org.hibernate.AnnotationException: No identifier specified for entity

因为java bean没有定义主键而造成的错误，在主键的属性上加上@Id的注解

package net.viralpatel.hibernate;import javax.persistence.Column;import javax.persistence.Entity;import javax.persistence.Table; @Entity@Table(name="EMPLOYEE")public class Employee {     @Column(name="employee_id")    private Long employeeId;     @Column(name="firstname")    private String firstname;     @Column(name="lastname")    private String lastname;        //Getter and Setter methods}