Vaadin internationalization issue: java.util.MissingResourceException

Question

I'm pretty new to Vaadin framework and I'm trying to make an internationalized application. I'm using NetBeans and I have followed these steps:

1. Create a new Vaadin project with a single UI class with a single text field on it.
2. I went to Tools -> Internationalization -> Internationalization Wizard and have followed those steps to internationalize the UI class.

Pretty simple. But when I run the application I get this exception:

javax.servlet.ServletException: com.vaadin.server.ServiceException: java.util.MissingResourceException: Can't find bundle for base name com/mycompany/i18ntest/Bundle, locale es_AR
    com.vaadin.server.VaadinServlet.service(VaadinServlet.java:240)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)

The exception suggests Bundle.properties file can't be found but it's present in the same package than UI class:

MyVaadinUI.java

package com.mycompany.i18ntest;

import javax.servlet.annotation.WebServlet;
import com.vaadin.annotations.Theme;
import com.vaadin.annotations.VaadinServletConfiguration;
import com.vaadin.server.VaadinRequest;
import com.vaadin.server.VaadinServlet;
import com.vaadin.ui.FormLayout;
import com.vaadin.ui.TextField;
import com.vaadin.ui.UI;
import java.util.ResourceBundle;

@Theme("mytheme")
@SuppressWarnings("serial")
public class MyVaadinUI extends UI {

    private final ResourceBundle bundle = ResourceBundle.getBundle("com/mycompany/i18ntest/Bundle");

    @WebServlet(value = "/*", asyncSupported = true)
    @VaadinServletConfiguration(productionMode = false, ui = MyVaadinUI.class
                               , widgetset = "com.mycompany.i18ntest.AppWidgetSet")
    public static class Servlet extends VaadinServlet {
    }

    @Override
    protected void init(VaadinRequest request) {
        TextField textField = new TextField(bundle.getString("MyVaadinUI.textField.caption"));
        textField.setRequired(true);
        textField.setRequiredError(bundle.getString("MyVaadinUI.textField.requiredError"));

        final FormLayout layout = new FormLayout(textField);
        layout.setMargin(true);
        setContent(layout);       
    }
}

Bundle.properties

MyVaadinUI.textField.caption = User
MyVaadinUI.textField.requiredError = Please input your user name here

---

Additionaly I've tried re-naming the .properties file to Bundle_es_AR.properties because my browser's default language is spanish (es) Argentina (AR), but no luck, still getting the exception.

Answer 1

Thanks to @AndréSchild comment (thank you) I realized the WAR file wasn't including Bundle.properties. After doing some Google search I have found how to include resources to Maven project by editing pom.xml file in this article. It presents two different ways to solve my problem:

Place .properties file inside resources folder

By default, Maven will look for your project's resources under src/main/resources.

Project 
   |-- pom.xml
   `-- src
       `-- main
           `-- resources

This basically states that I could simply place Bundle.properties file inside resources folder and it will be included in WAR file.

This file will be located at the root of classpath so I have to do this change in MyVaadinUI.java class:

private final ResourceBundle bundle = ResourceBundle.getBundle("Bundle");

Add the folder as resource editing pom.xml file

If we want to add some resource which is not placed in src/main/resources folder we can edit pom.xml file adding a resource folder as follows:

<project>
 ...
 <build>
   ...
   <resources>
     <resource>
       <directory>[our folder here]</directory>
     </resource>
   </resources>
   ...
 </build>
 ...
</project>

So in my case I could do something like this:

<project>
 ...
 <build>
   ...
   <resources>
     <directory>src/main/java/com/mycompany/i18ntest</directory>
     <includes>
       <include>*.properties</include>
     </includes>
   </resources>
   ...
 </build>
 ...
</project>

When WAR file is generated it will include the content of the specified resource folder (in addition to /src/main/resources fodler content) at the root of classpath. Once again I have to do this change:

private final ResourceBundle bundle = ResourceBundle.getBundle("Bundle");

Note: despite NetBeans shows all files in the resource folder, only .properties files will be included in WAR file because of this filter:

     <includes>
       <include>*.properties</include>
     </includes>