Quarkus CDI not working when creating a library

I have two projects A and B in project B and i want to injcet a CDI bean from project A however, this fails due too

java.lang.RuntimeException: io.quarkus.builder.BuildException: Build failure: Build failed due to errors [error]: Build step io.quarkus.arc.deployment.ArcProcessor#validate threw an exception: jakarta.enterprise.inject.spi.DeploymentException: jakarta.enterprise.inject.UnsatisfiedResolutionException: Unsatisfied dependency for type test.xml.filereader and qualifiers [@Default] - java member: org.acme.hibernate.orm.XmlResource#fileReader - declared on CLASS bean [types=[org.acme.hibernate.orm.XmlResource, java.lang.Object], qualifiers=[@Default, @Any], target=org.acme.hibernate.orm.XmlResource]

Project A has a CDI bean like this

@Slf4j
@ApplicationScoped
public class FileReader {

    @Inject
    Configuration configuration;

    public void testCDIInject() {
    }
    
}

project B wants to use this


@Path("/test")
public class XmlResource {

  @Inject
  FileReader fileReader;

  @GET
  public String get() {
    fileReader.testCDIInject();
    return "asdf";
  }
}

for some reason i get the error above. why?

i install project A with mvn clean install -U

and have it in project Bs pom.xml

Solution

From the related Quarkus guide

By default, Quarkus will not discover CDI beans inside another module.

The best way to enable CDI bean discovery for a module in a multi-module project would be to include the jandex-maven-plugin, unless it is the main application module already configured with the quarkus-maven-plugin, in which case it will be indexed automatically.

In project A you should generate the jandex.idx like:

<?xml version="1.0"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"
         xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.example</groupId>
    <artifactId>project-a</artifactId>
    <version>1.0-SNAPSHOT</version>

<!-- dependencies and others... -->

    <build>
        <plugins>
            <plugin>
                <groupId>io.smallrye</groupId>
                <artifactId>jandex-maven-plugin</artifactId>
                <version>3.1.1</version>
                <executions>
                    <execution>
                        <id>make-index</id>
                        <goals>
                            <goal>jandex</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
<!-- Other plugin configurations e.q. quarkus-maven-plugin... -->

        </plugins>
    </build>


</project>

Now during project B build CDI bean which defined in project A will be available in project B. Just add project A as a dependency to project B

<?xml version="1.0"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"
         xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.example</groupId>
    <artifactId>project-b</artifactId>
    <version>1.0-SNAPSHOT</version>

<!-- properties and managed dependencies -->

    <dependencies>
        <dependency>
            <groupId>com.example</groupId>
            <artifactId>project-a</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>

        <!-- other  dependencies -->
    </dependencies>

    <!-- plugins, site configurations and so on -->
</project>