Hello,

I'm new with Hibernate. Thats why I have the following question:

Is it realy neccessary to have a key-class for an composit-key. If I don't take one, I get an Exception: Composite key has to be serializable. But my composite-key contains two Long and one String. That should be serializable.
What am I wrong?
Mapping and Class are appended.

Thanks.

bye bye
zone3





Hibernate version: 2.1.7

Name and version of the database you are using: Oracle 9i

Mapping documents:


<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 2.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd" >

<hibernate-mapping>


<class
name="com.telekom.fast.data.mapping.UserRight"
table="UD_TB_RIGHT"
>

<composite-id>
<!--rtUrLoginPkFk"-->
<key-property
name="login"
column="RT_UR_LOGIN_PK_FK"
type="java.lang.String"
/>

<!--SystemPriveledge"-->
<key-property
name="privilegId"
column="RT_SP_ID_PK_FK"
type="java.lang.Long"
/>

<!--DateFrom"-->
<key-property
name="number"
column="RT_UT_NUMBER"
type="java.lang.Long"
/>

</composite-id>

<!--Dateuntil"-->
<property
name="dateFrom"
column="RT_DATE_FROM"
type="java.lang.Long"
length="10"
/>

<!--unitNumber"-->
<property
name="dateUntil"
column="RT_DATE_UNTIL"
type="java.lang.Long"
length="10"
/>

<!-- Associations -->

<many-to-one
name="user"
class="com.telekom.fast.data.mapping.User"
column="RT_UR_LOGIN_PK_FK"
update="false"
insert="false">
</many-to-one>

<many-to-one
name="systemPrivileg"
class="com.telekom.fast.data.mapping.SystemPrivileg"
column="RT_SP_ID_PK_FK"
update="false"
insert="false">
</many-to-one>

<many-to-one
name="unit"
class="com.telekom.fast.data.mapping.Unit"
column="RT_UT_NUMBER"
update="false"
insert="false">
</many-to-one>


<!-- end of associations -->

</class>
</hibernate-mapping>

-------------------------------------------------------------------------------

public class UserRight {

private String login = null;

private Long privilegId = null;

private Long number = null;

private Long dateFrom = null;

private Long dateUntil = null;

private User user = null;

private Unit unit = null;

private SystemPrivileg systemPrivileg = null;

/**
* default constructor
*/
public UserRight(){

}

/**
* Constructs a new UserRight with only mandatory (non-nullable) parameters
* @param user the udTbUser value
* @param unit the adTbFormhUt value
* @param systemPrivileg the udTbSystemPrivileg value
*/
public UserRight(User user, Unit unit, SystemPrivileg systemPrivileg) {
setUser(user);
setUnit(unit);
setSystemPrivileg(systemPrivileg);
}



/**
* Returns the related UdTbUser
*
* @return the related UdTbUser
*/
public User getUser() {
return user;
}

/**
* Sets the related UdTbUser
*
* @param user the related udTbUser
*/
public void setUser(User user) {
this.user = user;
}


public Unit getUnit() {
return unit;
}

public void setUnit(Unit unit) {
this.unit = unit;
}

/**
* Returns the related SystemPrivileg
*
* @return the related SystemPrivileg
*/
public SystemPrivileg getSystemPriveleg() {
return systemPrivileg;
}

/**
* Sets the related SystemPriveleg
*
* @param systemPrivileg the related udTbSystemPrivileg
*/
public void setSystemPrivileg(SystemPrivileg systemPrivileg) {
this.systemPrivileg = systemPrivileg;
}

public String getLogin() {
return login;
}

public void setLogin(String login) {
this.login = login;
}

public Long getPrivilegId() {
return privilegId;
}

public void setPrivilegId(Long privilegId) {
this.privilegId = privilegId;
}

public Long getNumber() {
return number;
}

public void setNumber(Long number) {
this.number = number;
}

public Long getDateFrom() {
return dateFrom;
}

public void setDateFrom(Long dateFrom) {
this.dateFrom = dateFrom;
}

public Long getDateUntil() {
return dateUntil;
}

public void setDateUntil(Long dateUntil) {
this.dateUntil = dateUntil;
}

public boolean equals(Object o) {
if (this == o) return true;
if (!(o instanceof UserRight)) return false;

final UserRight userRight = (UserRight) o;

if (!login.equals(userRight.login)) return false;
if (!number.equals(userRight.number)) return false;
if (!privilegId.equals(userRight.privilegId)) return false;

return true;
}

public int hashCode() {
int result;
result = login.hashCode();
result = 29 * result + privilegId.hashCode();
result = 29 * result + number.hashCode();
return result;
}
}

UserRight has to be serializable, it is its own PK class