Problem in mapping

[Siddharth Bhargava]

I am trying out one-to-one mapping with a join table. Following is the code :
userjoin.hbm.xml

  
<?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="com.hibernateexample.jointable.Users" table="JOIN_USERS">

<id name="usersId" type="long" column="USERS_ID">
<generator class="native"/>
</id>

<property name="firstname">
<column name="FIRSTNAME"/>
</property>

<property name="lastname">
<column name="LASTNAME"/>
</property>

<property name="username">
<column name="USERNAME"/>
</property>

<property name="password">
<column name="PASSWORD"/>
</property>

<property name="email">
<column name="EMAIL"/>
</property>

 
<join table="UserAddress" optional="true">
<key column="USERS_ID" unique="true" />
<many-to-one name="shippingAddress" 
class="com.hibernateexample.jointable.Address"
column="SHIPPING_ADDRESS_ID" 
cascade="save-update,delete"
unique="true"
not-null="true"/>
</join>

<!--
<many-to-one name="shippingAddress" 
class="com.hibernateexample.onetooneforeign.Address"
column="SHIPPING_ADDRESS_ID" 
cascade="save-update,delete"
unique="true"
not-null="true"/>
-->

</class>

</hibernate-mapping>
 

addressjoin.hbm.xml

  
<?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="com.hibernateexample.jointable.Address" table="JOIN_ADDRESS">

<id name="addressId" column="ADDRESS_ID">
<generator class="native"/>
</id>

<property name="street" column="STREET"/>
<property name="city" column="CITY"/>
<property name="zipcode" column="ZIPCODE"/>


<join table="UserAddress" optional="true" inverse="true">
<key column="ADDRESS_ID" unique="true" />
<many-to-one name="users" 
class="com.hibernateexample.jointable.Users"
column="SHIPPING_USERS_ID" 
unique="true"
not-null="true"/>
</join>
<!--
<one-to-one name="users" class="com.hibernateexample.onetooneforeign.Users"
property-ref="shippingAddress" />
-->
</class>
 
</hibernate-mapping>
 

I am getting the following exception :

Starting
log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
org.hibernate.exception.GenericJDBCException: could not insert: [com.hibernateexample.jointable.Users]
at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:103)
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:91)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2267)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2640)
at org.hibernate.action.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:48)
at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:250)
at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:298)
at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:181)
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:107)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:187)
at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:33)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:172)
at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:27)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:535)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:523)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:519)
at com.hibernateexample.jointable.MappingJoinTableApplication.main(MappingJoinTableApplication.java:52)
Caused by: java.sql.SQLException: Field 'shippingAddress' doesn't have a default value
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:946)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2985)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1631)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1723)
at com.mysql.jdbc.Connection.execSQL(Connection.java:3283)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1332)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1604)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1519)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1504)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2250)
... 15 more

Please Help !!!