Question

我正在尝试将自定义方法添加到我的spring存储库，但它会抛出错误。以下是我正在使用的代码片段。 CommonDAO有我正在尝试添加的额外方法。用户是我尝试操作的实体。问题是Spring将方法视为用户实体的属性而不是单独的方法。能不能让我知道我错过了什么？

存储库接口和实现

    public interface CommonDAO<T> {
              public T merge(T t);
         }

    public interface UserDAOJPA extends JpaRepository<User, Integer>, CommonDAO<User> {
        public User findByUsername(String userName);
    }


@Repository(value="jpaBean")
public class UserDAOImplJPA implements CommonDAO<User> {

    @PersistenceContext
    private EntityManager em;

    @Override
    public User merge(User user) {
        return em.merge(user);
    }
}

服务类

@Service
public class UserManagerJPAImpl implements UserManager {

    @Autowired
    private UserDAOJPA userDAO;


    @Override
    @Transactional
    public void insertUser(User user) {
        userDAO.save(user);
    }

    @Override
    @Transactional
    public User getUserById(int userId) {
        return userDAO.findOne(userId);
    }

    @Override
    @Transactional
    public User getUser(String username) {
        return userDAO.findByUsername(username);
    }

    @Override
    @Transactional
    public List<User> getUsers() {
        return userDAO.findAll();
    }

    @Override
    @Transactional
    public User mergeUser(User user) {
        return userDAO.merge(user);
    }

    /**
     * @param userDAO the userDAO to set
     */
    public void setUserDAO(UserDAOJPA userDAO) {
        this.userDAO = userDAO;
    }

}

测试类

public class TestTx {
    public static void main(String[] args) {
        ApplicationContext ctx =
                new ClassPathXmlApplicationContext("app-context.xml");
/*      UserManager userManagerTraditional =
                (UserManager) ctx.getBean("userManagerImpl");*/

        UserManager userManager =
                (UserManager) ctx.getBean("userManagerJPAImpl");

        User user = new User();
        user.setUsername("johndoe");
        user.setName("John Doe");

        userManager.insertUser(user);

        System.out.println("User inserted!");

        user = userManager.getUser("johndoe");

        System.out.println("\nUser fetched by username!"
                + "\nId: " + user.getId()
                + "\nUsername: " + user.getUsername()
                + "\nName: " + user.getName());

        user.setName("After change");
        userManager.mergeUser(user);
        //user = userManagerTraditional.getUserById(user.getId());

        System.out.println("\nUser fetched by ID!"
                + "\nId: " + user.getId()
                + "\nUsername: " + user.getUsername()
                + "\nName: " + user.getName());

        List<User> users = userManager.getUsers();

        System.out.println("\nUser list fetched!"
                + "\nUser count: " + users.size());
    }
}

我收到的错误 找不到类型用户的属性合并！

15：25：03,995 INFO a.LocalContainerEntityManagerFactoryBean：462 - 关闭持久性单元＆＃39; testPU＆＃39;的JPA EntityManagerFactory 线程＆＃34; main＆＃34;中的例外情况 org.springframework.beans.factory.BeanCreationException：错误使用名称＆＃39; userDAOJPA创建bean＆＃39;：调用init方法失败;嵌套异常是 org.springframework.data.mapping.PropertyReferenceException：没有找到类型用户的属性合并！在 org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean（AbstractAutowireCapableBeanFactory.java:1574）在 org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean（AbstractAutowireCapableBeanFactory.java:539）在 org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean（AbstractAutowireCapableBeanFactory.java:476）在 org.springframework.beans.factory.support.AbstractBeanFactory $ 1.getObject（AbstractBeanFactory.java:303）在 org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton（DefaultSingletonBeanRegistry.java:230）在 org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean（AbstractBeanFactory.java:299）在 org.springframework.beans.factory.support.AbstractBeanFactory.getBean（AbstractBeanFactory.java:194）在 org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons（DefaultListableBeanFactory.java:736）在 org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization（AbstractApplicationContext.java:757）在 org.springframework.context.support.AbstractApplicationContext.refresh（AbstractApplicationContext.java:480）在 org.springframework.context.support.ClassPathXmlApplicationContext。（ClassPathXmlApplicationContext.java:139）在 org.springframework.context.support.ClassPathXmlApplicationContext。（ClassPathXmlApplicationContext.java:83）在com.debopam.sprintx.TestTx.main（TestTx.java:14）引起： org.springframework.data.mapping.PropertyReferenceException：没有找到类型用户的属性合并！在 org.springframework.data.mapping.PropertyPath。（PropertyPath.java:75）在 org.springframework.data.mapping.PropertyPath.create（PropertyPath.java:327）在 org.springframework.data.mapping.PropertyPath.create（PropertyPath.java:307）在 org.springframework.data.mapping.PropertyPath.from（PropertyPath.java:270）在 org.springframework.data.mapping.PropertyPath.from（PropertyPath.java:241）在 org.springframework.data.repository.query.parser.Part。（Part.java:76）在 org.springframework.data.repository.query.parser.PartTree $ OrPart。（PartTree.java:235）在 org.springframework.data.repository.query.parser.PartTree $ Predicate.buildTree（PartTree.java:373）在 org.springframework.data.repository.query.parser.PartTree $谓词（PartTree.java:353）在 org.springframework.data.repository.query.parser.PartTree。（PartTree.java:84）在 org.springframework.data.jpa.repository.query.PartTreeJpaQuery。（PartTreeJpaQuery.java:61）在 org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy $ CreateQueryLookupStrategy.resolveQuery（JpaQueryLookupStrategy.java:95）在 org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy $ CreateIfNotFoundQueryLookupStrategy.resolveQuery（JpaQueryLookupStrategy.java:206）在 org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy $ AbstractQueryLookupStrategy.resolveQuery（JpaQueryLookupStrategy.java:73）在 org.springframework.data.repository.core.support.RepositoryFactorySupport $ QueryExecutorMethodInterceptor。（RepositoryFactorySupport.java:347）在 org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository（RepositoryFactorySupport.java:185）在 org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.initAndReturn（RepositoryFactoryBeanSupport.java:239）在 org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet（RepositoryFactoryBeanSupport.java:225）在 org.springframework.data.jpa.repository.support.JpaRepositoryFactoryBean.afterPropertiesSet（JpaRepositoryFactoryBean.java:92）在 org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods（AbstractAutowireCapableBeanFactory.java:1633）在 org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean（AbstractAutowireCapableBeanFactory.java:1570） ......还有12个

Answer 1

您的班级UserDAOImplJPA被错误地命名。实际名称应为UserDAOJPAImpl

请从文档中找到以下内容。

找到类的最重要的一点是它的名称的Impl后缀与核心存储库接口相比（见下文）。

有关详细信息，请参阅Spring Docs。

Spring JPA添加自定义方法

1 个答案: