资源注释：没有定义类型为[javax.sql.DataSource]的符合条件的bean：预期的单个匹配bean但是找到2

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问题描述

我正在使用基于Spring Java的配置来使用Spring Data配置多个数据库。
在配置文件中，我为 MySQL 和创建两个数据源 MSSQL-服务器。当尝试使用 @Resource 注释向实体管理员注入依赖项时，我得到以下异常：

  org.springframework.beans.factory.NoUniqueBeanDefinitionException：没有定义类型为[javax.sql.DataSource]的符合条件的bean：预期的单一匹配bean，但发现2：mysql_datasource，secure_datasource 
在org.springframework .beans.factory.support.DefaultListableBeanFactory.doResolveDependency（DefaultListableBeanFactory.java:1016）
在org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency（DefaultListableBeanFactory.java:904）
在org.springframework .beans.factory.support.ConstructorResolver.resolveAutowiredArgument（ConstructorResolver.java:815）
在org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray（ConstructorResolver.java:743）

以下是我的代码：

  @Bean（name =secure_datasource）
 pub lic DataSource dataSource（）{
 try {
 ComboPooledDataSource dataSource = new ComboPooledDataSource（）; 
 dataSource.setJdbcUrl（environment.getProperty（sc.db.url））; 
 dataSource.setDriverClass（environment.getProperty（sc.db.driver.class））; 
 dataSource.setUser（environment.getProperty（sc.db.username））; 
 dataSource.setPassword（environment.getProperty（sc.db.password））; 
 dataSource.setIdleConnectionTestPeriod（60）; 
 dataSource.setMaxPoolSize（10）; 
 dataSource.setMaxStatements（7）; 
 dataSource.setMinPoolSize（1）; 
 return dataSource; 
} catch（Exception ex）{
 throw new RuntimeException（ex）; 
} 
} 
 
 ................. 
 
 @Bean（name =mysql_datasource ）
 public DataSource dataSource（）{
 try {
 ComboPooledDataSource dataSource = new ComboPooledDataSource（）; 
 dataSource.setJdbcUrl（environment.getProperty（db.url））; 
 dataSource.setDriverClass（environment.getProperty（db.driver.class））; 
 dataSource.setUser（environment.getProperty（db.username））; 
 dataSource.setPassword（environment.getProperty（db.password））; 
 dataSource.setIdleConnectionTestPeriod（60）; 
 dataSource.setMaxPoolSize（100）; 
 dataSource.setMaxStatements（50）; 
 dataSource.setMinPoolSize（10）; 
 return dataSource; 
} catch（Exception ex）{
 throw new RuntimeException（ex）; 
} 
} 
 
 ....... 
 
 @Resource（value =mysql_datasource）
 @Bean（name =entity_manager_factory）
 public LocalContainerEntityManagerFactoryBean entityManagerFactory（DataSource dataSource）{
 LocalContainerEntityManagerFactoryBean factoryBean = new LocalContainerEntityManagerFactoryBean（）; 
 factoryBean.setDataSource（dataSource）; 
 factoryBean.setPersistenceProviderClass（HibernatePersistenceProvider.class）; 
 factoryBean.setPackagesToScan（environment.getProperty（package.scan））; 
 factoryBean.setJpaVendorAdapter（jpaVendorAdapter）; 
 return factoryBean; 
}

我也试图使用 @Qualifier 注释建议我这个链接，但仍然得到错误。

解决方案

我有同样的问题，很多头痛后，我偶然发现这个使我感到非常愚蠢：（

 
 
 所有您需要的是您的一个DataSources上的@Primary，而Spring-Boot将不再困惑...这是我的一个配置...休息是非常相同的，指向其他数据库，没有@Primary他们... 
  @Configuration 
 @EnableTransactionManagement 
 @EntityScan（basePackages = {somepackage.entities}）
 @EnableJpaRepositories（entityManagerFactoryRef =emfDB1，transactionManagerRef =tmDB1，basePackages = {somepackage.repositories}）
类Persistenc eDB1 {
 @Bean 
 @Primary 
 DataSource dsDB1（）{
 BasicDataSource dataSource = new BasicDataSource（）; 
 dataSource.setUrl（jdbc：mysql：// someserver：3306 / proativo）; 
 dataSource.setUsername（username）; 
 dataSource.setPassword（password）; 
 dataSource.setDriverClassName（com.mysql.jdbc.Driver）; 
 return dataSource; 
} 
 
 @Bean 
 @Primary 
 LocalContainerEntityManagerFactoryBean emfDB1（）{
 LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean（）; 
 entityManagerFactoryBean.setDataSource（dsDB1（））; 
 entityManagerFactoryBean.setJpaVendorAdapter（new EclipseLinkJpaVendorAdapter（））; 
 
 entityManagerFactoryBean.setPersistenceXmlLocation（classpath：META-INF / DB1-persistence.xml）; 
 
属性jpaProperties = new Properties（）; 
 jpaProperties.put（eclipselink.weaving，false）; 
 jpaProperties.put（eclipselink.logging.level，SEVERE）; // SEVERE / FINEST 
 
 entityManagerFactoryBean.setJpaProperties（jpaProperties）; 
 return entityManagerFactoryBean; 
} 
 
