The @EJB is used to inject EJB’s only and is available for quite some time now. @Inject can inject any managed bean and is a part of the new CDI specification (since Java EE 6).
In simple cases you can simply change @EJB to @Inject. In more advanced cases (e.g. when you heavily depend on @EJB‘s attributes like beanName, lookup or beanInterface) than in order to use @Inject you would need to define a @Producer field or method.
These resources might be helpful to understand the differences between @EJB and @Produces and how to get the best of them:
Antonio Goncalves’ blog:
CDI Part I
CDI Part II
CDI Part III
JBoss Weld documentation:
CDI and the Java EE ecosystem
StackOverflow:
Inject @EJB bean based on conditions