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Transaction Attribute Settings
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A transaction attribute supports declarative transaction demarcation and conveys to the container the intended transactional behavior of the associated EJB component s method. Six transaction attributes are possible for container-managed transaction demarcation:
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n NotSupported [or @TransactionAttribute(NOT_SUPPORTED) annotation in EJB 3.0] The bean runs outside the context of a transaction. Existing transactions are suspended during method calls. The bean cannot be invoked within a transaction. An existing transaction is suspended until the method called in this bean completes. n Required [or @TransactionAttribute(REQUIRED) annotation in EJB 3.0] Method calls require a transaction context. If a transaction already exists, the bean will use it; if a transaction does not exist, it will be created. The container starts a new transaction if no transaction exists. n Supports [or @TransactionAttribute(SUPPORTS) annotation in EJB 3.0] Method calls use the current transaction context if one exists, but they don t create one if none exists. The container will not start a new transaction. If a transaction already exists, the bean will be included in that transaction. Note that with this attribute, the bean can run without a transaction.
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n RequiresNew [or @TransactionAttribute(REQUIRES_NEW) annotation in EJB 3.0] Containers create new transactions before each method call on the bean and commit transactions before returning. A new transaction is always started when the bean method is called. If a transaction already exists, that transaction is suspended until the new transaction completes. n Mandatory [or @TransactionAttribute(MANDATORY) annotation in EJB 3.0] Method calls require a transaction context. If one does not exist, an exception is thrown. An active transaction must already exist. If no transaction exists, the javax.ejb.TransactionRequired exception is thrown. n Never [or @TransactionAttribute(NEVER) annotation in EJB 3.0] Method calls require that no transaction context be present. If one exists, an exception is thrown. The bean must never run with a transaction. If a transaction exists, the java.rmi.RemoteException exception is thrown.
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A container can manage multiple transactions in two different ways: The container could instantiate multiple instances of the bean, allowing the transaction management of the DBMS to handle any transaction processing issues. Conversely, the container could acquire an exclusive lock on the instance s state in the database, serializing access from multiple transactions to this instance.
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The JTS specifies the implementation of a transaction manager supporting the JTA. JTS also implements the Java mapping of the Object Management Group s (OMG) Object Transaction Service (OTS). The EJB specification suggests but does not require transactions based on the JTS API. JTS supports distributed transactions, which have the ability to span multiple databases on multiple systems coordinated by multiple transaction managers. By using JTS, an EJB container ensures that its transactions can span multiple EJB containers.
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EJB applications communicate with a transaction service using the JTA, which provides a programming interface to start transactions, join existing transactions, commit transactions, and roll back transactions. When a bean with bean-managed transactions is invoked, the container suspends any current transaction in the client s context. In its method implementation,
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the bean will initiate the transaction through the JTA UserTransaction interface. In stateful beans, the container will associate the bean instance with the same transaction context across subsequent method calls until the transaction is explicitly completed by the bean. However, stateless beans aren t allowed to maintain transaction context across method calls. Each method invocation is required to complete any transaction it initiates.
Entity Bean Methods and Transaction Attributes
All developer-defined methods in the remote interface as well as all methods defined in the home interface (such as create(), remove(), and finder() methods) require transaction attributes. Note that entity beans have to use container-managed transactions (CMTs).
Session Bean Methods and Transaction Attributes
All developer-defined methods in the remote interface require transaction attributes. Transaction attributes are not needed for the methods in the home interface. Methods in the remote interface run with the NotSupported attribute by default. Transaction attributes are also not needed for the methods in a session bean if you re using bean managed transactions (BMTs).
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