jrunscript in a target VM

Mustang's jrunscript is cool, but it just launches a new VM and runs your script. Sometimes you want to find out what is going on in an existing process, or control it somehow, using JavaScript. Now you can! Download jrunscriptin.jar and run with

java -jar jrunscriptin.jar

Usage:
  java -jar jrunscriptin.jar <PID> 
    where <PID> is as in jps
  java -jar jrunscriptin.jar <match> <JavaScript>
    where <match> is some substring of the text after a PID visible in jps -lm
Example using NetBeans IDE (quoting as in Bourne Shell, adapt as needed):
  java -jar jrunscriptin.jar netbeans \
  'Packages.org.openide.awt.StatusDisplayer.getDefault().setStatusText("Hello from abroad!"); \
  java.lang.System.out.println("OK!")'
Requires Mustang (JDK 6) for both this tool and the target VM.

Posted at 02:11PM Feb 15, 2006 by jglick in Sun  |  Comments[4]