes the groovy script name.

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