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

Had the same problem (but with Maven). The reason was incorrect choice of executor: my project used global settings that are not avilable from Embedded installation of Maven. Changed it to external (Window -> Preferences -> Maven -> Installations) and that fixed the problem.

Answer 2

Had the same problem. Solution: Context menu -> Maven -> Enable dependency management

Do not know why that was lost, when checking out.

Answer 3

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

Answer 4

Like the message says, is the file somewhere on the project's Java Build Path (e.g. a Source folder)?

Answer 5

mvn eclipse:eclipse

solved my problem

Answer 6

Here the steps for creating a source folder in eclipse.

1. Right click on the project and go to properties
2. Select "Java Build Path" from the properties dialog box
3. Select the source tab and check that the source folders are correct if not click on the remove button to remove source folders, or the add button to add source folders.

You can control the order in which source folders appear in a project on order and export tab on the configure build path option.