Eclipse “this compilation unit is not on the build path of a java project”

Question

I can\'t get autocompletion to work on Eclipse.

I\'m working on the project on svn. I set up project in Eclipse by going into

File -> Import -> Checkout As

Answer 1

in my case it's a maven project

delete the project from eclipse leaving the sources close eclipse delete from filesystem

.target/ .classpath .project .settings/ open eclipse Again Import Maven Projects

This solved the problem