public class OccupationSol implements java.io.Serializable {
       private MultiPolygon gpoly;

       @Column(name = "gpoly", columnDefinition="GEOMETRY" )
   @Type(type="org.hibernatespatial.GeometryUserType")
   
   public MultiPolygon getGpoly() {
      return gpoly;
   }

   public void setGpoly(MultiPolygon gpoly) {
      
      this.gpoly = gpoly;
   }

}

<property name="hibernate.dialect" value="org.hibernatespatial.postgis.PostgisDialect"/>
         <property name="hibernate.hbm2ddl.auto" value="validate"/>
         <property name="hibernate.show_sql" value="true"/>
         <property name="hibernate.format_sql" value="true"/>
         <property name="hibernate.transaction.manager_lookup_class" value="org.hibernate.transaction.JBossTransactionManagerLookup"/>

08:50:33,984 ERROR [[/Sigpn]] Exception lors de l'envoi de l'évènement contexte initialisé (context initialized) à l'instance de classe d'écoute (listener) org.jboss.seam.servlet.SeamListener
org.jboss.seam.InstantiationException: Could not instantiate Seam component: SigpnEntityManagerFactory
   at org.jboss.seam.Component.newInstance(Component.java:1986)
   at org.jboss.seam.contexts.Contexts.startup(Contexts.java:304)
   at org.jboss.seam.contexts.Contexts.startup(Contexts.java:278)
   at org.jboss.seam.contexts.ServletLifecycle.endInitialization(ServletLifecycle.java:95)
   at org.jboss.seam.init.Initialization.init(Initialization.java:596)
...................
Caused by: org.hibernate.MappingException: Could not determine type for: org.hibernatespatial.postgis.PGGeometryUserType, for columns: [org.hibernate.mapping.Column(gpoly)]
   at org.hibernate.mapping.SimpleValue.getType(SimpleValue.java:266)
   at org.hibernate.mapping.SimpleValue.isValid(SimpleValue.java:253)
   at org.hibernate.mapping.Property.isValid(Property.java:185)
   at org.hibernate.mapping.PersistentClass.validate(PersistentClass.java:440)