title: Unable to use POI HSSF library in Eclipse plugin development
body: <p>I am developing an Eclipse plugin to create and perform operations on excel files and I am not able to use the POI HSSF library for the same. 
  I have downloaded the <em>poi-3.7-20101029.jar</em> file. When I tried using this in an independent java application by adding it in the configure build path, the thing worked. But when I tried using the same during developing the plugin in the Eclipse PDE, I get a <em>NoClassDefFound</em> exception for the HSSFWorkbook class. I have added the POI plugin in the build path (and confirmed that the plugin contains the HSSFWorkbook class) as well as imported the HSSFWorkbook class. </p>
  
  <p>Could someone tell me what I am doing wrong here? Is there something else I need to add or modify while using the POI library in plugin development? Should I add the library as dependencies in the Manifest file?</p>
  
  <p>Thanks and Regards...  </p>
  
  <p>Swaraj</p>