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Auto-Wiring by Constructor The auto-wiring mode constructor works like byType, but it s rather more complicated. For a bean with a single constructor, Spring will attempt to wire a bean with a compatible type for each constructor argument. But for a bean with multiple constructors, the process is more complicated. Spring will first attempt to find a bean with a compatible type for each argument of each constructor. Then it will pick the constructor with the most matching arguments. Suppose that SequenceGenerator has one default constructor and one constructor with an argument PrefixGenerator. package com.apress.springrecipes.sequence; public class SequenceGenerator { public SequenceGenerator() {} public SequenceGenerator(PrefixGenerator prefixGenerator) { this.prefixGenerator = prefixGenerator; } ... } In this case, the second constructor will be matched and picked because Spring can find a bean whose type is compatible with PrefixGenerator. <beans ...> <bean id="sequenceGenerator" class="com.apress.springrecipes.sequence.SequenceGenerator" autowire="constructor"> <property name="initial" value="100000" /> <property name="suffix" value="A" /> </bean> <bean id="datePrefixGenerator" class="com.apress.springrecipes.sequence.DatePrefixGenerator"> <property name="pattern" value="yyyyMMdd" /> </bean> </beans> However, multiple constructors in a class may cause ambiguity in constructor argument matching. The situation may be further complicated if you ask Spring to determine a constructor for you. So, if you use this auto-wiring mode, take great care to avoid ambiguity. Auto-Wiring by Auto-Detection The auto-wiring mode autodetect asks Spring to decide the auto-wiring mode between byType and constructor. If a default constructor with no argument is found for that bean, byType will be chosen. Otherwise, constructor will be chosen. As the SequenceGenerator class has a default constructor defined, byType will be chosen. That means the prefix generator will be injected via the setter method.

Similarly, Spring provides JpaTemplate to simplify your DAO implementation by managing entity managers and transactions for you. However, using Spring s JpaTemplate means your DAO is dependent on Spring s API.

<beans ...> <bean id="sequenceGenerator" class="com.apress.springrecipes.sequence.SequenceGenerator" autowire="autodetect"> <property name="initial" value="100000" /> <property name="suffix" value="A" /> </bean> <bean id="datePrefixGenerator" class="com.apress.springrecipes.sequence.DatePrefixGenerator"> <property name="pattern" value="yyyyMMdd" /> </bean> </beans>

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Auto-Wiring and Dependency Checking As you have seen, if Spring finds more than one candidate bean for auto-wiring, it will throw an UnsatisfiedDependencyException. On the other hand, if the auto-wiring mode is set to byName or byType, and Spring cannot find a matching bean to wire, it will leave the property unset, which may cause a NullPointerException or a value that has not been initialized. However, if you would like to be notified when auto-wiring cannot wire your beans, you should set the dependency-check attribute to objects or all. In that case, an UnsatisfiedDependencyException will be thrown whenever auto-wiring doesn t work. <bean id="sequenceGenerator" class="com.apress.springrecipes.sequence.SequenceGenerator" autowire="byName" dependency-check="objects"> <property name="initial" value="100000" /> <property name="suffix" value="A" /> </bean>

An alternative to Spring s JpaTemplate is to use JPA s context injection. Originally, the @PersistenceContext annotation is used for entity manager injection in EJB components. Spring can also interpret this annotation by means of a bean post processor. It will inject an entity manager into a property with this annotation. Spring ensures that all your persistence operations within a single transaction will be handled by the same entity manager.

The solution is to maintain continuity in the project team Instead of continually interrupting the project to bring new team members on board, it s better to let the team acquire the knowledge it needs from day one Let them gain familiarity with the scope of the project by gathering and analyzing the requirements themselves Let the developers take a hand in designing the solution, so that they can better understand how the architecture fulfills its goals Because software construction is actually a process of refining a design (characteristic #10), the more the developers understand the design, the more consistency and quality there will be in the code they write Developers don t just write code They also do design work and perform testing If you need to bring in an expert designer or tester, then bring them in to advise, guide, and train the team in their specialty.

Auto-wiring by setting the autowire attribute in the bean configuration file will wire all properties of a bean. It s not flexible enough to wire particular properties only. Moreover, you can only auto-wire beans either by type or by name. If neither strategy satisfies your requirements, you must wire your beans explicitly.

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