Spring JPA + Toplink Issues

Question

Heya,
I followed a developer works tutorial on integrating Toplink with Spring, and everything seemed to go well, when I start up the application, it looks like Toplink finds all my annotations and validates them (if any where invalid, it sure lets me know). However, when I go to persist my object, I get an IllegalArgumentException:
Caused by: java.lang.IllegalArgumentException: Object: au.gov.nla.aons2.registry.domain.Registry@f3b83 is not a known entity type.
     at oracle.toplink.essentials.internal.sessions.UnitOfWorkImpl.registerNewObjectForPersist(UnitOfWorkImpl.java:3198)
     at oracle.toplink.essentials.internal.ejb.cmp3.base.EntityManagerImpl.persist(EntityManagerImpl.java:190)
     at org.springframework.orm.jpa.JpaTemplate$5.doInJpa(JpaTemplate.java:263)
     at org.springframework.orm.jpa.JpaTemplate.execute(JpaTemplate.java:191)
My Registry should be valid; at first I thought it was something to do with class hierarchies, but I removed that from the equation and I'm still getting the error. My class looks like this:
@Entity
@Table(name="registry", uniqueConstraints= {@UniqueConstraint(columnNames={"name"})})
public class Registry implements Serializable {
private static final long serialVersionUID = -4335133039987702902L;
@Id
private Long id;
private String name;
@Temporal(TemporalType.TIMESTAMP)
     private Calendar lastRun;
private String url;
@OneToOne(cascade=CascadeType.ALL)
@PrimaryKeyJoinColumn
     private Schedule schedule;
     private String status = ScheduleStatus.IDLE;
     public Long getId() {
          return id;
     public void setId(Long id) {
          this.id = id;
     public Calendar getLastRun() {
          return lastRun;
     public void setLastRun(Calendar lastRun) {
          this.lastRun = lastRun;
     public String getName() {
          return name;
     public void setName(String name) {
          this.name = name;
@Transient
     public String getType()
throw new RuntimeException("this should be overridden.");
     public String getUrl() {
          return url;
     public void setUrl(String url) {
          this.url = url;
     public Schedule getSchedule() {
          return schedule;
     public void setSchedule(Schedule schedule) {
          this.schedule = schedule;
     public String getStatus() {
          return status;
     public void setStatus(String status) {
          this.status = status;
My Spring config looks like this:
     <bean id="entityManagerFactory"
          class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
          <property name="jpaVendorAdapter">
               <bean
                    class="org.springframework.orm.jpa.vendor.TopLinkJpaVendorAdapter">
                    <property name="generateDdl" value="true" />
                    <property name="showSql" value="true" />
                    <property name="databasePlatform"
                         value="oracle.toplink.essentials.platform.database.HSQLPlatform" />
               </bean>
          </property>
          <property name="dataSource" ref="dataSource" />
          <property name="loadTimeWeaver">
               <bean
                    class="org.springframework.instrument.classloading.SimpleLoadTimeWeaver" />
          </property>
     </bean>
My persistence.xml looks like this:
<persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" version="1.0">
     <persistence-unit name="aons" transaction-type="RESOURCE_LOCAL">
     </persistence-unit>
</persistence>
Finally, and here's the really odd part, my log displays the registering of the Registry Class as a persistence object:
[TopLink Config]: 2007.04.17 09:32:50.874--ServerSession(21324485)--Thread(Thread[main,5,main])--The alias name for the entity class [class au.gov.nla.aons2.registry.domain.LcDfwRegistry] is being defaulted to: LcDfwRegistry.
[TopLink Config]: 2007.04.17 09:32:50.890--ServerSession(21324485)--Thread(Thread[main,5,main])--The alias name for the entity class [class au.gov.nla.aons2.registry.domain.Registry] is being defaulted to: Registry.
[TopLink Config]: 2007.04.17 09:32:50.921--ServerSession(21324485)--Thread(Thread[main,5,main])--The column name for element [private java.lang.Long au.gov.nla.aons2.registry.domain.Registry.id] is being defaulted to: ID.
