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diff --git a/libjava/classpath/gnu/javax/security/auth/callback/AbstractCallbackHandler.java b/libjava/classpath/gnu/javax/security/auth/callback/AbstractCallbackHandler.java
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+++ b/libjava/classpath/gnu/javax/security/auth/callback/AbstractCallbackHandler.java
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+/* AbstractCallbackHandler.java -- 
+   Copyright (C) 2005, 2006  Free Software Foundation, Inc.
+
+This file is a part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or (at
+your option) any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
+USA
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version.  */
+
+
+package gnu.javax.security.auth.callback;
+
+import gnu.java.security.Engine;
+
+import java.io.IOException;
+import java.lang.reflect.InvocationTargetException;
+import java.util.PropertyResourceBundle;
+import java.util.ResourceBundle;
+
+import java.security.NoSuchAlgorithmException;
+import java.security.NoSuchProviderException;
+import java.security.Provider;
+import java.security.Security;
+
+import javax.security.auth.callback.Callback;
+import javax.security.auth.callback.CallbackHandler;
+import javax.security.auth.callback.ChoiceCallback;
+import javax.security.auth.callback.ConfirmationCallback;
+import javax.security.auth.callback.LanguageCallback;
+import javax.security.auth.callback.NameCallback;
+import javax.security.auth.callback.PasswordCallback;
+import javax.security.auth.callback.TextInputCallback;
+import javax.security.auth.callback.TextOutputCallback;
+import javax.security.auth.callback.UnsupportedCallbackException;
+
+public abstract class AbstractCallbackHandler implements CallbackHandler
+{
+
+  // Fields.
+  // -------------------------------------------------------------------------
+
+  private static final String SERVICE = "CallbackHandler";
+
+  protected final ResourceBundle messages;
+
+  private final String name;
+
+  // Constructors.
+  // -------------------------------------------------------------------------
+
+  protected AbstractCallbackHandler (final String name)
+  {
+    super();
+    messages = PropertyResourceBundle.getBundle("gnu/javax/security/auth/callback/MessagesBundle");
+    this.name = name;
+  }
+
+  // Class methods.
+  // -------------------------------------------------------------------------
+
+  public static CallbackHandler getInstance(String type)
+    throws NoSuchAlgorithmException
+  {
+    Provider[] p = Security.getProviders();
+    for (int i = 0; i < p.length; i++)
+      {
+        try
+          {
+            return getInstance(type, p[i]);
+          }
+        catch (NoSuchAlgorithmException ignored)
+          {
+          }
+      }
+    throw new NoSuchAlgorithmException(type);
+  }
+
+  public static CallbackHandler getInstance(String type, String provider)
+    throws NoSuchAlgorithmException, NoSuchProviderException
+  {
+    Provider p = Security.getProvider(provider);
+    if (p == null)
+      {
+        throw new NoSuchProviderException(provider);
+      }
+    return getInstance(type, p);
+  }
+
+  public static CallbackHandler getInstance(String type, Provider provider)
+    throws NoSuchAlgorithmException
+  {
+    try
+      {
+        return (CallbackHandler) Engine.getInstance(SERVICE, type, provider);
+      }
+    catch (InvocationTargetException ite)
+      {
+        Throwable cause = ite.getCause();
+        if (cause instanceof NoSuchAlgorithmException)
+          throw (NoSuchAlgorithmException) cause;
+        NoSuchAlgorithmException nsae = new NoSuchAlgorithmException(type);
+        if (cause != null)
+          nsae.initCause (cause);
+        throw nsae;
+      }
+    catch (ClassCastException cce)
+      {
+        NoSuchAlgorithmException nsae = new NoSuchAlgorithmException(type);
+        nsae.initCause (cce);
+        throw nsae;
+      }
+  }
+
+  // Instance methods.
+  // -------------------------------------------------------------------------
+
+  public void handle(Callback[] callbacks)
+    throws IOException, UnsupportedCallbackException
+  {
+    if (callbacks == null)
+      throw new NullPointerException();
+    for (int i = 0; i < callbacks.length; i++)
+      {
+        if (callbacks[i] == null)
+          continue;
+        if (callbacks[i] instanceof ChoiceCallback)
+          handleChoice((ChoiceCallback) callbacks[i]);
+        else if (callbacks[i] instanceof ConfirmationCallback)
+          handleConfirmation((ConfirmationCallback) callbacks[i]);
+        else if (callbacks[i] instanceof LanguageCallback)
+          handleLanguage((LanguageCallback) callbacks[i]);
+        else if (callbacks[i] instanceof NameCallback)
+          handleName((NameCallback) callbacks[i]);
+        else if (callbacks[i] instanceof PasswordCallback)
+          handlePassword((PasswordCallback) callbacks[i]);
+        else if (callbacks[i] instanceof TextInputCallback)
+          handleTextInput((TextInputCallback) callbacks[i]);
+        else if (callbacks[i] instanceof TextOutputCallback)
+          handleTextOutput((TextOutputCallback) callbacks[i]);
+        else
+          handleOther(callbacks[i]);
+      }
+  }
+
+  public final String getName ()
+  {
+    return name;
+  }
+
+  // Abstract methods.
+  // -------------------------------------------------------------------------
+
+  /**
+   * Handles a {@link ChoiceCallback}.
+   *
+   * @param callback The choice callback.
+   * @throws IOException If an I/O error occurs.
+   */
+  protected abstract void handleChoice(ChoiceCallback callback)
+    throws IOException;
+
+  /**
+   * Handles a {@link ConfirmationCallback}.
+   *
+   * @param callback The confirmation callback.
+   * @throws IOException If an I/O error occurs.
+   */
+  protected abstract void handleConfirmation(ConfirmationCallback callback)
+    throws IOException;
+
+  /**
+   * Handles a {@link LanguageCallback}.
+   *
+   * @param callback The language callback.
+   * @throws IOException If an I/O error occurs.
+   */
+  protected abstract void handleLanguage(LanguageCallback callback)
+    throws IOException;
+
+  /**
+   * Handles a {@link NameCallback}.
+   *
+   * @param callback The name callback.
+   * @throws IOException If an I/O error occurs.
+   */
+  protected abstract void handleName(NameCallback callback)
+    throws IOException;
+
+  /**
+   * Handles a {@link PasswordCallback}.
+   *
+   * @param callback The password callback.
+   * @throws IOException If an I/O error occurs.
+   */
+  protected abstract void handlePassword(PasswordCallback callback)
+    throws IOException;
+
+  /**
+   * Handles a {@link TextInputCallback}.
+   *
+   * @param callback The text input callback.
+   * @throws IOException If an I/O error occurs.
+   */
+  protected abstract void handleTextInput(TextInputCallback callback)
+    throws IOException;
+
+  /**
+   * Handles a {@link TextOutputCallback}.
+   *
+   * @param callback The text output callback.
+   * @throws IOException If an I/O error occurs.
+   */
+  protected abstract void handleTextOutput(TextOutputCallback callback)
+    throws IOException;
+
+  /**
+   * Handles an unknown callback. The default implementation simply throws
+   * an {@link UnsupportedCallbackException}.
+   *
+   * @param callback The callback to handle.
+   * @throws IOException If an I/O error occurs.
+   * @throws UnsupportedCallbackException If the specified callback is not
+   *   supported.
+   */
+  protected void handleOther(Callback callback)
+    throws IOException, UnsupportedCallbackException
+  {
+    throw new UnsupportedCallbackException(callback);
+  }
+}