Eclipse: The specified JRE installation does not exist

Question

I used to have Eclipse configured well and work fine before. But I just uninstalled it and installed Eclipse Juno again on my Mac OS 10.10 today. But I kept getting this err

Answer 1

I had the problem with one particular run configuration (unittests for one project in my case). In Run Configurations, I selected the troubled run configuration, then the JRE tab, and I could see it was broken (even though I couldn’t tell how it had happened). Selecting the right JRE solved my problem (project JRE in my case, even though this was just my standard JRE and not configured for the project specifically).