Spring-Boot忽略@Qualifier注释

Question

我正在将一个活跃的Spring Web应用程序迁移到spring boot(1.4.2).

bean在使用@ImportResource加载时在XML中定义.

我开始的4个bean是同一个对象BasicDataSource的一个实例.

要告诉spring哪个加载我已经为每个设置了一个ID并使用@Qualifier将正确的bean绑定到变量.

但似乎Spring忽略了我的@Qualifier并抛出"没有类型'javax.sql.DataSource'的限定bean可用:预期单个匹配bean但找到4:DataSource1,DataSource2,DataSource3,DataSource4"

PS - 请注意,具有@Qualifier的类是抽象类,而未能实例化的类是扩展类,但@Qualifier具有@Inherited.

XML

<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"
xmlns:jee="http://www.springframework.org/schema/jee" xmlns:task="http://www.springframework.org/schema/task"
xmlns:cache="http://www.springframework.org/schema/cache"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="
   http://www.springframework.org/schema/beans 
   http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
   http://www.springframework.org/schema/aop 
   http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
   http://www.springframework.org/schema/context 
   http://www.springframework.org/schema/context/spring-context-3.2.xsd
   http://www.springframework.org/schema/jee 
   http://www.springframework.org/schema/jee/spring-jee-3.2.xsd
   http://www.springframework.org/schema/task 
   http://www.springframework.org/schema/task/spring-task-3.2.xsd
   http://www.springframework.org/schema/cache
   http://www.springframework.org/schema/cache/spring-cache-3.2.xsd
   http://ehcache-spring-annotations.googlecode.com/svn/schema/ehcache-spring
   http://ehcache-spring-annotations.googlecode.com/svn/schema/ehcache-spring/ehcache-spring-1.1.xsd">

<context:load-time-weaver aspectj-weaving="on"/>
<cache:annotation-driven mode="aspectj"/>
<context:property-override location="file:/app/config/dataSourceOverride.cfg"/>
<context:annotation-config />

<bean id="DataSource1" class="org.apache.commons.dbcp.BasicDataSource"
    destroy-method="close">
    <property name="userId" value="4" />
</bean>

<bean id="DataSource2" class="org.apache.commons.dbcp.BasicDataSource"
    destroy-method="close">
    <property name="userId" value="3" />
</bean>

<bean id="DataSource3" class="org.apache.commons.dbcp.BasicDataSource"
    destroy-method="close">
    <property name="userId" value="2" />
</bean>

<bean id="DataSource4" class="org.apache.commons.dbcp.BasicDataSource"
    destroy-method="close">
    <property name="userId" value="1" />
</bean>

Spring启动应用程序主要

package com.app;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.ImportResource;


@SpringBootApplication
@EnableAutoConfiguration
@ComponentScan("com.app")
@ImportResource("com/app/startup/spring.xml")
public class SpringBootServer {

    public static void main(String[] args) {
        SpringApplication.run(SpringBootServer.class, args);

    }
}

抽象类

public abstract class GenericDao {

    public GenericDao() {

    }

    private Logger logger = LoggerFactory.getLogger(GenericDao.class);

    @Autowired
    @Qualifier("DataSource1")
    protected BasicDataSource dataSource1Impl;

    @Autowired
    @Qualifier("DataSource2")
    protected BasicDataSource dataSource2Impl;

    @Autowired
    @Qualifier("DataSource3")
    protected BasicDataSource dataSource3Impl;

    @Autowired
    @Qualifier("DataSource4")
    protected BasicDataSource dataSource4Impl;
}

坚实的Calss

@Component("widgetsDao")
public class WidgetsDao extends GenericDao {

##Some methods##

}

例外

***************************
APPLICATION FAILED TO START
***************************

Description:

Field dataSource1Impl in com.app.dal.GenericDao required a single bean, but 4 were found:
    - DataSource1: defined in class path resource [com/app/startup/app-spring.xml]
    - DataSource2: defined in class path resource [com/app/startup/app-spring.xml]
    - DataSource3: defined in class path resource [com/app/startup/app-spring.xml]
    - DataSource4: defined in class path resource [com/app/startup/app-spring.xml]


Action:

Consider marking one of the beans as @Primary, updating the consumer to accept multiple beans, or using @Qualifier to identify the bean that should be consumed

有什么可能让spring忽略我的@Qualifier注释？

谢谢你.

Answer 1

在使用多个数据源时，我看到了同样的错误，在将其中一个数据源 bean 设置为“主要”之后，问题似乎得到了解决，然后我能够使用 @Qualifier 注释自动装配正确的 bean。

这里的Spring Boot文档同意这一点，说当使用多个数据源时，其中一个数据源bean必须是主要的。

我使用 @Bean 注释在 Java 中配置了我的 bean，因此我使用 @Primary 注释来创建一个主要的。但是，如果您在 XML 中进行配置，则看起来 XML 中的元素确实具有一个可选的“主要”属性，如果在 XML 中配置 bean，则可以使用该属性。