Spring批处理@主注释重写错误bean

Question

我按照本教程在Java中配置Spring批处理作业。它通过使用一个接口为多个数据源做准备，然后由每个数据源实现该接口。

这是我目前所掌握的：

public interface InfrastructureConfiguration {
    @Bean
    DataSource dataSource();
}

@Configuration
@Primary
public class MySQLConfiguration implements InfrastructureConfiguration {

    @Bean
    public DataSource dataSource() {
        final DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName("com.mysql.jdbc.Driver");
        dataSource.setUrl("jdbc:mysql://localhost:3306/employees?useSSL=false");
        dataSource.setUsername("testing");
        dataSource.setPassword("testing");
        return dataSource;
    }
}

PostgreSQLConfig.java

@Configuration
public class PostgreSQLConfiguration implements InfrastructureConfiguration {

    @Bean
    public DataSource dataSource() {
        final DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName("org.postgresql.Driver");
        dataSource.setUrl("jdbc:postgresql://localhost:5432/postgres");
        dataSource.setUsername("postgres");
        dataSource.setPassword("testing");
        return dataSource;
    }
}

jobconfig.java

@Configuration
public class JobConfig {

    @Autowired
    private InfrastructureConfig infrastructureConfig

    ....
}

通过对我的MySQLConfig使用@primary注释，我希望使用MySQLConfig bean。相反，我得到的是：

2017-03-09 12:46:21.422  INFO 1496 --- [           main] o.s.b.f.s.DefaultListableBeanFactory     : Overriding bean definition for bean 'dataSource' with a different definition: replacing [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=mySQLConfiguration; factoryMethodName=dataSource; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [config/MySQLConfiguration.class]] with [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=postgreSQLConfiguration; factoryMethodName=dataSource; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [config/PostgreSQLConfiguration.class]]

Answer 1

将@primary放在方法上(@bean旁边），而不是放在类级别上。