A great set of Java EE examples (REST, EntityManager, EJB, CDI, Web Services, JMS, Transactions, Security ...), created by the Tomcat EE guys
If you need more, just request an example.
Thanks Jon for the hint!
Classic Java EE 7 Workshops: Bootstrap, Effective and Architectures, July, 13th-15th
Online workshop: Java EE 7 Bootstrap