@Autowired
@Qualifier("primaryEntityManagerFactory")
private EntityManager primaryEntityManager;
@Primary
@Bean(name = "primaryEntityManagerFactory")
public LocalContainerEntityManagerFactoryBean primaryEntityManagerFactory(EntityManagerFactoryBuilder builder, @Qualifier("primaryDataSource") DataSource dataSource) throws NamingException {
return builder
.dataSource(dataSource)
.properties(getVendorProperties(this.primaryDataSource(this.primaryDataSourceProperties())))
.packages("abc")
.build();
}
@Qualifier注解的作用是指定name进行注入
此时会找到LocalContainerEntityManagerFactoryBean进行注入，但LocalContainerEntityManagerFactoryBean不是EntityManager，为什么没有报错而且代码正常运行了呢？
请教了下G老师，G老师的回答是：
总结就是LocalContainerEntityManagerFactoryBean被用来创建一个EntityManagerFactory实例，EntityManagerFactory又被用来创建EntityManager实例。 标签：primaryDataSource,EntityManager,Qualifier,EntityManger,JPA,dataSource,LocalConta From： https://www.cnblogs.com/onejay/p/17349301.html