I try to mape parent - child relation using llist.
In parent class I have ArrayList object holding children

I got this error...

13:39:11,036 ERROR BasicPropertyAccessor:62 - IllegalArgumentException in class: data.object.pdbCode, setter method of property: pdbfiles
13:39:11,036 ERROR BasicPropertyAccessor:66 - expected type: java.util.ArrayList, actual value: org.hibernate.collection.PersistentList

Both getter and setter for in parent class operate obviosly on ArrayList why this is a problem?

My mapping on parent side looks like:

<list name="pdbfiles"
lazy="true"
inverse="true"
cascade="all-delete-orphan">

<key column="parent_id" not-null="true"/>
<list-index column="number"/>
<one-to-many class="pdbFile"/>
</list>


and on children side:

<many-to-one name="parent_id"
class="pdbCode"
column="parent_id"
not-null="true" />

Any suggestions ?


Sincerely,

Pawel

Do not have your setter method taking ArrayList, have it use the interface List instead so that a persisted list can be used as well.

Thanks,




private void setSmt(List p) {
this.Smt = (ArrayList) p;
}

You don't actually even need that cast, and really you shouldn't use it.

Define your property using the Interface leaving you free to choose the implementation and alter it if necessary.