title: how to find the jar file containing a class definition?
body: <p>Is there a tool, plugin, or script I can use to find a java class in a bunch of jar files?</p>
  
  <p>Very often I inherit code that complains about a class that doesn't exist, and it is just because the jar file is not included in the classpath. But, in what jar file(s) is the class? I may not have the JAR (so I have to search online), or adding a JAR to the classpath could create a duplicated class definition problem.</p>
  
  <p>I obviously would prefer an eclipse plugin, but I'm open to any piece of software that works with Windows.</p>
  
  <p>I know... Windows is not my choice, but that's what I got to work with.</p>
  
  <p>Thanks!</p>
  
  <p>Luis</p>
  
  <p>P.S. Thank you for your answers. After reviewing some responses, I became aware that I should have explained better my scenario. We had a library of downloaded or created JAR files, but sometimes the class would be online somewhere. </p>