extension.java

public class Neo4jCdiExtension implements Extension {
   private static final String NEO4J_METRIC_NAME_PREFIX = "neo4j";
   void afterBeanDiscovery(@Observes AfterBeanDiscovery addEvent) {
       addEvent.addBean()
               .types(Driver.class)
               .qualifiers(Default.Literal.INSTANCE, Any.Literal.INSTANCE)
               .scope(ApplicationScoped.class)
               .name(Driver.class.getName())
               .beanClass(Driver.class)
               .createWith(creationContext -> {
                   org.eclipse.microprofile.config.Config config = ConfigProvider.getConfig();
                   Config helidonConfig = MpConfig.toHelidonConfig(config).get(NEO4J_METRIC_NAME_PREFIX);

                   ConfigValue<Neo4j> configValue = helidonConfig.as(Neo4j::create);
                   if (configValue.isPresent()) {
                       return configValue.get().driver();
                   }
                   throw new Neo4jException("There is no Neo4j driver configured in configuration under key 'neo4j");
               });
   }
}