Java Spring数据和JPA的编译时错误

通过使用Spring数据，我正在开发一个java项目，该项目定义了规则、存储库和服务，以便按照JPA规范执行数据访问

这是我的源代码：

DALConfig:

@Configuration
@ComponentScan(basePackages = { "my.project.dal" })
@PropertySource("classpath:dbconnection.properties")
@EnableJpaRepositories("my.project.dal.repository")
@EnableTransactionManagement
public class DALConfig {

    private static final String PROPERTY_NAME_DATABASE_DRIVER = "db.driver_class";  
    private static final String PROPERTY_NAME_DATABASE_PASSWORD = "db.password";  
    private static final String PROPERTY_NAME_DATABASE_URL = "db.url";  
    private static final String PROPERTY_NAME_DATABASE_USERNAME = "db.username";  

    private static final String PROPERTY_NAME_POOL_INITIAL_SIZE = "pool.initialsize";
    private static final String PROPERTY_NAME_POOL_MAX_IDLE = "pool.maxidle";
    private static final String PROPERTY_NAME_DAL_CLASSES_PACKAGE = "entities.packages_to_scan";  
    private static final String PROPERTY_NAME_HIBERNATE_DIALECT = "hibernate.dialect";
    private static final String PROPERTY_NAME_HIBERNATE_SHOW_SQL = "hibernate.showsql";
    private static final String PROPERTY_NAME_HIBERNATE_FORMAT_SQL = "hibernate.format_sql";

    @Autowired
    private Environment environment;  

    /**
     * Method which handles the <i>dataSource</i> bean creation.
     * @return Returns a {@link DataSource} class instance which connects to the PRISMA platform DB.
     */ 
    @Bean
    public DataSource dataSource() {
        Properties props = new Properties();

        props.put("driverClassName", environment.getRequiredProperty(PROPERTY_NAME_DATABASE_DRIVER));
        props.put("url", environment.getRequiredProperty(PROPERTY_NAME_DATABASE_URL));
        props.put("username", environment.getRequiredProperty(PROPERTY_NAME_DATABASE_USERNAME));
        props.put("password", environment.getRequiredProperty(PROPERTY_NAME_DATABASE_PASSWORD));
        props.put("initialSize", environment.getRequiredProperty(PROPERTY_NAME_POOL_INITIAL_SIZE));
        props.put("maxIdle", environment.getRequiredProperty(PROPERTY_NAME_POOL_MAX_IDLE));

        BasicDataSource bds = null;
        try {
            bds = BasicDataSourceFactory.createDataSource(props);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return bds;
    }

    /**
     * Method which handles the <i>persistenceExceptionTranslationPostProcessor</i> bean creation.
     * @return Returns a {@link PersistenceExceptionTranslationPostProcessor} class instance.
     */ 
    @Bean
    public PersistenceExceptionTranslationPostProcessor persistenceExceptionTranslationPostProcessor() {
        return new PersistenceExceptionTranslationPostProcessor();
    }   

    /**
     * Method which handles the <i>hibernateExceptionTranslator</i> bean creation.
     * @return Returns a {@link HibernateExceptionTranslator} class instance which manages the Hibernate Exceltions translation into Spring's ones.
     */ 
    @Bean 
    public HibernateExceptionTranslator hibernateExceptionTranslator(){ 
      return new HibernateExceptionTranslator(); 
    }

    /**
     * Method which handles the <i>transactionManager</i> bean creation.
     * @return Returns a {@link PlatformTransactionManager} class instance.
     * @throws ClassNotFoundException
     */ 
    @Bean
    public PlatformTransactionManager transactionManager() throws ClassNotFoundException {
        JpaTransactionManager transactionManager = new JpaTransactionManager();
        transactionManager.setEntityManagerFactory(entityManagerFactory().getObject());
        return transactionManager;
    }

    /**
     * Method which handles the <i>entityManagerFactory</i> bean creation.
     * @return Returns a {@link LocalContainerEntityManagerFactoryBean} class instance.
     * @throws ClassNotFoundException
     */ 
    @Bean
    public LocalContainerEntityManagerFactoryBean entityManagerFactory() throws ClassNotFoundException {
        LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean();

        entityManagerFactoryBean.setDataSource(dataSource());
        entityManagerFactoryBean.setPackagesToScan(environment.getRequiredProperty(PROPERTY_NAME_DAL_CLASSES_PACKAGE));
        entityManagerFactoryBean.setPersistenceProviderClass(HibernatePersistenceProvider.class);

