I'm struggling to solve the error I've been receiving. In overview, I have two types of people in the system, Provider and Clients. A Provider can have many ProviderContacts and a Client can have many ClientContacts. When I attempt to load a Client (which has a mapped collection to ClientContacts), I get an error.

This is the query I'm running:

SELECT c
FROM Client c
WHERE c.relationship.relationshipId LIKE :expression OR
 c.taxId LIKE :expression OR
 c.clientName LIKE :expression

14:41:37,846 ERROR [BasicPropertyAccessor] IllegalArgumentException in class: com.tasconline.client.ClientContact, setter method of property: client
14:41:37,846 ERROR [BasicPropertyAccessor] expected type: com.tasconline.client.Client, actual value: com.tasconline.provider.Provider
14:41:37,846 INFO [DefaultLoadEventListener] Error performing load command
org.hibernate.PropertyAccessException: IllegalArgumentException occurred while calling setter of com.tasconline.client.ClientContact.client
 at org.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:104)
 at org.hibernate.tuple.AbstractEntityTuplizer.setPropertyValues(AbstractEntityTuplizer.java:330)
 at org.hibernate.tuple.PojoEntityTuplizer.setPropertyValues(PojoEntityTuplizer.java:188)
 at org.hibernate.persister.entity.AbstractEntityPersister.setPropertyValues(AbstractEntityPersister.java:3231)
 at org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:126)
 at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:842)
 at org.hibernate.loader.Loader.doQuery(Loader.java:717)
 at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:223)

@Entity
@Table(name="tasc_client")
@Inheritance(strategy=InheritanceType.JOINED,
 discriminatorValue="Client")
@PrimaryKeyJoinColumn(name="fk_tasc_relationship_binding")
public class Client extends RelationshipBinding {

 private static final String BINDING_TYPE = "Client";

 private TaxId taxId;
 private TaxFilingStatus taxFilingStatus;
 private OrganizationName clientName;
 private Address shippingAddress;
 private Address billingAddress;
 private Collection<ClientContact> contacts;

 /**
 *
 */
 public Client() {
 this.bindingType = BINDING_TYPE;
 this.contacts = new LinkedList<ClientContact>();
 }

 /**
 *
 */
 @Embedded
 @AttributeOverride(name="id", column=@Column(name="taxId"))
 public TaxId getTaxId() {
 return(this.taxId);
 }

 /**
 *
 */
 public void setTaxId(TaxId taxId) {
 this.taxId = taxId;
 }

 /**
 *
 */
 @Transient
 public TaxFilingStatus getTaxFilingStatus() {
 return(this.taxFilingStatus);
 }

 /**
 *
 */
 @Transient
 public void setTaxFilingStatus(TaxFilingStatus taxFilingStatus) {
 this.taxFilingStatus = taxFilingStatus;
 }

 /**
 *
 */
 @Column(name="taxFilingStatus")
 public String getTaxFilingStatusType(String taxFilingStatusType) {
 if (this.taxFilingStatus == null) return(null);
 return(this.taxFilingStatus.name());
 }

 /**
 *
 */
 public void setTaxFilingStatusType(String taxFilingStatusType) {
 if (taxFilingStatusType == null) {
 this.taxFilingStatus = null;
 return;
 } else {
 for (TaxFilingStatus status: TaxFilingStatus.values()) {
 if (status.name().equals(taxFilingStatusType)) {
 this.taxFilingStatus = status;
 return;
 }
 }
 throw new IllegalArgumentException
 ("Invalid TaxFilingStatus: " + taxFilingStatusType);
 }
 }

 /**
 *
 */
 @Embedded
 @AttributeOverride(name="name", column=@Column(name="clientName"))
 public OrganizationName getClientName() {
 return(this.clientName);
 }

 /**
 *
 */
 public void setClientName(OrganizationName clientName) {
 this.clientName = clientName;
 }

 /**
 *
 */
 @Embedded
 @AttributeOverrides({
 @AttributeOverride(name="address1", column=@Column(name="shippingAddress1")),
 @AttributeOverride(name="address2", column=@Column(name="shippingAddress2")),
 @AttributeOverride(name="city", column=@Column(name="shippingCity")),
 @AttributeOverride(name="stateAbbreviation", column=@Column(name="shippingState")),
 @AttributeOverride(name="deliveryArea", column=@Column(name="shippingDeliveryArea")),
 @AttributeOverride(name="plusFour", column=@Column(name="shippingPlusFour"))
 })
 public Address getShippingAddress() {
 return(this.shippingAddress);
 }

 /**
 *
 */
 public void setShippingAddress(Address shippingAddress) {
 this.shippingAddress = shippingAddress;
 }

 /**
 *
 */
 @AttributeOverrides({
 @AttributeOverride(name="address1", column=@Column(name="billingAddress1")),
 @AttributeOverride(name="address2", column=@Column(name="billingAddress2")),
 @AttributeOverride(name="city", column=@Column(name="billingCity")),
 @AttributeOverride(name="stateAbbreviation", column=@Column(name="billingState")),
 @AttributeOverride(name="deliveryArea", column=@Column(name="billingDeliveryArea")),
 @AttributeOverride(name="plusFour", column=@Column(name="billingPlusFour"))
 })
 public Address getBillingAddress() {
 return(this.billingAddress);
 }

