Why NoUniqueBeanDefinitionException: No qualifying bean of type is defined: expected single matching bean but found 2

3
votes

In this small app, I have used @Autowired annotation along with @Qualifier annotation to config the dependencies, but still an exception is thrown as mentioned below.

Pizaa class

public class Pizza {

    private Address deliverydest;

    @Autowired
    @Qualifier("ForPizza")
    public void setDeliverydest(Address deliverydest) {
        this.deliverydest = deliverydest;
    }
}

Spring Context Configuration

<?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>

The exception thrown is

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

.

Now why is the Spring not considering the @Qualifier annotation to find the correct bean dest1 having qualifier value="ForPizza" ?

3
javaspringbeancreationexception
Because the AutowiredAnnotationBeanPostProcessor doesn't know about the @Qualifier annotation. Use <context:annotation-config /> ro if you really want to explicitly configure the parsers add a CustomAutowireConfigurer to enable detection of @Qualifier. – M. Deinum
@Deinum, its strange bcoz i was following a tutorial in this link, and it worked there. – aj_blk

3 Answers

3
votes

Try adding the following to your Spring Configuration:

<context:annotation-config/>
<context:component-scan base-package="com.test.Shopping"/>
1
votes

Try to place @Qualifier on parameter rather than on method:

@Autowired
public void setDeliverydest(@Qualifier("ForPizza") Address deliverydest) { ... }
1
votes

Remove all annotation bean post processors and just add the below in xml.

<context:annotation-config/>