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Great - Got it to work. This should be documented on your site.

You also forgot to mention what I need to import in order to have the "On" object.

Maybe you can include something like this template on your getting started page.

  import org.rapidoid.http.fast.*;
  // wget https://repo.maven.apache.org/maven2/org/rapidoid/rapidoid-http-fast/5.0.7/rapidoid-http-fast-5.0.7.jar
  public class App 
  {
    public static void main (String[] args)
    {
      On.get ("/size").json ("msg", msg -> msg.length ());
    }
  }

Also needed would be a sample pom.xml file. I had a problem with java compiler version being older and unable to complie lambdas.

My sample pom.xml (feel free to use it if you like) is:

  <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.microservices.app</groupId>
    <artifactId>rest-app</artifactId>
    <packaging>jar</packaging>
    <version>1.0-SNAPSHOT</version>
    <name>rest-app</name>
    <url>http://maven.apache.org</url>
    <properties>
      <java.version>1.8</java.version>
      <maven.compiler.source>1.8</maven.compiler.source>
      <maven.compiler.target>1.8</maven.compiler.target>
    </properties>
    <build>
      <plugins>
        <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-assembly-plugin</artifactId>
          <version>2.6</version>
          <configuration>
            <descriptorRefs>
              <descriptorRef>jar-with-dependencies</descriptorRef>
            </descriptorRefs>
          </configuration>
          <executions>
            <execution>
              <id>assemble-all</id>
              <phase>package</phase>
              <goals>
                <goal>single</goal>
              </goals>
            </execution>
          </executions>
        </plugin>
      </plugins>
    </build>
    <dependencies>
      <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>3.8.1</version>
        <scope>test</scope>
      </dependency>
      <dependency>
        <groupId>org.rapidoid</groupId>
        <artifactId>rapidoid-web</artifactId>
        <version>5.0.5</version>
      </dependency>
    </dependencies>
  </project>

Then I can run the test service using:

  java -cp target/rest-app-1.0-SNAPSHOT-jar-with-dependencies.jar App