[TopLink Config]: 2007.04.17 09:32:50.937--ServerSession(21324485)--Thread(Thread[main,5,main])--The column name for element [private java.lang.String au.gov.nla.aons2.registry.domain.Registry.name] is being defaulted to: NAME.
[TopLink Config]: 2007.04.17 09:32:50.952--ServerSession(21324485)--Thread(Thread[main,5,main])--The column name for element [private java.util.Calendar au.gov.nla.aons2.registry.domain.Registry.lastRun] is being defaulted to: LASTRUN.
[TopLink Config]: 2007.04.17 09:32:50.952--ServerSession(21324485)--Thread(Thread[main,5,main])--The column name for element [private java.lang.String au.gov.nla.aons2.registry.domain.Registry.url] is being defaulted to: URL.
[TopLink Config]: 2007.04.17 09:32:50.983--ServerSession(21324485)--Thread(Thread[main,5,main])--The column name for element [private java.lang.String au.gov.nla.aons2.registry.domain.Registry.status] is being defaulted to: STATUS.
[TopLink Config]: 2007.04.17 09:32:50.999--ServerSession(21324485)--Thread(Thread[main,5,main])--The discriminator column name for the root inheritance class [class au.gov.nla.aons2.registry.domain.Registry] is being defaulted to: DTYPE.
[TopLink Config]: 2007.04.17 09:32:50.999--ServerSession(21324485)--Thread(Thread[main,5,main])--The alias name for the entity class [class au.gov.nla.aons2.schedule.domain.DayOfMonth] is being defaulted to: DayOfMonth.
[TopLink Config]: 2007.04.17 09:32:50.999--ServerSession(21324485)--Thread(Thread[main,5,main])--The table name for entity [class au.gov.nla.aons2.schedule.domain.DayOfMonth] is being defaulted to: DAYOFMONTH.
[TopLink Config]: 2007.04.17 09:32:50.999--ServerSession(21324485)--Thread(Thread[main,5,main])--The column name for element [private java.lang.Long au.gov.nla.aons2.schedule.domain.DayOfMonth.id] is being defaulted to: ID.
[TopLink Config]: 2007.04.17 09:32:50.999--ServerSession(21324485)--Thread(Thread[main,5,main])--The column name for element [private java.lang.Integer au.gov.nla.aons2.schedule.domain.DayOfMonth.dayOfMonth] is being defaulted to: DAYOFMONTH.
[TopLink Config]: 2007.04.17 09:32:50.999--ServerSession(21324485)--Thread(Thread[main,5,main])--The alias name for the entity class [class au.gov.nla.aons2.registry.domain.GdfrRegistry] is being defaulted to: GdfrRegistry.
[TopLink Config]: 2007.04.17 09:32:50.999--ServerSession(21324485)--Thread(Thread[main,5,main])--The alias name for the entity class [class au.gov.nla.aons2.registry.domain.PronomRegistry] is being defaulted to: PronomRegistry.
[TopLink Config]: 2007.04.17 09:32:50.999--ServerSession(21324485)--Thread(Thread[main,5,main])--The alias name for the entity class [class au.gov.nla.aons2.schedule.domain.Schedule] is being defaulted to: Schedule.
[TopLink Config]: 2007.04.17 09:32:50.999--ServerSession(21324485)--Thread(Thread[main,5,main])--The table name for entity [class au.gov.nla.aons2.schedule.domain.Schedule] is being defaulted to: SCHEDULE.
[TopLink Config]: 2007.04.17 09:32:50.999--ServerSession(21324485)--Thread(Thread[main,5,main])--The column name for element [private java.lang.Long au.gov.nla.aons2.schedule.domain.Schedule.id] is being defaulted to: ID.
[TopLink Config]: 2007.04.17 09:32:50.999--ServerSession(21324485)--Thread(Thread[main,5,main])--The column name for element [private java.lang.String au.gov.nla.aons2.schedule.domain.Schedule.scheduleType] is being defaulted to: SCHEDULETYPE.
[TopLink Config]: 2007.04.17 09:32:50.999--ServerSession(21324485)--Thread(Thread[main,5,main])--The column name for element [private java.lang.Integer au.gov.nla.aons2.schedule.domain.Schedule.hour] is being defaulted to: HOUR.
[TopLink Config]: 2007.04.17 09:32:50.999--ServerSession(21324485)--Thread(Thread[main,5,main])--The column name for element [private java.lang.Integer au.gov.nla.aons2.schedule.domain.Schedule.minutes] is being defaulted to: MINUTES.
[TopLink Config]: 2007.04.17 09:32:50.999--ServerSession(21324485)--Thread(Thread[main,5,main])--Element [private java.util.List au.gov.nla.aons2.schedule.domain.Schedule.weekdays] is being defaulted to a one to many mapping.
[TopLink Config]: 2007.04.17 09:32:51.015--ServerSession(21324485)--Thread(Thread[main,5,main])--Element [private java.util.List au.gov.nla.aons2.schedule.domain.Schedule.daysOfMonth] is being defaulted to a one to many mapping.
[TopLink Config]: 2007.04.17 09:32:51.015--ServerSession(21324485)--Thread(Thread[main,5,main])--The column name for element [private java.lang.String au.gov.nla.aons2.schedule.domain.Schedule.descriptiveString] is being defaulted to: DESCRIPTIVESTRING.
[TopLink Config]: 2007.04.17 09:32:51.015--ServerSession(21324485)--Thread(Thread[main,5,main])--The alias name for the entity class [class au.gov.nla.aons2.schedule.domain.Weekday] is being defaulted to: Weekday.
[TopLink Config]: 2007.04.17 09:32:51.015--ServerSession(21324485)--Thread(Thread[main,5,main])--The table name for entity [class au.gov.nla.aons2.schedule.domain.Weekday] is being defaulted to: WEEKDAY.
[TopLink Config]: 2007.04.17 09:32:51.015--ServerSession(21324485)--Thread(Thread[main,5,main])--The column name for element [private java.lang.Long au.gov.nla.aons2.schedule.domain.Weekday.id] is being defaulted to: ID.
[TopLink Config]: 2007.04.17 09:32:51.015--ServerSession(21324485)--Thread(Thread[main,5,main])--The column name for element [private java.lang.String au.gov.nla.aons2.schedule.domain.Weekday.name] is being defaulted to: NAME.
[TopLink Config]: 2007.04.17 09:32:51.015--ServerSession(21324485)--Thread(Thread[main,5,main])--The target entity (reference) class for the one to one mapping element [private au.gov.nla.aons2.schedule.domain.Schedule au.gov.nla.aons2.registry.domain.Registry.schedule] is being defaulted to: class au.gov.nla.aons2.schedule.domain.Schedule.
[TopLink Config]: 2007.04.17 09:32:51.108--ServerSession(21324485)--Thread(Thread[main,5,main])--The primary key column name for the mapping element [private au.gov.nla.aons2.schedule.domain.Schedule au.gov.nla.aons2.registry.domain.Registry.schedule] is being defaulted to: ID.
[TopLink Config]: 2007.04.17 09:32:51.108--ServerSession(21324485)--Thread(Thread[main,5,main])--The foreign key column name for the mapping element [private au.gov.nla.aons2.schedule.domain.Schedule au.gov.nla.aons2.registry.domain.Registry.schedule] is being defaulted to: ID.
[TopLink Config]: 2007.04.17 09:32:51.108--ServerSession(21324485)--Thread(Thread[main,5,main])--The target entity (reference) class for the one to many mapping element [private java.util.List au.gov.nla.aons2.schedule.domain.Schedule.daysOfMonth] is being defaulted to: class au.gov.nla.aons2.schedule.domain.DayOfMonth.
[TopLink Config]: 2007.04.17 09:32:51.155--ServerSession(21324485)--Thread(Thread[main,5,main])--The join table name for the many to many mapping [private java.util.List au.gov.nla.aons2.schedule.domain.Schedule.daysOfMonth] is being defaulted to: SCHEDULE_DAYOFMONTH.
