Why does UserTransaction appear in 2 categories?

[Timothy Toe]

I am trying to understand Valentin Crettaz�s Bean LC Cheat Sheet.

I wonder why does UserTransaction appear in 2 categories :

Tx: access to getUserTransaction()
and
Res: access to UserTransaction ...

Thanks.

[Valentin Crettaz]

Because when programming beans with bean-managed transaction demarcation you have two ways of getting hold of a UserTransaction object:
1. By calling getUserTransaction() on the context object.
2. By looking up in JNDI the UserTransaction object mapped to the java:comp/UserTransaction

[Timothy Toe]

Oh I see.

I was not aware of the 2nd way of getting the UserTransaction object.

This makes me wonder why must there be 2 ways... kind of redundant.

Is this address (java:comp/UserTransaction) in the JNDI fixed ?

Thanks Crettaz.

[Valentin Crettaz]

This makes me wonder why must there be 2 ways... kind of redundant.
Well, yeah, but you know...

Is this address (java:comp/UserTransaction) in the JNDI fixed ?
Yes, it is a requirement of the EJB 2.0 specification.

[Timothy Toe]

Crettaz, Thanks for the reply !!!

If I am a girl, I'll give you a kiss... but unfortunately... I am not.

[Valentin Crettaz]

If I am a girl, I'll give you a kiss... but unfortunately... I am not.
And *unfortunately*, I would not be available anyway

[Arun Krishnamoorthy]

Just to clarify, wouldn't the JNDI context be available under java:comp/env/UserTransaction instead of java:comp/UserTransaction?

[Thiru Thangavelu]

I think java:comp/UserTransaction is correct.