Are you referring to the booking example? 

The reason why it works in the example is because of this little bit of code in 
the AuthenticatorBean:

@Out(required=false, scope = SESSION)
   private User user;

when a user logs in the user entity is outjected to session scope, allowing it 
be used by other beans. When you think about it it makes sense that an 
exception is thrown, how can you inject the current user if they have not 
logged in yet?

@In without create=true is basically saying that you want an initialized User 
injected, with create=true you are saying that you do not care if it has been 
initialized or not, you just want a user.

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