How to use sbt with Google App Engine?

Question

Has anybody tried to setup sbt to work with Google App Engine? I dream about using development server auto-reloading after source changes.

Answer 1

For a quick demo you can clone or download what I have done here.

A minimalistic sbt-appengine-plugin example from scratch

Clone the sbt-appengine-plugin from GitHub

 cd mystuff
 git clone git://github.com/Yasushi/sbt-appengine-plugin.git
 cd sbt-appengine-plugin
 sbt

Publish the plugin locally so that you can use it in your own projects

publish-local
exit

Create a directory for a new project

cd ..
mkdir sbt-appengine-plugin-test
cd sbt-appengine-plugin-test
sbt

Configure the new project

Project does not exist, create new project? (y/N/s) y
Name: sbt-appengine-plugin-test
Organization: com.example
Version [1.0]: 
Scala version [2.7.7]: 2.8.0.Beta1
sbt version [0.7.3]:
exit

Tell sbt about the plugin you want to use

mkdir project/build
mkdir project/plugins
nano project/build/project.scala

project.scala

import sbt._

class AppengineTestProject(info: ProjectInfo) extends AppengineProject(info)

nano project/plugins/plugins.scala

plugins.scala

import sbt._

class Plugins(info: ProjectInfo) extends PluginDefinition(info) {
  val a = "net.stbbs.yasushi" % "sbt-appengine-plugin" % "1.1-SNAPSHOT"
}

Add a very simple servlet

mkdir -p src/main/scala/com/example
nano -w src/main/scala/com/example/HelloWorld.scala

HelloWorld.scala

package com.example;

import javax.servlet.http.{HttpServlet, HttpServletRequest, HttpServletResponse}

class HelloWorld extends HttpServlet {
  override def doGet(request: HttpServletRequest, response: HttpServletResponse$
    response.setContentType("text/plain")
    response.getWriter.println("Hello, world")
  }
}

Add some more configuration files

mkdir -p src/main/webapp/WEB-INF
nano -w src/main/WEB-INF/web.xml

web.xml

  sbt-appengine-plugin usage example
      
    helloworld
    com.example.HelloWorld
  
      
    helloworld
    /
  



nano -w src/main/WEB-INF/appengine-web.xml

appengine-web.xml

     
 

        
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