I'm learning Hibernate (using v 3.0.5) and am trying to implement a UserType as an example.

My understanding is that:

1) I first write my custom type "class MyNewClass"
2) I then write a "class MyNewClassType implements UserType"
3) Finally, I map properties using this "wrapper" type, like:
<property name="someField" type="MyNewClassType"/>

I've done this, but after I run hbm2java to generate code from my SomeClass.hbm.xml, the generated class declares "someField" as being of type "MyNewClassType". I was expecting something like:

public class SomeClass {
MyNewClass someField;
//...
}

I'm assuming that I am missing some type of declaration in the mapping file which maps MyNewClassType as a wrapper for MyNewClass?

<meta attribute="property-type">MyNewClass</meta>

now I am looking up how I can rate this answer as useful! :-)

The problem has been solved in CVS, so later you don't need to define a meta attribute anymore

for anything to work the usertype must be on the classpath