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JPA Pitfalls (14): EntityManager.persist and Transactions

5. October 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 result of EntityManager.persist inside and outside of a transaction.

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JPA Pitfalls (13): EntityManager.merge Result

5. October 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 a common error when using EntityManager.merge.

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JPA Pitfalls (12): Lazy Loading of Relationships in a Loop

5. September 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 a potential performance problem when loading relationships in a loop.

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JPA Pitfalls (11): Iteration / Sorting in Memory or in DB

5. September 20205. September 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 a potential problem when filtering in memory instead of DB.

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JPA Pitfalls (10): Query Flush Mode

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 JPQL queries with respect of the query flush mode.

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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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