<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>

<class name="importer.Contact" table="CMS_CONTACT">
<id name="con_id" column="con_id">
<generator class="native"/>
</id>
<property name="firstname" />
<property name="lastname"/>
<property name="street" />
<property name="city" />
<property name="owner_metauser_id" />
<property name="homepage" />
<property name="username" />
<property name="hsn" column="hsn" type="java.lang.Integer" />
</class>

</hibernate-mapping>


This works fine when hsn is set with a value but when I try to set hsn to null I get the following error:

[java] Exception in thread "main" java.lang.ClassCastException: java.lang.String
[java] at org.hibernate.type.IntegerType.set(IntegerType.java:41)
[java] at org.hibernate.type.NullableType.nullSafeSet(NullableType.java:136)
[java] at org.hibernate.type.NullableType.nullSafeSet(NullableType.java:107)
[java] at org.hibernate.persister.entity.AbstractEntityPersister.dehydrate(AbstractEntityPersister.java:1997)
[java] at org.hibernate.persister.entity.AbstractEntityPersister.dehydrate(AbstractEntityPersister.java:1974)
[java] at org.hibernate.persister.entity.AbstractEntityPersister$3.bindValues(AbstractEntityPersister.java:2152)
[java] at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:32)
[java] at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2158)
[java] at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2638)
[java] at org.hibernate.action.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:48)
[java] at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:250)
[java] at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:298)
[java] at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:181)
[java] at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:107)
[java] at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:187)
[java] at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:33)
[java] at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:172)
[java] at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:27)
[java] at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
[java] at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:535)
[java] at org.hibernate.impl.SessionImpl.save(SessionImpl.java:523)
[java] at org.hibernate.impl.SessionImpl.save(SessionImpl.java:519)
[java] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[java] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
[java] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
[java] at java.lang.reflect.Method.invoke(Method.java:585)
[java] at org.hibernate.context.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:301)
[java] at $Proxy0.save(Unknown Source)
[java] at importer.DbInsert.StoreContact(Unknown Source)
[java] at importer.DbInsert.storeContactList(Unknown Source)
[java] at importer.DbInsert.main(Unknown Source)
[java] Java Result: 1


Any idea what I'm doing wrong?

Are your getter and setter methods for hsn of Integer type?

Yes, they are of Integers type:

public class Contact {

...
private Integer hsn;
...



public Integer getHsn() {
return hsn;
}
public void setHsn(Integer hsn){
this.hsn=hsn;
}

}

I don't think hsn is the problem. You're getting an exception because a string value is being cast to an integer type. So whatever property is causing the problem _isn't_ set to null when you save the object.

Can you post the rest of your Contact class.