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

Project deployment, the following warnings are available during startup:

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

To view the primary key generation strategy for the user class in your project:

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1. @GenericGenerator (name = "System-uuid", strategy = "Uuid.hex")
2. @Id
3. @GeneratedValue (generator = "System-uuid")
4. @Column (name = "user_id")
6. Public String getUserId () {
7. return userId;
8. }

After the query, Hibernate 3.6, if there is a model of the primary key has the UUID generation, will report this error, using the latest generation strategy, change to the following will be normal

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1. @Id
2. @Column (length = + , nullable = false)
3. @GeneratedValue (generator = "Uuid2") //Specify Generator name
4. @GenericGenerator (name = "Uuid2", strategy = "Org.hibernate.id.UUIDGenerator") //Generator name, uuid generation class

XML configuration:

The original:

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2. <ID name="id" type= "string">
4. <column name="ID" length=" /> "
6. <generator class="uuid" />
8. </ID>

Now after the change:

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2. <ID name="id" type= "string">
4. <column name="ID" length=" /> "
6. <generator class="Uuid2" />
8. </ID>

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