如何在带有冬眠的实体中将日期设置为主键

Question

I have entity with 3 primary key That third is type of date and when i try to insert data in entity i encounter an error --> org.hibernate.id.IdentifierGenerationException: Unknown integral data type for ids : java.util.Date

i found the solution for String but not for date type.

and this is my entity:

import javax.persistence.*;
import java.util.Date;
import java.util.List;

@Entity
public class PartyContactMech extends BaseEntity {

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long partyId;

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long contactMechPurposeId;

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Date fromDate;

@Column
private Date usedSince;

@OneToMany(cascade = CascadeType.ALL)
private List<ContactMech> ContactMeches;

@OneToOne(cascade = CascadeType.ALL)
private ContactMechPurpose contactMechPurpose;

public Long getPartyId() {
    return partyId;
}

public void setPartyId(Long partyId) {
    this.partyId = partyId;
}

public Long getContactMechPurposeId() {
    return contactMechPurposeId;
}

public void setContactMechPurposeId(Long contactMechPurposeId) {
    this.contactMechPurposeId = contactMechPurposeId;
}

public Date getFromDate() {
    return fromDate;
}

public void setFromDate(Date fromDate) {
    this.fromDate = fromDate;
}

public Date getUsedSince() {
    return usedSince;
}

public void setUsedSince(Date usedSince) {
    this.usedSince = usedSince;
}

public List<ContactMech> getContactMeches() {
    return ContactMeches;
}

public void setContactMeches(List<ContactMech> contactMeches) {
    ContactMeches = contactMeches;
}

public ContactMechPurpose getContactMechPurpose() {
    return contactMechPurpose;
}

public void setContactMechPurpose(ContactMechPurpose contactMechPurpose)                              
{
    this.contactMechPurpose = contactMechPurpose;
    }
}

anyone can help,thanks

Answer 1

Try to remove @GeneratedValue(strategy = GenerationType.AUTO) fromDate. GenerationType.AUTO is for autoIncrement field.

Answer 2

Try like this

@Id
@GeneratedValue(strategy = AUTO)
@Column
private long id;