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Reading a .xlsx excel file using XSSF  RSS feed

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Hello, I am trying to create a class which reads an xlsx excel file and counts the number of columns in the file. It uses POI-XSSF, is part of a web-app which runs using jetty, and compiles fine.

However, when it is run, I receive this error when it tries to create the new XSSFWorkbook.

java.lang.NoSuchMethodError: org.apache.poi.xssf.usermodel.XSSFWorkbook.<init>(Ljava/io/InputStream;)V

I have the following JARs on my build path and dependencies for each in my pom.xml file

I have tried downloading many different jar files and nothing seems to get me away from this error.
Help would be much appreciated.
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Sounds like you're using two different sets of of jar files for compilation and runtime, respectively. My usual advice would be to forget about Maven and make sure you can compile and run the code using a simpler build method (Ant file, or even without any build tool).
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