Hi,
In order for the tutorial to work you will need :
Every jar found in lib/required directory :
antlr-2.7.6.jar
commons-collections-3.1.jar
dom4j-1.6.1.jar
javassist-3.4.GA.jar
jta-1.1.jar
slf4j-api-1.5.2.jar
Plus :
log4j-1.2.15.jar
hsqldb.jar
dom4j-1.6.1.jar
slf4j-log4j12-1.5.5.jar
jcl-over-slf4j-1.5.5.jar
simple-log-2.0.1.jar
You shouldn't have difficulty finding those. Maybe I went a little overboard, but at least now it works :D Some JARs might be useless, you should try removing them one by one to be sure, but this package should be enough for the tutorial to work.
Hope this helped,
François