Eclipse Cannot create in-place editor

Question

I have a troubleshoot problem. My eclipse don\'t want open class in the package editor.

Error, what i\'m having -

Answer 1

Had the same issue with .HTML files.

Despite my File Associations were correctly set, the following is a workaround that solved the problem:

1. Right Click on the file of your project -> Open with
2. Check other Internal Editor -> select the Editor of your choice (my case = HTML Editor)
3. At the bottom, check "Use this editor for all ... files" + "Use it for all.."