Using org.hibernate.id.UUIDHexGenerator which does not generate IETF RFC 4122 compliant UUID values;

项目部署，启动过程中有以下警告：

[WARN]: Using org.hibernate.id.UUIDHexGenerator which does not generate IETF RFC 4122 compliant UUID values; consider using org.hibernate.id.UUIDGenerator instead

查看项目中用户类的主键生成策略：

@GenericGenerator(name = "system-uuid", strategy = "uuid.hex")
@Id
@GeneratedValue(generator = "system-uuid")
@Column(name = "user_id")

public String getUserId() {
    return userId ;
}

经查询，Hibernate 3.6开始，如果有model的主键有uuid生成，就会报这个错误，采用最新的生成策略，改成下面的就会正常

@Id
    @Column(length = 32, nullable = false)
    @GeneratedValue(generator = "uuid2" )   //指定生成器名称
    @GenericGenerator(name = "uuid2", strategy = "org.hibernate.id.UUIDGenerator" )  //生成器名称，uuid生成类

XML配置：

原来的：

<id name="id" type="string">
       <column name="ID" length="32" />
       <generator class="uuid" />
   </id>

现在改变后的：

<id name="id" type="string">
            <column name="ID" length="36" />
            <generator class="uuid2" />
        </id>