I have installed the sonar eclipse plugin in eclipse Juno. I put the groupid and the artifactid into the proper lines, however I get an error:
Unknown exception
How to configure the sonar plugin properly in eclipse?

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You need to install Sonar on a server (or run it on your machine for testing). Then you need to configure it in the Eclipse properties and choose it from the drop-down in the associate with sonar dialog (unless it runs on your machine, in which case it is already available from the drop down).
Before you can associate a project with sonar, you need to run the sonar analysis on that project (usually using maven). Take a look at the sonar documentation to get more information.