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HI all.
Please explaine difference betwet this one-to-mane VS join table.
What advantage has first or second approach?

join is used when two tables share the same primary key.

join table between two tables using a primary key is a one-to-one relation (each row in table A have one and only one row with the same id in table B ).

So what is your question exactly? One-to-Many is a relation than can be achieved using a separate table, that is a join table, that keeps all references to the children for a given parent id. This approach often requires that the parent Object load the whole collection before attempting to modify it.

Another approach is to not use join table, and simply add an extra column, a foreign key, in the child table referering to the parent. So, in this case the relation is in fact managed by the child (instead of the parent as in the first approach). All the children of a Parent X is then translated to a query like this "returns all children that has the parent x".

Hibernate allows you to map a collection using one of these two methods. The first method must be used when the child does not know its parent, and the second method, when the child knows is parent, that is when the child has such method "child.getParent()".