THE DUKE S BANK APPLICATION in Java

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THE DUKE S BANK APPLICATION
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session bean has two methods The method returns all of the accounts of a given customer by invoking the method of the entity bean Instead of method for every instance variable, the implementing a has a method that returns an object ( ) that bean Because it can invoke a sinencapsulates the entire state of an gle method to retrieve the entire state, the client avoids the overhead associated with multiple remote calls
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CustomerControllerEJB
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Because it is the bean that manages the customeris the simpler of these two sesaccount relationship, sion beans A client creates a entity bean by invoking the method of the session bean To remove a customer, the client calls the method, which not only invokes the method of , but also deletes from the table all rows that identify the customer The session bean has two methods that return multiple customers: and These methods call the corresponding finder methods and of
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session bean handles bank transactions In addition to its methods, and , the bean has several methods that change the balances of the bank accounts:
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These methods access an entity bean to verify the account type and to set the new balance The and methods are for non-credit accounts, whereas the and methods are for credit accounts If the method argument does not match the account, these methods throw an If a withdrawal were to result in a negative balance, then the method throws an
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If a credit charge attempts to exceed the account s credit line, the method throws an
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method also checks the account type and new balance; if The necessary, it throws the same exceptions as the and methods The method subtracts from the balance of one instance and adds the same amount to another instance Because both of these steps must complete, the method has a transaction attribute If either step fails, the entire operation is rolled back and the balances remain unchanged
Entity Beans
For each business entity represented in our simple bank, the Duke s Bank application has a matching entity bean: