我正在将一款活跃的Spring Web应用程序迁移到Spring Boot(1.4.2)。
这些bean是通过@ImportResource加载的XML定义的。
我启动的4个bean都是同一个对象BasicDataSource的实例。
为了告诉Spring要加载哪一个,我为每个对象设置了ID,并使用@Qualifier将正确的bean绑定到变量上。
但似乎Spring忽略了我的@Qualifier,抛出"没有找到类型为'javax.sql.DataSource'的合格bean:预期找到单个匹配的bean,但找到了4个:DataSource1、DataSource2、DataSource3、DataSource4"
P.S - 请注意,具有@Qualifier的类是抽象类,而无法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 Boot应用主类
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;
}
实体类
@Component("widgetsDao")
public class WidgetsDao extends GenericDao {
##Some methods##
}
异常
***************************
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
可能是什么原因导致Spring忽略了我的@Qualifier注解?谢谢。
@Autowired BasicDataSource datasource4
将会与名为datasource4
的 bean 进行自动装配。 - slim