title: In Eclipse, the changes of my source code have no effect
body: <p>I have a strange problem in Eclipse Helios. When I alter my source code, my changes have no effect. Even if I alter the code in a way that looks uncompilable, it still can be run.</p>
  <p>It seems that Eclipse keeps its state somewhere in the background while I edit and save my sources and commit them to svn.</p>
  <p>I don't know what setting to look up or what else to do. I'd be glad to receive any help.</p>