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Summary of Transaction Attributes
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Table 14 1 summarizes the effects of the transaction attributes Both the T1 and T2 transactions are controlled by the container A T1 transaction is associated with the client that calls a method in the enterprise bean In most cases, the client is another enterprise bean A T2 transaction is started by the container just before the method executes In the last column of Table 14 1, the word None means that the business method does not execute within a transaction controlled by the container However, the database calls in such a business method might be controlled by the transaction manager of the DBMS Table 14 1 Transaction Attributes and Scope
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Transaction Attribute
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Client s Transaction
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Table 14 1 Transaction Attributes and Scope (Continued)
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Transaction Attribute
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None T1 None T1 None T1 None T1 None T1
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Because transaction attributes are stored in the deployment descriptor, they can be changed during several phases of J2EE application development: enterprise bean creation, application assembly, and deployment However, as an enterprise bean developer, it is your responsibility to specify the attributes when creating the bean The attributes should be modified only by an application developer who is assembling components into larger applications Do not expect the person who is deploying the J2EE application to specify the transaction attributes You can specify the transaction attributes for the entire enterprise bean or for individual methods If you ve specified one attribute for a method and another for the bean, the attribute for the method takes precedence When specifying attributes for individual methods, the requirements differ with the type of bean Session beans need the attributes defined for business methods, but do not allow them for the methods Entity beans require transaction attributes for the , , and finder methods Message-driven beans require business, transaction attributes (either or ) for the method
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method of the example illustrates the method If a negative checking balance occurs, invokes and throws an application exception ( ) The and methods update database tables If the updates fail, these methods throw a and the method throws an Because the is a system exception, it causes the container to automatically roll back the transaction Here is the code for the method: