diff --git a/mozilla/java/webclient/classes_spec/org/mozilla/webclient/BrowserControlImpl.java b/mozilla/java/webclient/classes_spec/org/mozilla/webclient/BrowserControlImpl.java
index fba69dc4441..2fe1bf1ce8a 100644
--- a/mozilla/java/webclient/classes_spec/org/mozilla/webclient/BrowserControlImpl.java
+++ b/mozilla/java/webclient/classes_spec/org/mozilla/webclient/BrowserControlImpl.java
@@ -137,6 +137,7 @@ void delete()
 
 static void appInitialize(String verifiedBinDirAbsolutePath) throws Exception 
 {
+    ParameterCheck.nonNull(verifiedBinDirAbsolutePath);
     if (null == wrapperFactory) {
         wrapperFactory = createWrapperFactory();
     }
@@ -283,7 +284,7 @@ public static void main(String [] args)
     Assert.setEnabled(true);
     Log.setApplicationName("BrowserControlImpl");
     Log.setApplicationVersion("0.0");
-    Log.setApplicationVersionDate("$Id: BrowserControlImpl.java,v 1.2 2000-03-13 18:41:46 edburns%acm.org Exp $");
+    Log.setApplicationVersionDate("$Id: BrowserControlImpl.java,v 1.3 2000-07-22 02:48:23 edburns%acm.org Exp $");
     
 }
 
diff --git a/mozilla/java/webclient/classes_spec/org/mozilla/webclient/wrapper_native/BookmarksImpl.java b/mozilla/java/webclient/classes_spec/org/mozilla/webclient/wrapper_native/BookmarksImpl.java
index 760eefa4bd9..87742b5a856 100644
--- a/mozilla/java/webclient/classes_spec/org/mozilla/webclient/wrapper_native/BookmarksImpl.java
+++ b/mozilla/java/webclient/classes_spec/org/mozilla/webclient/wrapper_native/BookmarksImpl.java
@@ -110,6 +110,7 @@ public void delete()
 public void addBookmark(BookmarkEntry mayBeNullParent, 
                         BookmarkEntry bookmark)
 {
+    ParameterCheck.nonNull(bookmark);
     myFactory.throwExceptionIfNotInitialized();
     
     if  (!(bookmark instanceof BookmarkEntryImpl)) {
@@ -160,6 +161,7 @@ public TreeModel getBookmarks() throws IllegalStateException
             
 public void removeBookmark(BookmarkEntry bookmark)
 {
+    ParameterCheck.nonNull(bookmark);
     myFactory.throwExceptionIfNotInitialized();
     Assert.assert(-1 != nativeWebShell);
     
@@ -183,6 +185,7 @@ public BookmarkEntry newBookmarkEntry(String url)
 
 public BookmarkEntry newBookmarkFolder(String name)
 {
+    ParameterCheck.nonNull(name);
     BookmarkEntry result = null;
     getBookmarks();
     int newNode;
@@ -222,7 +225,7 @@ public static void main(String [] args)
 
     Log.setApplicationName("BookmarksImpl");
     Log.setApplicationVersion("0.0");
-    Log.setApplicationVersionDate("$Id: BookmarksImpl.java,v 1.4 2000-05-23 21:06:11 ashuk%eng.sun.com Exp $");
+    Log.setApplicationVersionDate("$Id: BookmarksImpl.java,v 1.5 2000-07-22 02:48:25 edburns%acm.org Exp $");
 
     try {
         org.mozilla.webclient.BrowserControlFactory.setAppData(args[0]);
diff --git a/mozilla/java/webclient/classes_spec/org/mozilla/webclient/wrapper_native/CurrentPageImpl.java b/mozilla/java/webclient/classes_spec/org/mozilla/webclient/wrapper_native/CurrentPageImpl.java
index 5598d2181c1..3719ee026d3 100644
--- a/mozilla/java/webclient/classes_spec/org/mozilla/webclient/wrapper_native/CurrentPageImpl.java
+++ b/mozilla/java/webclient/classes_spec/org/mozilla/webclient/wrapper_native/CurrentPageImpl.java
@@ -100,6 +100,7 @@ public void copyCurrentSelectionToSystemClipboard()
             
 public void findInPage(String stringToFind, boolean forward, boolean matchCase)
 {
+    ParameterCheck.nonNull(stringToFind);
     myFactory.throwExceptionIfNotInitialized();
 
     synchronized(myBrowserControl) {
@@ -260,7 +261,7 @@ public static void main(String [] args)
     Assert.setEnabled(true);
     Log.setApplicationName("CurrentPageImpl");
     Log.setApplicationVersion("0.0");
-    Log.setApplicationVersionDate("$Id: CurrentPageImpl.java,v 1.7 2000-06-30 00:01:35 ashuk%eng.sun.com Exp $");
+    Log.setApplicationVersionDate("$Id: CurrentPageImpl.java,v 1.8 2000-07-22 02:48:25 edburns%acm.org Exp $");
     
 }
 
diff --git a/mozilla/java/webclient/classes_spec/org/mozilla/webclient/wrapper_native/EventRegistrationImpl.java b/mozilla/java/webclient/classes_spec/org/mozilla/webclient/wrapper_native/EventRegistrationImpl.java
index 667e63de97f..76ca29a9a15 100644
--- a/mozilla/java/webclient/classes_spec/org/mozilla/webclient/wrapper_native/EventRegistrationImpl.java
+++ b/mozilla/java/webclient/classes_spec/org/mozilla/webclient/wrapper_native/EventRegistrationImpl.java
@@ -111,6 +111,7 @@ public void delete()
 
 public void addDocumentLoadListener(DocumentLoadListener listener)
 {
+    ParameterCheck.nonNull(listener);
     myFactory.throwExceptionIfNotInitialized();
     Assert.assert(-1 != nativeWebShell);
     Assert.assert(null != nativeEventThread);
@@ -123,6 +124,7 @@ public void addDocumentLoadListener(DocumentLoadListener listener)
 
 public void removeDocumentLoadListener(DocumentLoadListener listener)
 {
+    ParameterCheck.nonNull(listener);
     myFactory.throwExceptionIfNotInitialized();
     Assert.assert(-1 != nativeWebShell);
     
@@ -134,6 +136,7 @@ public void removeDocumentLoadListener(DocumentLoadListener listener)
 
 public void addMouseListener(MouseListener listener)
 {
+    ParameterCheck.nonNull(listener);
     myFactory.throwExceptionIfNotInitialized();
     Assert.assert(-1 != nativeWebShell);
     Assert.assert(null != nativeEventThread);
@@ -154,6 +157,7 @@ public void addMouseListener(MouseListener listener)
 
 public void removeMouseListener(MouseListener listener)
 {
+    ParameterCheck.nonNull(listener);
     myFactory.throwExceptionIfNotInitialized();
     Assert.assert(-1 != nativeWebShell);
     
@@ -175,7 +179,7 @@ public static void main(String [] args)
 
     Log.setApplicationName("EventRegistrationImpl");
     Log.setApplicationVersion("0.0");
-    Log.setApplicationVersionDate("$Id: EventRegistrationImpl.java,v 1.6 2000-07-22 02:14:57 edburns%acm.org Exp $");
+    Log.setApplicationVersionDate("$Id: EventRegistrationImpl.java,v 1.7 2000-07-22 02:48:25 edburns%acm.org Exp $");
 
     try {
         org.mozilla.webclient.BrowserControlFactory.setAppData(args[0]);
diff --git a/mozilla/java/webclient/classes_spec/org/mozilla/webclient/wrapper_native/HistoryImpl.java b/mozilla/java/webclient/classes_spec/org/mozilla/webclient/wrapper_native/HistoryImpl.java
index bd7dec468eb..a5f4d2498c1 100644
--- a/mozilla/java/webclient/classes_spec/org/mozilla/webclient/wrapper_native/HistoryImpl.java
+++ b/mozilla/java/webclient/classes_spec/org/mozilla/webclient/wrapper_native/HistoryImpl.java
@@ -180,6 +180,7 @@ public HistoryEntry [] getHistory()
             
 public HistoryEntry getHistoryEntry(int historyIndex)
 {
+    ParameterCheck.noLessThan(historyIndex, 0);
     myFactory.throwExceptionIfNotInitialized();
     Assert.assert(-1 != nativeWebShell);
     HistoryEntry result = null;
@@ -207,6 +208,7 @@ public int getCurrentHistoryIndex()
 
 public void setCurrentHistoryIndex(int historyIndex)
 {
+    ParameterCheck.noLessThan(historyIndex, 0);
     myFactory.throwExceptionIfNotInitialized();
     Assert.assert(-1 != nativeWebShell);
     