        Properties jpaProperties = new Properties();
        jpaProperties.put(PROPERTY_NAME_HIBERNATE_DIALECT, environment.getRequiredProperty(PROPERTY_NAME_HIBERNATE_DIALECT));
        jpaProperties.put(PROPERTY_NAME_HIBERNATE_FORMAT_SQL, environment.getRequiredProperty(PROPERTY_NAME_HIBERNATE_FORMAT_SQL));
        jpaProperties.put(PROPERTY_NAME_HIBERNATE_SHOW_SQL, environment.getRequiredProperty(PROPERTY_NAME_HIBERNATE_SHOW_SQL));

        entityManagerFactoryBean.setJpaProperties(jpaProperties);

        return entityManagerFactoryBean;
    }

}

@Repository
public interface IUserRepository extends CrudRepository<User, String> { }

@Service
public class UserService {

    @Autowired
    private IUserRepository repository;

    @PersistenceContext
    EntityManager em;

    /**
     * Method which finds a {@link User} by the provided <i>username</i>.
     * 
     * @param username
     *            The username of the {@link User} to be found.
     * @return Returns the found {@link User}.
     * @throws DataRetrievalFailureException
     *             If the User doesn't exist in the DB.
     * @throws IllegalArgumentException
     *             If the <i>username</i> is <i>null</i>
     */
    public User find(String username) throws DataRetrievalFailureException,
            IllegalArgumentException {
        User user = repository.findOne(username);
        if (user == null)
            throw new DataRetrievalFailureException("User with username = \""
                    + username + "\" not found");
        return user;
    }

    /**
     * Method which inserts the provided {@link User}.
     * 
     * @param user
     *            The {@link User} to be inserted.
     * @return Returns the inserted {@link User}. Use the returned instance for
     *         further operations as the insert operation might have changed the
     *         entity instance completely.
     * @throws DuplicateKeyException
     *             If the <i>user</i> already exists in the DB.
     * @throws IllegalArgumentException
     *             If the username of the <i>user</i> is <i>null</i>
     * @throws JpaSystemException
     *             If a unique field is already in the DB.
     */
    public User insert(User user) throws DuplicateKeyException,
            JpaSystemException {
        if (repository.exists(user.getUsername()))
            throw new DuplicateKeyException("User with username = \""
                    + user.getUsername() + "\" already exists");
        return repository.save(user);
    }

    /**
     * Method which deletes the {@link User} identifiedy by <i>username</i>.
     * 
     * @param username
     *            The username of the {@link User} to be deleted.
     * @throws EmptyResultDataAccessException
     *             If a {@link User} with the provided <i>username</i> doesn't
     *             exist in the DB.
     * @throws IllegalArgumentException
     *             If the <i>username</i> is <i>null</i>
     */
    public void delete(String username) throws EmptyResultDataAccessException,
            IllegalArgumentException {
        repository.delete(username);
    }

    /**
     * Method which updates the provided {@link User} <i>user</i> in the DB.
     * 
     * @param user
     *            The updated {@link User}.
     * @return Returns the updated {@link User}. Use the returned instance for
     *         further operations as the insert operation might have changed the
     *         entity instance completely.
     * @throws DataRetrievalFailureException
     *             If the <i>user</i> doesn't exist in the DB.
     * @throws IllegalArgumentException
     *             If the username of the <i>user</i> is <i>null</i>
     */
    public User update(User user) throws DataRetrievalFailureException {
        if (!repository.exists(user.getUsername()))
            throw new DataRetrievalFailureException("User with username = \""
                    + user.getUsername() + "\" not found");
        return repository.save(user);
    }
}

