Hi @vogella
I have fixed the issue in SonarLint master (it should be released next week). Feel free to test using this artifact:
https://repox.jfrog.io/repox/sonarsource/org/sonarsource/sonarlint/eclipse/org.sonarlint.eclipse.site/4.4.0.14954/org.sonarlint.eclipse.site-4.4.0.14954.zip
Note that I have not used OSGi services, because I have not found a way to properly react to “close” events to cleanup listeners. So I’m still relying on plugin activator, but moved slow startup code to a separate job (I found several plugins doing the same).