How to query a value typed object

[Stanley Walker]

I am trying to learn hibernate and I came across this little problem en route. Any help will be appreciated.

I have created a entity and a value typed object.

My entity is of type Person which is mapped to value object of Address.
The mapping is given below:

<?xml version="1.0"?> 
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN" 
 "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
	<class name="entityobject.Person" table="Person" schema="dev_mds">
		<composite-id name="keyId" class="entityobject.key.PersonKey">
			<key-property name="ssnNumber" column="ssn_number" type="string" />
			<key-property name="personId" column="person_id" type="string" />
		</composite-id>
		<property name="name" column="person_name" type="string" />
		<property name="age" column="person_age" type="float" />
		<set name="address" table="address" schema="dev_mds">
			<key>
				<column name="ssn_number" />
				<column name="person_id" />
			</key>
			<composite-element class="valueobject.Address">
				<parent name="user" />
				<property name="address" type="string" column="address" />
			</composite-element>

		</set>

	</class>
</hibernate-mapping>

My question is can i query from a value typed object? When i query directly from the entity i get the details of the address value object too.
However what if a use case arises where i need to directly query from value object how would i do that.

I tried the below query

 <query name="getFromAddress"><![CDATA[from valueobject.Address as a where
		a.address =:address
	 ]]></query>

However on executing the query from code using the below code:

Query q = hibernateSession.getNamedQuery("getFromAddress");
q.setString("address", "myaddress2");
List<Address> result = q.list();

I get an exception which says:

Exception in thread "main" java.lang.IllegalArgumentException: Parameter address does not exist as a
named parameter in [from valueobject.Address as a where
a.address =:address
]
at org.hibernate.impl.AbstractQueryImpl.setParameter(AbstractQueryImpl.java:356)
at org.hibernate.impl.AbstractQueryImpl.setString(AbstractQueryImpl.java:643)
at hibernatetrial.run.RunApplication.main(RunApplication.java:43)


Please help.