--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/java/util/prefs/CommentsInXml.java	Thu Aug 13 15:01:18 2009 -0700
@@ -0,0 +1,60 @@
+/*
+ * Copyright 2009 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/*
+ * @test
+ * @bug 4619564
+ * @summary XMl Comments in Preferences File lead to ClassCastException
+ * @author kladko
+ */
+
+import java.io.*;
+import java.util.prefs.*;
+
+public class CommentsInXml {
+
+    public static void main(String[] argv) throws Exception {
+
+        ByteArrayOutputStream bos = new ByteArrayOutputStream();
+
+        bos.write(new String(
+            "<!DOCTYPE preferences SYSTEM                          " +
+            "\"http://java.sun.com/dtd/preferences.dtd\">          " +
+            "<preferences EXTERNAL_XML_VERSION=\"1.0\">            " +
+            "  <root type=\"user\">                                " +
+            "    <map>                                             " +
+            "    </map>                                            " +
+            "    <node name=\"hlrAgent\"> <!-- HLR Agent -->       " +
+            "      <map>                                           " +
+            "        <entry key=\"agentName\" value=\"HLRAgent\" />" +
+            "      </map>                                          " +
+            "    </node>                                           " +
+            "  </root>                                             " +
+            "</preferences>                                        "
+        ).getBytes());
+
+        Preferences ur = Preferences.userRoot();
+        ur.importPreferences(new ByteArrayInputStream(bos.toByteArray()));
+        ur.node("hlrAgent").removeNode(); // clean
+    }
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/java/util/prefs/ConflictInFlush.java	Thu Aug 13 15:01:18 2009 -0700
@@ -0,0 +1,49 @@
+/*
+ * Copyright 2009 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/*
+ * @test
+ * @bug 4703132
+ * @summary flush() throws an IllegalStateException on a removed node
+ * @author Sucheta Dambalkar
+ */
+
+import java.util.prefs.*;
+
+public final class ConflictInFlush{
+
+    public static void main(String args[]) {
+        Preferences root = Preferences.userRoot();
+        try {
+            Preferences node = root.node("1/2/3");
+            node.flush();
+            System.out.println("Node "+node+" has been created");
+            System.out.println("Removing node "+node);
+            node.removeNode();
+            node.flush();
+        }catch (BackingStoreException bse){
+            bse.printStackTrace();
+        }
+
+    }
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/java/util/prefs/ExportNode.java	Thu Aug 13 15:01:18 2009 -0700
@@ -0,0 +1,53 @@
+/*
+ * Copyright 2009 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+
+/*
+ * @test
+ * @bug 4387136 4947349
+ * @summary Due to a bug in XMLSupport.putPreferencesInXml(...),
+ *          node's keys would not get exported.
+ * @author Konstantin Kladko
+ */
+import java.util.prefs.*;
+import java.io.*;
+
+public class ExportNode {
+    public static void main(String[] args) throws
+                                            BackingStoreException, IOException {
+            Preferences N1 = Preferences.userRoot().node("ExportNodeTest1");
+            N1.put("ExportNodeTestName1","ExportNodeTestValue1");
+            Preferences N2 = N1.node("ExportNodeTest2");
+            N2.put("ExportNodeTestName2","ExportNodeTestValue2");
+            ByteArrayOutputStream exportStream = new ByteArrayOutputStream();
+            N2.exportNode(exportStream);
+
+            // Removal of preference node should always succeed on Solaris/Linux
+            // by successfully acquiring the appropriate file lock (4947349)
+            N1.removeNode();
+
+            if (((exportStream.toString()).lastIndexOf("ExportNodeTestName2")== -1) ||
+               ((exportStream.toString()).lastIndexOf("ExportNodeTestName1")!= -1)) {
+            }
+   }
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/java/util/prefs/ExportSubtree.java	Thu Aug 13 15:01:18 2009 -0700
@@ -0,0 +1,95 @@
+/*
+ * Copyright 2009 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+
+/* @test
+   @bug 6203576 4700020
+   @summary checks if the output of exportSubtree() is identical to
+            the output from previous release.
