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

Question

I can't get autocompletion to work in Eclipse.

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

File -> Import -> Checkout As a Project -> New Project Wizard.

I chose Enterprise Java Application. Everything seemed to work fine except instead of autocompletion working as I expected I got a popup dialog displaying the message

This compilation unit is not on the build path of a java project.

I've Googled it and everyone says that the project must be a Java project, but it is! What is the problem?

Update

The catalog structure on svn looks like this:

-Project_name   -application      -META-INF        application.xml        MANIFEST.MF   +build   +db   +deploy   +dist   +lib   +properties   +script   -src      -META-INF         someother.xml (datasource info)         persistence.xml         folder hierarchy with source files (should be package)   -web      some folders           .           .      files        .        .      -WEB-INF         faces-config.xml         jboss-web.xml         web.xml      build_win.xml 

How do I tell Eclipse where the source files folder, application.xml, and other configuration xml files are?

Answer 1

When you have a multimodules maven project under a parent project, make sure you're not editing the file in the maven parent project.