How to use Apache Camel "direct" in quarkus camel - apache-camel

Question

I have added io.quarkus:quarkus-camel-core to my application, but the direct start does not work within native-image. If I run quarkus in JVM, then it works.
There are projects in Github (https://github.com/apache/camel-quarkus/tree/master/extensions/direct) that somehow indicate that there is an extension planned in future, but it is not officially supported.
How can I make it run with minimal effort, e.g. create own extension project only for direct. If I am adding the existing projects to my Maven pom, I am getting problems with the different Maven coordinates, and at the end the native build tells me that there are duplicates.
What would be a good way to make the "direct" statement from Camel run in quarkus?
By the way, the native build works, i.e. I get an executable, but the injection of the direct statement does not work:
"org.apache.camel.ResolveEndpointFailedException: Failed to resolve
endpoint: direct://init due to: No component found with scheme:
direct"
Sources:
REST endpoint:
#Path("/hello")
public class GreetingResource {
#GET
#Produces(MediaType.TEXT_PLAIN)
public String hello() {
ExchangeBuilder exchangeBuilder = new ExchangeBuilder(context);
Exchange out = template.send("direct:init", exchangeBuilder.build());
return out.getOut().toString();
}
CamelRouteBuilder:
public class CamelSyncRouteBuilder extends RouteBuilder {
static final String HTTP_ROUTE_ID = "http:camel";
static long[] times = new long[1];
#Override
public void configure() throws Exception {
from("direct:init").routeId(HTTP_ROUTE_ID)
.setHeader(MyOrderService.class.getName(), MyOrderService::new)
.setHeader(Filler.class.getName(), Filler::new).process(fill(Filler.class.getName(), "fill"))
.split(body().tokenize("#"), CamelSyncRouteBuilder.this::aggregate)
.process(stateless(MyOrderService.class.getName(), "handleOrder")).end().to("log:foo?level=OFF");
}
pom.xml:
<?xml version="1.0"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://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.sap.it.graal</groupId>
<artifactId>getting-started</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<surefire-plugin.version>2.22.0</surefire-plugin.version>
<maven.compiler.target>1.8</maven.compiler.target>
<maven.compiler.source>1.8</maven.compiler.source>
<quarkus.version>0.19.1</quarkus.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
</properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>io.quarkus</groupId>
<artifactId>quarkus-bom</artifactId>
<version>${quarkus.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>io.quarkus</groupId>
<artifactId>quarkus-resteasy</artifactId>
</dependency>
<dependency>
<groupId>io.quarkus</groupId>
<artifactId>quarkus-junit5</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>io.rest-assured</groupId>
<artifactId>rest-assured</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>io.quarkus</groupId>
<artifactId>quarkus-camel-core</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>io.quarkus</groupId>
<artifactId>quarkus-maven-plugin</artifactId>
<version>${quarkus.version}</version>
<executions>
<execution>
<goals>
<goal>build</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<version>${surefire-plugin.version}</version>
<configuration>
<systemProperties>
<java.util.logging.manager>org.jboss.logmanager.LogManager</java.util.logging.manager>
</systemProperties>
</configuration>
</plugin>
</plugins>
</build>
<profiles>
<profile>
<id>native</id>
<activation>
<property>
<name>native</name>
</property>
</activation>
<build>
<plugins>
<plugin>
<groupId>io.quarkus</groupId>
<artifactId>quarkus-maven-plugin</artifactId>
<version>${quarkus.version}</version>
<executions>
<execution>
<goals>
<goal>native-image</goal>
</goals>
<configuration>
<enableHttpUrlHandler>true</enableHttpUrlHandler>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-failsafe-plugin</artifactId>
<version>${surefire-plugin.version}</version>
<executions>
<execution>
<goals>
<goal>integration-test</goal>
<goal>verify</goal>
</goals>
<configuration>
<systemProperties>
<native.image.path>${project.build.directory}/${project.build.finalName}-runner</native.image.path>
</systemProperties>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</profile>
</profiles>
</project>

Answer 1

the direct component should work out of the box even without a dedicated extension, as example it is used to create the integration test for the jdbc component (https://github.com/apache/camel-quarkus/tree/master/integration-tests/jdbc).
Can you share more information about your project and set-up ?

Answer 2

I was facing the same problem because i didn't learn how exactly Camel works. As it said in logs - you have no Component that provides "direct" URI. So you have to add that Component. There is one in Camel Quarkus extensions:
<dependency>
<groupId>org.apache.camel.quarkus</groupId>
<artifactId>camel-quarkus-direct</artifactId>
</dependency>