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Getting Stuff from the Container

Generally speaking the only way to get a container controlled resource is via dependency injection or lookup from within a container managed component. Dependency injection can be configure equally via xml or annotations (see @.

InitialContext Lookups

  • Server side beans should access other beans on the server via the default no args constructor. EJB 3 spec 15.3.1 Bean Provider's Responsibilities
  • The lookup names must be preceded with "java:comp/env", as in "java:comp/env/myBean". e.g. 
    initialContext.lookup("java:comp/env/beanName")
  • Clients is a good reference for more complex lookups, including authentication.

Injection

  • @EJB is syntactic sugar for 
    initialContext.lookup("java:comp/env/beanName")
  • EJB Refs is a good reference for injection via xml or annotations
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