@@ -229,6 +231,7 @@ public int getHistoryLength()
 
 public String getURLForIndex(int historyIndex)
 {
+    ParameterCheck.noLessThan(historyIndex, 0);
     myFactory.throwExceptionIfNotInitialized();
     Assert.assert(-1 != nativeWebShell);
     String result = null;
@@ -280,7 +283,7 @@ public static void main(String [] args)
     Assert.setEnabled(true);
     Log.setApplicationName("HistoryImpl");
     Log.setApplicationVersion("0.0");
-    Log.setApplicationVersionDate("$Id: HistoryImpl.java,v 1.3 2000-05-23 21:06:11 ashuk%eng.sun.com Exp $");
+    Log.setApplicationVersionDate("$Id: HistoryImpl.java,v 1.4 2000-07-22 02:48:25 edburns%acm.org Exp $");
     
 }
 
diff --git a/mozilla/java/webclient/classes_spec/org/mozilla/webclient/wrapper_native/NavigationImpl.java b/mozilla/java/webclient/classes_spec/org/mozilla/webclient/wrapper_native/NavigationImpl.java
index 14e64e22e61..78566645d17 100644
--- a/mozilla/java/webclient/classes_spec/org/mozilla/webclient/wrapper_native/NavigationImpl.java
+++ b/mozilla/java/webclient/classes_spec/org/mozilla/webclient/wrapper_native/NavigationImpl.java
@@ -75,6 +75,7 @@ public NavigationImpl(WrapperFactory yourFactory,
 
 public void loadURL(String absoluteURL)
 {
+    ParameterCheck.nonNull(absoluteURL);
     myFactory.throwExceptionIfNotInitialized();
     Assert.assert(-1 != nativeWebShell);
     
@@ -85,6 +86,7 @@ public void loadURL(String absoluteURL)
 
 public void refresh(long loadFlags)
 {
+    ParameterCheck.noLessThan(loadFlags, 0);
     myFactory.throwExceptionIfNotInitialized();
     Assert.assert(-1 != nativeWebShell);
     
@@ -125,7 +127,7 @@ public static void main(String [] args)
 
     Log.setApplicationName("NavigationImpl");
     Log.setApplicationVersion("0.0");
-    Log.setApplicationVersionDate("$Id: NavigationImpl.java,v 1.2 2000-03-09 23:22:52 edburns%acm.org Exp $");
+    Log.setApplicationVersionDate("$Id: NavigationImpl.java,v 1.3 2000-07-22 02:48:26 edburns%acm.org Exp $");
 
     try {
         org.mozilla.webclient.BrowserControlFactory.setAppData(args[0]);
diff --git a/mozilla/java/webclient/classes_spec/org/mozilla/webclient/wrapper_native/WindowControlImpl.java b/mozilla/java/webclient/classes_spec/org/mozilla/webclient/wrapper_native/WindowControlImpl.java
index 6593b6e0b8b..6c2b3e3c848 100644
--- a/mozilla/java/webclient/classes_spec/org/mozilla/webclient/wrapper_native/WindowControlImpl.java
+++ b/mozilla/java/webclient/classes_spec/org/mozilla/webclient/wrapper_native/WindowControlImpl.java
@@ -103,6 +103,7 @@ NativeEventThread getNativeEventThread()
 
 public void setBounds(Rectangle newBounds)
 {
+    ParameterCheck.nonNull(newBounds);
     myFactory.throwExceptionIfNotInitialized();
     Assert.assert(-1 != nativeWebShell);
     
@@ -114,6 +115,8 @@ public void setBounds(Rectangle newBounds)
 
 public void createWindow(int nativeWindow, Rectangle bounds)
 {
+    ParameterCheck.greaterThan(nativeWindow, 0);
+    ParameterCheck.nonNull(bounds);
     myFactory.throwExceptionIfNotInitialized();
 
     synchronized(myBrowserControl) {
@@ -242,7 +245,7 @@ public static void main(String [] args)
 
     Log.setApplicationName("WindowControlImpl");
     Log.setApplicationVersion("0.0");
-    Log.setApplicationVersionDate("$Id: WindowControlImpl.java,v 1.5 2000-07-07 18:49:08 edburns%acm.org Exp $");
+    Log.setApplicationVersionDate("$Id: WindowControlImpl.java,v 1.6 2000-07-22 02:48:26 edburns%acm.org Exp $");
 
     try {
         org.mozilla.webclient.BrowserControlFactory.setAppData(args[0]);