@配置
@ComponentScan（basePackages={“my.project.dal”}）
@PropertySource（“classpath:dbconnection.properties”）
@EnableJpaRepositories（“my.project.dal.repository”）
@启用事务管理
公共类DALConfig{
私有静态最终字符串属性\u NAME\u DATABASE\u DRIVER=“db.DRIVER\u class”；
私有静态最终字符串属性\u NAME\u DATABASE\u PASSWORD=“db.PASSWORD”；
私有静态最终字符串属性\u NAME\u DATABASE\u URL=“db.URL”；
私有静态最终字符串属性\u NAME\u DATABASE\u USERNAME=“db.USERNAME”；
私有静态最终字符串属性\u NAME\u POOL\u INITIAL\u SIZE=“POOL.initialsize”；
私有静态最终字符串属性\u NAME\u POOL\u MAX\u IDLE=“POOL.maxidle”；
私有静态最终字符串属性\u NAME\u DAL\u CLASSES\u PACKAGE=“entities.packages\u to\u scan”；
私有静态最终字符串属性\u NAME\u HIBERNATE\u dialogue=“HIBERNATE.dialogue”；
私有静态最终字符串属性\u NAME\u HIBERNATE\u SHOW\u SQL=“HIBERNATE.showsql”；
私有静态最终字符串属性\u NAME\u HIBERNATE\u FORMAT\u SQL=“HIBERNATE.FORMAT\u SQL”；
@自动连线
私人环境；
/**
*方法，该方法处理数据源bean的创建。
*@return返回连接到PRISMA平台数据库的{@link DataSource}类实例。
*/ 
@豆子
公共数据源数据源（）{
Properties props=新属性（）；
put（“driverClassName”，environment.getRequiredProperty（PROPERTY\u NAME\u DATABASE\u DRIVER））；
props.put（“url”，environment.getRequiredProperty（PROPERTY\u NAME\u DATABASE\u url））；
props.put（“username”，environment.getRequiredProperty（PROPERTY\u NAME\u DATABASE\u username））；
props.put（“password”，environment.getRequiredProperty（PROPERTY\u NAME\u DATABASE\u password））；
props.put（“initialSize”，environment.getRequiredProperty（PROPERTY\u NAME\u POOL\u INITIAL\u SIZE））；
props.put（“maxIdle”，environment.getRequiredProperty（PROPERTY\u NAME\u POOL\u MAX\u IDLE））；
BasicDataSource bds=null；
试一试{
bds=BasicDataSourceFactory.createDataSource（props）；
}捕获（例外e）{
//TODO自动生成的捕捉块
e、 printStackTrace（）；
}
返回bds；
}
/**
*方法，该方法处理persistenceExceptionTranslationPostProcessor bean创建。
*@return返回{@link PersistenceExceptionTranslationPostProcessor}类实例。
*/ 
@豆子
公共PersistenceExceptionTranslationPostProcessor PersistenceExceptionTranslationPostProcessor（）{
返回新的PersistenceExceptionTranslationPostProcessor（）；
}   
/**
*方法，该方法处理hibernateExceptionTranslator bean的创建。
*@return返回一个{@link HibernateExceptionTranslator}类实例，该实例管理将Hibernate卓越转换为Spring卓越的转换。
*/ 
@豆子
公共HibernateExceptionTranslator HibernateExceptionTranslator（）{
返回新的HibernateeExceptionTranslator（）；
}
/**
*方法，该方法处理transactionManager bean的创建。
*@return返回一个{@link PlatformTransactionManager}类实例。
*@ClassNotFoundException
*/ 
@豆子
公共平台transactionManager transactionManager（）引发ClassNotFoundException{
JpaTransactionManager transactionManager=新的JpaTransactionManager（）；
transactionManager.setEntityManagerFactory（entityManagerFactory（）.getObject（））；
返回事务管理器；
}
/**
*方法，该方法处理entityManagerFactory bean的创建。
*@return返回一个{@link LocalContainerEntityManagerFactoryBean}类实例。
*@ClassNotFoundException
*/ 
@豆子
public LocalContainerEntityManagerFactoryBean entityManagerFactory（）引发ClassNotFoundException{
LocalContainerEntityManagerFactoryBean entityManagerFactoryBean=新的LocalContainerEntityManagerFactoryBean（）；
setDataSource（dataSource（））；
entityManagerFactoryBean.setPackagesToScan（环境.getRequiredProperty（属性\名称\类\包））；
entityManagerFactoryBean.setPersistenceProviderClass（HibernatePersistenceProvider.class）；
Properties JPAPProperties=新属性（）；
jpaProperties.put（PROPERTY_NAME_HIBERNATE_方言，environment.getRequiredProperty（PROPERTY_NAME_HIBERNATE_方言））；
jpaProperties.put（PROPERTY_NAME_HIBERNATE_FORMAT_SQL，environment.getRequiredProperty（PROPERTY_NAME_HIBERNATE_FORMAT_SQL））；
jpaProperties.put（PROPERTY_NAME_HIBERNATE_SHOW_SQL，environment.getRequiredProperty（PROPERTY_NAME_HIBERNATE_SHOW_SQL））；
entityManagerFactoryBean.setJPapProperties（JPapProperties）；
返回entityManagerFactoryBean；
}
}

