我正在尝试使用基于 Javaconfig 的 Spring 配置。我有两个相同类型的 bean，并尝试通过限定符自动装配它们。但它似乎不起作用。
这是我的配置类
@Configuration
@EnableAutoConfiguration
@ComponentScan("com.test")
public class BasicConfig {
@Bean(name = "mysqlSource")
@Qualifier("mysqlSource")
public DataSource jdbcTemplateMySql() {
BasicDataSource dataSource = new BasicDataSource();
dataSource.setDriverClassName("com.mysql.jdbc.Driver");
dataSource.setUrl("jdbc:mysql://localhost:3306/db1?useUnicode=true&characterEncoding;=UTF-8");
dataSource.setUsername(mysqlUser);
dataSource.setPassword(mysqlPass);
return dataSource;
}
@Bean(name = "oracleSource")
@Qualifier("oracleSource")
public DataSource jdbcSourceOracle() {
BasicDataSource dataSource = new BasicDataSource();
dataSource.setDriverClassName("oracle.jdbc.driver.OracleDriver");
dataSource.setUrl("jdbc:oracle:thin:@lab-scan.tigeritbd.com:1521/evidb.tigeritbd.com");
dataSource.setUsername(oracleUser);
dataSource.setPassword(oraclePass);
return dataSource;
}
}
这两个是我尝试使用自动装配的其他课程。
@Repository
public class TrackingInfiniDBRepo implements DataPutRepo {
private NamedParameterJdbcTemplate jdbcTemplate;
@Autowired
void setJdbcTemplateOracle(@Qualifier("mysqlSource") DataSource dataSource) {
jdbcTemplate = new NamedParameterJdbcTemplate(dataSource);
}
}
@Repository
public class OracleDataFetcherRepo implements DataFetcherRepo {
private NamedParameterJdbcTemplate jdbcTemplateOracle;
@Autowired
void setJdbcTemplateOracle(@Qualifier("oracleSource") DataSource dataSource) {
jdbcTemplateOracle = new NamedParameterJdbcTemplate(dataSource);
}
}
但是当我通过以下方式开始我的申请时ConfigurableApplicationContext context = SpringApplication.run(BasicConfig.class)它抛出异常。
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private javax.sql.DataSource org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration.dataSource; nested exception is org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [javax.sql.DataSource] is defined: expected single matching bean but found 2: mysqlSource,oracleSource
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:292)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1185)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:304)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:300)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:195)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:703)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:760)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:648)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:311)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:909)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:898)
at com.tigerit.tracking.Application.main(Application.java:21)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private javax.sql.DataSource org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration.dataSource; nested exception is org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [javax.sql.DataSource] is defined: expected single matching bean but found 2: mysqlSource,oracleSource
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:508)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:289)
... 15 more
Caused by: org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [javax.sql.DataSource] is defined: expected single matching bean but found 2: mysqlSource,oracleSource
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:970)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:858)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:480)
... 17 more
我不知道了。我试图用谷歌搜索它，但似乎都建议添加限定符。但我已经添加了，但没有用。请帮忙。我正在使用 Spring 4（当前版本）。
你的其中一位DataSources必须@Primary (see docs http://docs.spring.io/spring-boot/docs/current-SNAPSHOT/reference/htmlsingle/#howto-two-datasources).
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