Eclipse: The specified JRE installation does not exist

I had the same problem. This is how I fixed it.

1. Open Eclipse.
2. Go to Preferences.
3. Click Add
4. A Window should popup with this:

5. Select Standard VM.
6. Select Directory
7. Use this path: Library/Java/JavaVirtualMachines/jdk1.7.0_45.jdk/Contents/Home/
8. Click Open
9. Then Finish
10. Right click your Project then click Properties
11. Select Java Build Path then click Add Library
12. Select JRE System Library

13. Click Environments and select the jdk1.7.0_45
14. Finish

This is what you should see if you did it right:

Your run configurations maybe trying to use a specific JRE.

Make sure you are using the correct JRE there.

The problem is generally related to project or plugin-specific runtime configurations that (still) point to some JDK/JRE that is not existing anymore (e.g. after some update or migration).

We had this e.g. with the ANT plugin, where the launch configuration had to be updated (per ant build file), if it was e.g. not set to the default ~ run in same JRE as workspace.

You will find these settings (typicall under the JRE tab) either:

1. in the global plugin configuration under Eclipse -> Window -> Preferences -> ... of your plugin (typing runtime in the Filter section above may help to find it quickly).

2. or it is set in a project/file-specific run configuration which you should see if you go to

   • Eclipse -> Run -> Run configurations... or
   • right click on your project/file and select Run As -> Run Configurations ...

3. or it is set in a project/file-specific external tool configuration (e.g. like used by ANT) which is similarly to be found here:

   • Eclipse -> Run -> External Tools -> External Tools Configuration ... or
   • right click on your project/file and select Run As -> External Tool Configurations ...