Book Image

Mastering Hibernate

By : Ramin Rad, Koushik Srinivas Kothagal
Book Image

Mastering Hibernate

By: Ramin Rad, Koushik Srinivas Kothagal

Overview of this book

Hibernate has been so successful since its inception that it even influenced the Java Enterprise Edition specification in that the Java Persistence API was dramatically changed to do it the Hibernate way. Hibernate is the tool that solves the complex problem of Object Relational Mapping. It can be used in both Java Enterprise applications as well as .Net applications. Additionally, it can be used for both SQL and NoSQL data stores. Some developers learn the basics of Hibernate and hit the ground quickly. But when demands go beyond the basics, they take a reactive approach instead of learning the fundamentals and core concepts. However, the secret to success for any good developer is knowing and understanding the tools at your disposal. It’s time to learn about your tool to use it better This book first explores the internals of Hibernate by discussing what occurs inside a Hibernate session and how Entities are managed. Then, we cover core topics such as mapping, querying, caching, and we demonstrate how to use a wide range of very useful annotations. Additionally, you will learn how to create event listeners or interceptors utilizing the improved architecture in the latest version of Hibernate.
Table of Contents (16 chapters)

Statistical data types

Hibernate collects various data points to help you measure the usage and performance of your application. This includes data collected about the session, entities, collections, query, and cache. Here, we discuss how to obtain this data and what each set of data points means.

To instruct Hibernate to collect metrics, you first need to enable the generation of statistical data. You have already seen how this is done in Chapter 5, Hibernate Cache but, just in case you skipped ahead, all you need to do is add the following property to the session factory configuration:

<property name="hibernate.generate_statistics">true</property>        

Hibernate will then start collecting data points, however, be aware that this could slightly impact the performance of your application, since it now has to do more work. Later, we can see how you can enable and disable statistics data generation using JMX. You can also clear the statistics data and start over. For now, let's...