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Learning Scala - Code Update without Redeployment via JRebel

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Chee Seng Chua

Posts: 62
Nickname: quai83
Registered: Nov, 2006

Chee Seng Chua is Senior Application Developer for KZEN Solutions Berhad

Learning Scala - Code Update without Redeployment via JRebel

Posted: May 8, 2011 1:42 AM

This post originated from an RSS feed registered with Web Buzz by Chee Seng Chua.
Original Post: Learning Scala - Code Update without Redeployment via JRebel Feed Title: Chee Seng Tech Blog Feed URL: http://chuacheeseng.blogspot.com/atom.xml Feed Description: When you think you are superior, you are being an idiot...	Latest Web Buzz Posts Latest Web Buzz Posts by Chee Seng Chua Latest Posts From Chee Seng Tech Blog

Scala Developer entitles to free license from JRebel, just request it from ZeroTurnaround (http://sales.zeroturnaround.com/), the license will be emailed to you in minutes. You'll need to download and install JRebel as well.

Having done so, you are only 2 steps away from code update without redeployment.

Step 1
Changed your sbt launch script, I have changed mine to:-


#!/bin/sh
java -Xmx1512M -XX:+CMSClassUnloadingEnabled -XX:MaxPermSize=512m -noverify -javaagent:/opt/ZeroTurnaround/JRebel/jrebel.jar -jar /opt/sbt/sbt-launch-0.7.5.jar "$@"

Note that I installed my sbt jar in /opt/sbt/ and JRebel in /opt/ZeroTurnaround/JRebel/.

Step 2
Change your Web Project build class:-


import sbt._
class WebAppBuild(info: ProjectInfo) extends DefaultWebProject(info) {

    val jetty6 = "org.mortbay.jetty" % "jetty" % "6.1.14" % "test" 
    val servletApi = "javax.servlet" % "servlet-api" % "2.5"

    override def jettyWebappPath = webappPath
    override def scanDirectories = Nil
}

That's all for the setup, now you can launch sbt in your project directory and test:-


jetty-run
~ prepare-webapp

Go ahead and change your Servlet source file, upon saving, you can refresh your web browser to see your changes immediately, without the need to redeploy the whole web app.

Read: Learning Scala - Code Update without Redeployment via JRebel

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