could not execute statement; sql [n/a]; constraint [null]; nested exception is org.hibernate.exception.constraintviolationexception: could not execute statement code example

Example: could not execute statement; sql [n/a]; constraint [null]; nested exception is org.hibernate.exception.constraintviolationexception: could not execute statement

@Entity
@Table(name = "bankuser")
public class User implements java.io.Serializable {

    /**
     * 
     */
    private static final long serialVersionUID = 6447416794596398975L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id", unique = true, nullable = false)
    private Long id;

    @Column(name = "firstname", length = 50)
    private String firstname;

    @Column(name = "lastname", length = 50)
    private String lastname;

    public User() {
    }

    public User(Long id) {
        this.id = id;
    }

    public User(Long id, String firstname, String lastname, String designation, Integer salary) {
        this.id = id;
        this.firstname = firstname;
        this.lastname = lastname;

    }

    public User(String firstname, String lastname, String designation, Integer salary) {
        this.firstname = firstname;
        this.lastname = lastname;
    }

    public Long getId() {
        return this.id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getFirstname() {
        return this.firstname;
    }

    public void setFirstname(String firstname) {
        this.firstname = firstname;
    }

    public String getLastname() {
        return this.lastname;
    }

    public void setLastname(String lastname) {
        this.lastname = lastname;
    }

    @Override
    public String toString() {
        StringBuffer sb = new StringBuffer();
        sb.append("Id: ").append(this.id).append(", firstName: ").append(this.firstname).append(", lastName: ")
                .append(this.lastname);
        return sb.toString();
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (id == null || obj == null || getClass() != obj.getClass())
            return false;
        User toCompare = (User) obj;
        return id.equals(toCompare.id);
    }

    @Override
    public int hashCode() {
        return id == null ? 0 : id.hashCode();
    }

}

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