在这个小应用程序中，我使用了 @Autowired 注释和 @Qualifier 注释来配置依赖项，但仍然会抛出异常，如下所述。
比萨类
public class Pizza {
private Address deliverydest;
@Autowired
@Qualifier("ForPizza")
public void setDeliverydest(Address deliverydest) {
this.deliverydest = deliverydest;
}
}
Spring 上下文配置
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">
<bean id="pizza" class="com.test.Shopping.Pizza" />
<bean id="Cust1Address" class="com.test.Shopping.Address" />
<bean id="dest1" class="com.test.Shopping.Address" >
<qualifier value="ForPizza" />
<property name="buildingno" value="flat1/door2" />
</bean>
<bean class="org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor" />
</beans>
抛出的异常是
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'pizza': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire method: public void com.test.Shopping.Pizza.setDeliverydest(com.test.Shopping.Address); nested exception is org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [com.test.Shopping.Address] is defined: expected single matching bean but found 2: Cust1Address,dest1
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire method: public void com.test.Shopping.Pizza.setDeliverydest(com.test.Shopping.Address); nested exception is org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [com.test.Shopping.Address] is defined: expected single matching bean but found 2: Cust1Address,dest1
Caused by: org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [com.test.Shopping.Address] is defined: expected single matching bean but found 2: Cust1Address,dest1
.
现在为什么 Spring 不考虑使用 @Qualifier 注释来找到具有限定符 value="ForPizza" 的正确 bean dest1？
最佳答案
尝试将以下内容添加到您的 Spring 配置中:
<context:annotation-config/>
<context:component-scan base-package="com.test.Shopping"/>
关于java - 为什么 NoUniqueBeanDefinitionException : No qualifying bean of type is defined: expected single matching bean but found 2，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/24430346/