Spring JPA通用基础存储库

Question

这可能与已经被问到的其他几个问题类似，但我无法找到我得到的错误的确切答案。我正在尝试在Spring JPA中构建泛型基类

基接口：

@NoRepositoryBean
public interface GenericRepository <T, ID extends Serializable>
{
    public T handleCustom(String id);
}

实现类：

@SuppressWarnings("serial")
public class GenericRepositoryImpl<T, ID extends Serializable>
 implements GenericRepository<T, ID>
{
    @PersistenceContext
    private EntityManager entityManager;

    Class type;

    public T handleCustom(String id)
    {
        Annotation[] ann = type.getAnnotations();

        return null;
    }
}

特定于域的类：

public interface DomainRepository 
   extends JpaRepository<Domain, String>,
   GenericRepository<Domain, String>
{

}

实体：

@Entity
public class Domain extends ParentEntity
{
    @Id
    private String domainId;
    private String domainName;

    public Domain()
    {

    }
    //setters getters
   .....
}

配置文件：

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(basePackages = "com.rabbitmq.jpa" )
public class JPAConfig
{
}

以下错误：

org.springframework.beans.factory.BeanCreationException: 
    Error creating bean with name 'domainRepository': 
       Invocation of init method failed; 
       nested exception is org.springframework.data.mapping.PropertyReferenceException: 
    No property handleCustom found for type Domain!

我到底做错了什么。

Answer 1

我用下面的配置实现了这个功能：

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(basePackages = "com.rabbitmq.jpa",repositoryBaseClass = GenericRepositoryImpl.class )
public class JPAConfig
{
}

基接口：

@NoRepositoryBean
public interface GenericRepository <T, ID extends Serializable> extends JpaRepository<T, ID>
{
    public T handleCustom(String id);
}

实现类：

    @NoRepositoryBean
    public class GenericRepositoryImpl<T, ID extends Serializable> extends SimpleJpaRepository<T, ID> implements GenericRepository<T, ID>
    {
        protected final EntityManager entityManager;

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

        Class type;

        public T handleCustom(String id)
        {
            Annotation[] ann = type.getAnnotations();

            return null;
        }
    }

特定于域的类：

@Repository
@Transactional(readOnly = true)
public interface DomainRepository extends GenericRepository <Domain, String>
{

}

Answer 2

您的自定义存储库功能的实现必须是Spring数据接口的名称+ "Impl“，而不是ypur接口的名称+ "Impl”。因此，在您的示例中，实现类必须是DomainRepositoryImpl而不是GenericRepositoryImpl。

请参阅spring文档以供参考。

http://docs.spring.io/spring-data/data-jpa/docs/current/reference/html/#repositories.custom-implementations