All, I am having a headache with this error:

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java.lang.ClassCastException
at net.sf.hibernate.type.SetType.wrap(SetType.java:24)
at net.sf.hibernate.impl.WrapVisitor.processArrayOrNewCollection(WrapVisitor.java:78)
at net.sf.hibernate.impl.WrapVisitor.processCollection(WrapVisitor.java:49)
at net.sf.hibernate.impl.AbstractVisitor.processValue(AbstractVisitor.java:69)
at net.sf.hibernate.impl.WrapVisitor.processValues(WrapVisitor.java:93)
at net.sf.hibernate.impl.SessionImpl.doSave(SessionImpl.java:913)
at net.sf.hibernate.impl.SessionImpl.doSave(SessionImpl.java:850)
at net.sf.hibernate.impl.SessionImpl.saveWithGeneratedIdentifier(SessionImpl.java:772)
at net.sf.hibernate.impl.SessionImpl.save(SessionImpl.java:731)
---------------------------------------------------------------

Can someone give me a light?

I have a Screen.java file which contains:
String id;
String termid;
LinkedHashMap plans;

and its corresponding setters/getters.
The LinkedHashMap is populated with Plan(s).java, and a Plan.java contains:
String mealPlan;
String blackBoard;

Here is the mapping file:

Any help?

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

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

<hibernate-mapping schema="web001" package="edu.udel.dining">

<class name="edu.udel.dining.beans.Screen" table="dining_screenbean">
<id name="id">
<generator class="uuid.hex"/>
</id>
<property name="termid" type="char">
<column name="termid" length="3" unique-key="true" not-null="true" />
</property>
<set name="plans" lazy="true">
<key column="termid" />
<one-to-many class="edu.udel.dining.beans.Plan" />
</set>
</class>

<class name="edu.udel.dining.beans.Plan" table="dining_planbean">
<id name="id">
<generator class="uuid.hex"/>
</id>
<property name="mealPlan" type="string"/>
<property name="blackBoard" type="string"/>
</class>

</hibernate-mapping>

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

Is you class serialisable?

Yes, both of them. The Screen.java and Plan.java implement java.io.serializable

You are mapping a LinkedHashMap with a Set mapping. This doesn't work, only use collection interface types in your Java classes, such as List or Set (best practice anyway).

Hi, thanks for the reply, but I don't think this is the problem. Just to make sure, I went ahead and modifed my code to use Map instead of LinkedHashMap, and exactly the same error occurred.

Any more thoughts? Any one?

Thanks,
Luis

You can't map a Map with a <set>, use a <map>.

Actually, I am very sorry! I just used HashSet and it works.... I am now getting a different exception.....

=================================
2004-04-28 21:33:32,879: ERROR () - EXCEPTION: net.sf.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: edu.udel.hibernate.Plan
net.sf.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: edu.udel.hibernate.Plan
at net.sf.hibernate.impl.SessionImpl.throwTransientObjectException(SessionImpl.java:2759)
at net.sf.hibernate.impl.SessionImpl.getEntityIdentifierIfNotUnsaved(SessionImpl.java:2751)
at net.sf.hibernate.type.EntityType.getIdentifier(EntityType.java:66)
at net.sf.hibernate.type.ManyToOneType.nullSafeSet(ManyToOneType.java:46)
at net.sf.hibernate.collection.AbstractCollectionPersister.writeElement(AbstractCollectionPersister.java:384)
=====================================

I will play around to figure this one out. Thanks a BUNCH again, cool!

Luis

Thanks to you all.... Eveything works GREAT!!!!!

Luis