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# spring
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Stian N

04/06/2020, 8:41 AM
Is this article outdated? https://kotlinexpertise.com/hibernate-with-kotlin-spring-boot/ I found this article that was updated a couple of months ago, and it doesn't mention any if the issues from the first article. https://www.baeldung.com/kotlin-jpa Slack Conversation
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thanksforallthefish

04/06/2020, 8:52 AM
are you talking in particular about `data class`es? you should not use them (baeldung got it wrong there, and I think the other articles explains it correctly too) the guide pinned it this channel also “explains” that immutable classes don’t work well with jpa: https://spring.io/guides/tutorials/spring-boot-kotlin/#_persistence_with_jpa vlad mihalcea explains equals/hashcode too: https://vladmihalcea.com/how-to-implement-equals-and-hashcode-using-the-jpa-entity-identifier/
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Stian N

04/06/2020, 10:16 AM
Thanks 🙂
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