Quarkus with Vertx and RxJava2 imports yields NoClassDefFoundError - rx-java2

Question

I'm attempting to follow the basic examples on quarkus.io regarding using Vert.x. While attempting to use RxJava instead of the Axle API, I get a runtime error:
Error handling 24416339-00a4-4898-8373-b5d905b39179-2, org.jboss.resteasy.spi.UnhandledException: java.lang.NoClassDefFoundError: Could not initialize class io.vertx.reactivex.ext.web.client.WebClient
My code for this class is as follows:
package io.blah.accountadminservice.client;
import javax.annotation.PostConstruct;
import javax.enterprise.context.ApplicationScoped;
import javax.inject.Inject;
import org.eclipse.microprofile.config.inject.ConfigProperty;
//import io.vertx.axle.core.Vertx;
//import io.vertx.axle.ext.web.client.WebClient;
import io.vertx.reactivex.core.Vertx;
import io.vertx.reactivex.ext.web.client.WebClient;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
#ApplicationScoped
public class VaultClient {
private static final Logger LOGGER = LoggerFactory.getLogger(VaultClient.class);
#Inject
Vertx vertx;
private WebClient client;
private String vaultToken;
#ConfigProperty(name = "vault.host")
private String vaultHost;
#ConfigProperty(name = "vault.port")
private String vaultPort;
#ConfigProperty(name = "vault.loginPath")
private String vaultLoginPath;
#PostConstruct
void initialize() {
this.client = WebClient.create(vertx); // this kills it
}
public void getVaultToken() {
}
}
When following the tutorial using the Axel API, I can build a web client. As soon switch to reactivex, these failures start happening.
My dependencies are:
<dependencies>
<dependency>
<groupId>io.quarkus</groupId>
<artifactId>quarkus-resteasy</artifactId>
</dependency>
<dependency>
<groupId>org.mockito</groupId>
<artifactId>mockito-core</artifactId>
<version>${mockito.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.mockito</groupId>
<artifactId>mockito-junit-jupiter</artifactId>
<version>${mockito.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>io.quarkus</groupId>
<artifactId>quarkus-junit5</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>io.rest-assured</groupId>
<artifactId>rest-assured</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>io.quarkus</groupId>
<artifactId>quarkus-vertx</artifactId>
</dependency>
<dependency>
<groupId>io.vertx</groupId>
<artifactId>vertx-rx-java2</artifactId>
<version>${vertx-version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
</dependency>
</dependencies>
vertx-version is set to 3.7.1 at the moment. Side note: I've noticed when using the rxjava2 import, it's not possible to import io.vertx.ext.web.client.WebClientOptions; I don't know if that's supposed to work or not.

Answer 1

You need to add the following dependency in your pom.xml file:
<dependency>
<groupId>io.vertx</groupId>
<artifactId>vertx-web-client</artifactId>
<version>3.7.1</version>
</dependency>
The version must match the version used in Quarkus.