IUserRepository:

@Configuration
@ComponentScan(basePackages = { "my.project.dal" })
@PropertySource("classpath:dbconnection.properties")
@EnableJpaRepositories("my.project.dal.repository")
@EnableTransactionManagement
public class DALConfig {

    private static final String PROPERTY_NAME_DATABASE_DRIVER = "db.driver_class";  
    private static final String PROPERTY_NAME_DATABASE_PASSWORD = "db.password";  
    private static final String PROPERTY_NAME_DATABASE_URL = "db.url";  
    private static final String PROPERTY_NAME_DATABASE_USERNAME = "db.username";  

    private static final String PROPERTY_NAME_POOL_INITIAL_SIZE = "pool.initialsize";
    private static final String PROPERTY_NAME_POOL_MAX_IDLE = "pool.maxidle";
    private static final String PROPERTY_NAME_DAL_CLASSES_PACKAGE = "entities.packages_to_scan";  
    private static final String PROPERTY_NAME_HIBERNATE_DIALECT = "hibernate.dialect";
    private static final String PROPERTY_NAME_HIBERNATE_SHOW_SQL = "hibernate.showsql";
    private static final String PROPERTY_NAME_HIBERNATE_FORMAT_SQL = "hibernate.format_sql";

    @Autowired
    private Environment environment;  

    /**
     * Method which handles the <i>dataSource</i> bean creation.
     * @return Returns a {@link DataSource} class instance which connects to the PRISMA platform DB.
     */ 
    @Bean
    public DataSource dataSource() {
        Properties props = new Properties();

        props.put("driverClassName", environment.getRequiredProperty(PROPERTY_NAME_DATABASE_DRIVER));
        props.put("url", environment.getRequiredProperty(PROPERTY_NAME_DATABASE_URL));
        props.put("username", environment.getRequiredProperty(PROPERTY_NAME_DATABASE_USERNAME));
        props.put("password", environment.getRequiredProperty(PROPERTY_NAME_DATABASE_PASSWORD));
        props.put("initialSize", environment.getRequiredProperty(PROPERTY_NAME_POOL_INITIAL_SIZE));
        props.put("maxIdle", environment.getRequiredProperty(PROPERTY_NAME_POOL_MAX_IDLE));

        BasicDataSource bds = null;
        try {
            bds = BasicDataSourceFactory.createDataSource(props);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return bds;
    }

    /**
     * Method which handles the <i>persistenceExceptionTranslationPostProcessor</i> bean creation.
     * @return Returns a {@link PersistenceExceptionTranslationPostProcessor} class instance.
     */ 
    @Bean
    public PersistenceExceptionTranslationPostProcessor persistenceExceptionTranslationPostProcessor() {
        return new PersistenceExceptionTranslationPostProcessor();
    }   

    /**
     * Method which handles the <i>hibernateExceptionTranslator</i> bean creation.
     * @return Returns a {@link HibernateExceptionTranslator} class instance which manages the Hibernate Exceltions translation into Spring's ones.
     */ 
    @Bean 
    public HibernateExceptionTranslator hibernateExceptionTranslator(){ 
      return new HibernateExceptionTranslator(); 
    }

    /**
     * Method which handles the <i>transactionManager</i> bean creation.
     * @return Returns a {@link PlatformTransactionManager} class instance.
     * @throws ClassNotFoundException
     */ 
    @Bean
    public PlatformTransactionManager transactionManager() throws ClassNotFoundException {
        JpaTransactionManager transactionManager = new JpaTransactionManager();
        transactionManager.setEntityManagerFactory(entityManagerFactory().getObject());
        return transactionManager;
    }

