How to Resolve Jandex Indexing Issues for External Module Classes in Quarkus?

Jandex Indexing for External Module Classes in Quarkus

Background

In a multi-module Maven project structure, it's common for JAX-RS endpoints in one module to rely on classes defined in an external module. However, Quarkus may issue a warning indicating an inability to index these classes for reflection.

Solution

To resolve this issue and ensure proper indexing:

Option 1: Jandex Maven Plugin

• Add the Jandex Maven plugin to the pom.xml of the module containing the classes to be indexed.

• This executes a goal that generates the necessary Jandex index.

        <plugin>
          <groupId>io.smallrye</groupId>
          <artifactId>jandex-maven-plugin</artifactId>
          <version>3.1.2</version>
          <executions>
            <execution>
              <id>make-index</id>
              <goals>
                <goal>jandex</goal>
              </goals>
            </execution>
          </executions>
        </plugin>

  Option 2: Jandex Gradle Plugin (Gradle Only)

• Utilize the third-party Jandex Gradle plugin to generate the index.
• Configure the plugin in your Gradle script as per its GitHub repository guidelines.

Option 3: Empty META-INF/beans.xml

• Create an empty META-INF/beans.xml file in the src/main/resources directory of the external module.
• Quarkus will automatically index the module's classes.

Option 4: Quarkus Application Properties

• For external dependencies that cannot be modified, you can manually index them by adding entries to your application.properties file:

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

• Replace with an identifier of your choice for the dependency.

By implementing any of these options, you can ensure that the necessary classes are properly indexed and reflection can successfully operate on them.

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