Setting up Eclipse 3.4 for Sling has been edited by Mike Mueller (Apr 16, 2009).

(View changes)


To setup the Eclipse IDE to work with the Sling project properly seems to be not very straightforward at a first look, but be calm, it's not rocket science to do. This little manual should help you to setup Eclipse for Sling fast.


  • Installed Eclipse Ganymede (tested with 3.4.2 on Win XP, SP3)
  • Installed Maven2 (tested with 2.1.0)
  • Installed M2Eclipse plugin for Eclipse (sonytype) -> instructions
  • Installed Subversive plugin or Subclipse-plugin for Eclipse

If you use the Subversive plugin make sure you have installed the "Subversive Integration for M2Eclipse Project" which can be found under the following Eclipse update site:

Make also sure, that you have installed either the "Maven SCM handler for Subclipse" or the "Maven SCM handler for Subversive"

Create a new workspace

It's best to create a new workspace for the sling project:

  1. Menu: File->Switch Workspace->Other...
  2. Enter a path for the new workspace and click OK
  3. When Eclipse has restarted its time to adjust some configs
  4. Turn off automatic build (Menu: Project->Build Automatically)
  5. Go to menu: Window->Preferences, in the preferences dialog select Java -> Compiler -> Errors/Warnings
  6. Expand the "Deprecated and restricted API" and change  "Forbidden references (access rules)" from "Error" to "Warning"
  7. Click OK 

Get the Sling source

  1. Menu: File->Import
  2. In the Import wizard select Maven->"Check out Maven Projects from SCM"
  3. Click next
  4. In the "SCM URL" field pick "SVN" and enter the url ""
  5. Click Finish

Eclipse will now start to download the source and import the Maven projects. You might encounter some "Problem Occured" dialogs about "An internal error..." but just click OK on those and let Eclipse continue with the import. Be warned: This could take some time (it was 30 minutes on my lap)!

Maybe something in sling-builder gets a bit messed up (I didn't ran into that problem, but Pontus reported that) then you can simply fix it with revert:

  1. In the Project Explorer right click on the "sling-builder" project and select the Team->Revert... menu
  2. A couple of changes will be displayed
  3. Click OK

Build Sling

  1. Make sure you're in the Java perspective (Menu: Window->Open Perspective)
  2. Menu: Run->Run Configurations...
  3. In the Run Configurationa dialog right click on "Maven Build" and select "New"
  4. Change Name to "Build Sling"
  5. Click "Browse Workspace..." and select "sling-builder"
  6. Enter "clean install" in Goals
  7. Click on the JRE tab
  8. Enter "-Xmx256m -XX:MaxPermSize=128m" in "VM arguments"
  9. Click Apply
  10. Click Run

This should build Sling.

Debug Sling in Eclipse

You can use remote debugging to debug Sling in Eclipse, here's a little How-To

  1. start Sling from the command line with
    "java -Xmx384M -Xdebug -Xnoagent -Djava.compiler=NONE -Xrunjdwp:transport=dt_socket,address=30303,server=y,suspend=n -jar"
  2. Open Menu Run-> Debug configurations
  3. Right click on "Remote Java Applications"
  4. Choose "New"
  5. in the "Connect" tab enter in the field "Project"
  6. Let the Connection type be "Standard (Socket Attach)"
  7. the host should be localhost
  8. set the Port to 30303
  9. On the source tab click on the "Add" button
  10. Select "Java Project"
  11. Select all Sling projects and click OK
  12. Click "Debug"

No you should be able to set breakpoints, evaluate properties, and so on as usual.

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