    /**
     * Method which handles the <i>entityManagerFactory</i> bean creation.
     * @return Returns a {@link LocalContainerEntityManagerFactoryBean} class instance.
     * @throws ClassNotFoundException
     */ 
    @Bean
    public LocalContainerEntityManagerFactoryBean entityManagerFactory() throws ClassNotFoundException {
        LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean();

        entityManagerFactoryBean.setDataSource(dataSource());
        entityManagerFactoryBean.setPackagesToScan(environment.getRequiredProperty(PROPERTY_NAME_DAL_CLASSES_PACKAGE));
        entityManagerFactoryBean.setPersistenceProviderClass(HibernatePersistenceProvider.class);

        Properties jpaProperties = new Properties();
        jpaProperties.put(PROPERTY_NAME_HIBERNATE_DIALECT, environment.getRequiredProperty(PROPERTY_NAME_HIBERNATE_DIALECT));
        jpaProperties.put(PROPERTY_NAME_HIBERNATE_FORMAT_SQL, environment.getRequiredProperty(PROPERTY_NAME_HIBERNATE_FORMAT_SQL));
        jpaProperties.put(PROPERTY_NAME_HIBERNATE_SHOW_SQL, environment.getRequiredProperty(PROPERTY_NAME_HIBERNATE_SHOW_SQL));

        entityManagerFactoryBean.setJpaProperties(jpaProperties);

        return entityManagerFactoryBean;
    }

}

@Repository
public interface IUserRepository extends CrudRepository<User, String> { }

@Service
public class UserService {

    @Autowired
    private IUserRepository repository;

    @PersistenceContext
    EntityManager em;

    /**
     * Method which finds a {@link User} by the provided <i>username</i>.
     * 
     * @param username
     *            The username of the {@link User} to be found.
     * @return Returns the found {@link User}.
     * @throws DataRetrievalFailureException
     *             If the User doesn't exist in the DB.
     * @throws IllegalArgumentException
     *             If the <i>username</i> is <i>null</i>
     */
    public User find(String username) throws DataRetrievalFailureException,
            IllegalArgumentException {
        User user = repository.findOne(username);
        if (user == null)
            throw new DataRetrievalFailureException("User with username = \""
                    + username + "\" not found");
        return user;
    }

    /**
     * Method which inserts the provided {@link User}.
     * 
     * @param user
     *            The {@link User} to be inserted.
     * @return Returns the inserted {@link User}. Use the returned instance for
     *         further operations as the insert operation might have changed the
     *         entity instance completely.
     * @throws DuplicateKeyException
     *             If the <i>user</i> already exists in the DB.
     * @throws IllegalArgumentException
     *             If the username of the <i>user</i> is <i>null</i>
     * @throws JpaSystemException
     *             If a unique field is already in the DB.
     */
    public User insert(User user) throws DuplicateKeyException,
            JpaSystemException {
        if (repository.exists(user.getUsername()))
            throw new DuplicateKeyException("User with username = \""
                    + user.getUsername() + "\" already exists");
        return repository.save(user);
    }

    /**
     * Method which deletes the {@link User} identifiedy by <i>username</i>.
     * 
     * @param username
     *            The username of the {@link User} to be deleted.
     * @throws EmptyResultDataAccessException
     *             If a {@link User} with the provided <i>username</i> doesn't
     *             exist in the DB.
     * @throws IllegalArgumentException
     *             If the <i>username</i> is <i>null</i>
     */
    public void delete(String username) throws EmptyResultDataAccessException,
            IllegalArgumentException {
        repository.delete(username);
    }

    /**
     * Method which updates the provided {@link User} <i>user</i> in the DB.
     * 
     * @param user
     *            The updated {@link User}.
     * @return Returns the updated {@link User}. Use the returned instance for
     *         further operations as the insert operation might have changed the
     *         entity instance completely.
     * @throws DataRetrievalFailureException
     *             If the <i>user</i> doesn't exist in the DB.
     * @throws IllegalArgumentException
     *             If the username of the <i>user</i> is <i>null</i>
     */
    public User update(User user) throws DataRetrievalFailureException {
        if (!repository.exists(user.getUsername()))
            throw new DataRetrievalFailureException("User with username = \""
                    + user.getUsername() + "\" not found");
        return repository.save(user);
    }
}

