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With this setting, if the transaction has not completed within 5 seconds, the EJB container rolls it back When the J2EE SDK is first installed, the timeout value is set to 0:
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If the value is 0, the transaction will not time out Only enterprise beans with container-managed transactions are affected by the property For enterprise beans with bean-managed JTA transactions, you invoke the method of the interface
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Isolation Levels
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Transactions not only ensure the full completion (or rollback) of the statements that they enclose but also isolate the data modified by the statements The isolation level describes the degree to which the data being updated is visible to other transactions Suppose that a transaction in one program updates a customer s phone number, but before the transaction commits another program reads the same phone number Will the second program read the updated and uncommitted phone number or will it read the old one The answer depends on the isolation level of the transaction If the transaction allows other programs to read uncommitted data, performance may improve because the other programs don t have to wait until the transaction ends But there s a trade-off if the transaction rolls back, another program might read the wrong data You cannot modify the isolation level of entity beans with container-managed persistence These beans use the default isolation level of the DBMS, which is usually For entity beans with bean-managed persistence and for all session beans, you can set the isolation level programmatically with the API provided by the underlying DBMS A DBMS, for example, might allow you to permit uncommitted reads by invoking the method:
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Do not change the isolation level in the middle of a transaction Usually, such a change causes the DBMS software to issue an implicit commit Because the isolation levels offered by DBMS vendors may vary, you should check the DBMS documentation for more information Isolation levels are not standardized for the J2EE platform
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The J2EE transaction manager controls all enterprise bean transactions except for bean-managed JDBC transactions The J2EE transaction manager allows an enterprise bean to update multiple databases within a transaction The figures that follow show two scenarios for updating multiple databases in a single transaction
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In Figure 14 2, the client invokes a business method in The business method begins a transaction, updates Database X, updates Database Y, and invokes a business method in The second business method updates , which comDatabase Z and returns control to the business method in mits the transaction All three database updates occur in the same transaction
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Figure 14 2 Updating Multiple Databases
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In Figure 14 3, the client calls a business method in , which begins a transaction and updates Database X Then, invokes a method in , which resides in a remote J2EE server The method in updates Database Y The transaction managers of the J2EE servers ensure that both databases are updated in the same transaction
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Figure 14 3 Updating Multiple Databases across J2EE Servers
Transactions in Web Components
You may demarcate a transaction in a Web component with either the or interface These are the same interfaces that a session bean with bean-managed transactions may use Transactions demarcated with the interface are discussed in the section JDBC Transactions, page (324) and those with the interface are discussed in the section JTA Transactions, page (325) For an example of a Web component using transactions, see Accessing Databases, page (221)
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