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:

@GenericGenerator (name = "System-uuid", strategy = "Uuid.hex") @Id @generatedvalue (generator = "System-uuid") @Column ( Name = "user_id") public String getUserId () {return userId;}

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

@Id @column (length = +, Nullable = False) @GeneratedValue (generator = "Uuid2")   //Specify Generator name @genericgenerator (name = " Uuid2 ", strategy =" org.hibernate.id.UUIDGenerator ")  //Generator name, UUID Generation class

XML configuration:

The original:

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

Now after the change:

<id name= "id" type= "string" >            <column name= "id" length= "$"/> <generator            class= "Uuid2"/>        </id>