+ */
+
+import java.io.*;
+import java.util.prefs.*;
+
+public class ExportSubtree {
+   public static void main(String[] args) throws Exception {
+      try
+      {
+          //File f = new File(System.getProperty("test.src", "."), "TestPrefs.xml");
+          ByteArrayInputStream bais = new ByteArrayInputStream(importPrefs.getBytes("utf-8"));
+          Preferences.importPreferences(bais);
+          ByteArrayOutputStream baos = new ByteArrayOutputStream();
+          Preferences.userRoot().node("testExportSubtree").exportSubtree(baos);
+          Preferences.userRoot().node("testExportSubtree").removeNode();
+          if (!expectedResult.equals(baos.toString())) {
+              //System.out.print(baos.toString());
+              //System.out.print(expectedResult);
+              throw new IOException("exportSubtree does not output expected result");
+          }
+      }
+      catch( Exception e ) {
+         e.printStackTrace();
+      }
+   }
+
+   static String ls = System.getProperty("line.separator");
+   static String importPrefs =
+       "<?xml version=\"1.0\" encoding=\"UTF-8\"?>"
+        + "<!DOCTYPE preferences SYSTEM \"http://java.sun.com/dtd/preferences.dtd\">"
+        + "<preferences EXTERNAL_XML_VERSION=\"1.0\">"
+        + "  <root type=\"user\">"
+        + "    <map>"
+        + "      <entry key=\"key1\" value=\"value1\"/>"
+        + "    </map>"
+        + "    <node name=\"testExportSubtree\">"
+        + "      <map>"
+        + "        <entry key=\"key2\" value=\"value2\"/>"
+        + "      </map>"
+        + "      <node name=\"test\">"
+        + "        <map>"
+        + "          <entry key=\"key3\" value=\"value3\"/>"
+        + "        </map>"
+        + "      </node>"
+        + "    </node>"
+        + "  </root>"
+        + "</preferences>";
+
+   static String expectedResult =
+       "<?xml version=\"1.0\" encoding=\"UTF-8\"?>"
+        + ls    +  "<!DOCTYPE preferences SYSTEM \"http://java.sun.com/dtd/preferences.dtd\">"
+        + ls    +  "<preferences EXTERNAL_XML_VERSION=\"1.0\">"
+        + ls    +  "  <root type=\"user\">"
+        + ls    +  "    <map/>"
+        + ls    +  "    <node name=\"testExportSubtree\">"
+        + ls    +  "      <map>"
+        + ls    +  "        <entry key=\"key2\" value=\"value2\"/>"
+        + ls    +  "      </map>"
+        + ls    +  "      <node name=\"test\">"
+        + ls    +  "        <map>"
+        + ls    +  "          <entry key=\"key3\" value=\"value3\"/>"
+        + ls    +  "        </map>"
+        + ls    +  "      </node>"
+        + ls    +  "    </node>"
+        + ls    +  "  </root>"
+        + ls    +  "</preferences>"     + ls;
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/java/util/prefs/PrefsSpi.java	Thu Aug 13 15:01:18 2009 -0700
@@ -0,0 +1,44 @@
+/*
+ * Copyright 2009 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+
+import java.util.prefs.Preferences;
+
+/*
+ * main class used by regtest PrefsSpi.sh
+ */
+public class PrefsSpi {
+
+    public static void main (String[] args) throws Exception {
+        if (args.length != 1)
+            throw new Exception("Usage: java PrefsSpi REGEXP");
+
+        String className = Preferences.userRoot().getClass().getName();
+        System.out.printf("className=%s%n", className);
+
+        if (! className.matches(args[0]))
+            throw new Exception("Preferences class name \"" + className
+                                + "\" does not match regular expression \""
+                                + args[0] + "\".");
+    }
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/java/util/prefs/PrefsSpi.sh	Thu Aug 13 15:01:18 2009 -0700
@@ -0,0 +1,100 @@
+#!/bin/sh
+
+#
+# Copyright 2009 Sun Microsystems, Inc.  All Rights Reserved.
+# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+#
+# This code is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License version 2 only, as
+# published by the Free Software Foundation.
+#
+# This code 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
+# version 2 for more details (a copy is included in the LICENSE file that
+# accompanied this code).
+#
+# You should have received a copy of the GNU General Public License version
+# 2 along with this work; if not, write to the Free Software Foundation,
+# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+#
+# Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+# CA 95054 USA or visit www.sun.com if you need additional information or
+# have any questions.
+#
+
+# @test
+# @bug 4991526 6514993
+# @summary Unit test for Preferences jar providers
+#
+# @build PrefsSpi
+# @run shell PrefsSpi.sh
+# @author Martin Buchholz
+
+# Command-line usage: sh PrefsSpi.sh /path/to/build
+
+if [ -z "$TESTJAVA" ]; then
+    if [ $# -lt 1 ]; then exit 1; fi
+    TESTJAVA="$1"; shift
+    TESTSRC="`pwd`"
+    TESTCLASSES="`pwd`"
+fi
+
+ java="$TESTJAVA/bin/java"
+javac="$TESTJAVA/bin/javac"
+  jar="$TESTJAVA/bin/jar"
+
+Die() { printf "%s\n" "$*"; exit 1; }
+
+Sys() {
+    printf "%s\n" "$*"; "$@"; rc="$?";
+    test "$rc" -eq 0 || Die "Command \"$*\" failed with exitValue $rc";
+}
+
+cat > StubPreferences.java <<'EOF'
+import java.util.prefs.*;
+
+public class StubPreferences extends AbstractPreferences {
+    public StubPreferences() { super(null, ""); }
+    public String              getSpi(String x)           { return null; }
+    public void                putSpi(String x, String y) { }
+    public void                removeSpi(String x)        { }
+    public AbstractPreferences childSpi(String x)         { return null; }
+    public void                removeNodeSpi()            { }
+    public String[]            keysSpi()                  { return null; }
+    public String[]            childrenNamesSpi()         { return null; }
+    public void                syncSpi()                  { }
+    public void                flushSpi()                 { }
+}
+EOF
+
+cat > StubPreferencesFactory.java <<'EOF'
+import java.util.prefs.*;
+
+public class StubPreferencesFactory implements PreferencesFactory {
+    public Preferences userRoot()   { return new StubPreferences(); }
+    public Preferences systemRoot() { return new StubPreferences(); }
+}
+EOF
+
+Sys rm -rf jarDir extDir
+Sys mkdir -p jarDir/META-INF/services extDir
+echo "StubPreferencesFactory" \
+  > "jarDir/META-INF/services/java.util.prefs.PreferencesFactory"
+Sys "$javac" -d jarDir StubPreferencesFactory.java StubPreferences.java
+
+(cd jarDir && "$jar" "cf" "../extDir/PrefsSpi.jar" ".")
+
+case "`uname`" in Windows*|CYGWIN* ) CPS=';';; *) CPS=':';; esac
+
+Sys "$java" "-cp" "$TESTCLASSES${CPS}extDir/PrefsSpi.jar" \
+    -Djava.util.prefs.PreferencesFactory=StubPreferencesFactory \
+    PrefsSpi "StubPreferences"
+Sys "$java" "-cp" "$TESTCLASSES" \
+    PrefsSpi "java.util.prefs.*"
+Sys "$java" "-cp" "$TESTCLASSES${CPS}extDir/PrefsSpi.jar" \
+    PrefsSpi "StubPreferences"
+Sys "$java" "-cp" "$TESTCLASSES" "-Djava.ext.dirs=extDir" \
+    PrefsSpi "StubPreferences"
+
+rm -rf jarDir extDir

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/java/util/prefs/RemoveReadOnlyNode.java	Thu Aug 13 15:01:18 2009 -0700
@@ -0,0 +1,63 @@
+/*
+ * Copyright 2009 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+
+/* @test
+   @bug 6178148
+   @summary check if wrong exception gets thrown if one of the child
+            nodes is readonly on underlying filesystem when node is
+            being removed.
