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Today's tutorial for Java programmers covers the use of @JoinColumn annotation in mapping tables. This annotation specifies the actual column to use for mapping in the entity that owns the relationship. When dealing with relationships like user and posts, @MappedBy is used to indicate which entity will handle the mapping. In a many-to-one relationship, mapping is done at that point, while in a one-to-many relationship, the entity that owns the relationship automatically creates the mapping. Marking an entity as @MappedBy tells it not to handle the mapping.
