Many to Many Mapping in JPA

In this example I am going to show you how we can implement Many to Many(@ManyToMany) relationship using JPA persistence API in Java. The Java Persistence API (JPA) is a Java specification for accessing, persisting, and managing data between Java objects / classes and a relational database. The JPA is used to reduce the burden of writing codes for relational object management, a programmer or developer follows the ‘JPA Provider’ framework, which allows easy interaction with database instance. The JPA being a Java framework a programmer also needs not to…

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Bidirectional Many-To-Many Relationship with Join Tables in Hibernate

In bidirectional association, we will have navigation in both direction, i.e, both side of the association will have the reference to the other side. The both side of the association will implement one of the collection interfaces, if it has the reference to the other entity. In many to many relationship, one multiple objects can have relationship with multiple target objects. Let’s consider CD and Artist. So multiple CDs can be written by multiple Artists or multiple Artists can write multiple CDs. So we will create three tables CD, CDArtist…

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Unidirectional Many-To-Many Relationship with Join Tables in Hibernate

In unidirectional association, we will have navigation only in one direction, i.e, only one side of the association will have the reference to the other side. The one side of the association will implement one of the collection interfaces, if it has the reference to the other entity. In many to many relationship, multiple target objects can have relationship with multiple source objects. Let’s consider CD and Artist. So only one Artist can write multiple CD or a CD can be written by multiple Artists. So we will create three…

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