By Dave Minter

Spring has made a outstanding upward push on account that its belief in 2002. clients locate Spring the appropriate framework to construct their purposes in J2EE environments. Beginning Spring 2 is the 1st Spring–authorized publication that takes you thru the 1st steps of utilizing Spring, and calls for no past J2EE event. It discusses correct built-in applied sciences that you can concentrate on, and illustrates how Spring makes utilizing them easier.

The e-book teaches the right kind utilization of Spring in purposes, and lowers the training curve on J2EE criteria. It covers valuable good points of Spring with out delving too some distance into complex beneficial properties. The authors reap the benefits of much less complicated choices each time attainable, and exhibits how Spring could make you extra efficient in complex environments the place J2EE applied sciences have to be utilized. The publication covers the total Spring net instruments portfolio and bargains with patience and transaction administration. It additionally introduces 3–tier program layout and the way to check those designs.

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Extra resources for Beginning Spring 2: From Novice to Professional

Example text

Constructor Autowiring is carried out by using beans of the same types as the constructor’s parameters. autodetect Equivalent to byType if the target bean has a default constructor, or to constructor otherwise. byType is used when a constructor exists because constructor parameter names are not retained at runtime and therefore cannot be determined by reflection. The problem with autowiring is that it makes the relationship between the beans and their dependencies completely implicit. This can make diagnosing configuration problems quite difficult (it is relatively easy to assign the wrong dependency without having any conspicuous entry in the configuration files to indicate this), and autowiring can seem a little too much like “magical” behavior to novice Spring developers.

Boolean isTypeMatch(String name, Class targetType) Determines whether the named bean matches the provided type—essentially determines whether a call to getBean(String,Class) would be successful. The implementation of the factory (how it actually goes about acquiring the instances and configuring their dependencies) is not really our problem. As long as we can acquire a bean factory that materializes suitable beans, we need inquire no further. The limited set of methods available should help to illustrate the fact that a BeanFactory really is a container; the methods provided to you are exclusively about querying the factory about its contents and obtaining items from it.

If the configuration is unambiguous (if the parameters are all of incompatible types, or if there is only one parameter), you can just list the appropriate constructor-arg elements. However, if there is an ambiguity in the types of parameters to the constructor—as in Listing 3-18, where the constructor takes two string parameters—you must provide an index attribute to each of the constructor arguments to identify. The order of the constructor-arg elements in the configuration file does not matter; only the index attribute is pertinent here.

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