title: eclipse errors exist in required projects but editor shows no errors
body: <p>I use eclipse to code in java. My code was running perfectly fine. Finally, i deleted some files which were not needed from my drive.</p>
  
  <p>Right now, I have the source file and the compiled .class files in the correct folders. Also, although I initially had multiple .java files, I am 100% sure that the one I need is there and  also that it doesn't need anything from any other thing. All the imports (i import only from standard libraries) are showing no error.</p>
  
  <p><strong>The problem is that when i make any changes in my .java file, and save it, it does get saved but when I execute the code, it runs just like the old version, i.e. the changes are not reflected in the output.</strong> Also, on clicking 'run', eclipse gives a warning that 'errors exist in required projects' although the editor shows none.</p>
  
  <p>Whats going wrong ? Please help.</p>