Embedded Tomcat server starts but unable to connect via browser on mobile phone.

[LINUS FERNANDES <li...@gmail.com>]

I have set up an embedded Tomcat server program on Arch Linux on Termux
using OpenJDK version 12.

However, I am unable to connect to the server using the browser. The same
WAR file with a web.xml works fine on Jetty.

Could you point me in the right direction?

The Java class is as follows:

package launch;

import java.text.MessageFormat;
import java.util.logging.Logger;
import org.apache.catalina.Context;
import org.apache.catalina.LifecycleException;
import org.apache.catalina.WebResourceRoot;
import org.apache.catalina.startup.Tomcat;
import org.apache.catalina.webresources.DirResourceSet;
import org.apache.catalina.webresources.StandardRoot;

@SuppressWarnings("PMD.ShortClassName")
public final class Main {
  private static final Logger LOGGER =
Logger.getLogger(Main.class.getName());
  private static final String WORKING_DIR =
      System.getProperty("java.io.tmpdir") + "/webapps";

  private Main() {
    throw new IllegalStateException("Private constructor");
  }

  public static void main(String[] args) {
    try {

      Tomcat tomcat = new Tomcat();

      // The port that we should run on can be set into an environment
variable
      // Look for that variable and default to 8080 if it isn't there.
      String webPort = System.getenv("PORT");
      if (webPort == null || webPort.isEmpty()) {
        webPort = "8080";
      }
      System.out.println(webPort);
      tomcat.setSilent(false);
      tomcat.setPort(Integer.valueOf(webPort));
      tomcat.setBaseDir(WORKING_DIR);
      tomcat.getHost().setAppBase(WORKING_DIR);
      tomcat.getHost().setAutoDeploy(true);
      tomcat.getHost().setDeployOnStartup(true);


      System.out.println(System.getProperty("catalina.home"));
      System.out.println(System.getProperty("catalina.base"));

      String userDir = System.getProperty("user.dir");
      String webappDirLocation = userDir + "/dist/Webapps-2.0.0.war";


tomcat.getHost().getAppBaseFile().mkdir();
      // Ensure that the webapps directory exists

      Context appContext =
          tomcat.addWebapp(tomcat.getHost(), "/Webapp", webappDirLocation);
      appContext.setParentClassLoader(
          Thread.currentThread().getContextClassLoader());
      WebResourceRoot resources = new StandardRoot(appContext);
      resources.addPreResources(
          new DirResourceSet(resources, "/WEB-INF/classes", "", "/"));
      appContext.setResources(resources);
      tomcat.start();
      LOGGER.info(() -> {
        return MessageFormat.format("Deployed {0} as {1}",
                                    appContext.getBaseName(),
                                    appContext.getBaseName());
      });
      tomcat.getServer().await();
    } catch (LifecycleException lce) {
      System.err.println(lce);
    }
  }
}

The web.xml is as follows. It's probably irrelevant.

<?xml version="1.0" encoding="iso-8859-1"?>
<web-app xmlns=" http://java.sun.com/xml/ns/javaee "
         xmlns:xsi=" http://www.w3.org/2001/XMLSchema-instance "
         xsi:schemaLocation=" http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd "
         version="3.0">
  <servlet>
    <servlet-name>FirstServlet</servlet-name>
    <servlet-class>servlets.FirstServlet</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>DbServlet</servlet-name>
    <servlet-class>servlets.DbServlet</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>GetPreferences</servlet-name>
    <servlet-class>servlets.GetPreferences</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>Checkout</servlet-name>
    <servlet-class>servlets.Checkout</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>AdderServlet</servlet-name>
    <servlet-class>servlets.AdderServlet</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>PersonalServlet</servlet-name>
    <servlet-class>servlets.PersonalServlet</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>Selection</servlet-name>
    <servlet-class>servlets.Selection</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>ShowSum</servlet-name>
    <servlet-class>servlets.ShowSum</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>Weight</servlet-name>
    <servlet-class>servlets.Weight</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>FirstServlet</servlet-name>
    <url-pattern>/FirstServlet</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>Checkout</servlet-name>
    <url-pattern>/Checkout</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>DbServlet</servlet-name>
    <url-pattern>/DbServlet</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>PersonalServlet</servlet-name>
    <url-pattern>/PersonalServlet</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>AdderServlet</servlet-name>
    <url-pattern>/AdderServlet</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>GetPreferences</servlet-name>
    <url-pattern>/GetPreferences</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>Selection</servlet-name>
    <url-pattern>/Selection</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>ShowSum</servlet-name>
    <url-pattern>/ShowSum</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>Weight</servlet-name>
    <url-pattern>/Weight</url-pattern>
  </servlet-mapping>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
  </welcome-file-list>
</web-app>

The project is hosted at
https://github.com/Fernal73/LearnJava/tree/master/Webapps

Regards,
Linus Fernandes.

Re: Embedded Tomcat server starts but unable to connect via browser on mobile phone.

[Christopher Schultz <ch...@christopherschultz.net>]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Linus,

On 9/12/19 09:33, LINUS FERNANDES wrote:
> I have set up an embedded Tomcat server program on Arch Linux on
> Termux using OpenJDK version 12.

What version of Tomcat?

> However, I am unable to connect to the server using the browser.
> The same WAR file with a web.xml works fine on Jetty.
> 
> Could you point me in the right direction?

You are probably missing a call to Tomcat.getConnector() to create a
default connector.

https://stackoverflow.com/questions/48998387/code-works-with-embedded-ap
ache-tomcat-8-but-not-with-9-whats-changed/49011424#49011424

- -chris
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