獲取org.hibernate.MappingException：未知實體。使用Spring框架

Question

我剛剛開始在java spring framework中工作。我只是試圖用列ID和名稱填充一個簡單的表。但我得到：

未知實體：org.hibernate.MappingException

我得到的，它是經常遇到的異常。但我無法解決這個問題。你可以找到下面使用的實體，dao和hibernate配置。

HibernateConfig.java

@Getter @Setter 
@Configuration@ConfigurationProperties(prefix = "databaseConfiguration") 
public class HibernateConfig { 
    @Value("${driverClass}") 
    private String driverClass; 

    @Value("${url}") 
    private String url; 

    @Value("username") 
    private String username; 

    @Value("password") 
    private String password; 

    @Value("${hibernateDialect}") 
    private String hibernateDialect; 

    @Value("${hbm2ddlAuto}") 
    private String hbm2ddlAuto; 

    private Integer minSize; 

    private Integer maxSize; 


    @Bean 
    public DataSource dataSource() { 
     DriverManagerDataSource dataSource = new DriverManagerDataSource(); 
     dataSource.setDriverClassName(driverClass); 
     dataSource.setUrl(url); 
     dataSource.setUsername(username); 
     dataSource.setPassword(password); 
     return dataSource; 
    } 

    @Bean 
    public Properties hibernateProperties() { 
     Properties properties = new Properties(); 
     properties.put("hibernate.hbm2ddl.auto", hbm2ddlAuto); 
     properties.put("hibernate.dialect", hibernateDialect); 
     properties.put("hibernate.c3p0.min_size", minSize); 
     properties.put("hibernate.c3p0.max_size", maxSize); 
     return properties; 
    } 

    @Bean 
    public LocalSessionFactoryBean sessionFactory(DataSource dataSource) { 
     LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean(); 
     sessionFactory.setDataSource(dataSource); 
     sessionFactory.setHibernateProperties(hibernateProperties()); 
     return sessionFactory; 
} 


    @Bean 
    public ITestDao testDao() { 
     ITestDao testDao = new TestDao(); 
     return testDao; 
    } 
} 

所有屬性正在採取從.yml文件。 ITestDao是其中包含抽象add（）方法的接口。

實體類

@Getter 
@Setter 
@Entity 
@Table(name = "test") 
public class Test { 
    @Id 
    @GeneratedValue(strategy = GenerationType.IDENTITY) 
    @Column(name = "id", nullable = false, unique = true) 
    private Long id; 

    @Column(name = "dump", nullable = false) 
    private String dump; 
} 

DAO類

@Repository 
@Transactional 
@Getter 
@Setter 
public class TestDao implements ITestDao { 

    @Autowired 
    private LocalSessionFactoryBean sessionFactoryBean; 


    public Test add(Test test) { 
     try { 
       sessionFactoryBean.getObject().getCurrentSession().getTransaction().begin(); 
      sessionFactoryBean.getObject().getCurrentSession().persist(test); 

    } finally { 
      sessionFactoryBean.getObject().getCurrentSession().getTransaction().commit(); 
    } 
    return test; 
    } 

} 

服務方法調用這個DAO與@Transactional它上面的註釋。但是，儘管調用此add() DAO方法正在逐漸未知實體：

org.hibernate.MappingException

Answer 1

試試這個方法：

@Bean 
    public LocalSessionFactoryBean sessionFactory(DataSource dataSource) { 
     LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean(); 
     sessionFactory.setDataSource(dataSource); 
     sessionFactory.setPackagesToScan(new String[] { "my.package.model" });// You need to provide to adapt : my.package.model 
     sessionFactory.setHibernateProperties(hibernateProperties()); 
     return sessionFactory; 
} 

好運

Answer 2

您可能忽略下面的註釋。

@EntityScan("some.known.persistence") 

@EntityScan只能識別哪些類應該由特定的持久性上下文使用。