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Use of UserTransaction

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I have a 3 doubts. I implements the client (servlet) that get the userTransaction of Context using this code:

UserTransaction userTrx = (UserTransaction)jndiCtx.lookup("jta/usertransaction");
String temp = null;

temp = "value";

My doubt is: The value of temp will "value" or null ?

What is the advantage of use transaction without EJB ?

I can controll in the rollback of the object UserTransaction (get with lookup of context) the command rollback of transaction of DB together without use EJB ?

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Using a JTA transaction only affects resources that can be "enlisted" in the transaction: JDBC connections, JMS queues, etc. While you could certainly write code that would wrap a String and make it transactional, that's not a part of standard Java.
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UserTransaction interface gives control to you,to manage your transaction in your program and container won't take care of Transaction Management.


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