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Using join in hibernate mapping

 
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I am learning to use a <join> in my mapping. Is there any sample mapping and source code which some can point me to?
 
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Thanks. I am also looking for code samples. My confusion is if I have one class representing 2 different tables, (eg) Employee and EmployeeDetails joined by emp_id, what will be setters/getters in the Employee class to persists details in both the tables? What if my employee details class has its own PK and emp_id is FK. How can this declaration be done?
 
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