Hibernate Error:different object with the same identifier value was already associated with session

[Murali Sridhar]

Hello,

We tried to simulate the hibernate error in DEV and QA environments, but no luck. If I didn't re-produce the problem in DEV and QA, there is no point of 'fix' in production.

Here is the error message: ERROR webServiceMessageCall - "nested exception is org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session:"

I found some fixes by googling, but these are not helpful in re-producing the Hibernate error in DEV/QA environment.

Here is the simple hbm file:

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 2.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.comp.AccRelation" table="Acc_Relation">
<composite-id name="primaryKeyId" class="com.comp.AccKey**">
<key-property name="id"/>
<key-property name="name" column="Name" type="java.lang.String"/>
<key-property name="accKey" column="acc_key" type="java.lang.String"/>
</composite-id>
<property name="date" column="Date" type="java.util.Date"/>
</class>
</hibernate-mapping>

** The AccKey is a simple bean.
Java code causing error:

protected void batchExe(List insertObj)throws Exception{
try {
for (Object inObj: insertObj) {
getHibernateTemplate().save(inObj);
//here: causing the Hibernate Error
}
if (log.isDebugEnabled()) {
log.debug("Insert Successful.");
}
} catch (DataAccessException ex) {
log.error("Data access error");
}

} 

Much appreciate your help in re-generating this problem in DEV.

[Paul Sturrock]

It looks like your list of objects contains two entries that equate to the same thing. Can you post your key implementation code?