FopFactory throws exception

I copied some code from Apache to see how to use FOP from Java. When i call FopFactory.newInstance(), I get the following:
  
  Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/avalon/framework/configuration/ConfigurationException
      at com.boeing.lsw.asot.reports.RunFOP.outputPdf(RunFOP.java:146)
      at com.boeing.lsw.asot.reports.RunFOP.main(RunFOP.java:201)
  
  To add icing on the cake, Avalon is old technology that's no longer supported. I have the latest fop.jar. Can anyone help?
  
  Thanks,
  Ken
  
       
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