Code quality fix - Utility classes should not have public constructors.

src/main/java/com/cloudhopper/smpp/SmppConstants.java

@@ -31,6 +31,8 @@
  */
 public class SmppConstants {
 
+    private SmppConstants() {}
+
     //
     // SMPP Data Types
     //

src/main/java/com/cloudhopper/smpp/channel/ChannelUtil.java

@@ -30,6 +30,8 @@
  */
 public class ChannelUtil {
 
+    private ChannelUtil() {}
+
     /**
      * Create a name for the channel based on the remote host's IP and port.
      */

src/main/java/com/cloudhopper/smpp/channel/SmppChannelConstants.java

@@ -27,6 +27,8 @@
  */
 public class SmppChannelConstants {
 
+    private SmppChannelConstants() {}
+
     public static final String PIPELINE_SERVER_CONNECTOR_NAME = "smppServerConnector";
 
     // default channel handler used only during connects

src/main/java/com/cloudhopper/smpp/util/ChannelBufferUtil.java

@@ -37,6 +37,9 @@
  * @author joelauer (twitter: @jjlauer or <a href="http://twitter.com/jjlauer" target=window>http://twitter.com/jjlauer</a>)
  */
 public class ChannelBufferUtil {
+
+    private ChannelBufferUtil() {}
+
     private static final Logger logger = LoggerFactory.getLogger(ChannelBufferUtil.class);
 
     /**

src/main/java/com/cloudhopper/smpp/util/DaemonExecutors.java

@@ -30,6 +30,8 @@
  */
 public class DaemonExecutors {
 
+    private DaemonExecutors() {}
+
     /**
      * Utility method for creating a cached pool of "daemon" threads.  A daemon
      * thread does not limit the JVM from exiting if they aren't shutdown.

src/main/java/com/cloudhopper/smpp/util/PduUtil.java

@@ -29,6 +29,8 @@
  */
 public class PduUtil {
 
+    private PduUtil() {}
+
     /**
      * Calculates size of a "C-String" by returning the length of the String
      * plus 1 (for the NULL byte).  If the parameter is null, will return 1.

src/main/java/com/cloudhopper/smpp/util/SmppSessionUtil.java

@@ -34,6 +34,9 @@
  * @author joelauer (twitter: @jjlauer or <a href="http://twitter.com/jjlauer" target=window>http://twitter.com/jjlauer</a>)
  */
 public class SmppSessionUtil {
+
+    private SmppSessionUtil() {}
+
     private static final Logger logger = LoggerFactory.getLogger(SmppSessionUtil.class);
 
     static public void close(SmppSession session) {

src/main/java/com/cloudhopper/smpp/util/SmppUtil.java

@@ -31,6 +31,8 @@
  */
 public class SmppUtil {
 
+    private SmppUtil() {}
+
     /**
      * Does the "esm_class" value have a message type set at all?  This basically
      * checks if the "esm_class" could either be SMSC delivery receipt, ESME delivery receipt,

src/main/java/com/cloudhopper/smpp/util/TlvUtil.java

@@ -30,6 +30,8 @@
  * @author joelauer (twitter: @jjlauer or <a href="http://twitter.com/jjlauer" target=window>http://twitter.com/jjlauer</a>)
  */
 public class TlvUtil {
+
+    private TlvUtil() {}
 
     /**
      * Writes a variable length C-String (null terminated) TLV.  If the String