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This post says: Example: if an order has many line items and one of them is removed from the order, the removed line item is considered an orphan. If orphanRemoval is set to t...

In loops string builder is more efficient but in normal string manipulations isn't it better to not use them? even if there are 100 concat operations it is finally O(n) and co...

This is not actually an error. It tells you Hibernate was unable to locate hibernate.properties. (It seems you expect it to do. Where did you put the file?)

Is it better to always use non primitive types? Integer instead of int, etc...

Are you sure they are about orphanRemoval?

How did you find that? I wanna know.