title: In Eclipse, what can cause Package Explorer "red-x" error-icon when all Java sources compile without errors?
body: <p>I'm using Eclipse for Java development. All my sources compile fine and the resulting application compiles fine. However, I keep getting an "red-x" error notification in the Package Explorer.</p>
  
  <p>All my sources in this source directory (too long for the snapshot) compile fine, none of the show the "red-x" error icon.</p>
  
  <p>Any suggestions on how to fix the problem would be highly appreciated.</p>