@存储库
公共接口IUserRepository扩展了Crudepository{}

用户服务：

@Configuration
@ComponentScan(basePackages = { "my.project.dal" })
@PropertySource("classpath:dbconnection.properties")
@EnableJpaRepositories("my.project.dal.repository")
@EnableTransactionManagement
public class DALConfig {

    private static final String PROPERTY_NAME_DATABASE_DRIVER = "db.driver_class";  
    private static final String PROPERTY_NAME_DATABASE_PASSWORD = "db.password";  
    private static final String PROPERTY_NAME_DATABASE_URL = "db.url";  
    private static final String PROPERTY_NAME_DATABASE_USERNAME = "db.username";  

    private static final String PROPERTY_NAME_POOL_INITIAL_SIZE = "pool.initialsize";
    private static final String PROPERTY_NAME_POOL_MAX_IDLE = "pool.maxidle";
    private static final String PROPERTY_NAME_DAL_CLASSES_PACKAGE = "entities.packages_to_scan";  
    private static final String PROPERTY_NAME_HIBERNATE_DIALECT = "hibernate.dialect";
    private static final String PROPERTY_NAME_HIBERNATE_SHOW_SQL = "hibernate.showsql";
    private static final String PROPERTY_NAME_HIBERNATE_FORMAT_SQL = "hibernate.format_sql";

    @Autowired
    private Environment environment;  

    /**
     * Method which handles the <i>dataSource</i> bean creation.
     * @return Returns a {@link DataSource} class instance which connects to the PRISMA platform DB.
     */ 
    @Bean
    public DataSource dataSource() {
        Properties props = new Properties();

        props.put("driverClassName", environment.getRequiredProperty(PROPERTY_NAME_DATABASE_DRIVER));
        props.put("url", environment.getRequiredProperty(PROPERTY_NAME_DATABASE_URL));
        props.put("username", environment.getRequiredProperty(PROPERTY_NAME_DATABASE_USERNAME));
        props.put("password", environment.getRequiredProperty(PROPERTY_NAME_DATABASE_PASSWORD));
        props.put("initialSize", environment.getRequiredProperty(PROPERTY_NAME_POOL_INITIAL_SIZE));
        props.put("maxIdle", environment.getRequiredProperty(PROPERTY_NAME_POOL_MAX_IDLE));

        BasicDataSource bds = null;
        try {
            bds = BasicDataSourceFactory.createDataSource(props);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return bds;
    }

    /**
     * Method which handles the <i>persistenceExceptionTranslationPostProcessor</i> bean creation.
     * @return Returns a {@link PersistenceExceptionTranslationPostProcessor} class instance.
     */ 
    @Bean
    public PersistenceExceptionTranslationPostProcessor persistenceExceptionTranslationPostProcessor() {
        return new PersistenceExceptionTranslationPostProcessor();
    }   

    /**
     * Method which handles the <i>hibernateExceptionTranslator</i> bean creation.
     * @return Returns a {@link HibernateExceptionTranslator} class instance which manages the Hibernate Exceltions translation into Spring's ones.
     */ 
    @Bean 
    public HibernateExceptionTranslator hibernateExceptionTranslator(){ 
      return new HibernateExceptionTranslator(); 
    }

    /**
     * Method which handles the <i>transactionManager</i> bean creation.
     * @return Returns a {@link PlatformTransactionManager} class instance.
     * @throws ClassNotFoundException
     */ 
    @Bean
    public PlatformTransactionManager transactionManager() throws ClassNotFoundException {
        JpaTransactionManager transactionManager = new JpaTransactionManager();
        transactionManager.setEntityManagerFactory(entityManagerFactory().getObject());
        return transactionManager;
    }

    /**
     * Method which handles the <i>entityManagerFactory</i> bean creation.
     * @return Returns a {@link LocalContainerEntityManagerFactoryBean} class instance.
     * @throws ClassNotFoundException
     */ 
    @Bean
    public LocalContainerEntityManagerFactoryBean entityManagerFactory() throws ClassNotFoundException {
        LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean();

        entityManagerFactoryBean.setDataSource(dataSource());
        entityManagerFactoryBean.setPackagesToScan(environment.getRequiredProperty(PROPERTY_NAME_DAL_CLASSES_PACKAGE));
        entityManagerFactoryBean.setPersistenceProviderClass(HibernatePersistenceProvider.class);

