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

Question

When I try to use ctrl+space this error is shown:

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

I see that there are similar topics but my work environment is Eclipse and i pull my project from Git (I import project as general project) and i use Apache Ant. Can anyone help me?

Answer 1

Since you imported the project as a General Project, it does not have the java nature and that is the problem.

Add the below lines in the .project file of your workspace and refresh.

<natures>
      <nature>org.eclipse.jdt.core.javanature</nature>
</natures>

Answer 2

Another alternative to Loganathan Mohanraj's solution (which effectively does the same, but from the GUI):

1. Right-Click on your project
2. Go to "Properties"
3. Choose "Project Natures"
4. Click on "Add"
5. Choose "Java"
6. Click "Apply and Close"