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Version 31.1 by Kieran Kelleher on 2010/09/07 19:39
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1 JRebel (previously called javarebel is a tool from [[ZeroTurnaround>>http://www.zeroturnaround.com]]).
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3 It is a java library that makes it possible to change java code while running a project in WOLips and see the results without having to restart. It is a great timesaver.
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5 If you are running Eclipse 3.4, you should have a look at the screencast from David Avendasora at [[http://www.wocommunity.org/podcasts/WOJavaRebel_Setup.mov]].
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7 If you are running WOLips 3.5.1 or bigger, you are lucky: the JRebel plugin is included in the current WOLips for there versions.
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9 === How to install and use JRebel ===
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11 * Download you version from [[ZeroTurnaround>>http://www.zeroturnaround.com]]
12 * put the jrebel.jar somewhere nice, so you can use it in whatever project you are working
13 * Go to WOLips->Preferences->Install Software, add [[http://www.zeroturnaround.com/update-site/]]
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15 [[image:AddZeroTurnAround.png]]
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17 * Download the Jrebel Eclipse Integration and perhaps the JRebel Eclipse Debugger Integration from install new Software
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19 [[image:InstallSoftware.png]]
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21 * Make sure you have checked the JRebel Plugin in WOLips if you download the newest version.
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23 [[image:UpdateWOLipsWithJRebel.png]]
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25 * Restart Eclipse. You will now have a Jrebel preference item in your eclipse preferences
26 * Goto to Preferences->JRebel, and point the Path to jrebel.jar to the jrebel.jar location from action 2.
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28 [[image:PathToJRebel.png]]
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30 You have now installed and setup the stuff that WOLips needs to know about the location of JRebel.jar.
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32 == How do you use it? ==
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34 Well that has become very simple since the inclusion of Quinton Dolan's JRebel plugin in WOLips.
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36 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.
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38 In the Run Configuration of a WOApplication you will notice an extra Tab, called JRebel.
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40 Select the tab, and check the check boxes to enable JRebel Agent and (eventually) Enable debug logging.
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42 [[image:EnableJRebel.png]]
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44 Start you project from the Run Configuration.
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46 Suddenly, you will get messages about jrebel being loaded, and some extra information about what settings are available as extra arguments.
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48 {{info}}
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50 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:
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52 -XX:MaxPermSize=384m
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55 {{/info}}
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57 Start changing your java code on the fly: watch and start saving time.
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59 [[image:JRebelWOLipsLog.png]]
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61 * Profit (for the europeans: Extra Time Off)