Object with id was not of the specified subclass

Question

I'm getting a weird error on my application.
I'm trying to retrieve an list of entity from database (MySQL) with session.createCriteria().list() but I'm getting this org.hibernate.WrongClassException.

I have looked up this error and I know what it means, but I don't know how to solve it on my context.

I have the following database structure:

CREATE TABLE vtiger_crmentity (
`crmid` int(19) NOT NULL
)

CREATE TABLE vtiger_account (
    `accountid` int(19) NOT NULL DEFAULT 0
)

CREATE TABLE vtiger_accountscf (
    `accountid` int(19) NOT NULL DEFAULT 0
)

CREATE TABLE vtiger_accoutshipads (
`accountaddressid` int(19) NOT NULL DEFAULT 0
)

CREATE TABLE vtiger_accountbillads (
    `accountaddressid` int(19) NOT NULL DEFAULT 0
)

So, quickly explaining, all the tables are linked by the these id columns, and in the last level, the vtiger_accountscf table has 1 vtiger_accountshipads and 1 vtiger_accountbillads. All the tables have the same PK.
So I made my classes like this (stubs):

@Entity
@Inheritance(strategy = InheritanceType.JOINED)
@Table(name = "vtiger_crmentity")
public class VtigerCrmentity {
  @Id
  @Basic(optional = false)
  @Column(name = "crmid", nullable = false)
  public Integer getId() {
    return this.id;

  }
}


@Entity
@PrimaryKeyJoinColumn(name = "accountid")
@Inheritance(strategy = InheritanceType.JOINED)
@Table(name = "vtiger_account")
public class VtigerAccount extends VtigerCrmentity {

}

@Entity
@PrimaryKeyJoinColumn(name = "accountid")
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
@Table(name = "vtiger_accountscf")
public class VtigerAccountscf extends VtigerAccount {
}

@Entity
@PrimaryKeyJoinColumn(name = "accountaddressid")
@Table(name = "vtiger_accountbillads")
public class VtigerAccountbillads extends VtigerAccountscf {
}

@Entity
@PrimaryKeyJoinColumn(name = "accountaddressid")
@Table(name = "vtiger_accountshipads")
public class VtigerAccountshipads extends VtigerAccountscf {
}

And here's my problem. When I do:

getSession().createCriteria(VtigerAccountbillads.class).list();

I'm getting the exception:

org.hibernate.WrongClassException: Object with id: 11952 was not of the specified subclass: VtigerAccountbillads (loaded object was of wrong class class VtigerAccountshipads)
    at org.hibernate.loader.Loader.instanceAlreadyLoaded(Loader.java:1391)
    at org.hibernate.loader.Loader.getRow(Loader.java:1344)
    at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:611)
    at org.hibernate.loader.Loader.doQuery(Loader.java:829)
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:274)
    at org.hibernate.loader.Loader.doList(Loader.java:2533)
    at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2276)
    at org.hibernate.loader.Loader.list(Loader.java:2271)
    at org.hibernate.loader.criteria.CriteriaLoader.list(CriteriaLoader.java:119)
    at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1716)
    at org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:347)

By project limitations, I'm not using spring or nothing similar to configure the Hibernate and create the session.

Is my mapping wrong?

Answer 1

Can you tell what data records you have in DB?

It seems the id's between different tables has same value, so when hibernate is trying to load an entity with a specific id and if another entity with same id is already present in memory then hibernate is complaining about this issue.

Answer 2

Additionally to @Chaitanya's answer check when using a persistence.xml that there exists also a mapping for that entity.