Eclipse Open declaration in Java project

Question

In an Eclipse SVN project I have a problem; when I tried to open a declaration of one class, I got this error:

Problems opening an editor Reason : projectna         


        

Answer 1

It might lack a builder. Check your PROJ_HOME/.project that should be like:

    the-one-user
    
    
    
    
        
            org.eclipse.jdt.core.javabuilder
            
            
        
    
    
        org.eclipse.jdt.core.javanature
    

Ref: FAQ How do I add a builder to a given project?