Internationalization / overriding Vaadin messages

Hi,

Is there some way to internationalize or override Vaadin messages ? (e.g. "Communication Problem. Take note of any unsaved data, and click here to continue.")

Thanks in advance.
Jerry - Brazil

Yeah, just override the static method getSystemMessages() from Application.

Thanks for the ideas, I'll be using some suitable variant of this!

Risto Yrjänä: Yeah, just override the static method getSystemMessages() from Application.

Override static method? Joking?

Jean-François, you approach is clear, but I still don't understand, how the messages get into GUI. One need to override com.vaadin.terminal.gwt.server.AbstractApplicationServlet#getSystemMessages() (e.g. by extending com.vaadin.terminal.gwt.server.ApplicationServlet).

See ticket#4127.

Your application indeed needs to implement getSystemMessages. See the LocalizedApplication.java file in the zip I created as an example. The following comment is from the source for Application

/**
     * Gets the SystemMessages for this application. SystemMessages are used to
     * notify the user of various critical situations that can occur, such as
     * session expiration, client/server out of sync, and internal server error.
     * 
     * You can customize the messages by "overriding" this method and returning
     * {@link CustomizedSystemMessages}. To "override" this method, re-implement
     * this method in your application (the class that extends
     * {@link Application}). Even though overriding static methods is not
     * possible in Java, Vaadin selects to call the static method from the
     * subclass instead of the original {@link #getSystemMessages()} if such a
     * method exists.
     * 
     * @return the SystemMessages for this application
     */

So when the application fires up, it gets the localized messages when it calls getSystemMessages().

As to where the messages are defined, the class Messages.java uses standard Java resource bundles. In the example code, you see that the bundle is called "i18n.messages". This means that I have a directory i18n in my structure (under maven, java/resources/i18n ; under regular eclipse, src/i18n). In the i18n directory there are files called
messages.properties
messages_en.properties
messages_fr.properties
(and so on). This is described in the Java documentation for ResourceBundle.

There are also some messages that seems to be hard-coded, eg.

"Invalid status code 0 (server down?)"

That seems to be coded in com.vaadin.terminal.gwt.client.ApplicationConnection class:

...
                        switch (statusCode) {
                        case 0:
                            showCommunicationError("Invalid status code 0 (server down?)");
                            endRequest();
                            return;

...

How can I localize this or get rid of it?

There are also some messages that seems to be hard-coded, eg.

"Invalid status code 0 (server down?)"

We have the same problem with hardcoded messages in ApplicationConnection class. Can anybody give us a hint?

Ann K:

There are also some messages that seems to be hard-coded, eg.

"Invalid status code 0 (server down?)"

We have the same problem with hardcoded messages in ApplicationConnection class. Can anybody give us a hint?

Answered (and ticket created) in this thread.