Java 5, ENUM and Hibernate

[Angela Stempfel]

hi all

i have some problems with the flexible enum solutiion described here:
http://hibernate.org/272.html
The following error occurs when calling the nullSafeGet method:

java.lang.IllegalArgumentException: object is not an instance of declaring class

my method looks like that:

public Object nullSafeGet(ResultSet rs, String[] names, Object owner)
         throws HibernateException, SQLException {
 
      Object identifier=type.get(rs, names[0]);
      try {
            return valueOfMethod.invoke(enumClass, new Object [] {identifier});
        }
        catch(Exception exception) {
            throw new HibernateException(
                    "Exception while invoking valueOfMethod of enumeration class: ", exception);
        }
   }

My Enum class:

public enum UnterrichtsDauerEnum implements Serializable {
   Unknown(0), GROESSER_GLEICH_60(1), GROESSER_GLEICH_90(2);
   int value;
 
   private UnterrichtsDauerEnum(int value) {
      this.value = value;
   }
 
   /**
    * @return
    */
   public int toInt() {
      return value;
   }
 
   /**
    * @param value
    * @return
    */
   public UnterrichtsDauerEnum fromInt(int value) {
      switch (value) {
         case 1:
            return GROESSER_GLEICH_60;
         case 2:
            return GROESSER_GLEICH_90;
         default:
            return Unknown;
      }
   }
}

And here the parts of my mapping file:

<typedef name="UnterrichtsDauerEnum" class="najsre7.dao.hibernate.userType.immutable.GenericEnumUserType">
         <param name="enumClass">najsre7.model.immutable.kurs.UnterrichtsDauerEnum</param>
         <param name="identifierMethod">toInt</param>
         <param name="valueOfMethod">fromInt</param>
    </typedef>
 
 <subclass name="najsre7.model.KursNutzergruppe1" discriminator-value="1">
         <property name="kursArt" type="najsre7.dao.hibernate.userType.immutable.kurs.KursArtUT">
               <meta attribute="use-in-tostring">true</meta>
               <meta attribute="use-in-equals">true</meta>
               <column name="SIPAR1" precision="5" scale="0" not-null="true" />
           </property>
           <property name="unterrichtsDauer" type="UnterrichtsDauerEnum">
               <meta attribute="use-in-tostring">true</meta>
               <meta attribute="use-in-equals">true</meta>
               <column name="SIPAR2" precision="5" scale="0" />
           </property>
           <property name="gruppenGroesse" type="najsre7.dao.hibernate.userType.immutable.kurs.GruppenGroesseUT">
               <meta attribute="use-in-tostring">true</meta>
               <meta attribute="use-in-equals">true</meta>
               <column name="SIPAR3" precision="5" scale="0" not-null="true" />
           </property>
 
//more

Some help appreciated! Other solutions with UserTypes and ENUM's are welcome as well.

Kind Regards
Angela
[ August 30, 2006: Message edited by: Angela Stempfel ]

[Angela Stempfel]

i finally found the solution! the method fromInt must be defined as static!

angela