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In this chapter, you have learned the basic bean configuration in the Spring IoC container Spring supports several types of bean configuration Among them, XML is simplest and most mature Spring provides two types of IoC container implementation The basic one is the bean factory, while the advanced one is the application context If possible, you should use the application context unless resources are restricted Spring supports both setter injection and constructor injection for defining bean properties, which can be simple values, collections, or bean references Dependency checking and auto-wiring are two valuable container features provided by Spring Dependency checking helps to check if all required properties are set, while autowiring can wire your beans automatically either by type, name, or annotation The old style of configuring these two features is by XML attributes, while the new style is by annotations and bean post processors, which allow greater flexibility.

Stateless session bean Stateful session bean General message-driven bean that may not use JMS Message-driven bean that uses JMS

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Spring provides support for bean inheritance by extracting the common bean configurations to form a parent bean The parent bean can act as a configuration template, a bean instance, or both at the same time As collections are essential programming elements of Java, Spring provides various collection tags for you to configure collections in the bean configuration file easily You can use the collection factory beans or the collection tags in the utility schema to specify more details for a collection, and also define collections as stand-alone beans to share between multiple beans Finally, Spring can auto-detect your components from the classpath By default, it can detect all components with particular stereotype annotations But you can further include or exclude your components with filters Component scanning is a powerful feature that can reduce the amount of configurations.

Other publishers do the same, but don t even mention that the software is beta We can t take it for granted that a given software tool or component will work as we expect it to, or do everything that we need when we use it to create our software Even if the product chosen is mature and well regarded, and even if the developers have used it before, because of the complexity of software, you can rarely be sure that it can be used for the functions and circumstances that are unique to a particular project You can t tell if it will do the job until you ve actually made it do the job, and have seen that it works So software development is also a process of discovering whether and how the chosen technology can be made to perform the role that s required of it.

In the next chapter, you will learn the advanced Spring IoC container features that have not been introduced in this chapter..

Moreover, the EJB support classes provide access to the Spring IoC container for you to implement your business logic in POJOs and wrap them with EJB components. Because POJOs are easier to develop and test, implementing business logic in POJOs can accelerate your EJB development. For more on messaging, please see 7.

n this chapter, you will learn the advanced features and internal mechanisms of the Spring IoC container, which can help you to increase your efficiency when developing Spring applications. Although these features may not be used frequently, they are indispensable to a comprehensive and powerful container. They are also the foundation of other modules of the Spring framework. The Spring IoC container itself is designed to be easily customizable and extensible. It allows you to customize the default container behaviors through configuration, and also extend the container s features by registering your container plug-ins that conform to the container specification. Upon finishing this chapter, you will be very familiar with most features of the Spring IoC container. This will give you a useful basis for learning about different topics of Spring in the subsequent chapters.

Suppose you are going to develop a system for a post office. You are asked to develop a stateless session bean for calculating postage based on the destination country and the weight. The target runtime environment is an application server that supports EJB 2.x only, so you have to develop the EJB component that will work with this version. Compared with lightweight POJOs, EJB 2.x components are more difficult to build, deploy, and test. A good practice for developing EJB 2.x components is to implement business logic in POJOs and then wrap them with EJB components. First, you define the following business interface for postage calculation: package com.apress.springenterpriserecipes.post; public interface PostageService { public double calculatePostage(String country, double weight); } Then you have to implement this interface. Typically, it should query the database for the postage and perform some calculation. Here, you may hard-code the result for testing purposes. package com.apress.springenterpriserecipes.post; public class PostageServiceImpl implements PostageService { public double calculatePostage(String country, double weight) { return 1.0; } }

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