Tuning Spring Petclinic JPA and Hibernate configuration with Hypersistence Optimizer

Introduction In this article, we are going to see how we can tune the performance of the Spring Petclinic application using Hypersistence Optimizer. Now, while you can manually analyze your data access layer to make sure that JPA and Hibernate are properly configured, it’s much better if you can automate this task. That’s because new entities might be mapped in the future, and you want to make sure that the same performance-specific rules are consistently applied on every commit. Hypersistence Optimizer allows you to automatically detect JPA and Hibernate issues during development,… Read More

How to intercept and modify SQL queries with the Hibernate StatementInspector

Introduction A very useful, yet lesser-known, Hibernate feature is the ability to intercept and modify any auto-generated SQL statement using the Hibernate StatementInspector utility. In this article, we are going to see how the Hibernate StatementInspector mechanism works.

How to detect HHH000104 issues with hibernate.query.fail_on_pagination_over_collection_fetch

Introduction Recently, I noticed the hibernate.query.fail_on_pagination_over_collection_fetch configuration property that was introduced in Hibernate 5.2, and I had absolutely no idea it can be used to prevent the HHH000104 Hibernate issues. As previously explained, if you want to overcome the “HHH000104: firstResult/maxResults specified with collection fetch; applying in memory!” issue, you have to either use 2 queries or a window function to fetch and limit the number of parent records while making sure you always fetch all their associated child entities. Even if the HHH000104 issue is logged as a warning message, it… Read More

How to expose Hibernate Statistics via JMX

Introduction As already explained, Hibernate provides a very flexible statistics mechanism. The Hibernate metrics can be accessed either programmatically via the org.hibernate.stat.Statistics interface or via JMX (Java Management Extensions). In this article, you are going to see how you can expose the Hibernate statistics metrics using JMX.

A beginner’s guide to Hibernate Statistics

Introduction Hibernate provides a very powerful Statistics mechanism that, unfortunately, is lesser known. In this article, we are going to see how the Hibernate Statistics mechanism works, and how you can activate. While the Hibernate Statistics mechanism is not enabled by default, you will see that many applications can benefit from using it, especially when it comes to determining cache effectiveness.