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1. How to load resource bundle messages from DB in Java?
Can I load a resource bundle dynamically? Can I edit a resource bundle dynamically? It would be best if I can have such a logical resource bundle (i.e. located in context not as physical file). Related: How to load a resource bundle from a file resource? 
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  /*
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   * Copyright 1996-2005 Sun Microsystems, Inc.  All Rights Reserved.
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   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   *
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   * This code is free software; you can redistribute it and/or modify it
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   * under the terms of the GNU General Public License version 2 only, as
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   * published by the Free Software Foundation.  Sun designates this
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   * particular file as subject to the "Classpath" exception as provided
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   * by Sun in the LICENSE file that accompanied this code.
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  *
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  * This code is distributed in the hope that it will be useful, but WITHOUT
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  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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  * version 2 for more details (a copy is included in the LICENSE file that
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  * accompanied this code).
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  *
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  * You should have received a copy of the GNU General Public License version
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  * 2 along with this work; if not, write to the Free Software Foundation,
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  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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  *
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  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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  * CA 95054 USA or visit www.sun.com if you need additional information or
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  * have any questions.
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  */
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 /*
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  * (C) Copyright Taligent, Inc. 1996, 1997 - All Rights Reserved
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  * (C) Copyright IBM Corp. 1996 - 1998 - All Rights Reserved
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  *
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  * The original version of this source code and documentation
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  * is copyrighted and owned by Taligent, Inc., a wholly-owned
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  * subsidiary of IBM. These materials are provided under terms
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  * of a License Agreement between Taligent and Sun. This technology
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  * is protected by multiple US and International patents.
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  *
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  * This notice and attribution to Taligent may not be removed.
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  * Taligent is a registered trademark of Taligent, Inc.
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  *
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  */
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 package java.util;
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ListResourceBundle is an abstract subclass of ResourceBundle that manages resources for a locale in a convenient and easy to use list. See ResourceBundle for more information about resource bundles in general.

Subclasses must override getContents and provide an array, where each item in the array is a pair of objects. The first element of each pair is the key, which must be a String, and the second element is the value associated with that key.

The following example shows two members of a resource bundle family with the base name "MyResources". "MyResources" is the default member of the bundle family, and "MyResources_fr" is the French member. These members are based on ListResourceBundle (a related example shows how you can add a bundle to this family that's based on a properties file). The keys in this example are of the form "s1" etc. The actual keys are entirely up to your choice, so long as they are the same as the keys you use in your program to retrieve the objects from the bundle. Keys are case-sensitive. 


 public class MyResources extends ListResourceBundle {
     protected Object[][] getContents() {
         return new Object[][] = {
         // LOCALIZE THIS
             {"s1", "The disk \"{1}\" contains {0}."},  // MessageFormat pattern
             {"s2", "1"},                               // location of {0} in pattern
             {"s3", "My Disk"},                         // sample disk name
             {"s4", "no files"},                        // first ChoiceFormat choice
             {"s5", "one file"},                        // second ChoiceFormat choice
             {"s6", "{0,number} files"},                // third ChoiceFormat choice
             {"s7", "3 Mar 96"},                        // sample date
             {"s8", new Dimension(1,5)}                 // real object, not just string
         // END OF MATERIAL TO LOCALIZE
         };
     }
 }

 public class MyResources_fr extends ListResourceBundle {
     protected Object[][] getContents() {
         return new Object[][] = {
         // LOCALIZE THIS
             {"s1", "Le disque \"{1}\" {0}."},          // MessageFormat pattern
             {"s2", "1"},                               // location of {0} in pattern
             {"s3", "Mon disque"},                      // sample disk name
             {"s4", "ne contient pas de fichiers"},     // first ChoiceFormat choice
             {"s5", "contient un fichier"},             // second ChoiceFormat choice
             {"s6", "contient {0,number} fichiers"},    // third ChoiceFormat choice
             {"s7", "3 mars 1996"},                     // sample date
             {"s8", new Dimension(1,3)}                 // real object, not just string
         // END OF MATERIAL TO LOCALIZE
         };
     }
 }

Since:
JDK1.1
See also:
ResourceBundle
PropertyResourceBundle
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public abstract class ListResourceBundle extends ResourceBundle {
    
Sole constructor. (For invocation by subclass constructors, typically implicit.) 
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    public ListResourceBundle() {
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    }
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    // Implements java.util.ResourceBundle.handleGetObject; inherits javadoc specification.
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    public final Object handleGetObject(String key) {
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        // lazily load the lookup hashtable.
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        if ( == null) {
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            loadLookup();
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        }
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        if (key == null) {
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            throw new NullPointerException();
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        }
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        return .get(key); // this class ignores locales
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    }

    
Returns an Enumeration of the keys contained in this ResourceBundle and its parent bundles.

Returns:
an Enumeration of the keys contained in this ResourceBundle and its parent bundles.
See also:
ResourceBundle.keySet()
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    public Enumeration<String> getKeys() {
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        // lazily load the lookup hashtable.
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        if ( == null) {
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            loadLookup();
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        }
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        ResourceBundle parent = this.;
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        return new ResourceBundleEnumeration(.keySet(),
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                (parent != null) ? parent.getKeys() : null);
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    }

    
Returns a Set of the keys contained only in this ResourceBundle.

Returns:
a Set of the keys contained only in this ResourceBundle
Since:
1.6
See also:
ResourceBundle.keySet()
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    protected Set<String> handleKeySet() {
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        if ( == null) {
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            loadLookup();
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        }
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        return .keySet();
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    }

    
Returns an array in which each item is a pair of objects in an Object array. The first element of each pair is the key, which must be a String, and the second element is the value associated with that key. See the class description for details.

Returns:
an array of an Object array representing a key-value pair.
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    abstract protected Object[][] getContents();
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    // ==================privates====================
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We lazily load the lookup hashtable. This function does the loading. 
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    private synchronized void loadLookup() {
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        if ( != null)
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            return;
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        Object[][] contents = getContents();
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        HashMap<String,Object> temp = new HashMap<String,Object>(contents.length);
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        for (int i = 0; i < contents.length; ++i) {
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            // key must be non-null String, value must be non-null
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            String key = (String) contents[i][0];
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            Object value = contents[i][1];
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            if (key == null || value == null) {
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                throw new NullPointerException();
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            }
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            temp.put(key, value);
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        }
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         = temp;
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    }
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    private Map<String,Object> lookup = null;
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