Thanks for this, it’s been very useful. However, MultiMap.putAll doesn’t work with the above code (it uses the existing PersistentMap.putAll that puts the value collections into the MultiMap rather than each key, value pair). The following works for me if added to PersistentMultiMap:

/**
* @see java.util.Map#putAll(java.util.Map puts)
*/
@Override
public void putAll(Map puts) {
if ( puts.size()>0 ) {
initialize( true );
Iterator itr = puts.entrySet().iterator();
while ( itr.hasNext() ) {
Map.Entry entry = ( Entry ) itr.next();
Collection collection = (Collection) entry.getValue();
for( Object value : collection) {
put( entry.getKey(), value );
}
}
}
}

<class>
….
<map name=”acl” table=”GROUP_OBJECTS” cascade=”save-update,delete” collection-type=”MultiMapType”>
<key column=”GROUPID” />
<map-key column=”OBJECTTYPEID” type=”objectType”/>
<one-to-many class=”AclObject” />
</map>
</class>

<class name=”AclObject” table=”GROUP_OBJECTS” lazy=”false”>

<id name=”id” column=”ID” type=”java.lang.Integer”>
<generator class=”increment”/>
</id>

<property name=”groupId” column=”USERGROUPID” type=”java.lang.Integer” not-null=”true”/>

<property name=”objectType” column=”OBJECTTYPEID” type=”objectType” not-null=”true”/>

<property name=”objectId” column=”OBJECTID” type=”java.lang.String” not-null=”true”/>

</class>

I tried the Map of Sets solution.
See below for the mapping. In spite of cascade option set the AclObject is not geting saved and
i get the following errors
“object references an unsaved transient instance – save the transient instance before flushing”

Any pointers would be of great help

Thanks

….

You say that Map<string, list> cannot be handled, but then you prove that it can be. After all a list can be considered TreeMap This is actually better in hibernate than a regular list because:

* sparse lists are now possible
* the element indicies as storied in the db can have gaps to allow inserting new elements without renumbering all elements.

Regards,

Maarten Winkels

Yes,

It will be very nice if you could attach the source files of this enhancement !

Thanks
Nicolas

This sounds like a great enhancement, however I can’t find the sources for the classes that you say are attachments to this blog.

Thanks,
Nicko