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1. Select Window->Preferences as ahown in the figure.
   
   
   
   
   
   
2. Select Java->Build Path->Classpath Variables. Select New.
   
   
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3. Enter the location of your m2repo. My m2repo is located at C:/m2repo. Select Ok.

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   *Name:* M2_REPO *Path:* C:\m2repo

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4. Once done you can see M2_REPO added to your list of ClassPath variables.
   
   
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Setting up the target platform

A extract from Eclipse help about Target Platform "Target Platform refers to the platform against which you are developing and testing your plug-ins. The target platform encompasses the location of the target, the list of plug-ins constituting the target, the target environment and launching arguments."
Following steps need to be performed while configuring the target platform for GEP development.

1. Select Window->Preferences.
   
   
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2. On the next screen select Plug-in Development->Target Platform. Browse to <Local_M2_Repo>/eclipse/eclipse. Select Apply.
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3. Select Ok. This will set up the target platform for our GEP development.
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Importing source code in your Eclipse Workspace

Next step is to import the source code for plug-ins to your workspace. This is the code with which you will be playing all the time.

1. Right Click under Project Explorer and Select Import->Import...
   
   
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2. On the next window select General->Existing Projects into Workspace. Select Next.
   
   
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3. On the import projects window Browse to <GEP_Source_Home>/trunk/plugins. Select Finish.
   
   
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   In case there are some errors try fixing those(consider it as your first step towards working with GEP) or else use the mailing lists.

Run and Debug Configurations

Before you can start running and debusing your code, set up your debug and run configurations.

1. Select Run->Run Configurations.
   
   
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2. On the Run Configurations window Select Eclipse Application and Select New button on the top left.
   
   
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3. Name the new configuration as GEP_DEVELOPMENT. Select Apply.
   
   
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4. Next select the Arguments tab for your GEP_Development run configuration and set the VM arguments as follows

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   -Xms256m -Xmx256m -XX:MaxPermSize=128m

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5. Next select the tracing tab and select the top most 4 jars. See figure below. Select Apply and Run.
   
   
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6. This will launch a new Eclipse window which is nothing but Eclipse + <Your_Plugin_Code>. You can modify the code and each time you can launch your Eclipse Configuration to test the modifications in code.
   
   
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7. TO Debug the code change to Debug Perspective in eclipse and Select Run->Debug Configurations. Select Debug.