我的代码中出现了这个错误。

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，但我对此有疑问。

先把我的相关代码分享出来，有问题再问

@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;
}

问题出在这一行:

@Bean
public LocalContainerEntityManagerFactoryBean entityManagerF() {

我将方法名称更改为 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 中是否有一个地方“按照惯例”在 Spring 容器中寻找名为“entityManagerFactory”的 EntityManagerFactory bean？为什么方法名称为“entityManagerF”时它不起作用？

下面是剩余的代码:

@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。

检查 documentation用于@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.

往下看页面的细节，你会看到这个:

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"

所以这个“常规”的默认配置来自@EnableJpaRepositories 注解本身。

关于java - 设置构造函数参数时无法解析对 bean 'entityManagerFactory' 的引用；，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/53140135/