The best way to fetch a Spring Data JPA DTO Projection
Imagine having a tool that can automatically detect JPA and Hibernate performance issues. Wouldn’t that be just awesome?
Well, Hypersistence Optimizer is that tool! And it works with Spring Boot, Spring Framework, Jakarta EE, Java EE, Quarkus, or Play Framework.
So, enjoy spending your time on the things you love rather than fixing performance issues in your production system on a Saturday night!
Introduction
In this article, I’m going to show you what is the best way to fetch a Spring Data JPA DTO Projection.
Apart from the basic use cases, we’re going to see how to fetch even hierarchical DTO structures using Spring Data JPA.
How to use different Java versions for main and test in Maven
Imagine having a tool that can automatically detect JPA and Hibernate performance issues. Wouldn’t that be just awesome?
Well, Hypersistence Optimizer is that tool! And it works with Spring Boot, Spring Framework, Jakarta EE, Java EE, Quarkus, or Play Framework.
So, enjoy spending your time on the things you love rather than fixing performance issues in your production system on a Saturday night!
Introduction
In this article, we are going to see how we can use different Java versions for the main and test folders in Maven so that you can run tests on a newer version of Java.
Testcontainers Database Integration Testing
Imagine having a tool that can automatically detect JPA and Hibernate performance issues. Wouldn’t that be just awesome?
Well, Hypersistence Optimizer is that tool! And it works with Spring Boot, Spring Framework, Jakarta EE, Java EE, Quarkus, or Play Framework.
So, enjoy spending your time on the things you love rather than fixing performance issues in your production system on a Saturday night!
Introduction
In this article, we are going to see how we can use Testcontainers for database integration testing.
If you are still using HSQLDB or H2 to test your Spring Boot application that runs on Oracle, SQL Server, PostgreSQL or MySQL in production, then you are better off switching to Testcontainers.
MySQL rewriteBatchedStatements configuration property
Imagine having a tool that can automatically detect JPA and Hibernate performance issues. Wouldn’t that be just awesome?
Well, Hypersistence Optimizer is that tool! And it works with Spring Boot, Spring Framework, Jakarta EE, Java EE, Quarkus, or Play Framework.
So, enjoy spending your time on the things you love rather than fixing performance issues in your production system on a Saturday night!
Introduction
In this article, we are going to see how MySQL rewriteBatchedStatements works when using JDBC, JPA, or Hibernate.
I first researched this MySQL configuration property when I was writing the batching chapter of my High-Performance Java Persistence book, and, back then, I discovered that this setting allows batching plain Statement by rewriting the SQL string that is sent to the database.
However, the MySQL 6 Connector/J documentation mentioned that:
for prepared statements, server-side prepared statements can not currently take advantage of this rewrite option
So, for a long time, I wrongly assumed this feature was not meant for batching JDBC prepared statements.
It was when I read the MySQL 8.0.30 Connector/J release notes that I realized the documentation had been misleading us:
The description for the connection property
rewriteBatchedStatementshas been corrected, removing the limitation that server-sided prepared statements could not take advantage of the rewrite option. (Bug #34022110)
So, apparently, the rewriteBatchedStatements was working with JDBC PreparedStatements, and, for this reason, I decided to test this functionality and write down my findings in this article.
The best way to map MonetaryAmount with JPA and Hibernate
Imagine having a tool that can automatically detect JPA and Hibernate performance issues. Wouldn’t that be just awesome?
Well, Hypersistence Optimizer is that tool! And it works with Spring Boot, Spring Framework, Jakarta EE, Java EE, Quarkus, or Play Framework.
So, enjoy spending your time on the things you love rather than fixing performance issues in your production system on a Saturday night!
Introduction
In this article, we are going to see what is the best way to map the MonetaryAmount object from Java Money and the Currency API when using JPA and Hibernate.
While the Java Money and Currency API define the specification, like the MonetaryAmount interface, the Moneta project provides a reference implementation for this API.
Maximum number of database connections
Imagine having a tool that can automatically detect JPA and Hibernate performance issues. Wouldn’t that be just awesome?
Well, Hypersistence Optimizer is that tool! And it works with Spring Boot, Spring Framework, Jakarta EE, Java EE, Quarkus, or Play Framework.
So, enjoy spending your time on the things you love rather than fixing performance issues in your production system on a Saturday night!
Introduction
Have you ever wondered what the maximum number of database connections provided by a given RDBMS is?
In this article, we are going to see what limits the number of database connections, no matter if you’re using Oracle, SQL Server, PostgreSQL, or MySQL.
Spring Data JPA MultipleBagFetchException
Imagine having a tool that can automatically detect JPA and Hibernate performance issues. Wouldn’t that be just awesome?
Well, Hypersistence Optimizer is that tool! And it works with Spring Boot, Spring Framework, Jakarta EE, Java EE, Quarkus, or Play Framework.
So, enjoy spending your time on the things you love rather than fixing performance issues in your production system on a Saturday night!
Introduction
In this article, I’m going to show you how to handle the MultipleBagFetchException thrown by Hibernate upon simultaneously fetching multiple collections with Spring Data JPA.