        Properties jpaProperties = new Properties();
        jpaProperties.put(PROPERTY_NAME_HIBERNATE_DIALECT, environment.getRequiredProperty(PROPERTY_NAME_HIBERNATE_DIALECT));
        jpaProperties.put(PROPERTY_NAME_HIBERNATE_FORMAT_SQL, environment.getRequiredProperty(PROPERTY_NAME_HIBERNATE_FORMAT_SQL));
        jpaProperties.put(PROPERTY_NAME_HIBERNATE_SHOW_SQL, environment.getRequiredProperty(PROPERTY_NAME_HIBERNATE_SHOW_SQL));

        entityManagerFactoryBean.setJpaProperties(jpaProperties);

        return entityManagerFactoryBean;
    }

}

@Repository
public interface IUserRepository extends CrudRepository<User, String> { }

@Service
public class UserService {

    @Autowired
    private IUserRepository repository;

    @PersistenceContext
    EntityManager em;

    /**
     * Method which finds a {@link User} by the provided <i>username</i>.
     * 
     * @param username
     *            The username of the {@link User} to be found.
     * @return Returns the found {@link User}.
     * @throws DataRetrievalFailureException
     *             If the User doesn't exist in the DB.
     * @throws IllegalArgumentException
     *             If the <i>username</i> is <i>null</i>
     */
    public User find(String username) throws DataRetrievalFailureException,
            IllegalArgumentException {
        User user = repository.findOne(username);
        if (user == null)
            throw new DataRetrievalFailureException("User with username = \""
                    + username + "\" not found");
        return user;
    }

    /**
     * Method which inserts the provided {@link User}.
     * 
     * @param user
     *            The {@link User} to be inserted.
     * @return Returns the inserted {@link User}. Use the returned instance for
     *         further operations as the insert operation might have changed the
     *         entity instance completely.
     * @throws DuplicateKeyException
     *             If the <i>user</i> already exists in the DB.
     * @throws IllegalArgumentException
     *             If the username of the <i>user</i> is <i>null</i>
     * @throws JpaSystemException
     *             If a unique field is already in the DB.
     */
    public User insert(User user) throws DuplicateKeyException,
            JpaSystemException {
        if (repository.exists(user.getUsername()))
            throw new DuplicateKeyException("User with username = \""
                    + user.getUsername() + "\" already exists");
        return repository.save(user);
    }

    /**
     * Method which deletes the {@link User} identifiedy by <i>username</i>.
     * 
     * @param username
     *            The username of the {@link User} to be deleted.
     * @throws EmptyResultDataAccessException
     *             If a {@link User} with the provided <i>username</i> doesn't
     *             exist in the DB.
     * @throws IllegalArgumentException
     *             If the <i>username</i> is <i>null</i>
     */
    public void delete(String username) throws EmptyResultDataAccessException,
            IllegalArgumentException {
        repository.delete(username);
    }

    /**
     * Method which updates the provided {@link User} <i>user</i> in the DB.
     * 
     * @param user
     *            The updated {@link User}.
     * @return Returns the updated {@link User}. Use the returned instance for
     *         further operations as the insert operation might have changed the
     *         entity instance completely.
     * @throws DataRetrievalFailureException
     *             If the <i>user</i> doesn't exist in the DB.
     * @throws IllegalArgumentException
     *             If the username of the <i>user</i> is <i>null</i>
     */
    public User update(User user) throws DataRetrievalFailureException {
        if (!repository.exists(user.getUsername()))
            throw new DataRetrievalFailureException("User with username = \""
                    + user.getUsername() + "\" not found");
        return repository.save(user);
    }
}

@服务
公共类用户服务{
@自动连线
私有IUSER存储库；
@持久上下文
实体管理器；
/**
*方法，该方法通过提供的用户名查找{@link User}。
* 
*@param用户名
*要找到的{@link User}的用户名。
*@return返回找到的{@link User}。
*@抛出DataRetrievalFailureException
*如果用户在数据库中不存在。
*@galargumentException
*如果用户名为空
*/
公共用户查找（字符串用户名）引发DataRetrievalFailureException，
非法辩论例外{
User=repository.findOne（用户名）；
如果（用户）==