Hi,

does anybody knows, what the reason for this is:
Caused by: java.lang.ClassCastException: org.apache.openjpa.util.Id 
incompatible with org.apache.openjpa.util.IntId
        at 
com.mycompany.myproduct.ejb.entities.EntitySuperclass.pcCopyKeyFieldsFromObjectId(EntitySuperclass.java)
        at 
com.mycompany.myproduct.ejb.entities.EntityClass.pcNewInstance(EntityClass.java)
        at 
org.apache.openjpa.enhance.PCRegistry.newInstance(PCRegistry.java:121)
        at 
org.apache.openjpa.kernel.StateManagerImpl.initialize(StateManagerImpl.java:253)
        at 
org.apache.openjpa.jdbc.kernel.JDBCStoreManager.initializeState(JDBCStoreManager.java:330)
        at 
org.apache.openjpa.jdbc.kernel.JDBCStoreManager.initialize(JDBCStoreManager.java:255)
        at 
org.apache.openjpa.kernel.DelegatingStoreManager.initialize(DelegatingStoreManager.java:111)
        at 
org.apache.openjpa.kernel.ROPStoreManager.initialize(ROPStoreManager.java:57)
        at 
org.apache.openjpa.kernel.BrokerImpl.initialize(BrokerImpl.java:844)
        at org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:802)
        ... 99 more
(full exception dump below)

The requested JP query (see also stacktrace below) is "select o from User 
o where o.userName = ?1 and o.password = ?2". You find the entity class 
User below.

I'm using WebSphere 6.1.0.19 with OpenJPA as EJB3 provider.

best regards and thanks in advance
   Stepahn Koops

-------------------------------< entity class user 
>----------------------------------------
package com.mycompany.myproduct.ejb.entities;

import ...

@Entity
@Table(schema = "myproduct", name = "benutzer", uniqueConstraints = 
[EMAIL PROTECTED](columnNames = {"benutzername"})})
public class User implements Persistent {

        private static final long serialVersionUID = 
-6505202942252735251L;

        @Id
        @GeneratedValue
        private Long id;

        @OneToOne(cascade = { CascadeType.PERSIST, CascadeType.MERGE }, 
fetch = FetchType.EAGER)
        @JoinColumn(nullable = false)
        private Mitarbeiter mitarbeiter;

        @Column(name = "benutzername", nullable = false)
        private String userName;

        @Column(name = "passwort", nullable = false)
        private String password;

        @ManyToMany(cascade = { CascadeType.PERSIST, CascadeType.MERGE }, 
fetch = FetchType.EAGER)
        private Set<Role> roles = new HashSet<Role>();

        public User() {}

        /**
         * @param mitarbeiter
         * @param userName
         * @param password
         */
        public User(Mitarbeiter mitarbeiter, String userName, String 
password) {
                super();
                this.mitarbeiter = mitarbeiter;
                this.userName = userName;
                this.password = password;
        }

        /**
         * @param mitarbeiter
         * @param userName
         * @param password
         * @param roles
         */
        public User(Mitarbeiter mitarbeiter, String userName, String 
password, Role... roles) {
                super();
                this.mitarbeiter = mitarbeiter;
                this.userName = userName;
                this.password = password;
                for(Role role : roles) {
                        this.roles.add(role);
                }
        }

        /**
         * @return the id
         */
        public Long getId() {
                return id;
        }
        /**
         * @param id the id to set
         */
        public void setId(Long id) {
                this.id = id;
        }

        /**
         * @return the mitarbeiter
         */
        public Mitarbeiter getMitarbeiter() {
                return mitarbeiter;
        }

        /**
         * @param mitarbeiter the mitarbeiter to set
         */
        public void setMitarbeiter(Mitarbeiter mitarbeiter) {
                this.mitarbeiter = mitarbeiter;
        }

        /**
         * @return the password
         */
        public String getPassword() {
                return password;
        }

        /**
         * @param password the password to set
         */
        public void setPassword(String password) {
                this.password = password;
        }

        /**
         * @return the roles
         */
        public Set<Role> getRoles() {
                return roles;
        }

        /**
         * @param roles the roles to set
         */
        public void setRoles(Set<Role> roles) {
                this.roles = roles;
        }

