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

user_235585 0
Viewed 161669

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?

buildpath svn eclipse
24 Answers

I might be picking up the wrong things from so many comments, but if you are using Maven, then are you doing the usual command prompt build and clean?

Go to cmd, navigate to your workspace (usually c:/workspace). Then run "mvn clean install -DskipTests"

After that run "mvn eclipse:eclipse eclipse:clean" (don't need to worry about piping).

Also, do you have any module dependencies in your projects?

If so, try removing the dependencies clicking apply, then readding the dependencies. As this can set eclipse right when it get's confused with buildpath sometimes.

Hope this helps!

user_6160430

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

user_4803350

You may want to try running eclipse with the -clean startup option - it tries re-building eclipse's metadata of the workspace.

user_1633640

Your source files should be in a structure with a 'package' icon in the Package Explorer view (in the menu under Window > Show View > Package Explorer or press Ctrl+3 and type pack), like this:

Java project in Eclipse

If they are not, select the folder containing your root package (src in the image above) and select Use as Source Folder from the context menu (right click).

Fabian_Steeg_181540

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.

user_4383190

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

nitind_279050

I had same issue after importing maven project consisting of nested micro services. This is how I got it resolved in Eclipse:

  1. Right Click on Project
  2. Select Configure
  3. Select "Configure and Detect Nested Projects"
user_130417420

I solved this by adding projects in Java Build Path

Right click on the project -> properties -> java build path -> Add

enter image description here

user_102150800
Related