--- a/jdk/src/share/classes/com/sun/jmx/snmp/SnmpString.java	Fri Oct 18 13:51:12 2013 +0100
+++ b/jdk/src/share/classes/com/sun/jmx/snmp/SnmpString.java	Fri Oct 18 16:15:38 2013 +0200
@@ -130,7 +130,7 @@
      * @return The value.
      */
     public byte[] byteValue() {
-        return value ;
+        return value.clone() ;
     }
 
     /**

--- a/jdk/src/share/classes/com/sun/jmx/snmp/agent/SnmpMib.java	Fri Oct 18 13:51:12 2013 +0100
+++ b/jdk/src/share/classes/com/sun/jmx/snmp/agent/SnmpMib.java	Fri Oct 18 16:15:38 2013 +0200
@@ -476,8 +476,7 @@
                 rootOid[i++]= val.longValue();
             }
         }
-        return rootOid;
-
+        return rootOid.clone();
     }
 
     // --------------------------------------------------------------------

--- a/jdk/src/share/classes/com/sun/jmx/snmp/daemon/CommunicatorServer.java	Fri Oct 18 13:51:12 2013 +0100
+++ b/jdk/src/share/classes/com/sun/jmx/snmp/daemon/CommunicatorServer.java	Fri Oct 18 16:15:38 2013 +0200
@@ -1248,7 +1248,7 @@
                      "of this CommunicatorServer instance has changed.");
         }
 
-        return notifInfos;
+        return notifInfos.clone();
     }
 
     /**

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/com/sun/jmx/snmp/NoInfoLeakTest.java	Fri Oct 18 16:15:38 2013 +0200
@@ -0,0 +1,126 @@
+/*
+ * Copyright (c) 2013, 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.
+ */
+
+/* @test
+ * @bug 8026028
+ * @summary Tests no leak of internal info
+ * @author Shanliang JIANG
+ * @run clean NoInfoLeakTest
+ * @run build NoInfoLeakTest
+ * @run main NoInfoLeakTest
+ */
+
+import com.sun.jmx.snmp.SnmpString;
+import com.sun.jmx.snmp.agent.SnmpMib;
+import com.sun.jmx.snmp.agent.SnmpMibTable;
+import com.sun.jmx.snmp.daemon.CommunicatorServer;
+import com.sun.jmx.snmp.daemon.SnmpAdaptorServer;
+import javax.management.MBeanNotificationInfo;
+import javax.management.MBeanServer;
+import javax.management.ObjectName;
+
+public class NoInfoLeakTest {
+    public static void main(String[] args) throws Exception {
+        boolean ok = true;
+        ok &= snmpStringTest();
+        ok &= snmpMibTest();
+        ok &= communicatorServerTest();
+
+        if (!ok) {
+            throw new RuntimeException("Some tests are failed!");
+        }
+    }
+
+    private static boolean snmpStringTest() {
+        System.out.println("\n---NoInfoLeakTest-snmpStringTest: testing the method byteValue()...");
+        boolean passed = true;
+
+        byte[] mine = new byte[]{1,1,1,};
+        SnmpString ss = new SnmpString(mine);
+        byte[] got = ss.byteValue();
+        got[0]=0;
+
+        if (ss.byteValue()[0] == 0) {
+            System.err.println("Failed: SnmpString.byteValue() returns an internal mutable object value");
+            passed = false;
+        } else {
+            System.out.println("---NoInfoLeakTest-snmpStringTest done.");
+        }
+        return passed;
+    }
+
+    private static boolean snmpMibTest() {
+        boolean passed = true;
+        System.out.println("\n---NoInfoLeakTest-snmpMibTest: testing the method "
+                + "SnmpMib.getRootOid()...");
+        SnmpMib mib = new MySnmpMib();
+
+        if (mib.getRootOid() == mib.getRootOid()) {
+            System.err.println("Failed: SnmpMib.getRootOid() returns an internal"
+                    + " mutable object value "+mib.getRootOid());
+        } else {
+            System.out.println("---NoInfoLeakTest-snmpMibTest done.");
+        }
+        return passed;
+    }
+
+    private static boolean communicatorServerTest() {
+        boolean passed = true;
+        System.out.println("\n---NoInfoLeakTest-communicatorServerTest: testing the method CommunicatorServer.getNotificationInfo()...");
+        CommunicatorServer server = new SnmpAdaptorServer();
+        MBeanNotificationInfo[] notifs = server.getNotificationInfo();
+
+        assert notifs.length > 0 && notifs[0] != null; // the current implementation ensures this
+        notifs[0] = null;
+        if (server.getNotificationInfo()[0] == null) {
+            System.err.println("Failed: CommunicatorServer.getNotificationInfo()"
+                    + " returns an internal mutable object value");
+            passed = false;
+        } else {
+            System.out.println("---NoInfoLeakTest-communicatorServerTest done.");
+        }
+        return passed;
+    }
+
+    private static class MySnmpMib extends SnmpMib {
+        @Override
+        public void registerTableMeta(String name, SnmpMibTable table) {
+            throw new UnsupportedOperationException("Not supported yet.");
+        }
+
+        @Override
+        public SnmpMibTable getRegisteredTableMeta(String name) {
+            throw new UnsupportedOperationException("Not supported yet.");
+        }
+
+        @Override
+        public void init() throws IllegalAccessException {
+            throw new UnsupportedOperationException("Not supported yet.");
+        }
+
+        @Override
+        public ObjectName preRegister(MBeanServer server, ObjectName name) throws Exception {
+            throw new UnsupportedOperationException("Not supported yet.");
+        }
+    }
+}