The documentation for Creating Transactional Web Services references examples, put is not specific enough about where to find the examples. For example this page of the documentation, [1], references two files, [2], and [3], which are hard to find because it doesn't say where to find them. The relevant documentation for EAP 5.1 can be found here [4].

[1] http://docs.redhat.com/docs/en-US/JBoss_Enterprise_Application_Platform/5/html/Transactions_Development_Guide/ch19s03s02.html
[2] dd/jboss/context-handlers.xml
[3] src/com/jboss/jbosstm/xts/demo/services
[4] http://anonsvn.jboss.org/repos/labs/labs/jbosstm/tags/JBOSSTS_4_6_1_GA_CP04/XTS/demo/