        /**
         * @return the userName
         */
        public String getUserName() {
                return userName;
        }

        /**
         * @param userName the userName to set
         */
        public void setUserName(String userName) {
                this.userName = userName;
        }
 
        public boolean equals(Object otherO) {
                if(!(otherO instanceof User))
                        return false;
                return Util.equals(this.getId(), ((User)otherO).getId());
        }
}

-----------------------------< end of entity class User 
>----------------------------------




-------------------------< full log dump by WebSphere 
>----------------------

------Start of DE processing------ = [29.09.08 18:46:11:453 CEST] , key = 
org.apache.openjpa.persistence.PersistenceException 
com.ibm.ejs.container.BusinessExceptionMappingStrategy.setUncheckedException 
506
Exception = org.apache.openjpa.persistence.PersistenceException
Source = 
com.ibm.ejs.container.BusinessExceptionMappingStrategy.setUncheckedException
probeid = 506
Stack Dump = <openjpa-1.0.3-SNAPSHOT-r420667:649224 nonfatal general 
error> org.apache.openjpa.persistence.PersistenceException: 
org.apache.openjpa.util.Id incompatible with org.apache.openjpa.util.IntId
        at org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:825)
        at org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:724)
        at 
org.apache.openjpa.jdbc.kernel.JDBCStoreManager.load(JDBCStoreManager.java:776)
        at 
org.apache.openjpa.jdbc.sql.AbstractResult.load(AbstractResult.java:257)
        at 
org.apache.openjpa.jdbc.sql.SelectImpl$SelectResult.load(SelectImpl.java:2168)
        at 
org.apache.openjpa.jdbc.meta.strats.RelationFieldStrategy.loadEagerJoin(RelationFieldStrategy.java:510)
        at 
org.apache.openjpa.jdbc.meta.FieldMapping.loadEagerJoin(FieldMapping.java:790)
        at 
org.apache.openjpa.jdbc.kernel.JDBCStoreManager.load(JDBCStoreManager.java:825)
        at 
org.apache.openjpa.jdbc.kernel.JDBCStoreManager.load(JDBCStoreManager.java:785)
        at 
org.apache.openjpa.jdbc.kernel.JDBCStoreManager.initializeState(JDBCStoreManager.java:336)
        at 
org.apache.openjpa.jdbc.kernel.JDBCStoreManager.initialize(JDBCStoreManager.java:255)
        at 
org.apache.openjpa.kernel.DelegatingStoreManager.initialize(DelegatingStoreManager.java:111)
        at 
org.apache.openjpa.kernel.ROPStoreManager.initialize(ROPStoreManager.java:57)
        at 
org.apache.openjpa.kernel.BrokerImpl.initialize(BrokerImpl.java:844)
        at org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:802)
        at org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:724)
        at 
org.apache.openjpa.jdbc.kernel.JDBCStoreManager.load(JDBCStoreManager.java:776)
        at 
org.apache.openjpa.jdbc.sql.AbstractResult.load(AbstractResult.java:257)
        at 
org.apache.openjpa.jdbc.sql.SelectImpl$SelectResult.load(SelectImpl.java:2168)
        at 
org.apache.openjpa.jdbc.meta.strats.RelationToManyInverseKeyFieldStrategy.loadElement(RelationToManyInverseKeyFieldStrategy.java:87)
        at 
org.apache.openjpa.jdbc.meta.strats.RelationCollectionInverseKeyFieldStrategy.loadElement(RelationCollectionInverseKeyFieldStrategy.java:76)
        at 
org.apache.openjpa.jdbc.meta.strats.StoreCollectionFieldStrategy.load(StoreCollectionFieldStrategy.java:479)
        at 
org.apache.openjpa.jdbc.meta.FieldMapping.load(FieldMapping.java:802)
        at 
org.apache.openjpa.jdbc.kernel.JDBCStoreManager.load(JDBCStoreManager.java:485)
        at 
org.apache.openjpa.kernel.DelegatingStoreManager.load(DelegatingStoreManager.java:116)
        at 
org.apache.openjpa.kernel.ROPStoreManager.load(ROPStoreManager.java:78)
