java – 设置构造函数参数时无法解析对bean’entalManagerFactory’的引用；

​​​​​​我在我的代码中收到此错误.

org.springframework.beans.factory.BeanCreationException: Error
creating bean with name ‘roleRepository’: Cannot create inner bean
‘(inner bean)#7540dc57’ of type
[org.springframework.orm.jpa.SharedEntityManagerCreator] while setting
bean property ‘entityManager’; nested exception is
org.springframework.beans.factory.BeanCreationException: Error
creating bean with name ‘(inner bean)#7540dc57’: Cannot resolve
reference to bean ‘entityManagerFactory’ while setting constructor
argument; nested exception is
org.springframework.beans.factory.NoSuchBeanDefinitionException: No
bean named ‘entityManagerFactory’ available

我看到了这些：

Cannot resolve reference to bean ‘entityManagerFactory’ while setting constructor argument

NoSuchBeanDefinitionException: No bean named ‘entityManagerFactory’ available

NoSuchBeanDefinitionException: No bean named ‘entityManagerFactory’ is defined

他们都没有回答我的问题.问题是我能够解决问题,但我有一个问题.

让我分享我的相关代码,然后问我的问题.

@Configuration
@EnableTransactionManagement 
public class HibernateConfig {

@Bean
public LocalContainerEntityManagerFactoryBean entityManagerF() {
    LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
    em.setDataSource(dataSource());
    em.setPackagesToScan(new String[] {"com.gitreporter"});
    JpaVendorAdapter jpaAdapter = new HibernateJpaVendorAdapter();
    em.setJpaVendorAdapter(jpaAdapter);
    em.setJpaProperties(jpaProperties());

    return em;
}

@Bean
public PlatformTransactionManager jpaTransactionManager(EntityManagerFactory emf) {
    JpaTransactionManager jpaTransactionManager = new JpaTransactionManager();
    jpaTransactionManager.setEntityManagerFactory(emf);

    return jpaTransactionManager;
}

private final Properties jpaProperties() {
    Properties properties = new Properties();
    properties.setProperty("hibernate.dialect", "org.hibernate.dialect.MySQL5Dialect");

    return properties;
}


@Bean
public DataSource dataSource() {
    BasicDataSource dataSource = new BasicDataSource();
    dataSource.setDriverClassName("com.mysql.cj.jdbc.Driver");
    dataSource.setUrl("jdbc:mysql://localhost:3306/MyDBNAME?useSSL=false");
    dataSource.setUsername("username");
    dataSource.setPassword("password");

    return dataSource;
}

问题出在这条线上：

@Bean
public LocalContainerEntityManagerFactoryBean entityManagerF() {

我将medhod名称更改为entityManagerFactory,如下所示：

@Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory() {

使上下文中的工厂bean的名称等于“entityManagerFactory”,因为默认情况下,除非明确指定,否则bean的名称将等于方法名称.

我的问题：JPA API中是否存在“按惯例”它在Spring容器中寻找名为“entityManagerFactory”的EntityManagerFactory bean？当方法的名称是“entityManagerF”时,为什么它不起作用？

这是代码的其余部分：

@NoRepositoryBean
public interface GenericRepository<T, ID extends Serializable> extends JpaRepository<T, ID> {

public List<T> findByAttributeContainsText(String attributeName, String text);

}

public class GenericRepositoryImpl<T, ID extends Serializable> extends SimpleJpaRepository<T, ID>
    implements GenericRepository<T, ID> {

private EntityManager entityManager;

public GenericRepositoryImpl(JpaEntityInformation<T, ?> entityInformation, EntityManager entityManager) {
    super(entityInformation, entityManager);
    this.entityManager = entityManager;
 }
}


public interface RoleRepository extends GenericRepository<Role, Long> {

}

最佳答案 我找到了答案.

查看documentation以获取@EnableJpaRepositories注释.

在可选元素中,您将看到：

entityManagerFactoryRef
Configures the name of the EntityManagerFactory bean definition to be used to create repositories discovered through this annotation.

在页面下方查看详细信息,您将看到：

entityManagerFactoryRef

public abstract String entityManagerFactoryRef

Configures the name of
the EntityManagerFactory bean definition to be used to create
repositories discovered through this annotation. Defaults to
entityManagerFactory.

Returns:

Default: “entityManagerFactory”

因此,这种“常规”默认配置来自@EnableJpaRepositories注释本身.