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5.2 Handling transaction management without the container 5.4 Attempting error recovery to avoid a rollback 5.5 Forcing rollbacks before method completion 5.10 Managing EJB state after a rollback
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Using more than one transaction in a method
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5.9 Using more than one transaction in a method
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In a single business method, you want to make use of more than one transaction.
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With container-managed transaction beans, you are limited to a single transaction per method. You would like to group some important sections of code into a single method but use multiple transactions within the entire method. You need transaction control like this if you have a method that contains critical sections of code that cannot be broken into separate methods for CMT control. This enables you to roll back a small section of code and exit the method without executing the remaining method. This applies only to session beans, because entity beans must always use container-managed transactions.
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Change your session bean to manage its own transactions by altering its XML descriptor. For example, the following code sets up a UserBean EJB for bean-managed transactions:
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<session> <description>Example</description> <ejb-name>User</ejb-name> <home>UserHome</home> <remote>User</remote> <ejb-class>UserBean</ejb-class> <session-type>Stateful</session-type> <transaction-type>Bean</transaction-type> </session>
Create transactions around your important code sections as needed. For example, the business method in listing 5.7 uses multiple transactions.
Listing 5.7 Sample business method
public void businessMethod() { UserTransaction transaction = null; try { transaction = ejbContext.getUserTransaction(); transaction.begin(); //perform important code
Transactions
transaction.commit(); }catch( Exception e ) { //need to rollback if( transaction == null ) transaction.rollback(); } //start next section of important code try { transaction = ejbContext.getUserTransaction(); transaction.begin(); //perform important code transaction.commit(); }catch( Exception e ) { //need to rollback if( transaction == null ) transaction.rollback(); } }
Discussion
At times, you need a finer-grained control of transactions than the singletransaction-per-business method provided by container-managed transactions. If this is the case, it makes sense to change your session beans to bean-managed transactions. By managing transactions on your own, you can create as many as you need within a single method. This gives you the ability to specify small rollbacks, attempt to recover from errors, and provide specific explanation of exceptions. In a situation like this, you may even consider using nested transactions starting one transaction while executing within another. Unfortunately, this type of transactional programming is not allowed. Possibly in the future we will see the EJB specification modified to handle this behavior. For clarification, an EJB that declares its transactional behavior with RequiresNew called within another transaction is not an example of nested transactions. The containing transaction is suspended while the new one executes, and resumes when the new transaction completes. The inside transaction does not affect the first transaction. For EJBs, transactions are either suspended or propagated.
Managing EJB state after a rollback
See also
5.1 Tuning the container transaction control for your EJB 5.12 Propagating a transaction to another EJB business method 5.13 Propagating a transaction to a nonEJB class
5.10 Managing EJB state after a rollback
Problem
You want to make sure your EJB s have correct state variables after a rollback completes.
Background
After a rollback has occurred, a stateful session EJB must reset its state to what it was before the rolled-back transaction began execution. The goal of a rollback is to restore an EJB state to the pre-transaction version, ensuring that new transactions can start with the correct state. You need your EJB to know when a transaction rollback has occurred within a method, and you want to restore the EJB state before a new transaction can start.
Recipe
To reset the state for a session bean after a rollback, implement the javax.ejb
.SessionSynchronization interface shown in listing 5.8.
Listing 5.8 SampleBean.java
public class SampleBean implements SessionBean, SessionSynchronization { public void afterBegin() throws RemoteException { //Transaction has started } public void beforeCompletion() throws RemoteException { //Transaction is about to complete } public void afterCompletion( boolean committed ) throws RemoteException { //test for rollback
Transactions
if( !committed ) restoreState(); //invoke bean method to restore state } //implementation of the EJB below }
For entity beans, don t do anything. The container will invoke ejbLoad() on the entity bean and restore it to its original state before the transaction.
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