        at 
org.apache.openjpa.kernel.StateManagerImpl.loadFields(StateManagerImpl.java:2886)
        at 
org.apache.openjpa.kernel.StateManagerImpl.load(StateManagerImpl.java:360)
        at org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:812)
        at org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:724)
        at 
org.apache.openjpa.jdbc.kernel.JDBCStoreManager.load(JDBCStoreManager.java:776)
        at 
org.apache.openjpa.jdbc.sql.AbstractResult.load(AbstractResult.java:257)
        at 
org.apache.openjpa.jdbc.sql.SelectImpl$SelectResult.load(SelectImpl.java:2168)
        at 
org.apache.openjpa.jdbc.meta.strats.RelationFieldStrategy.loadEagerJoin(RelationFieldStrategy.java:510)
        at 
org.apache.openjpa.jdbc.meta.FieldMapping.loadEagerJoin(FieldMapping.java:790)
        at 
org.apache.openjpa.jdbc.kernel.JDBCStoreManager.load(JDBCStoreManager.java:825)
        at 
org.apache.openjpa.jdbc.kernel.JDBCStoreManager.load(JDBCStoreManager.java:785)
        at 
org.apache.openjpa.jdbc.kernel.JDBCStoreManager.initializeState(JDBCStoreManager.java:336)
        at 
org.apache.openjpa.jdbc.kernel.JDBCStoreManager.initialize(JDBCStoreManager.java:255)
        at 
org.apache.openjpa.kernel.DelegatingStoreManager.initialize(DelegatingStoreManager.java:111)
        at 
org.apache.openjpa.kernel.ROPStoreManager.initialize(ROPStoreManager.java:57)
        at 
org.apache.openjpa.kernel.BrokerImpl.initialize(BrokerImpl.java:844)
        at org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:802)
        at org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:724)
        at 
org.apache.openjpa.jdbc.kernel.JDBCStoreManager.load(JDBCStoreManager.java:776)
        at 
org.apache.openjpa.jdbc.sql.AbstractResult.load(AbstractResult.java:257)
        at 
org.apache.openjpa.jdbc.sql.SelectImpl$SelectResult.load(SelectImpl.java:2168)
        at 
org.apache.openjpa.jdbc.meta.strats.RelationFieldStrategy.loadEagerJoin(RelationFieldStrategy.java:510)
        at 
org.apache.openjpa.jdbc.meta.FieldMapping.loadEagerJoin(FieldMapping.java:790)
        at 
org.apache.openjpa.jdbc.kernel.JDBCStoreManager.load(JDBCStoreManager.java:825)
        at 
org.apache.openjpa.jdbc.kernel.JDBCStoreManager.load(JDBCStoreManager.java:785)
        at 
org.apache.openjpa.jdbc.kernel.JDBCStoreManager.initializeState(JDBCStoreManager.java:336)
        at 
org.apache.openjpa.jdbc.kernel.JDBCStoreManager.initialize(JDBCStoreManager.java:255)
        at 
org.apache.openjpa.kernel.DelegatingStoreManager.initialize(DelegatingStoreManager.java:111)
        at 
org.apache.openjpa.kernel.ROPStoreManager.initialize(ROPStoreManager.java:57)
        at 
org.apache.openjpa.kernel.BrokerImpl.initialize(BrokerImpl.java:844)
        at org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:802)
        at org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:724)
        at 
org.apache.openjpa.jdbc.kernel.JDBCStoreManager.load(JDBCStoreManager.java:776)
        at 
org.apache.openjpa.jdbc.sql.AbstractResult.load(AbstractResult.java:257)
        at 
org.apache.openjpa.jdbc.sql.SelectImpl$SelectResult.load(SelectImpl.java:2168)
        at 
org.apache.openjpa.jdbc.sql.AbstractResult.load(AbstractResult.java:251)
        at 
org.apache.openjpa.jdbc.kernel.InstanceResultObjectProvider.getResultObject(InstanceResultObjectProvider.java:59)
        at 
org.apache.openjpa.kernel.QueryImpl.singleResult(QueryImpl.java:1289)
        at 
org.apache.openjpa.kernel.QueryImpl.toResult(QueryImpl.java:1216)
        at org.apache.openjpa.kernel.QueryImpl.execute(QueryImpl.java:990)
        at org.apache.openjpa.kernel.QueryImpl.execute(QueryImpl.java:799)
        at org.apache.openjpa.kernel.QueryImpl.execute(QueryImpl.java:769)
