title: Where can I find a set of Java test programs with injected errors?
body: <p>I need some fairly simple Java test programs with injected errors in order to test something I'm working on on them.</p>
  
  <p>Edit: By "injected errors" I mean broken algorithms, errors that may cause the program to crash, and so on...</p>
  
  <p>Edit2: I'm making something that tries to give some hints to the programmer about the cause of the error, so the programs should be fairly simple and contain known errors in them.</p>