Configuring message-bundle with UTF-8 encoded messages - jsf-2

Question

What I'm trying to achieve is UTF-8 encoded JSF validation and converter messages (message-bundle). Also, I would like custom resource bundle for labels, etc (resource-bundle).
I managed to create and use custom resource bundle successfully, but I have problem with defining message-bundle.
I have the following structure under src/ directory:
- com.example.i18n.resources
- FacesMsgs.properties
- FacesMsgs_de.properties
- UTF8FacesMsgs.java
- Msgs.properties
- Msgs_de.properties
- UTF8Msgs.java
Faces-config.xml snippet:
<application>
<message-bundle>com.example.i18n.resources.UTF8FacesMsgs</message-bundle>
<resource-bundle>
<base-name>com.example.i18n.resources.UTF8Msgs</base-name>
<var>msg</var>
</resource-bundle>
<locale-config>
<default-locale>de</default-locale>
</locale-config>
</application>
In my implementation I have followed the instructions given here:
Internationalization in JSF with UTF-8 encoded properties files
These are resulting classes:
public class ResourceBundleWrapper extends ResourceBundle {
public ResourceBundleWrapper(ResourceBundle parent) {
setParent(parent);
}
#Override
protected Object handleGetObject(String key) {
return parent.getObject(key);
}
#Override
public Enumeration<String> getKeys() {
return parent.getKeys();
}
}
EncodingControl.java
public class EncodingControl extends Control {
private String encoding;
private String extension;
public EncodingControl(String encoding, String extension) {
this.encoding = encoding;
this.extension = extension;
}
#Override
public ResourceBundle newBundle(String baseName, Locale locale, String format, ClassLoader loader, boolean reload)
throws IllegalAccessException, InstantiationException, IOException {
String bundleName = toBundleName(baseName, locale);
String resourceName = toResourceName(bundleName, extension);
ResourceBundle bundle = null;
InputStream stream = null;
if (reload) {
URL url = loader.getResource(resourceName);
if (url != null) {
URLConnection connection = url.openConnection();
if (connection != null) {
connection.setUseCaches(false);
stream = connection.getInputStream();
}
}
} else {
stream = loader.getResourceAsStream(resourceName);
}
if (stream != null) {
try {
bundle = new PropertyResourceBundle(new InputStreamReader(stream, encoding));
} finally {
stream.close();
}
}
return bundle;
}
}
UTF8FacesMsgs.java
public class UTF8FacesMsgs extends ResourceBundleWrapper {
public UTF8FacesMsgs() {
super(ResourceBundle.getBundle("com.example.i18n.resources.FacesMsgs",
FacesContext.getCurrentInstance().getViewRoot().getLocale(),
new EncodingControl("UTF-8", "properties"));
}
}
UTF8Msgs.java
public class UTF8Msgs extends ResourceBundleWrapper {
public UTF8Msgs() {
super(ResourceBundle.getBundle("com.example.i18n.resources.Msgs",
FacesContext.getCurrentInstance().getViewRoot().getLocale(),
new EncodingControl("UTF-8", "properties"));
}
}
Resulting behaviour:
resource-bundle configuration seems to be working without issue: default UTF8Msgs.java is used and all labels on the page are rendered successfully.
On the other hand, behaviour with message-bundle is quite different although everything is configured likewise: when validation fails (submiting the button triggers validation) I get MissingResourceException - the default UTF8FacesMsgs.java is not used and UTF8FacesMsgs_de.java is expected.
Behaviour with changes introduced:
When I configure faces-config.xml like this (directly using properties file, not java class):
<application>
<message-bundle>com.example.i18n.resources.FacesMsgs</message-bundle>
<resource-bundle>
<base-name>com.example.i18n.resources.UTF8Msgs</base-name>
<var>msg</var>
</resource-bundle>
<locale-config>
<default-locale>de</default-locale>
</locale-config>
</application>
and delete FacesMsgs_de.properties everything runs without issue. So - default properties file is used and default java file is not.
Does anybody know what is the problem with message-bundle configuration?