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JRebel is a tool from ZeroTurnaround that hotswaps compiled java classes on the fily while your application is running. This will greatly reduce the number of times your must restart your app as your make changes during development and thus save you time and productivity interruptions.

How to install and use JRebel

  • Get a free 30-day license, a open source developer license or a paid license from ZeroTurnaround
  • Put the license file (jrebel.lic) into a directory named .jrebel in your home directory. ( ~/.jrebel/jrebel.lic )
  • Get the JRebel plugin. Go to Eclipse->Preferences->Available Software Sites, add http://www.zeroturnaround.com/update-site/

  • Download the Jrebel Eclipse Integration and perhaps the JRebel Eclipse Debugger Integration from install new Software

  • Make sure you have checked the JRebel Plugin in WOLips if you download the newest version.

  • Restart Eclipse. You will now have a Jrebel preference item in your eclipse preferences and JRebel is ready for use with your projects.

You have now installed and setup the stuff that WOLips needs to know about the location of JRebel.jar.

How do you use it?

Well that has become very simple since the inclusion of Quinton Dolan's JRebel plugin in WOLips.

For a project in which want to use jrebel to change java code while running, go to the run configuration of the project, under the contextual menu Run As->Run Configurations.

In the Run Configuration of a WOApplication you will notice an extra Tab, called JRebel.

Select the tab, and check the check boxes to enable JRebel Agent and (eventually) Enable debug logging.

Start you project from the Run Configuration.

Suddenly, you will get messages about jrebel being loaded, and some extra information about what settings are available as extra arguments.

If you get out of memory error with respect to "Perm Gen space", just allocate more Perm Gen memory in command line launch args in your launch configuration. For example:

-XX:MaxPermSize=384m

Start changing your java code on the fly: watch and start saving time.

  • Profit! (for the europeans: Extra Time Off!)

More information

Old screencast from David Avendasora about using JRebel with Eclipse 3.4.

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