java - Hibernate String Primary Key with Annotation -

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I am trying to create a priority class with an annotation whose primary key is inserting the string, I will assign from Therefore there is no need for hibernate to generate value for it. I'm trying to do something like this: 

  @ id @ generatedValue (generator = "assigned") @ column (name = "ROLE_NAME", nullable = false) Private string role name ;   
 but throws exceptions with:  
  by reason: org.hibernate.AnnotationException: unknown Id.generator: specified   
 How do I configure a  string  primary key with annotations?   
 
 
 Since  roleName  is not auto-generated, @ generatedValue : "" ROLE_NAME ", nullable = false) Private string roles;

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