Index: javax/swing/JFrame.java
===================================================================
RCS file: /cvsroot/classpath/classpath/javax/swing/JFrame.java,v
retrieving revision 1.23
diff -u -r1.23 JFrame.java
--- javax/swing/JFrame.java	17 Jun 2005 11:53:50 -0000	1.23
+++ javax/swing/JFrame.java	20 Jun 2005 15:26:53 -0000
@@ -331,8 +331,7 @@
    * When <code>EXIT_ON_CLOSE</code> is specified this method calls
    * <code>SecurityManager.checkExit(0)</code> which might throw a
    * <code>SecurityException</code>. When the specified operation is
-   * not one of the above a <code>IllegalArgumentException</code> is
-   * thrown.
+   * not one of the above use default HIDE_ON_CLOSE.
    */
   public void setDefaultCloseOperation(int operation)
   {
@@ -342,8 +341,8 @@
 
     if (operation != EXIT_ON_CLOSE && operation != DISPOSE_ON_CLOSE
         && operation != HIDE_ON_CLOSE && operation != DO_NOTHING_ON_CLOSE)
-      throw new IllegalArgumentException("operation = " + operation);
-
-    close_action = operation;
+      close_action = HIDE_ON_CLOSE;
+    else
+      close_action = operation;
   }
 }
Index: javax/swing/JInternalFrame.java
===================================================================
RCS file: /cvsroot/classpath/classpath/javax/swing/JInternalFrame.java,v
retrieving revision 1.17
diff -u -r1.17 JInternalFrame.java
--- javax/swing/JInternalFrame.java	17 Jun 2005 11:53:50 -0000	1.17
+++ javax/swing/JInternalFrame.java	20 Jun 2005 15:26:53 -0000
@@ -1297,19 +1297,20 @@
 
   /**
    * This method sets the action taken when this JInternalFrame is closed.
+   * Defaults to DISPOSE_ON_CLOSE if operation is not a legal value.
    *
    * @param operation One of DO_NOTHING_ON_CLOSE, HIDE_ON_CLOSE or
    *        DISPOSE_ON_CLOSE.
    *
-   * @throws Error If the given operation is not one of the allowed modes.
    */
   public void setDefaultCloseOperation(int operation)
   {
     if (operation != DO_NOTHING_ON_CLOSE
 	&& operation != HIDE_ON_CLOSE
         && operation != DISPOSE_ON_CLOSE)
-      throw new Error("Close operation must be one of DO_NOTHING_ON_CLOSE, HIDE_ON_CLOSE, or DISPOSE_ON_CLOSE");
-    defaultCloseOperation = operation;
+      defaultCloseOperation = DISPOSE_ON_CLOSE;
+    else
+      defaultCloseOperation = operation;
   }
 
   /**