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public ConstructorTestBean(String name, Integer id) { this.constructor1Used = true; } public ConstructorTestBean(String firstName, String lastName) { this.constructor2Used = true; } public boolean isConstructor1Used() { return this.constructor1Used; } public boolean isConstructor2Used() { return this.constructor2Used; } } When you configure the ConstructorTestBean class with two constructor arguments, the container will use the best match, meaning the constructor that is the closest match to the constructor argument types you provide. The configuration shown in Listing 2-12 has two constructor arguments that are both considered Strings. Why In XML, all literal values are Strings, and the container does not convert constructor argument values for finding a constructor. Listing 2-12. Configuring the ConstructorTestBean Class with Two Constructor Arguments < xml version="1.0" encoding="UTF-8" > <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"> <beans> <bean id="testBean" class="com.apress.springbook.chapter02.ConstructorTestBean"> <constructor-arg value="Steven Devijver"/> <constructor-arg value="1"/> </bean> </beans> We want to use the first constructor of the ConstructorTestBean class, and we can write a test case to verify it has actually been called, as shown in Listing 2-13. Listing 2-13. A Test Case to Verify the First Constructor Is Used package com.apress.springbook.chapter02; import junit.framework.TestCase; import org.springframework.core.io.ClassPathResource; import org.springframework.beans.factory.BeanFactory; import org.springframework.beans.factory.xml.XmlBeanFactory; public class ConstructorTestBeanIntegrationTests extends TestCase { private static BeanFactory beanFactory = new XmlBeanFactory( new ClassPathResource( "com/apress/springbook/chapter02/test-bean-tests.xml"
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) ); private static ConstructorTestBean testBean; static { testBean = (ConstructorTestBean)beanFactory.getBean("testBean"); } public void testIsConstructor1Used() { assertTrue(testBean.isConstructor1Used()); } public void testIsConstructor2NotUsed() { assertFalse(testBean.isConstructor2Used()); } }
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The Using an ApplicationContext in Integration Tests section explains how to load configuration files in test cases more conveniently.
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Unfortunately, when we run the test case in Listing 2-13, it appears that the container has used the second constructor of the ConstructorTestBean class. The container has picked the most specific constructor the one with two String arguments. We can force the container to use another constructor by providing the type of the constructor arguments. In this case, it is sufficient to change the configuration and specify that the second constructor argument is of type java.lang.Integer, as shown in Listing 2-14. Listing 2-14. Forcing the Container to Use the First Constructor < xml version="1.0" encoding="UTF-8" > <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"> <beans> <bean id="testBean" class="com.apress.springbook.chapter02.ConstructorTestBean"> <constructor-arg value="Steven Devijver"/> <constructor-arg value="1" type="java.lang.Integer"/> </bean> </beans> Adding the type information to the second constructor argument makes the ConstructorTestBeanIntegrationTests test case run successfully and forces the container to use a specific constructor.
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You should write your own test cases whenever you want to see how a specific feature of the Spring Framework works. The same goes for any other frameworks, including the classes of the Java Development Kit (JDK).
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Setter and Constructor Injection Combination
The container allows the combination of setter injection and constructor injection in the same bean definition, which is especially useful for configuring existing classes in the container. Another use case for combining both forms of dependency injection is to pass required parameters via the constructor and optional parameters via properties. Let s refactor the Player class to reflect that the full name parameter is required and the ranking parameter is optional, as shown in Listing 2-15. Listing 2-15. Refactored Player Class with Required and Optional Parameters package com.apress.springbook.chapter02; public class Player { private String fullName; private int ranking; public Player(String fullName) { if (fullName == null || fullName.length() == 0) { throw new IllegalArgumentException("Full name is required!"); } this.fullName = fullName; } public String getFullName() { return this.fullName; } public void setRanking(int ranking) { this.ranking = ranking; } public int getRanking() { return this.ranking; } } We can now combine setter injection and constructor injection in the configuration file to configure the Player class, as shown in Listing 2-16. Listing 2-16. Combining Setter Injection and Constructor Injection in the Same Bean Definition < xml version="1.0" encoding="UTF-8" > <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"> <beans> <bean id="Kim" class="com.apress.springbook.chapter02.Player"> <constructor-arg value="Kim Clijsters"/> <property name="ranking" value="1"/> </bean> <bean id="Justine" class="com.apress.springbook.chapter02.Player"> <constructor-arg ref="Henin-Hardenne"/> <property name="ranking" value="5"/> </bean>
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