ClassCastException on session.get or session.load with BigInteger as primary key -------------------------------------------------------------------------------- Key: HHH-1094 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1094 Project: Hibernate Core Issue Type: Bug Components: core Affects Versions: 3.1 rc2 Environment: Tomcat 5.5.4 on Windows XP Professional Oracle 9.2.0.6.0 64bit on Solaris Java 1.5.0_05 Hibernate 3.1rc2 Reporter: Dirk Weigenand The following code public static Produkt findProduktById( String produktId ) { Session session = HibernateUtil.currentSession(); log.info( "produktId: " + produktId ); Produkt produkt = (Produkt)session.get( Produkt.class, new BigInteger( produktId ) ); HibernateUtil.closeSession(); return produkt; } yields following exeption when executed: java.lang.ClassCastException: java.math.BigInteger org.hibernate.type.BigDecimalType.getHashCode(BigDecimalType.java:48) org.hibernate.type.AbstractType.getHashCode(AbstractType.java:120) org.hibernate.engine.EntityKey.getHashCode(EntityKey.java:68) org.hibernate.engine.EntityKey.<init>(EntityKey.java:41) org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:76) org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:809) org.hibernate.impl.SessionImpl.get(SessionImpl.java:749) org.hibernate.impl.SessionImpl.get(SessionImpl.java:742) de.gisa.orderit.beans.ProduktFinder.findProduktById(ProduktFinder.java:71) The class is mapped as follows: <class name="de.gisa.orderit.beans.Produkt" table="ORD_PRODUKTE" schema="ORDERITT"> <id name="idProdPk" type="big_decimal"> <column name="ID_PROD_PK" precision="22" scale="0" /> <generator class="assigned" /> </id> <many-to-one name="Produktkategorien" class="de.gisa.orderit.beans.Produktkategorie" fetch="select"> <column name="ID_KAT_FK" precision="22" scale="0" not-null="true" /> </many-to-one> <many-to-one name="Formular" class="de.gisa.orderit.beans.Formular" fetch="select"> <column name="ID_FRM_FK" precision="22" scale="0" /> </many-to-one> <many-to-one name="Mandant" class="de.gisa.orderit.beans.Mandant" fetch="select"> <column name="ID_MDT_FK" precision="22" scale="0" not-null="true" /> </many-to-one> <many-to-one name="User" class="de.gisa.orderit.beans.User" fetch="select"> <column name="ID_USER_AV_FK" precision="22" scale="0" not-null="true" /> </many-to-one> <many-to-one name="Produkttyp" class="de.gisa.orderit.beans.Produkttyp" fetch="select"> <column name="ID_PTY_FK" precision="22" scale="0" not-null="true" /> </many-to-one> <property name="name" type="string"> <column name="NAME" length="100" not-null="true" /> </property> <property name="beschreibung" type="string"> <column name="BESCHREIBUNG" length="1000" /> </property> <property name="plb" type="string"> <column name="PLB" length="10" /> </property> <property name="prodAktiv" type="character"> <column name="PROD_AKTIV" length="1" not-null="true" /> </property> <set name="Bestellungs" inverse="true"> <key> <column name="ID_PROD_FK" precision="22" scale="0" not-null="true" /> </key> <one-to-many class="de.gisa.orderit.beans.Bestellung" /> </set> </class> Thanks. Dirk