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Compare the interface:
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Every method in the home interface corresponds to an method in the bean class The signatures of the methods in the class follow:
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Home Interface
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The number and types of arguments in a method must match those of its corresponding method method must be valid RMI The arguments and return type of the types method returns the remote interface type of the enterprise bean A (But an method returns )
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THE CARTEJB EXAMPLE
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A SESSION BEAN EXAMPLE
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Remote Interface
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The remote interface, which extends , defines the business methods that a remote client may invoke Here is the source code for the remote interface:
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The method definitions in a remote interface must follow these rules: Each method in the remote interface must match a method implemented in the enterprise bean class The signatures of the methods in the remote interface must be identical to the signatures of the corresponding methods in the enterprise bean class The arguments and return values must be valid RMI types clause must include the The
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Helper Classes
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session bean has two helper classes: and The is thrown by the method and the validates the in one of the methods Helper classes must reside in the EJB JAR file that contains the enterprise bean class
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Running the CartEJB Example
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THE CARTEJB EXAMPLE
2 In open the file (File Open) You should see the application that is displayed in Figure 4 1 application (Tools Deploy) In the Introduction dia3 Deploy the log box, make sure that you select the Return Client JAR checkbox For detailed instructions, see Deploying the J2EE Application, page (37) 4 Run the application
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A SESSION BEAN EXAMPLE
Other Enterprise Bean Features
The topics that follow apply to both session and entity beans
Accessing Environment Entries
Stored in an enterprise bean s deployment descriptor, an environment entry is a name-value pair that allows you to customize the bean s business logic without changing its source code An enterprise bean that calculates discounts, for example, might have an environment entry named Before deployand assign ing the bean s application, you could run a value of 05 on the Env Entries tab (See Figure 4 2) When you run the application, the enterprise bean fetches the 05 value from its environment
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