Jpa many to many relationship

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Jpa many to many relationship

I HAVE Employee, EmpSchedule, EmpSubstitution tables Employee

EMP_ID
NAME
PHONE

EmpSchedule

EMP_ID
Start_date
End_date

EmpSubstitution

EMP_ID
Start_date
End_id

All there tables 3 individual class. Employee table loaded from another system. CRUD operations only in EmpSchedule and EmpSubstitution table.Relationship between EmpSchedule and EmpSubstituion table is many to many. between these Employee table is association table. Now how to desing a java jpa classes, i wanted retrieve EmpSubstituion object from EmpSchedule object. When i try to get the EmpSubstituion object from EmpSchedule object it gives null.

Please help.

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