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POhibernate collection mapping with list and super entity class
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copied!<p>here i am again in my self learning hibernate and personal experiment project to gain more understanding. Here is the description of my environment: i have a super model entity that all my model inherit from.it has only id property i use the genericDAO pattern found on hibernate web site. Now my problem is that i use list instead of set for my one to many mapping (there is no need to avoid duplication here) and when i reference the super entity id in list index or list-index property i have this error : org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session here is the super entity interface </p> <pre><code>public interface Model extends Serializable { public Long getId(); public void setId(Long id); } //here is its implementation.they are not in the same physical file public abstract class ModelImpl implements Model { private Long id; public Long getId() { return id; } public void setId(Long id) { this.id = id; } </code></pre> <p>} </p> <p>here is it's mapping file</p> <pre><code><class abstract="true" name="ModelImpl">  <id name="id"> <generator class="assigned"/> </id> </class> </code></pre> <p>here is on pojo interface this is my parent </p> <pre><code>public interface Message extends Model { Date getDateSent(); String getGlobalStatus(); </code></pre> <p>} //its implementation is here but on different physical file public class MessageImpl extends ModelImpl implements Message{ private String globalStatus; private List response = new ArrayList(); private Date dateSent; //setters and getters.... }</p> <p>its mapping file is like so :</p> <pre><code><union-subclass extends="ModelImpl" name="MessageImpl"> <property name="globalStatus"/> <property name="dateSent" type="timestamp"/> </code></pre> <p> </set>--> </p> <p>i commented the set because its was given a casting error which makes me realize my error so the Response class which is the parent is here :</p> <pre><code>public interface Response extends Model { String getGatewayMessageId(); Message getMessageId(); } //its implementation but in different physical file public class ResponseImpl extends ModelImpl implements Response{ private static final long serialVersionUID = 1L; private Message messageId; private String gatewayMessageId; //setters and getters.. } </code></pre> <p>so that is basically that.now during my test when i try to save message with its children it throws this :</p> <blockquote> <p>org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session</p> </blockquote> <p>i can do all persitent methods exception the one i just talked about. i'm a bit lost here coz all of them are inheriting Model id so what am i doing wrong? thanks for reading.I dont' really understand the problem here.</p>

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