SonarException: The project is already been analysing.

I was getting this error when running a Sonar analysis recently.

This was caused by the Jenkins/Sonar process getting killed while the project analysis is underway. Sonar now uses a database semaphore to prevent multiple builds running at the same time, but if the job gets terminated then the semaphores don’t get cleaned up.

To fix the problem: Log into the database and delete any rows in the ‘semaphores’ table.

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