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JPA Pitfalls (9): UPDATE/DELETE and Persistence Context

21. June 2020 | Michael Bouschen

This blog article is part of a “series of blog articles” about common pitfalls using JPA and ways to avoid them. In this article, we describe bulk the effect of JPQL operations on the EntityManager cache.

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JPA Pitfalls (8): Navigation of Relationships

21. June 2020 | Michael Bouschen

This blog article is part of a “series of blog articles” about common pitfalls using JPA and ways to avoid them. In this article, we describe unexpected results of navigational JPQL queries.

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Co- and Contravariance in Kotlin From an Introductionary Domain Level Perspective

21. June 202022. June 2020 | tnfink

Covariance and contravariance are properties of type systems of programming languages. They can be pretty intimidating words for a software developer who just wants to implement user requirements. In this article I approach the meaning of these two properties in Kotlin from a domain level perspective. It was part of an internal small workshop on Kotlin.

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JPA Pitfalls (7): Null Parameter

12. May 202021. June 2020 | Michael Bouschen

This blog article is part of a “series of blog articles” about common pitfalls using JPA and ways to avoid them. In this article, we describe issues with using null parameter values.

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JPA Pitfalls (6): Query Result with Duplicates

11. May 202012. May 2020 | Michael Bouschen

This blog article is part of a “series of blog articles” about common pitfalls using JPA and ways to avoid them. In this article, we describe unexpected duplicates in the result of a JPQL query.

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JPA Pitfalls (5): Object-Relational Mapping and Inheritance

29. March 202030. March 2020 | Michael Bouschen

This blog article is part of a “series of blog articles” about common pitfalls using JPA and ways to avoid them. In this article, we describe possible performance impacts of JPA inheritance mapping strategies.

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JPA Pitfalls (4): Relationship Owner

21. March 2020 | Michael Bouschen

This blog article is part of a “series of blog articles” about common pitfalls using JPA and ways to avoid them. In this article, we describe issues with bidirectional relationships.

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JPA Pitfalls (3): Cascade Persist

21. March 2020 | Michael Bouschen

This blog article is part of a “series of blog articles” about common pitfalls using JPA and ways to avoid them. In this article, we describe issues of EM.persist with respect to relationships.

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JPA Pitfalls (2): List or Set Relationship

10. March 202010. March 2020 | Michael Bouschen

This blog article is part of a “series of blog articles” about common pitfalls using JPA and ways to avoid them. In this article, we describe the difference between a set or list relationship.

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