Plane {
  "name" : "..."
  "max_alt" : "..."
}

Submarine {
  "name" : "..."
  "depth_max" : "..."
}

Vehicle       Value                   Attribute
-------  1:n  -----------------  n:1  ----------
ID (PK)       OBJECT_FK    (PK)       ID (PK)
              ATTRIBUTE_FK (PK)       NAME
              ATTRIBUTE_VALUE

@Entity
public class Vehicle{
   //obvious code ommited

   **Map<Attribute, Set<AttributeValue>> attributeValueMap;**
}