NullPointerException « EntityManager « JPA Q&A

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1. EntityManager injection results in NullPointerException    stackoverflow.com

I'm writing my first JEE (EJB + Servlets etc.) application (please note: I'm using Eclipse).
I'm stuck with a problem with EntityManager injection not working, and having some difficulties finding why due ...

2. Null pointer exception while trying to inject entity manager    forum.hibernate.org

I am fairly new to all of this hibernate, and annotations etc... the entity manager is not getting injected. It is always null. Any help would be great, as well as why it is wrong. Thanks No other errors besides the npe. I am using the following: java jdk 1.6.0_23 eclipse helios Hibernate 3 jsf 2.0 and icefaces tomcat v6 server ...