I've hit another problem (and solved it) with the instructions.
Problem: I tried to build the address module (by running '# maven' in the /j2ee-maven/maven-petstore-1.4/modules/address directory) but I hit a problem due to a lack of the xmldocuments-1.4.jar dependency. This does not exist in the ibiblio repository.
Solution: However, I cd'd to ./../xmldocuments directory, ran '# maven' there and this compiled and deployed the required jar to my local repository. Then I went back to the addresses module and the example ran as required.
Hope this helps.