 /**
 *
 */
 public void setBillingAddress(Address billingAddress) {
 this.billingAddress = billingAddress;
 }

 /**
 *
 */
 @OneToMany(
 mappedBy="client",
 fetch=FetchType.EAGER,
 cascade=CascadeType.ALL)
 public Collection<ClientContact> getContacts() {
 return(this.contacts);
 }

 /**
 *
 */
 public void setContacts(Collection<ClientContact> contacts) {
 this.contacts = contacts;
 }

 /**
 *
 */
 @Transient
 public Contact getPrimaryContact() {

 // see if there is a primary
 for (ClientContact contact: this.contacts) {
 if (contact.isPrimary()) {
 return(contact);
 }
 }

 // no primary
 return(null);

 }

@Entity
@Table(name="tasc_client_contact")
@Inheritance
public class ClientContact extends ValueObject
 implements Contact, Comparable<Contact> {

 private Client client;
 private Boolean primary;
 private PersonName name;
 private PhoneNumber homeNumber;
 private PhoneNumber businessNumber;
 private PhoneNumber faxNumber;
 private PhoneNumber mobileNumber;
 private EmailAddress emailAddress;
 private Address address;

 /**
 *
 */
 @ManyToOne(targetEntity=com.tasconline.client.Client.class,
 fetch=FetchType.EAGER)
 @JoinColumn(name="fk_tasc_client")
 public Client getClient() {
 return(this.client);
 }

 /**
 *
 */
 public void setClient(Client client) {
 this.client = client;
 }

 /**
 *
 */
 @Column(name="primaryContact")
 public Boolean isPrimary() {
 return(this.primary);
 }

 /**
 *
 */
 public void setPrimary(Boolean primary) {
 this.primary = primary;
 }

 /**
 *
 */
 @Embedded
 public PersonName getName()
 {
 return(this.name);
 }

 /**
 *
 */
 public void setName(PersonName name)
 {
 this.name = name;
 }

 /**
 *
 */
 @Embedded
 @AttributeOverrides({
 @AttributeOverride(name="areaCode", column=@Column(name="homeNumberAreaCode")),
 @AttributeOverride(name="trunk", column=@Column(name="homeNumberTrunk")),
 @AttributeOverride(name="number", column=@Column(name="homeNumberNumber")),
 @AttributeOverride(name="extension",column=@Column(name="homeNumberExtension"))
 })
 public PhoneNumber getHomeNumber()
 {
 return(this.homeNumber);
 }

 /**
 *
 */
 public void setHomeNumber(PhoneNumber homeNumber)
 {
 this.homeNumber = homeNumber;
 }

 /**
 *
 */
 @Embedded
 @AttributeOverrides({
 @AttributeOverride(name="areaCode", column=@Column(name="businessNumberAreaCode")),
 @AttributeOverride(name="trunk", column=@Column(name="businessNumberTrunk")),
 @AttributeOverride(name="number", column=@Column(name="businessNumberNumber")),
 @AttributeOverride(name="extension",column=@Column(name="businessNumberExtension"))
 })
 public PhoneNumber getBusinessNumber()
 {
 return(this.businessNumber);
 }

 /**
 *
 */
 public void setBusinessNumber(PhoneNumber businessNumber)
 {
 this.businessNumber = businessNumber;
 }

 /**
 *
 */
 @Embedded
 @AttributeOverrides({
 @AttributeOverride(name="areaCode", column=@Column(name="faxNumberAreaCode")),
 @AttributeOverride(name="trunk", column=@Column(name="faxNumberTrunk")),
 @AttributeOverride(name="number", column=@Column(name="faxNumberNumber")),
 @AttributeOverride(name="extension",column=@Column(name="faxNumberExtension"))
 })
 public PhoneNumber getFaxNumber()
 {
 return(this.faxNumber);
 }

 /**
 *
 */
 public void setFaxNumber(PhoneNumber faxNumber)
 {
 this.faxNumber = faxNumber;
 }

 /**
 *
 */
 @Embedded
 @AttributeOverrides({
 @AttributeOverride(name="areaCode", column=@Column(name="mobileNumberAreaCode")),
 @AttributeOverride(name="trunk", column=@Column(name="mobileNumberTrunk")),
 @AttributeOverride(name="number", column=@Column(name="mobileNumberNumber")),
 @AttributeOverride(name="extension",column=@Column(name="mobileNumberExtension"))
 })
 public PhoneNumber getMobileNumber()
 {
 return(this.mobileNumber);
 }

 /**
 *
 */
 public void setMobileNumber(PhoneNumber mobileNumber)
 {
 this.mobileNumber = mobileNumber;
 }

 /**
 *
 */
 @Embedded
 @AttributeOverride(name="address", column=@Column(name="emailAddress"))
 public EmailAddress getEmailAddress()
 {
 return(this.emailAddress);
 }

 /**
 *
 */
 public void setEmailAddress(EmailAddress emailAddress)
 {
 this.emailAddress = emailAddress;
 }

 /**
 *
 */
 @Embedded
 public Address getAddress() {
 return(this.address);
 }

 /**
 *
 */
 public void setAddress(Address address) {
 this.address = address;
 }

}