EJB Cookbook by Benjamin G Sullins, Mark B Whipple

By Benjamin G Sullins, Mark B Whipple

Simply as cookbooks comprise step by step instructions for growing assorted dishes, this booklet comprises recipes for fixing difficulties bearing on company JavaBeans. issues addressed diversity from uncomplicated, daily concerns to advanced layout matters utilizing EJB styles. meant for builders with a few EJB improvement event, an knowing of the thoughts of company improvement and the fundamentals of EJB programming is thought. This publication truly addresses difficulties and concerns and avoids using EJB keyword phrases, making it excellent for builders who wish speedy recommendations to common problems-or easily EJB improvement principles. Easy-to-find recipes diversity from the typical to the complicated and contain options for securing a message-driven bean, producing EJB code, and bettering an entity bean endurance layer.

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Example text

Each particular application server generally has an additional configuration step for EJB deployment. For example, Weblogic uses an additional XML file to describe the behavior of EJBs. 11 contains a sample partial XML document for the message bean that specifies the actual JMS topic for the EJB. 11 Weblogic deployment descriptor myMessageBean BookJMSTopic myMessageBean ◆ Discussion Our example message bean attempts to extract a command string from JMS messages it receives.

If the applet was a signed applet, it could contact other hosts. To ensure that this applet creates the correct JNDI environment for the InitialContext instance, we use the getCodeBase() method to retrieve the correct URL information. The second important item for this example is contained in the HTML used to launch the applet. An applet that launches an EJB is going to need the EJB classes (stubs and interfaces), as well as vendor-specific classes used to create the JNDI environment. For instance, our applet uses Weblogic classes.

For example, you may need to know if two entity beans encapsulate the same data, or if two session bean references are identical. Clients cannot use an equals() method from 24 CHAPTER 1 Client code an EJB reference because of the nature of EJB deployment. EJB references point to stub objects that may be different stub instances yet point to the same EJB. An equals() invocation is not guaranteed to return the correct value. ◆ Recipe Use the isIdentical() method from the remote or local interface to compare EJB references.

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