rdlc gs1 128

rdlc gs1 128

rdlc ean 128

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rdlc ean 128,

rdlc ean 128,
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rdlc gs1 128,
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rdlc ean 128,
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rdlc ean 128,
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rdlc ean 128,
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rdlc ean 128,
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2.3 Keeping your EJB deployment descriptor current 2.15 Adding the destination type to a message-driven bean deployment descriptor 6, Messaging

As you can see in listing 2.2, EJB from the client side looks even simpler than developing the component code. Other than the @EJB annotation on the placeBid private variable, the code is no different than using a local POJO.

When the servlet container sees the @EJB annotation as the servlet is first loaded, it looks up the PlaceBid EJB behind the scenes and sets the placeBid variable to the retrieved EJB reference. If necessary, the container will look up the EJB remotely over RMI.

The Singleton design pattern can be described as follows: The problem and its context: Certain classes should only have a single instance during the execution of a program. This can be necessary for two reasons: either the class models a unique object, such as a set of global variables for the application, and having

art 2 encompasses the majority of this book. Here you will find chapters covering the major functional areas of Enterprise JavaBeans ( EJB ). These areas include working with data, transactions, security, messaging, and other important EJB activities. 3, Working with data, covers many of the problems encountered when EJBs interact with databases. The recipes presented in this chapter do more than just cover entity beans. 4, EJB activities, covers topics encountered by developers across a wide range of EJB topics. These recipes do not fall into the area of security, data, or transactions. In this chapter, you will find topics ranging from sending email to making EJB web service endpoints. 5, Transactions, solves many of the problems you ll encounter when developing with transactions. In this chapter we explain and demonstrate solutions for both bean-managed and container-managed EJBs. 6, Messaging, presents topics that deal with EJBs and the Java Message Service (JMS). Specifically, this chapter thoroughly covers message-driven EJB problems. In addition to learning about the message-driven bean, you will find topics that demonstrate solutions to JMS-specific problems. 7, Security, provides solutions to security-related problems; the solutions focus on good design and the EJB API. Many of the recipes use the declarative security model provided by the EJB container.

The @EJB annotation works in any component that is registered with the Java EE container, such as a servlet or JavaServer Faces (JSF) backing bean. As long as you are using the standard Java EE stack, this is probably more than sufficient. There are a couple other interesting items in this code that illustrate concepts we introduced earlier. Let s take a closer look. EJB 3 dependency injection Although we mentioned DI in the beginning of the chapter, if you are not familiar with it you may think that what the @EJB annotation is doing is a little unusual in a nifty, black-magic kind of way. In fact, if we didn t tell you anything about the code, you might have been wondering if the placeBid private variable is even usable in the servlet s service method since it is never set! If fact, if the container didn t intervene we d get the infamous java.lang.NullPointerException when we tried to call the addBid method in listing 2.2 since the placeBid variable would still be null. One interesting way to understand DI is to think of it as custom Java variable instantiation. The @EJB annotation in listing 2.2 makes the container