How to resolve the Jandex indexing warning for external module classes in Quarkus?

How to Address the Jandex Indexing Warning for External Module Classes in Quarkus

When integrating classes from external modules into your Quarkus application, you may encounter a warning stating that the classes are not registered in the Jandex index. This warning can arise when the external module contains CDI beans or entities that need to be indexed by Quarkus.

Understanding the Jandex Index

Quarkus uses the Jandex index to optimize the reflection process and enhance performance. By indexing classes, Quarkus can detect and utilize the presence of annotations, such as @Entity or @ApplicationScoped, without having to perform expensive runtime reflection.

Solutions to Index External Module Classes

To resolve the warning and ensure proper indexing of external module classes, you have several options:

1. Using the Jandex Maven Plugin

For Maven-based projects, install the Jandex Maven plugin into the external module's pom.xml. This plugin will generate a Jandex index during the build process, ensuring that the necessary classes are included.

</p>
<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><build>
  <plugins>
    <plugin>
      <groupId>io.smallrye</groupId>
      <artifactId>jandex-maven-plugin</artifactId>
      <executions>
        <execution>
          <goals>
            <goal>jandex</goal>
          </goals>
        </execution>
      </executions>
    </plugin>
  </plugins>
</build>

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2. Empty META-INF/beans.xml

Adding an empty META-INF/beans.xml file in the external module will also trigger indexing by Quarkus itself.

3. Defining Index Dependencies

If modifying the external module is not feasible, you can define index dependencies in your application.properties as follows:

<br>quarkus.index-dependency.<name>.group-id=<br>quarkus.index-dependency.<name>.artifact-id=<br>quarkus.index-dependency.<name>.classifier=(optional)<br>

Replace with an identifier for the dependency. This approach allows you to index external dependencies without requiring any modifications to them.

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