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什么是javax.validationjava ee中的包,如何在JPA 2.0中使用它？我想通过@NotNull注释验证我的Enity .我的JPA实现是Hibernate:

public class Employee implements Serializable , EmployeeDetail {
    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue
    private int id;

    private String name;

    private long salary;
    ...