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Forum locked This topic is locked, you cannot edit posts or make further replies.  [ 1 post ] 
Author Message
 Post subject: Flex + Java + Hibernate
PostPosted: Tue May 26, 2009 9:07 am 
Newbie

Joined: Thu Nov 20, 2008 6:41 am
Posts: 3
Hi All,

I am facing a peculiar problem while saving the data. Below is the detailed explanation what I am doing. I always get the problem as "a different object with the same identifier value was already associated with the session"

But the above error does not come when I try to save the same object from java.

Below is the Parent Class in java
Code:
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

/**
* Employee entity. @author MyEclipse Persistence Tools
*/

public class Employee implements java.io.Serializable {

   private Integer employeeId;
   private String name;
   private List communicationTypes = new ArrayList();

// getters and setters follows


Below is the Parent class in Flex
Code:
package manageCustomList.employee
{
   import mx.collections.ArrayCollection;
   
   [Bindable]
   [RemoteClass(alias="com.config.Employee")]
   public class Employee
   {
      public function Employee()
      {
      }

      public var employeeId:int;
      
      public var name:String;

      public var communicationTypes:Array;
   }
}


Below is the Child Class in java
Code:
public class CommunicationType extends Employee implements java.io.Serializable {
   private Integer comTypeId;
   private Integer typeId;
   private String typeName;
// getters and setters follows
}


Below is the child Class in Flex
Code:
package manageCustomList.employee
{
   import mx.controls.List;
   
   [Bindable]
   [RemoteClass(alias="com.config.CommunicationType")]
   public class CommunicationType extends Employee
   {
      public function CommunicationType()
      {
      }

      public var comTypeId:int;

      public var typeId:int;

      public var typeName:String;

   }
}


Below is the method to save the object in the database
Code:
public static Employee create(Employee employee) throws DAOException
   {
      Session session = HibernateSessionFactory.getSession();
      try
      {
         session.beginTransaction();
         session.save(employee);
         session.getTransaction().commit();
         session.flush();
         session.evict(employee);
      }
       catch (HibernateException exp) {
          exp.printStackTrace();
      } finally {
         session.close();
      }
      return employee;
   }


Below is my mxml
Code:
private function save():void {
   employee = new Employee();

   employee.listId = Number(listId.text);
   employee.name = empName.text;

   var childList:Array = new Array();

   for(var i:int=0;i<checkList.selectedIndices.length;i++){
      comType = new CommunicationType();
      comType.typeId = checkList.selectedIndices[i];
      comType.typeName = checkList.dataProvider[checkList.selectedIndices[i]].label;
      childList.push(comType);
   }

   employee.communicationTypes = childList;

   emp.create(employee);
}


when I do the above i get the error as "a different object with the same identifier value was already associated with the session"

But when I try to save the employee from java as below. It gets saved without any problem.
Code:
public static void main(String[] args) {
   Employee emp = new Employee();
   emp.setName("fresh from java only 2");

   CommunicationType comType = new CommunicationType();
   comType.setTypeId(1);
   comType.setTypeName("typeName");

   List comSet = new ArrayList();
   comSet.add(comType);

   emp.setCommunicationTypes(comSet);
   create(emp);
}


below are my hbm files
Employee.hbm.xml
Code:
<hibernate-mapping>
    <class name="com.config.Employee" table="EMPLOYEE" schema="DISLIST">
        <id name="employeeId" type="java.lang.Integer" unsaved-value="-1">
            <column name="EMPLOYEE_ID" />
            <generator class="identity" />
        </id>
      <property name="listId" type="java.lang.Integer">
            <column name="LIST_ID" length="4" />
        </property>       
        <property name="name" type="java.lang.String">
            <column name="EMP_NAME" length="50" not-null="true" />
        </property>
        <bag name="communicationTypes" cascade="all" lazy="false">
      <key column="EMPLOYEE_ID"/>
      <one-to-many class="com.ibm.dlm.config.CommunicationType"/>
   </bag>
    </class>
</hibernate-mapping>



CommunicationType.hbm.xml
Code:
<hibernate-mapping>
    <class name="com.config.CommunicationType" table="COMMUNICATION_TYPE" schema="DISLIST">
        <id name="comTypeId" type="java.lang.Integer" unsaved-value="-1" >
            <column name="COM_TYPE_ID" />
            <generator class="identity" />
        </id>
        <property name="typeId" type="java.lang.Integer">
            <column name="TYPE_ID" not-null="true" />
        </property>
        <property name="typeName" type="java.lang.String">
            <column name="TYPE_NAME" length="40" not-null="true" />
        </property>
    </class>
</hibernate-mapping>


Let me know if you any refernce of other things.

Any help would be really helpful

Thanks in advance


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