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Last modified by Markus Ruggiero on 2017/02/20 21:13
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1 [[JRebel>>url:http://jrebel.com||shape="rect"]] is a tool from [[ZeroTurnaround>>url:http://www.zeroturnaround.com||shape="rect"]] that makes it possible for Java developers to instantly see any code change made to an app //without// redeploying. JRebel lets you see code changes instantly, versioning classes and resources individually and updating one at a time instead of as a lump application redeploy.
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3 === Also take a look at: [[Using DCEVM and Hotswap for rapid turnaround>>doc:WOL.Home.WOLips.Using DCEVM and Hotswap for rapid turnaround.WebHome||shape="rect"]] ===
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5 === How to install and use JRebel ===
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7 * Get a free 30-day license, a[[open source developer license>>url:http://sales.zeroturnaround.com||shape="rect"]] (Get JRebel for free section) or a paid license from [[ZeroTurnaround>>url:http://www.zeroturnaround.com||shape="rect"]]
8 * Put the license file (jrebel.lic) into a directory named .jrebel in your home directory. ( ~~/.jrebel/jrebel.lic )
9 * Get the JRebel plugin. Go to Eclipse->Preferences->Available Software Sites, add [[http:~~/~~/www.zeroturnaround.com/update-site/>>url:http://www.zeroturnaround.com/update-site/||shape="rect"]]
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11 [[image:attach:AddZeroTurnAround.png]]
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13 * Download the Jrebel Eclipse Integration and perhaps the JRebel Eclipse Debugger Integration from install new Software
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15 [[image:attach:InstallSoftware.png]]
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17 * Make sure you have checked the JRebel Plugin in WOLips if you download the newest version.
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19 [[image:attach:UpdateWOLipsWithJRebel.png]]
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21 * Restart Eclipse. You will now have a Jrebel preference item in your eclipse preferences and JRebel is ready for use with your projects.
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23 You have now installed and setup the stuff that WOLips needs to know about the location of JRebel.jar.
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25 == How do you use it? ==
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27 Well that has become very simple since the inclusion of Quinton Dolan's JRebel plugin in WOLips.
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29 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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31 In the Run Configuration of a WOApplication you will notice an extra Tab, called JRebel.
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33 Select the tab, and check the check boxes to enable JRebel Agent and (eventually) Enable debug logging.
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35 [[image:attach:EnableJRebel.png]]
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37 Start you project from the Run Configuration.
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39 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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41 {{info}}
42 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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44 -XX:MaxPermSize=384m
45 {{/info}}
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47 Start changing your java code on the fly: watch and start saving time.
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49 [[image:attach:JRebelWOlipsLog.png]]
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51 * Profit! (for the europeans: Extra Time Off!)
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53 == More information ==
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55 [[Old screencast from David Avendasora about using JRebel with Eclipse 3.4>>url:http://www.wocommunity.org/podcasts/WOJavaRebel_Setup.mov||shape="rect"]].