wrong mapping in postgre

[Ramon Cano Granizo]

Hello, i'm trying insert a blob record in postgreSQL, but every time i get an 
SQLException, UnknownType.

The repository_user.xml looks like

      <field-descriptor
          name="resource"
          column="resource"
          jdbc-type="BLOB"
       />

In the class, it's mapped like a byte[], 

perhaps i'm making a wrong mapping??

Anyone knows a better way?

Thanks