This utility API, adds support for NLS messages in the apache code. It is currently used by the lucene "New Flexible Query PArser".
Features:
Lazy loading of Message Strings
	public class MessagesTestBundle extends NLS {
	
	  private static final String BUNDLE_NAME = MessagesTestBundle.class.getName();
	
	  private MessagesTestBundle() {
	    // should never be instantiated
	  }
	
	  static {
	    // register all string ids with NLS class and initialize static string
	    // values
	    NLS.initializeMessages(BUNDLE_NAME, MessagesTestBundle.class);
	  }
	
	  // static string must match the strings in the property files.
	  public static String Q0001E_INVALID_SYNTAX;
	  public static String Q0004E_INVALID_SYNTAX_ESCAPE_UNICODE_TRUNCATION;
	
	  // this message is missing from the properties file
	  public static String Q0005E_MESSAGE_NOT_IN_BUNDLE;
	}
    // Create a message reference
    Message invalidSyntax = new MessageImpl(MessagesTestBundle.Q0001E_INVALID_SYNTAX, "XXX");
    
    // Do other stuff in the code...
    // when is time to display the message to the user or log the message on a file
    // the message is loaded from the correct bundle
    
    String message1 = invalidSyntax.getLocalizedMessage();
    String message2 = invalidSyntax.getLocalizedMessage(Locale.JAPANESE);
Normal loading of Message Strings
String message1 = NLS.getLocalizedMessage(MessagesTestBundle.Q0004E_INVALID_SYNTAX_ESCAPE_UNICODE_TRUNCATION); String message2 = NLS.getLocalizedMessage(MessagesTestBundle.Q0004E_INVALID_SYNTAX_ESCAPE_UNICODE_TRUNCATION, Locale.JAPANESE);
The org.apache.lucene.messages.TestNLS junit contains several other examples. The TestNLS java code is available from the Apache Lucene code repository.