org.hibernate.mapping.BasicValue cannot be cast to class org.hibernate.mapping.ToOne

Issue

• The following mapping resulted in a ClassCastException:

    @Entity
    static class Loan {
        @Id
        @Column(name = "LOAN_ID")
        private Long id;

        @OneToMany(cascade = PERSIST, mappedBy = "exLoanId")
        private List<Extensions> extensions = new ArrayList<>();
    }

    @Entity
    static class Extensions  {
        @Id
        @Column(name = "EX_LOAN_ID")
        private Long exLoanId;
        @Id
        @Column(name = "EX_NO")
        private Long exNo;
        @Column(name = "EX_EXTENSION_DAYS")
        private Long exExtensionDays;
    }

• Following ERROR message is showing in log:

Caused by: java.lang.ClassCastException: class org.hibernate.mapping.BasicValue cannot be cast to class org.hibernate.mapping.ToOne (org.hibernate.mapping.BasicValue and org.hibernate.mapping.ToOne are in unnamed module of loader 'org.hibernate@6.2.13.Final-redhat-00001' @74e9b06d)

...