get error in Martin Kersten's flexible EnumUserType solution

brotherlam · **Joined:** Tue Aug 01, 2006 1:24 pm **Posts:** 1

I'm able to save my enum type via nullSafeSet but when I load via the

Code:

nullSafeGet

of Martin Kersten's flexible EnumUserType
I got the:

Quote:

object is not an instance of declaring class without

error

This happened even before my own "valueOf" method is getting called.
Can't even step into the invoke method to debug.
Can someone help why this error is coming up?

angela · **Posted:** Tue Aug 29, 2006 10:15 am

hello

i have the same problem! always getting the error:

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

did you find a solutions??

my method looks like that:

Code:

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:

Code:

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:

Code:

<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

angela

angela · **Posted:** Tue Aug 29, 2006 10:18 am

hello

i have the same problem! always getting the error:

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

did you find a solutions??

my method looks like that:

Code:

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:

Code:

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:

Code:

<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

angela

marw · **Posted:** Wed Sep 13, 2006 10:59 am

@brotherlam:
Try to declare your valuOfMethod as static like this:

Code:

public [color=darkred]static [/color]UnterrichtsDauerEnum fromInt(int value) {