How to create Many to Many relationship in JPA

Two entities within Many to many relationships are associated with a junk table. There is no side that must be an owner side or inverse side, meaning that any sider can be an owner side. 

@JoinTable defines an owner side; MappedBy defines the inverse side. By this way, both entities are acknowledged to be associated in a many-to-many relationship.

Owner side: 

Inverse side: 

And it generates a junk table in the database