问处理EJB中的异常

EN

public class Test {

    ejbMthod1() {
        // This method run under transaction
        // Do some DB operation like update\delete
        if(somecondition) {
            try {
                // JNDI lookup for ejb2
                ejbMethod2();
            }
            catch(Exception ex){
                // Will catching the exception here save the Transaction from rollback ?
                // Is there any way I can avoid this rollback just by handling proper exceptions ?
            }
        }   
    }
}

class Test2 {
    ejbMethod2() {
        // Run under same transaction as caller
        // do some DB operation which can throw many exception i.e. PersistenceException.
    }
}