<!-- Mapping for user -->
   <one-to-many name="job" mapped-by="user" target-entity="domain.job" fetch="LAZY" access="FIELD" />
   
   <!-- mapping on the job -->
   <many-to-one name="admin">
      <join-column name="userId" />
   </many-to-one>
   
   <many-to-one name="client">
      <join-column name="userId" />
   </many-to-one>
   
   <many-to-one name="worker">
      <join-column name="userId" />
   </many-to-one/>
   
   <!-- POJOs -->
   class User{
   
        private int userId;
        private Job job;
      
       //rest of the code  . . .
   }
   
   class Job {
      private int jobId;
      private User admin;
      private User client;
      private User worker;
      
      //rest of the code . . .
   }

   
   <many-to-one name="admin">
      <join-column name="admin_id" />
   </many-to-one>
   
   <many-to-one name="client">
      <join-column name="client_id" />
   </many-to-one>
   
   <many-to-one name="worker">
      <join-column name="worker_id" />
   </many-to-one/>