        at 
org.apache.openjpa.kernel.DelegatingQuery.execute(DelegatingQuery.java:533)
        at 
org.apache.openjpa.persistence.QueryImpl.execute(QueryImpl.java:235)
        at 
org.apache.openjpa.persistence.QueryImpl.getSingleResult(QueryImpl.java:300)
        at 
com.mycompany.myproduct.ejb.session.PersistenceServiceBean.findPersistent(PersistenceServiceBean.java:246)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:79)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:618)
        at 
com.ibm.ejs.container.interceptors.InvocationContextImpl.proceed(InvocationContextImpl.java:547)
        at 
com.mycompany.myproduct.ejb.interceptor.PersistenceInterceptor.interceptPersistenceAction(PersistenceInterceptor.java:51)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:79)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:618)
        at 
com.ibm.ejs.container.interceptors.InterceptorProxy.invokeInterceptor(InterceptorProxy.java:227)
        at 
com.ibm.ejs.container.interceptors.InvocationContextImpl.proceed(InvocationContextImpl.java:526)
        at 
com.ibm.ejs.container.interceptors.InvocationContextImpl.doAroundInvoke(InvocationContextImpl.java:184)
        at 
com.ibm.ejs.container.EJSContainer.invoke(EJSContainer.java:5545)
        at 
com.mycompany.myproduct.ejb.ejbInterfaces.EJSLocal0SLPersistenceServiceBean_2a6dfad6.findPersistent(EJSLocal0SLPersistenceServiceBean_2a6dfad6.java)
        at 
com.mycompany.myproduct.ejb.session.SessionFacadeBean.findPersistent(SessionFacadeBean.java:77)
        at 
com.mycompany.myproduct.ejb.ejbInterfaces.EJSRemote0SLSessionFacadeBean_4b075f78.findPersistent(EJSRemote0SLSessionFacadeBean_4b075f78.java)
        at 
com.mycompany.myproduct.ejb.ejbInterfaces._EJSRemote0SLSessionFacadeBean_4b075f78_Tie.findPersistent(_EJSRemote0SLSessionFacadeBean_4b075f78_Tie.java)
        at 
com.mycompany.myproduct.ejb.ejbInterfaces._EJSRemote0SLSessionFacadeBean_4b075f78_Tie._invoke(_EJSRemote0SLSessionFacadeBean_4b075f78_Tie.java)
        at 
com.ibm.CORBA.iiop.ServerDelegate.dispatchInvokeHandler(ServerDelegate.java:621)
        at 
com.ibm.CORBA.iiop.ServerDelegate.dispatch(ServerDelegate.java:474)
        at com.ibm.rmi.iiop.ORB.process(ORB.java:503)
        at com.ibm.CORBA.iiop.ORB.process(ORB.java:1571)
        at com.ibm.rmi.iiop.Connection.respondTo(Connection.java:2701)
        at com.ibm.rmi.iiop.Connection.doWork(Connection.java:2575)
        at com.ibm.rmi.iiop.WorkUnitImpl.doWork(WorkUnitImpl.java:62)
        at com.ibm.ejs.oa.pool.PooledThread.run(ThreadPool.java:118)
        at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1473)
Caused by: java.lang.ClassCastException: org.apache.openjpa.util.Id 
incompatible with org.apache.openjpa.util.IntId
        at 
com.mycompany.myproduct.ejb.entities.EntitySuperclass.pcCopyKeyFieldsFromObjectId(EntitySuperclass.java)
        at 
com.mycompany.myproduct.ejb.entities.EntityClass.pcNewInstance(EntityClass.java)
        at 
org.apache.openjpa.enhance.PCRegistry.newInstance(PCRegistry.java:121)
        at 
org.apache.openjpa.kernel.StateManagerImpl.initialize(StateManagerImpl.java:253)
        at 
org.apache.openjpa.jdbc.kernel.JDBCStoreManager.initializeState(JDBCStoreManager.java:330)
        at 
org.apache.openjpa.jdbc.kernel.JDBCStoreManager.initialize(JDBCStoreManager.java:255)
        at 
org.apache.openjpa.kernel.DelegatingStoreManager.initialize(DelegatingStoreManager.java:111)
        at 
org.apache.openjpa.kernel.ROPStoreManager.initialize(ROPStoreManager.java:57)
        at 
org.apache.openjpa.kernel.BrokerImpl.initialize(BrokerImpl.java:844)
        at org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:802)
        ... 99 more

