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>Using org.hibernate.id.UUIDHexGenerator which does not generate IETF RFC 4122 compliant UUID values;
原文：http://blog.csdn.net/shanhuhau/article/details/38224619