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This is useful to be able to do. Typically you will want to declare a resource bundle in faces-config.xml to load it once for the application. You then refer to it from any JSF page that needs it.
However, you often want to also load messages from code. An example might be the generation of custom faces messages or other error messages generated by the code.
It is clearly therefore desirable to access the same message bundle that JSF has loaded, so that it is specified centrally, loaded once for the application, and reused by both JSF and Java.
This post here by Andy Gibson details how to do this. The code fragments are shown below, in case the link ever becomes broken:-
Resource File
firstName=First Name
lastName=Last Name
forgotPassword=Forgot Password?
usernameTaken={0} is already taken
faces-config.xml
<application>
<resource-bundle>
<base-name>org.fluttercode.resourcedemo.MessageResources</base-name>
<var>msgs</var>
</resource-bundle>
</application>
Class MessageProvider
public class MessageProvider {
private ResourceBundle bundle;
public ResourceBundle getBundle() {
if (bundle == null) {
FacesContext context = FacesContext.getCurrentInstance();
bundle = context.getApplication().getResourceBundle(context, “msgs”);
}
return bundle;
}public String getValue(String key) {
String result = null;
try {
result = getBundle().getString(key);
} catch (MissingResourceException e) {
result = “???” + key + “??? not found”;
}
return result;
}}
Backing Bean
@Named
@RequestScoped
public class SomeBean {public String getMessage() {
String msg = new MessageProvider().getValue(“someMessage”);
return MessageFormat.format(msg, “SomeValue”);
}
}
Example Code to generate a custom FacesMessage (from CoreJSF Edition 3, Page 332)
public void validateDate(ComponentSystemEvent event) {
UIComponent source = event.getComponent();
UIInput dayInput = (UIInput) source.findComponent(“day”);
UIInput monthInput = (UIInput) source.findComponent(“month”);
UIInput yearInput = (UIInput) source.findComponent(“year”);
int d = ((Integer) dayInput.getLocalValue()).intValue();
int m = ((Integer) monthInput.getLocalValue()).intValue();
int y = ((Integer) yearInput.getLocalValue()).intValue();if (!isValidDate(d, m, y)) {
FacesMessage message = com.corejsf.util.Messages.getMessage(
“com.corejsf.messages”, “invalidDate”, null);
message.setSeverity(FacesMessage.SEVERITY_ERROR);
FacesContext context = FacesContext.getCurrentInstance();
context.addMessage(source.getClientId(), message);
context.renderResponse();
}}
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