 @Bean 
 @Primary 
 JpaTransactionManager tmDB1（）{
 JpaTransactionManager transactionManager = new JpaTransactionManager（）; 
 transactionManager.setEntityManagerFactory（emfDB1（）。getNativeEntityManagerFactory（））; 
 return transactionManager; 
} 
} 
  
编辑：
忘了提了：可能由于我的配置类完成的方式，在@EnableAutoConfiguration上排除一些类的方法对我来说不起作用。
 
I am using Spring Java Based configuration for configure multiple database with Spring Data.In the configuration file, i am creating two data source for MySQL and MSSQL-Server. When trying to inject dependency to the entity manager using @Resource annotation i am getting following exception: 
org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [javax.sql.DataSource] is defined: expected single matching bean but found 2: mysql_datasource,secure_datasource
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1016)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:904)
at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:815)
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:743)
Following is my Code: 
@Bean(name="secure_datasource")
public DataSource dataSource(){
    try{
        ComboPooledDataSource dataSource = new ComboPooledDataSource();
        dataSource.setJdbcUrl(environment.getProperty("sc.db.url"));
        dataSource.setDriverClass(environment.getProperty("sc.db.driver.class"));
        dataSource.setUser(environment.getProperty("sc.db.username"));
        dataSource.setPassword(environment.getProperty("sc.db.password"));
        dataSource.setIdleConnectionTestPeriod(60);
        dataSource.setMaxPoolSize(10);
        dataSource.setMaxStatements(7);
        dataSource.setMinPoolSize(1);
        return dataSource;
    }catch(Exception ex){
        throw new RuntimeException(ex);
    }
}

.................

@Bean(name="mysql_datasource")
public DataSource dataSource(){
    try{
        ComboPooledDataSource dataSource = new ComboPooledDataSource();
        dataSource.setJdbcUrl(environment.getProperty("db.url"));
        dataSource.setDriverClass(environment.getProperty("db.driver.class"));
        dataSource.setUser(environment.getProperty("db.username"));
        dataSource.setPassword(environment.getProperty("db.password"));
        dataSource.setIdleConnectionTestPeriod(60);
        dataSource.setMaxPoolSize(100);
        dataSource.setMaxStatements(50);
        dataSource.setMinPoolSize(10);
        return dataSource;
    }catch(Exception ex){
        throw new RuntimeException(ex);
    }
}

.......

@Resource(value="mysql_datasource")
@Bean(name="entity_manager_factory")
public LocalContainerEntityManagerFactoryBean entityManagerFactory(DataSource dataSource){
    LocalContainerEntityManagerFactoryBean factoryBean = new LocalContainerEntityManagerFactoryBean();
    factoryBean.setDataSource(dataSource);
    factoryBean.setPersistenceProviderClass(HibernatePersistenceProvider.class);
    factoryBean.setPackagesToScan(environment.getProperty("package.scan"));
    factoryBean.setJpaVendorAdapter(jpaVendorAdapter);
    return factoryBean;
}
I am also trying to use @Qualifier annotation as suggest i this link, but still getting error. Using 2 beans of the same type: javax.sql.DataSource in Spring
 解决方案 
I had the same problem and after a lot of headache I stumbled upon this doc that made me feel really dumb :(
All you need is @Primary on one of your DataSources and Spring-Boot won't get confused anymore... Here is one of my configurations... The rest are pretty much identical, pointing to other DBs and with no @Primary on them...
@Configuration
@EnableTransactionManagement
@EntityScan(basePackages = {"somepackage.entities"})
@EnableJpaRepositories(entityManagerFactoryRef = "emfDB1", transactionManagerRef = "tmDB1", basePackages = {"somepackage.repositories"})
class PersistenceDB1 {
    @Bean
    @Primary
    DataSource dsDB1() {
        BasicDataSource dataSource = new BasicDataSource();
        dataSource.setUrl("jdbc:mysql://someserver:3306/proativo");
        dataSource.setUsername("username");
        dataSource.setPassword("password");
        dataSource.setDriverClassName("com.mysql.jdbc.Driver");
        return dataSource;
    }

    @Bean
    @Primary
    LocalContainerEntityManagerFactoryBean emfDB1() {
        LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean();
        entityManagerFactoryBean.setDataSource(dsDB1());
        entityManagerFactoryBean.setJpaVendorAdapter(new EclipseLinkJpaVendorAdapter());

        entityManagerFactoryBean.setPersistenceXmlLocation("classpath:META-INF/DB1-persistence.xml");

        Properties jpaProperties = new Properties();
        jpaProperties.put("eclipselink.weaving", "false");
        jpaProperties.put("eclipselink.logging.level", "SEVERE"); // SEVERE / FINEST

        entityManagerFactoryBean.setJpaProperties(jpaProperties);
        return entityManagerFactoryBean;
    }

    @Bean
    @Primary
    JpaTransactionManager tmDB1() {
        JpaTransactionManager transactionManager = new JpaTransactionManager();
        transactionManager.setEntityManagerFactory(emfDB1().getNativeEntityManagerFactory());
        return transactionManager;
    }
}
Edit:Forgot to mention: Probably due to the way my configuration classes are done, the method of excluding some classes on @EnableAutoConfiguration didn't work for me...
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