title: Class loading when extending an Eclipse plugin with a fragment project does not work
body: <p>I am trying to extend a third-party Eclipse plug-in by using a fragment project. The major reason is that the third party plug-in contains classes having the default (package) modifier and I need to extend them.</p>
  
  <p>Thus, my extensions class must be located in exactly the same package. I create a fragment project containing the same package and put my class into it. Everything works fine when I am using a runtime workspace.</p>
  
  <p>However, if I try to deploy my fragment (e.g., deploying it into the dropins folder of my Eclipse distribution), I am not able to execute the code. Extensions and stuff like that work fine (e.g., I use extensions for a new Run Configuration. However, if I try to instantiate this run configuration I get an error message that the third-party root plug-in was unable to load the class to display my configuration tab group.</p>
  
  <p>Any experience with this kind of problems?</p>