HarborServlet.java

package org.harbor;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.jruby.embed.PathType;
import org.jruby.embed.ScriptingContainer;
import org.jruby.javasupport.JavaEmbedUtils.EvalUnit;

public class HarborServlet extends HttpServlet {
  
  private ScriptingContainer container;
  private HttpServlet servlet;
  
  @Override
  public void init() {
    String classpath = getServletContext().getRealPath("/WEB-INF/classes");
    List<String> loadPaths = Arrays.asList(classpath.split(File.pathSeparator));
    container = new ScriptingContainer();
    container.getProvider().setLoadPaths(loadPaths);
  
    container.runScriptlet("require 'pathname'; p Pathname.pwd");
    container.runScriptlet("require 'src/main/ruby/hello_world'");
    servlet = (HttpServlet) container.runScriptlet("HelloWorld.new");
  }
  
  protected void processRequest(HttpServletRequest request, HttpServletResponse response)
  throws ServletException, IOException {
    servlet.service(request, response);
  }
  
}

hello_world.rb

java_import javax.servlet
java_import javax.servlet.http

class HelloWorld < HttpServlet
  
  def do_get(request, response)
    response.writer.println "Hello World!"
  end
end

stacktrace.txt

[INFO] Started Jetty Server
#<Pathname:/Users/sam/src/sam/servlet-hello-world>
LoadError: no such file to load -- src/main/ruby/hello_world
  require at org/jruby/RubyKernel.java:1024
  require at jar:file:/Users/sam/src/sam/servlet-hello-world/target/servlet-hello-world-1.0/WEB-INF/lib/jruby-complete-1.7.0.preview2.jar!/META-INF/jruby.home/lib/ruby/shared/rubygems/custom_require.rb:36
   (root) at <script>:1