Solved override the equals method (which means we also need | Chegg.com
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Javarevisited: Overriding equals() and hashCode() method in Java and Hibernate
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Java on Twitter: "What is the contract between equals() and hashcode() in # Java ? @RafaDelNero https://t.co/UIbalFZfyP https://t.co/yOHDjUYgCx" / Twitter
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