Dump of callerThis = 
Object type = com.ibm.ejs.container.BusinessExceptionMappingStrategy
[EMAIL PROTECTED]

==> Performing default dump from 
com.ibm.ejs.container.EJBContainerDiagnosticModule  = Mon Sep 29 18:46:11 
CEST 2008
+Data for directive [defaultbindingsmaps] obtained. = 
>EJB DM: Object array. = null
Dump of EJBContainer Internals = 
Object type = com.ibm.ejs.container.EJSContainer
[EMAIL PROTECTED]

+Data for directive [default] obtained. = 
Dump of ComponentMetaData = 
                                 *** START ComponentMetaData fields ***
                                 J2EEName       = 
MyProduct_EAP_(Websphere)#MyProduct_EAP_EJB_Module.jar#PersistenceServiceBean
                                 EJB Type       = STATELESS_SESSION
                                 TX Type        = CONTAINER_MANAGED_TX
                                 Module Version = 30
                                     ******* ResRefList ******* 
                                 ResRefList size=0
                                       ****** LOCAL-TRANSACTION *******
                                 Boundary=BEAN_METHOD
                                 Resolver=APPLICATION
                                 UnResolvedAction=ROLLBACK
                                 *** END ComponentMetaData fields  ***
+Data for directive [defaultcomponentmetadata] obtained. = 

Dump of EJBMethodInfo from EJSDeployedSupport = 
  *** START EJBMethodInfoImpl fields ***
     method signature  = 
findPersistent:java.lang.Class,com.we4it.util.Entry[]
     Method index      = 8
     TX attribute      = TX_REQUIRED
     AS attribute      = AS_UNKNOWN
     CMP 1.x Isolation Level = TRANSACTION_NONE
     CMP 1.x access intent(read-only attribute) = false
     JDI signature     = 
(Ljava/lang/Class;[Lcom/we4it/util/Entry;)Ljava/lang/Object;
     *** Security Policy Information *** 
     DenyAll     = false
     PermitAll     = false
     RolesAllowed     = null
  *** END EJBMethodInfoImpl fields ***

+Data for directive [defaultejbmethodinfo] obtained. = 
Dump of ContainerTx = 

*** Start ContainerTx Dump    ---> [EMAIL PROTECTED]

  Tx Key                  = 
[EMAIL PROTECTED]
  State                   = Active
  Entered beforCompletion = false
  Marked Rollback Only    = false
  Method Began            = false
  Isolation Level         = TRANSACTION_NONE
  Callback BeanO          = 
StatelessBeanO(BeanId(MyProduct_EAP_(Websphere)#MyProduct_EAP_EJB_Module.jar#PersistenceServiceBean,
 
null), state = IN_METHOD)

  --- Dump of Enlisted Beans : 0 ---------------------- 


  --- Dump of Access Intents : 0 ---------------------- 

*** ContainerTx Dump Complete ---> [EMAIL PROTECTED]

+Data for directive [defaultcontainertx] obtained. = 
==> Dump complete for com.ibm.ejs.container.EJBContainerDiagnosticModule = 
Mon Sep 29 18:46:11 CEST 2008
-----------------------< end of log dump by WebSphere 
>--------------------

Mit freundlichen Grüßen  / Best regards
We4IT GmbH

Stephan Koops

-----------------------------------------------------------------------------------------------------------------------------------------------------
We4IT GmbH
Haferwende 3a
28357 Bremen

Tel.: +49 421-98973-24
Fax: +49 421-98973-01
E-Mail: [EMAIL PROTECTED]
Internet: http://www.we4it.com

HRB 20740, Amtsgericht Bremen 
Geschäftsführer: Stefan Sucker, Vicente Diaz Fernandez
USt.-ID.-Nr. DE 220 859 831
------------------------------------------------------------------------------------------------------------------------------------------------------

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