Hi all,

I am attempting to create a class that has a property of type Object. So, I'm using a property tag with type="object", as stated in the reference, p. 58 under possible typenames. Yet when I deploy the mapping file, I get the error:

org.hibernate.MappingException: property mapping has wrong number of columns: com.simunex.snx.core.types.Attribute.value type: object

from the mapping file:

<property name="value" type="object"/>

It's probably something downright obvious, but I'm at a loss. If I change the type to anything but "object" (like serializable), it's fine.

Insight, please? Thanks!

--Scott

Can you post the rest of the mapping file?

How exactly do you expect the object to be stored in your DB? What DB are you using?

The point of serializable is that the object can be serialized for storage.

<?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 package="com.simunex.snx.core.types">
<class name="Attribute">
<id name="id">
<generator class="native"/>
</id>
<many-to-one name="type" column="typeId" class="AttributeType"/>
<property name="value" type="object"/>
</class>
</hibernate-mapping>

AttributeType (in case you need it):

<?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 package="com.simunex.snx.core.types">
<class name="AttributeType">
<id name="id">
<generator class="native"/>
</id>
<property name="dataType" type="class"/>
<property name="name" type="string"/>
</class>
</hibernate-mapping>

jamie:

MySQL 4.1, and I know what the point of serializable is. The point is that the docs say that property type of "object" is valid, yet it isn't currently. Then what is the point of having type "object" if, in reality, "serializable" is supposed to mean a generic object (in the Java type sense). Maybe there is a real "object" datatype in some DBs (Oracle?), I forget. If so, there should be a better clarification of the available types.

Thanks!

--Scott