関係whith hibernate

Question

私はEclipse、Xammp（tomcatとMySQL DB）とHibernateを使用しています。

私はrelationshiptのようなものを作成します。

私のエンティティクラス：

package Dto; 

import java.util.HashSet; 
import java.util.Set; 

import javax.persistence.CascadeType; 
import javax.persistence.Column; 
import javax.persistence.Entity; 
import javax.persistence.GeneratedValue; 
import javax.persistence.Id; 
import javax.persistence.JoinTable; 
import javax.persistence.ManyToMany; 
import javax.persistence.Table; 
import javax.persistence.JoinColumn; 

@Entity 
@Table(name="EMPLOYEE") 
public class Employee { 

    @Id 
    @Column(name="EMPLOYEE_ID") 
    @GeneratedValue 
    private Long employeeId; 

    @Column(name="FIRSTNAME") 
    private String firstname; 

    @Column(name="LASTNAME") 
    private String lastname; 


    @ManyToMany(cascade={CascadeType.ALL}) 
    @JoinTable(name="EMPLOYEE_COLLEAGUE", 
     joinColumns={@JoinColumn(name="EMPLOYEE_ID")}, 
     inverseJoinColumns={@JoinColumn(name="COLLEAGUE_ID")}) 
    private Set<Employee> colleagues = new HashSet<Employee>(); 

    @ManyToMany(mappedBy="colleagues") 
    private Set<Employee> teammates = new HashSet<Employee>(); 

    public Employee() { 
    } 

    public Employee(String firstname, String lastname) { 
     this.firstname = firstname; 
     this.lastname = lastname; 
    } 

    //Getter and Setter... 
     ... 
} 

私のhbm.xml：

<?xml version="1.0"?> 
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" 
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> 
<!-- Generated 23.05.2016 15:44:11 by Hibernate Tools 3.5.0.Final --> 
<hibernate-mapping> 
    <class name="Dto.Employee" table="EMPLOYEE"> 
     <id name="employeeId" type="java.lang.Long"> 
      <column name="EMPLOYEEID" /> 
      <generator class="native" /> 
     </id> 
     <property name="firstname" type="java.lang.String"> 
      <column name="FIRSTNAME" /> 
     </property> 
     <property name="lastname" type="java.lang.String"> 
      <column name="LASTNAME" /> 
     </property> 
     <set name="colleagues" table="EMPLOYEE" inverse="false" lazy="true"> 
      <key> 
       <column name="EMPLOYEEID" /> 
      </key> 
      <one-to-many class="Dto.Employee" /> 
     </set> 
     <set name="teammates" table="EMPLOYEE" inverse="false" lazy="true"> 
      <key> 
       <column name="EMPLOYEEID" /> 
      </key> 
      <one-to-many class="Dto.Employee" /> 
     </set> 
    </class> 
</hibernate-mapping> 

マイhibernate.cfg.xmlの

<?xml version="1.0" encoding="UTF-8"?> 
<!DOCTYPE hibernate-configuration PUBLIC 
     "-//Hibernate/Hibernate Configuration DTD 3.0//EN" 
     "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"> 
<hibernate-configuration> 
    <session-factory> 
     <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property> 
     <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/Hibernate</property> 
     <property name="hibernate.connection.username">root</property> 
     <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property> 
     <property name="hbm2ddl.auto">create-drop</property> 

     <mapping resource="Dto/Employee.hbm.xml" /> 
    </session-factory> 
</hibernate-configuration> 

私のメインクラス：

Configuration configuration = new Configuration(); 
     configuration.configure("resources/hibernate.cfg.xml"); 

     SessionFactory sessionFactory = configuration.buildSessionFactory(); 

     Session session = sessionFactory.openSession(); 

     session.beginTransaction(); 



      Employee employee1 = new Employee("Sergey", "Brin"); 
      Employee employee2 = new Employee("Larry", "Page"); 
      Employee employee3 = new Employee("Marrisa", "Mayer"); 
      Employee employee4 = new Employee("Matt", "Cutts"); 

      employee1.getColleagues().add(employee3); 
//   employee1.getColleagues().add(employee4); 


      session.save(employee1); 
      session.save(employee2); 
      session.save(employee3); 
      session.save(employee4); 

      session.getTransaction().commit(); 
      session.close(); 

マイエラー：

log4j:WARN No appenders could be found for logger (org.jboss.logging). 
log4j:WARN Please initialize the log4j system properly. 
Exception in thread "main" org.hibernate.exception.ConstraintViolationException: could not execute statement 
    at org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:59) 
    at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:42) 
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:111) 
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:97) 
    at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:207) 
    at org.hibernate.engine.jdbc.batch.internal.NonBatchingBatch.addToBatch(NonBatchingBatch.java:45) 
    at org.hibernate.persister.collection.AbstractCollectionPersister.recreate(AbstractCollectionPersister.java:1313) 
    at org.hibernate.persister.collection.OneToManyPersister.recreate(OneToManyPersister.java:170) 
    at org.hibernate.action.internal.CollectionRecreateAction.execute(CollectionRecreateAction.java:50) 
    at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:560) 
    at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:434) 
    at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:337) 
    at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:39) 
    at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1295) 
    at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:468) 
    at org.hibernate.internal.SessionImpl.flushBeforeTransactionCompletion(SessionImpl.java:3135) 
    at org.hibernate.internal.SessionImpl.beforeTransactionCompletion(SessionImpl.java:2352) 
    at org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl.beforeTransactionCompletion(JdbcCoordinatorImpl.java:485) 
    at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.beforeCompletionCallback(JdbcResourceLocalTransactionCoordinatorImpl.java:147) 
    at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.access$100(JdbcResourceLocalTransactionCoordinatorImpl.java:38) 
    at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.commit(JdbcResourceLocalTransactionCoordinatorImpl.java:231) 
    at org.hibernate.engine.transaction.internal.TransactionImpl.commit(TransactionImpl.java:65) 
    at Dao.UserDao.testFriend(UserDao.java:208) 
    at Test.Main.main(Main.java:40) 
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '1' for key 'PRIMARY' 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) 
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) 
    at java.lang.reflect.Constructor.newInstance(Unknown Source) 
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:404) 
    at com.mysql.jdbc.Util.getInstance(Util.java:387) 
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:932) 
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3878) 
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3814) 
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2478) 
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2625) 
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2551) 
    at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1861) 
    at com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2073) 
    at com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2009) 
    at com.mysql.jdbc.PreparedStatement.executeLargeUpdate(PreparedStatement.java:5094) 
    at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1994) 
    at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:204) 
    ... 19 more 

私は私のMainclassで使用employee1.getColleagues().add(employee3);をdosn't場合。すべてが動作しており、HibernateはEMPLOYEEをMySQLデータベースにすべて保存します。 ちょうどemployee1.getColleagues().add(employee3);´ dosn't work and i don't know why. I think it's because the hbm.xml`です。しかし、私は分からない、私は何を変更する必要があります

私のデータベース内のテーブルEMPLOYEEです。

Answer 1

従業員3が同僚リストに追加されたときに、注釈によってemployee3が保存されているようです。その後、session.save(employee3);を呼び出すと再び保存され、同じIDが主キー制約を無効にします。したがって、同僚リストに追加する前にまず保存するか、リストに追加した後にもう一度保存しないでください。次のようなものがあります。

employee3 = session.save(employee3); 
employee1.getColleagues().add(employee3);