Unable to use Jasper

[Emili Calonge]

Hi!

I'm trying to use Jasper reports in Netbeans but I can't get it working.
I've followed lots of tutorials and tried different ways of using it, but I keep getting:

    
javax.servlet.ServletException: java.lang.NoClassDefFoundError: org/apache/commons/collections/ArrayStack

After reading some webpages, it seems that this error has something to do with the following libraries:

commons-beanutils-1.7.jar
commons-collections-2.1.jar
commons-digester-1.7.jar
commons-loggin-1.0.2.jar
itext-1.3.1.jar
poi-3.0.1-FINAL-20070705.jar
jasperReports.jar

But I've added these to Netbeans and it's still not working. If I try to add the libraries to Glassfish, then I start getting errors with log4j.

Anyone can give me any suggestion on how to get Jasper working?

Thank you so much!