title: reading excel file --> xlsx format with java
body: <p>I'm trying to read an excel file (xlsx NOT xls) but without any luck.
  I tried the jexcel api but it doesn't support xlsx extension, then I tried the Apache api which need to work and tried also the example from their web site but with no luck.I can't pass the read file phase and get a filenotfound exception.
  also used the poi-ooxml-3.6.jar,xmlbeans-2.6.0 and poi-3.7.jar.</p>
  
  <p>can anyone please explain to me what types of api/classes/libraries I need to use  and how to use it with eclipse (the external libraries/classes/api is totally new to me)</p>
  
  <p>many thanks in advance</p>