+ */
+
+import java.io.*;
+import java.util.prefs.*;
+
+public class RemoveReadOnlyNode {
+    public static void main(String[] args) throws Exception {
+        String osName = System.getProperty("os.name");
+        if (osName.startsWith("Windows"))
+            return;
+        Preferences root = Preferences.userRoot();
+        Preferences node1 = root.node("node1");
+        Preferences node1A = node1.node("node1A");
+        Preferences node1B = node1.node("node1B");
+        node1B.put("mykey", "myvalue");
+        node1.flush();
+        String node1BDirName = System.getProperty("user.home")
+            + "/.java/.userPrefs"
+            + "/node1/node1B";
+        File node1BDir = new File(node1BDirName);
+        node1BDir.setReadOnly();
+        try {
+            node1.removeNode();
+        }
+        catch (BackingStoreException ex) {
+            //expected exception
+        } finally {
+            Runtime.getRuntime().exec("chmod 755 " + node1BDirName).waitFor();
+            try {
+                node1.removeNode();
+            } catch (Exception e) {}
+        }
+    }
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/java/util/prefs/RemoveUnregedListener.java	Thu Aug 13 15:01:18 2009 -0700
@@ -0,0 +1,63 @@
+/*
+ * Copyright 2009 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+
+/* @test
+ * @bug 4705094
+ * @summary Checks if correct exception gets thrown when removing an
+ *          unregistered NodeChangeListener .
+ */
+
+import java.util.prefs.*;
+import java.util.*;
+
+public class RemoveUnregedListener {
+    public static void main(String[] args) throws Exception {
+        Preferences userRoot = null;
+        Preferences N1 = null;
+        NodeChangeListenerTestAdd ncl = new NodeChangeListenerTestAdd();
+        NodeChangeListenerTestAdd ncl2 = new NodeChangeListenerTestAdd();
+        NodeChangeListenerTestAdd ncl3 = new NodeChangeListenerTestAdd();
+        try {
+            userRoot = Preferences.userRoot();
+            N1 = userRoot.node("N1");
+            userRoot.flush();
+
+            //add ncl nc2
+            N1.addNodeChangeListener(ncl);
+            N1.addNodeChangeListener(ncl2);
+            N1.removeNodeChangeListener(ncl3);
+            throw new RuntimeException();
+        } catch (IllegalArgumentException iae) {
+            System.out.println("Test Passed!");
+        } catch (Exception e) {
+            System.out.println("Test Failed");
+            throw e;
+        }
+    }
+
+}
+class NodeChangeListenerTestAdd implements NodeChangeListener {
+    public void childAdded(NodeChangeEvent evt) {}
+    public void childRemoved(NodeChangeEvent evt) {}
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/java/util/prefs/SerializeExceptions.java	Thu Aug 13 15:01:18 2009 -0700
@@ -0,0 +1,48 @@
+/*
+ * Copyright 2009 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+
+/*
+ * @test
+ * @bug     4811356
+ * @summary Prefs exceptions were unintentionally not serializable
+ * @author  Josh Bloch
+ */
+
+import java.util.prefs.*;
+import java.io.*;
+
+public class SerializeExceptions {
+    public static void main(String args[]) throws Exception {
+        test(new BackingStoreException("Hi"));
+        test(new InvalidPreferencesFormatException("Mom!"));
+    }
+
+    static void test(Object o) throws IOException {
+        ByteArrayOutputStream bos = new ByteArrayOutputStream();
+        ObjectOutputStream out = new ObjectOutputStream(bos);
+        out.writeObject(o);
+        out.flush();
+        out.close();
+    }
+}