quarkus-hibernate-batch-fetch-reproducer

A reproducer to show that batch-fetching does not work as expected in Quarkus while it works in a pure Hibernate setup. It seems that any database query executed after the one that loads the entity makes the entity no longer eligible for batch fetching of lazy associations or element collections.

Run the tests through mvn test and watch the console output. The ExampleEntityQuarkusTest will fetch the anElementCollection of each ExampleEntity individually, while the ExampleEntityStandaloneTest will fetch all in one batch.

This project uses Quarkus, the Supersonic Subatomic Java Framework.

If you want to learn more about Quarkus, please visit its website: https://quarkus.io/ .

Running the application in dev mode

You can run your application in dev mode that enables live coding using:

./mvnw compile quarkus:dev

NOTE: Quarkus now ships with a Dev UI, which is available in dev mode only at http://localhost:8080/q/dev/.

Packaging and running the application

The application can be packaged using:

./mvnw package

It produces the quarkus-run.jar file in the target/quarkus-app/ directory. Be aware that it’s not an über-jar as the dependencies are copied into the target/quarkus-app/lib/ directory.

The application is now runnable using java -jar target/quarkus-app/quarkus-run.jar.

If you want to build an über-jar, execute the following command:

./mvnw package -Dquarkus.package.jar.type=uber-jar

The application, packaged as an über-jar, is now runnable using java -jar target/*-runner.jar.

Creating a native executable

You can create a native executable using:

./mvnw package -Dnative

Or, if you don't have GraalVM installed, you can run the native executable build in a container using:

./mvnw package -Dnative -Dquarkus.native.container-build=true

You can then execute your native executable with: ./target/quarkus-hibernate-batch-fetch-reproducer-1.0.0-SNAPSHOT-runner

If you want to learn more about building native executables, please consult https://quarkus.io/guides/maven-tooling.

Related Guides

• Hibernate ORM (guide): Define your persistent model with Hibernate ORM and Jakarta Persistence
• JDBC Driver - H2 (guide): Connect to the H2 database via JDBC
• YAML Configuration (guide): Use YAML to configure your Quarkus application

Provided Code

YAML Config

Configure your application with YAML

Related guide section...

The Quarkus application configuration is located in src/main/resources/application.yml.

Hibernate ORM

Create your first JPA entity

Related guide section...