無法映射第二類：** org.hibernate.MappingException：來自表employee的關聯指的是未映射的類**

Question

我正在處理代碼，因爲我無法映射其他類，因爲我已經兩個階級，這個代碼用一個類工作得很好，我做錯了，請檢查代碼：

department.hbm.xml

​​

employee.hbm.xml

<hibernate-mapping> 
    <class name="com.java.commons.Employee" table="employee"> 
     <id name="id" column="id" type="long"> 
      <generator class="identity" /> 
     </id> 
     <property name="firstName" type="String" column="firstName" /> 
     <property name="salary" column="salary" /> 
     <many-to-one name="department" class="Department" column="department" /> 
    </class> 
</hibernate-mapping> 

和connection.cfg.xml

<hibernate-configuration> 
    <session-factory> 
     <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property> 
     <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property> 
     <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/justhibernate</property> 
     <property name="hibernate.connection.username">root</property> 
     <property name="hibernate.connection.password">root</property> 
     <property name="hibernate.show_sql">true</property> 
     <property name="hibernate.hbm2ddl.auto">create</property> 
     <property name="hibernate.order_inserts">true</property> 
     <property name="hibernate.order_updates">true</property> 
     <property name="hibernate.jdbc.batch_size">2</property> 

     <mapping resource="employee.hbm.xml" /> 
     <mapping resource="department.hbm.xml" /> 


    </session-factory> 

</hibernate-configuration> 

connection.java

public static SessionFactory buldSessionFactory() { 
     SessionFactory sessionFactory = null; 
     try { 
      sessionFactory = new Configuration().configure("connection.cfg.xml").addResource("department.hbm.xml") 
        .addResource("employee.hbm.xml").buildSessionFactory(); 
      System.out.println("session Factory created"); 
     } catch (Throwable ex) { 
      System.err.println("Session Factory creation Failed " + ex); 
      throw new ExceptionInInitializerError(ex); 
     } 
     return sessionFactory; 

    } 

錯誤日誌

Session Factory creation Failed org.hibernate.MappingException: An association from the table employee refers to an unmapped class: Department 
Exception in thread "main" java.lang.ExceptionInInitializerError 
    at com.java.commons.HibernateUtil.buldSessionFactory(HibernateUtil.java:16) 
    at com.java.save_data.SavingData.savingData(SavingData.java:9) 
    at com.java.save_data.SavingData.main(SavingData.java:15) 
Caused by: org.hibernate.MappingException: An association from the table employee refers to an unmapped class: Department 
    at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.secondPassCompileForeignKeys(InFlightMetadataCollectorImpl.java:1838) 
    at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.secondPassCompileForeignKeys(InFlightMetadataCollectorImpl.java:1809) 
    at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.processSecondPasses(InFlightMetadataCollectorImpl.java:1627) 
    at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:278) 
    at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.build(MetadataBuildingProcess.java:83) 
    at org.hibernate.boot.internal.MetadataBuilderImpl.build(MetadataBuilderImpl.java:418) 
    at org.hibernate.boot.internal.MetadataBuilderImpl.build(MetadataBuilderImpl.java:87) 
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:692) 
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:724) 
    at com.java.commons.HibernateUtil.buldSessionFactory(HibernateUtil.java:12) 
    ... 2 more 

Employee.java

public class Employee { 

    private long id; 
    private String firstName; 
    private String salary; 
    private Department department; 

    public Employee() { 
    } 



    public Employee(String firstName, String salary, Department department) { 
     this.firstName = firstName; 
     this.salary = salary; 
     this.department = department; 
    } 

    public long getId() { 
     return id; 
    } 

    public void setId(long id) { 
     this.id = id; 
    } 

    public String getFirstName() { 
     return firstName; 
    } 

    public void setFirstName(String firstName) { 
     this.firstName = firstName; 
    } 

    public String getSalary() { 
     return salary; 
    } 

    public void setSalary(String salary) { 
     this.salary = salary; 
    } 

    public Department getDepartment() { 
     return department; 
    } 

    public void setDepartment(Department department) { 
     this.department = department; 
    } 
} 

department.java

public class Department { 
    private long id; 
    private String deptName; 

    public Department() { 
    } 

    public long getId() { 
     return id; 
    } 

    public void setId(long id) { 
     this.id = id; 
    } 

    public String getDeptName() { 
     return deptName; 
    } 

    public void setDeptName(String deptName) { 
     this.deptName = deptName; 
    } 

    public Department(String deptName) { 
     this.deptName = deptName; 
    } 

} 

錯誤日誌中說，員工被映射到非映射類部爲什麼呢？以及如何解決當一個正在與更多的兩個班... 任何幫助將不勝感激 關心和感謝。

Answer 1

使用完全合格的類名

<many-to-one name="department" class="com.java.commons.Department" column="department" /> 

細則Many-To-One