--- a/src/java.xml/share/classes/com/sun/org/apache/xalan/internal/xsltc/trax/TemplatesImpl.java	Sat Apr 18 00:17:19 2015 -0700
+++ b/src/java.xml/share/classes/com/sun/org/apache/xalan/internal/xsltc/trax/TemplatesImpl.java	Tue May 12 10:02:21 2015 -0700
@@ -31,6 +31,7 @@
 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ErrorMsg;
 import com.sun.org.apache.xalan.internal.xsltc.runtime.AbstractTranslet;
 import java.io.IOException;
+import java.io.NotSerializableException;
 import java.io.ObjectInputStream;
 import java.io.ObjectOutputStream;
 import java.io.ObjectStreamField;
@@ -38,7 +39,6 @@
 import java.security.AccessController;
 import java.security.PrivilegedAction;
 import java.util.HashMap;
-import java.util.Hashtable;
 import java.util.Map;
 import java.util.Properties;
 import javax.xml.XMLConstants;
@@ -91,7 +91,7 @@
     /**
      * Contains the list of auxiliary class definitions.
      */
-    private Map<String, Class<?>> _auxClasses = null;
+    private transient Map<String, Class<?>> _auxClasses = null;
 
     /**
      * Output properties of this translet.
@@ -139,7 +139,6 @@
      * @serialField _bytecodes byte[][] Class definition
      * @serialField _class Class[] The translet class definition(s).
      * @serialField _transletIndex int The index of the main translet class
-     * @serialField _auxClasses Hashtable The list of auxiliary class definitions.
      * @serialField _outputProperties Properties Output properties of this translet.
      * @serialField _indentNumber int Number of spaces to add for output indentation.
      */
@@ -149,7 +148,6 @@
             new ObjectStreamField("_bytecodes", byte[][].class),
             new ObjectStreamField("_class", Class[].class),
             new ObjectStreamField("_transletIndex", int.class),
-            new ObjectStreamField("_auxClasses", Hashtable.class),
             new ObjectStreamField("_outputProperties", Properties.class),
             new ObjectStreamField("_indentNumber", int.class),
         };
@@ -238,6 +236,7 @@
      *  if yes then we need to deserialize the URIResolver
      *  Fix for bugzilla bug 22438
      */
+    @SuppressWarnings("unchecked")
     private void  readObject(ObjectInputStream is)
       throws IOException, ClassNotFoundException
     {
@@ -257,13 +256,9 @@
         _class = (Class[])gf.get("_class", null);
         _transletIndex = gf.get("_transletIndex", -1);
 
-        Hashtable<String, Class<?>> aux = (Hashtable<String, Class<?>>)gf.get("_auxClasses", null);
         _outputProperties = (Properties)gf.get("_outputProperties", null);
         _indentNumber = gf.get("_indentNumber", 0);
 
-        //convert Hashtable back to HashMap
-        if (aux != null) _auxClasses = new HashMap<>(aux);
-
         if (is.readBoolean()) {
             _uriResolver = (URIResolver) is.readObject();
         }
@@ -279,8 +274,11 @@
      */
     private void writeObject(ObjectOutputStream os)
         throws IOException, ClassNotFoundException {
-        // Convert Maps to Hashtables
-        Hashtable<String, Class<?>> aux = (_auxClasses == null)? null : new Hashtable<>(_auxClasses);
+        if (_auxClasses != null) {
+            //throw with the same message as when Hashtable was used for compatibility.
+            throw new NotSerializableException(
+                    "com.sun.org.apache.xalan.internal.xsltc.runtime.Hashtable");
+        }
 
         // Write serialized fields
         ObjectOutputStream.PutField pf = os.putFields();
@@ -288,7 +286,6 @@
         pf.put("_bytecodes", _bytecodes);
         pf.put("_class", _class);
         pf.put("_transletIndex", _transletIndex);
-        pf.put("_auxClasses", aux);
         pf.put("_outputProperties", _outputProperties);
         pf.put("_indentNumber", _indentNumber);
         os.writeFields();

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/javax/xml/jaxp/unittest/transform/TemplatesTest.java	Tue May 12 10:02:21 2015 -0700
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2015, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package transform;
+
+import java.io.ByteArrayOutputStream;
+import java.io.NotSerializableException;
+import java.io.ObjectOutputStream;
+import java.io.StringReader;
+import javax.xml.transform.*;
+import javax.xml.transform.stream.StreamSource;
+import org.testng.annotations.DataProvider;
+import org.testng.annotations.Test;
+
+/*
+ * @summary This class contains tests for Templates.
+ */
+public class TemplatesTest {
+
+    /**
+     * @bug 8079323 Test Templates serialization
+     * <p>
+     * Serialization compatibility test: verify that serializing the Templates
+     * that contain auxiliary classes will result in a NotSerializableException
+     * due to the use of Xalan's non-serializable Hashtable.
+     *
+     * @param templates an instance of Templates
+     * @throws Exception as expected.
+     */
+    @Test(dataProvider = "templates", expectedExceptions = NotSerializableException.class)
+    public void testSerialization(Templates templates) throws Exception {
+        Transformer xformer = templates.newTransformer();
+        try (ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
+                ObjectOutputStream out = new ObjectOutputStream(byteOut);) {
+            out.writeObject(templates);
+            out.flush();
+        }
+    }
+
+    /*
+     * DataProvider: Templates
+     */
+    @DataProvider(name = "templates")
+    Object[][] getTemplates() throws Exception {
+        return new Object[][]{{TransformerFactory.newInstance().
+                newTemplates(new StreamSource(new StringReader(XSL)))}};
+    }
+
+    static final String XSL = "<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>"
+            + "<xsl:stylesheet version=\"1.0\""
+            + "      xmlns:xsl=\"http://www.w3.org/1999/XSL/Transform\">"
+            + "<xsl:variable name=\"validAffectsRelClasses\">"
+            + "</xsl:variable>"
+            + "<xsl:key name=\"UniqueAffectsRelObjects\""
+            + "      match=\"/ObjectSetRoot/Object["
+            + "      contains($validAffectsRelClasses, @Class)]\""
+            + "      use=\"not(@OBID=preceding-sibling::Object["
+            + "      contains($validAffectsRelClasses, @Class)]/@OBID)\"/>"
+            + "</xsl:stylesheet>";
+}