Servlet Example

HarborServlet.java

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 '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