Reading the excellent Yuan/Heute book, he talks about the fact that 
transactions are enabled by default for all EJB 3 session beans. The 
transaction begins when the conversation begins, and ends when the conversation 
ends. It goes on to talk about POJO transactions, this is where it gets a bit 
confusing.

POJOs have two transactions, the first spanning the beginning of the update 
model values, the second spans the render phase. Does this reflect the fact 
that the default conversation goes from the request to the full rendering of 
the next page? 

Using POJOs, is it correct to say that if you start a conversation, the 
transaction won't finish until that conversation is ended, just like with EJBs?



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