[TopLink Config]: 2007.04.17 09:32:51.155--ServerSession(21324485)--Thread(Thread[main,5,main])--The source primary key column name for the many to many mapping [private java.util.List au.gov.nla.aons2.schedule.domain.Schedule.daysOfMonth] is being defaulted to: ID.
[TopLink Config]: 2007.04.17 09:32:51.155--ServerSession(21324485)--Thread(Thread[main,5,main])--The source foreign key column name for the many to many mapping [private java.util.List au.gov.nla.aons2.schedule.domain.Schedule.daysOfMonth] is being defaulted to: Schedule_ID.
[TopLink Config]: 2007.04.17 09:32:51.155--ServerSession(21324485)--Thread(Thread[main,5,main])--The target primary key column name for the many to many mapping [private java.util.List au.gov.nla.aons2.schedule.domain.Schedule.daysOfMonth] is being defaulted to: ID.
[TopLink Config]: 2007.04.17 09:32:51.171--ServerSession(21324485)--Thread(Thread[main,5,main])--The target foreign key column name for the many to many mapping [private java.util.List au.gov.nla.aons2.schedule.domain.Schedule.daysOfMonth] is being defaulted to: daysOfMonth_ID.
[TopLink Config]: 2007.04.17 09:32:51.171--ServerSession(21324485)--Thread(Thread[main,5,main])--The target entity (reference) class for the one to many mapping element [private java.util.List au.gov.nla.aons2.schedule.domain.Schedule.weekdays] is being defaulted to: class au.gov.nla.aons2.schedule.domain.Weekday.
[TopLink Config]: 2007.04.17 09:32:51.171--ServerSession(21324485)--Thread(Thread[main,5,main])--The join table name for the many to many mapping [private java.util.List au.gov.nla.aons2.schedule.domain.Schedule.weekdays] is being defaulted to: SCHEDULE_WEEKDAY.
[TopLink Config]: 2007.04.17 09:32:51.171--ServerSession(21324485)--Thread(Thread[main,5,main])--The source primary key column name for the many to many mapping [private java.util.List au.gov.nla.aons2.schedule.domain.Schedule.weekdays] is being defaulted to: ID.
[TopLink Config]: 2007.04.17 09:32:51.171--ServerSession(21324485)--Thread(Thread[main,5,main])--The source foreign key column name for the many to many mapping [private java.util.List au.gov.nla.aons2.schedule.domain.Schedule.weekdays] is being defaulted to: Schedule_ID.
[TopLink Config]: 2007.04.17 09:32:51.171--ServerSession(21324485)--Thread(Thread[main,5,main])--The target primary key column name for the many to many mapping [private java.util.List au.gov.nla.aons2.schedule.domain.Schedule.weekdays] is being defaulted to: ID.
[TopLink Config]: 2007.04.17 09:32:51.171--ServerSession(21324485)--Thread(Thread[main,5,main])--The target foreign key column name for the many to many mapping [private java.util.List au.gov.nla.aons2.schedule.domain.Schedule.weekdays] is being defaulted to: weekdays_ID.
I really don't get it... I think I'm going to have a look at the source and see if I can figure it out. Apart from this problem, I was really enjoying JPA;P

Answer 1

Okay, I think I've found the problem, but don't know what is causing it. When my code attempts to persist my object, it fails on the Class.equals method. For some reason (classloaders I'll bet), there are two instances of the Class Registry, with two different object ids - so when it calls:
// Optimize descriptor lookup through caching the last one accessed.
ClassDescriptor lastDescriptor = this.lastDescriptorAccessed;
if ((lastDescriptor != null) && (lastDescriptor.getJavaClass().equals(theClass))) {
return lastDescriptor;
And should match, the Class.equals() fails:
public boolean equals(Object obj) {
     return (this == obj);
So... what now, if it is a class loading issue, how do I ensure that there is only one copy of the Registry class object instantiated. If it isn't a class loading issue, what else could it be?