Most of you already know about the standard way to implement equals and hashCode for a class. As an example lets consider a User class<\/p>\n
\npublic class User {\nprivate Long id;\nprivate String name;\nprivate String address;\n}\n<\/code>\n<\/pre>\n<\/a><\/p>\nIf we consider Id as unique identifier for logical equality of users then the equals and hashCode method can be written over “id”, as given below<\/p>\n
\n@Override\npublic int hashCode() {\nfinal int prime = 31;\nint result = 1;\nresult = prime * result + ((id == null) ? 0 : id.hashCode());\nreturn result;\n}\n\n\n@Override\npublic boolean equals(Object obj) {\nif (this == obj)\nreturn true;\nif (obj == null)\nreturn false;\nif (getClass() != obj.getClass())\nreturn false;\nUser other = (User) obj;\nif (id == null) {\nif (other.id != null)\nreturn false;\n} else if (!id.equals(other.id))\nreturn false;\nreturn true;\n}\n<\/code>\n<\/pre>\nNow lets assume User is an entity thats managed by hibernate and is lazily loaded. So actually you will be interacting with the proxy(HibernateProxy) of User and not the actual User class.<\/p>\n
Now in this the equals implementation of User class will fail. If we check for equality of normal instance of User class with the proxy instance of User the equals method will return false. The reason for failure is the class check i.e<\/p>\n
\nif (getClass() != obj.getClass())\nreturn false;\n<\/code>\n<\/pre>\nSince the class of Proxy user object is not User but a HibernateProxy class.<\/p>\n
To overcome this problem hibernate comes with a utility class HibernateProxyHelper which is used to get the actual class if the object passed to it is of type HibernateProzy. The above piece of code can be replaced with<\/p>\n
\nif ( HibernateProxyHelper.getClassWithoutInitializingProxy(obj) != getClass() ) {\nreturn false;\n}\n<\/code>\n<\/pre>\nAnother problem with the implementation of equals in case of proxy objects is we cannot directly access the fields i.e<\/p>\n
\nif (!id.equals(other.id))\nreturn false;\n<\/code>\n<\/pre>\nas proxy objects can access only the methods of the underlying object so instead of directly accessing the field we have to use the getter method<\/p>\n
\nif (!id.equals(other.getId()))\nreturn false;\n<\/code>\n<\/pre>\nSo the updated equals implemention that should work perfectly fine in case of proxy objects also will be as given below<\/p>\n
\npublic boolean equals(Object obj) {\nif (this == obj)\nreturn true;\nif (obj == null)\nreturn false;\nif ( HibernateProxyHelper.getClassWithoutInitializingProxy(obj) != getClass() ) {\nreturn false;\n}\nUser other = (User) obj;\nif (id == null) {\nif (other.getId() != null)\nreturn false;\n} else if (!id.equals(other.getId()))\nreturn false;\nreturn true;\n}\n<\/code>\n<\/pre>\n","protected":false},"excerpt":{"rendered":"Most of you already know about the standard way to implement equals and hashCode for a class. As an example lets consider a User class public class User { private Long id; private String name; private String address; } If we consider Id as unique identifier for logical equality of users then the equals and … Continue reading “Equals implementation for Lazy loaded objects in Hibernate”<\/span><\/a><\/p>\n","protected":false},"author":150552946,"featured_media":29900,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false},"version":2}},"categories":[1],"tags":[17907,2592186,114254396],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/opstree.com\/blog\/wp-content\/uploads\/2025\/11\/DevSecOps-1.jpg","jetpack_likes_enabled":true,"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/pfDBOm-7T","jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/opstree.com\/blog\/wp-json\/wp\/v2\/posts\/489"}],"collection":[{"href":"https:\/\/opstree.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/opstree.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/opstree.com\/blog\/wp-json\/wp\/v2\/users\/150552946"}],"replies":[{"embeddable":true,"href":"https:\/\/opstree.com\/blog\/wp-json\/wp\/v2\/comments?post=489"}],"version-history":[{"count":2,"href":"https:\/\/opstree.com\/blog\/wp-json\/wp\/v2\/posts\/489\/revisions"}],"predecessor-version":[{"id":852,"href":"https:\/\/opstree.com\/blog\/wp-json\/wp\/v2\/posts\/489\/revisions\/852"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/opstree.com\/blog\/wp-json\/wp\/v2\/media\/29900"}],"wp:attachment":[{"href":"https:\/\/opstree.com\/blog\/wp-json\/wp\/v2\/media?parent=489"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/opstree.com\/blog\/wp-json\/wp\/v2\/categories?post=489"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/opstree.com\/blog\/wp-json\/wp\/v2\/tags?post=489"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}