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Question

I am using Tomcat/10.1.16 on Ubuntu 24.04
My web.xml file defines a servlet :

  <!-- Servlets -->
   <servlet>
    <servlet-name>servlet_general</servlet-name>
    <servlet-class>packagedebate.server.Info_desde_servidorServiceImpl</servlet-class>
    <load-on-startup>0</load-on-startup>
  </servlet>

  <servlet-mapping>
      <servlet-name>servlet_general</servlet-name>
    <url-pattern>/Debate/url_a_servlet_general</url-pattern> 
  </servlet-mapping>

GWT 2.11 compiles my /client/java files to a js file that eventually calls https://www.myweb.com/tomcat_app/Debate/url_a_servlet_general

My apache2.conf contains :

JkMount /tomcat_app* worker1
JkMount /tomcat_app*/* worker1

My worker.properties files contains :

worker.list=worker1
worker.worker1.type=ajp13
worker.worker1.host=localhost
worker.worker1.port=8009
worker.worker1.secret=password

My /etc/tomcat10/server.xml file contains

    <Connector protocol="AJP/1.3"
               address="::1"
               secretRequired="true"
               secret="password"
               port="8009"
               redirectPort="8081"  />
<Engine name="Catalina" defaultHost="localhost" jvmRoute="worker1">

The servlet is defined in my server side java file :

public class Info_desde_servidorServiceImpl extends RemoteServiceServlet implements info_desde_servidorService {
    
...

public void init() {

    System.out.println("I see this in catalina.out");
    
}


@Override
public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws IOException, ServletException {
   response.setContentType("text/html;charset=UTF-8");
   PrintWriter out = response.getWriter();
   try {
      out.println("<!DOCTYPE html>");
      out.println("<html><head>");
      out.println("<meta http-equiv='Content-Type' content='text/html; charset=UTF-8'>");
      out.println("<title>To the world</title></head>");
      out.println("<body>");
      out.println("<h1>Hello world</h1>");
      out.println("<p>Request URI: " + request.getRequestURI() + "</p>");
      out.println("<p>PathInfo: " + request.getPathInfo() + "</p>");
      out.println("<p>Remote Address: " + request.getRemoteAddr() + "</p>");
      out.println("</body>");
      out.println("</html>");
   } finally {
      out.close();  // Always close the output writer
   }
}
Public Boolean a_useful_method_accessed_by_client(int sent_by_client) {
    return true;
}

The extended RemoteServiceServlet is com.google.gwt.user.server.rpc.jakarta.RemoteServiceServlet

On client side, the interface info_desde_servidorService contains the list of methods:

@RemoteServiceRelativePath("url_a_servlet_general") 
public interface info_desde_servidorService extends RemoteService {
a_useful_method_accessed_by_client(int sent_by_client)throws DelistedException;
...

The servlet is initiated correctly (init is ran)

When I access https://www.myweb.com/tomcat_app/Debate/url_a_servlet_general

I am expecting to see “Hello world”.

Then, the client js methods (created by GWT) should be able to access the other methods of class Info_desde_servidorServiceImpl and exchange information client-server.

This setup has been working during years on my old server using tomcat9 instead of tomcat10, and javax instead of jakarta.

But on the new server (tomcat10 + jakarta) when I access “https://www.myweb.com/tomcat_app/Debate/url_a_servlet_general” the browser downloads a json file containing the line:

"//OK[0,1,["java.util.Vector/3057315478"],0,7]".

When the client (js file) tries to call a_useful_method_accessed_by_client method of Info_desde_servidorServiceImpl, the browser pops up the following message:

mywebsite says:
Error:  from info_desde_servidorService_Proxy.a_useful_method_accessed_by_client

I tried to be as detailled as possible. It is apparently not a ssl issue.

I do not know why the error mentions “info_desde_servidorService_Proxy” (not a text in my code). The “//OK” is not a text in my code either.

catalina.out does not report anything. Tomcat log files does not show any revelant information.

Any suggestion to track this error would be appreciated.

Should I downgrade to tomcat9? If yes, why did it not work?

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Danh mục

Browser downloads a json file when connecting to com.google.gwt.user.server.rpc.jakarta.RemoteServiceServlet