diff --git a/src/main/java/org/rometools/certiorem/example/HubServlet.java b/src/main/java/org/rometools/certiorem/example/HubServlet.java
index 6ef9d9f..7a6f68f 100644
--- a/src/main/java/org/rometools/certiorem/example/HubServlet.java
+++ b/src/main/java/org/rometools/certiorem/example/HubServlet.java
@@ -12,14 +12,17 @@ import com.google.inject.Inject;
 import com.google.inject.Singleton;
 
 /**
- * 
+ *
  * @author robert.cooper
  */
 @Singleton
 public class HubServlet extends AbstractHubServlet {
 
+    private static final long serialVersionUID = 1L;
+
     @Inject
     public HubServlet(final Hub hub) {
         super(hub);
     }
+
 }
diff --git a/src/main/java/org/rometools/certiorem/example/NotifyTest.java b/src/main/java/org/rometools/certiorem/example/NotifyTest.java
index 0ccd54e..f829e31 100644
--- a/src/main/java/org/rometools/certiorem/example/NotifyTest.java
+++ b/src/main/java/org/rometools/certiorem/example/NotifyTest.java
@@ -19,12 +19,14 @@ import org.rometools.certiorem.pub.Publisher;
 import com.google.inject.Singleton;
 
 /**
- * 
+ *
  * @author robert.cooper
  */
 @Singleton
 public class NotifyTest extends HttpServlet {
 
+    private static final long serialVersionUID = 1L;
+
     @Override
     public void doGet(final HttpServletRequest request, final HttpServletResponse response) throws ServletException {
         final Publisher pub = new Publisher();
@@ -35,4 +37,5 @@ public class NotifyTest extends HttpServlet {
             throw new ServletException(ex);
         }
     }
+
 }
diff --git a/src/main/java/org/rometools/certiorem/example/SubServlet.java b/src/main/java/org/rometools/certiorem/example/SubServlet.java
index 6114283..97d40f4 100644
--- a/src/main/java/org/rometools/certiorem/example/SubServlet.java
+++ b/src/main/java/org/rometools/certiorem/example/SubServlet.java
@@ -12,12 +12,14 @@ import com.google.inject.Inject;
 import com.google.inject.Singleton;
 
 /**
- * 
+ *
  * @author robert.cooper
  */
 @Singleton
 public class SubServlet extends AbstractSubServlet {
 
+    private static final long serialVersionUID = 1L;
+
     @Inject
     public SubServlet(final Subscriptions subscriptions) {
         super(subscriptions);
diff --git a/src/main/java/org/rometools/certiorem/example/SubTest.java b/src/main/java/org/rometools/certiorem/example/SubTest.java
index ba4c2c3..6a43249 100644
--- a/src/main/java/org/rometools/certiorem/example/SubTest.java
+++ b/src/main/java/org/rometools/certiorem/example/SubTest.java
@@ -18,12 +18,14 @@ import com.google.inject.Inject;
 import com.google.inject.Singleton;
 
 /**
- * 
+ *
  * @author robert.cooper
  */
 @Singleton
 public class SubTest extends HttpServlet {
 
+    private static final long serialVersionUID = 1L;
+
     private final Subscriptions subs;
 
     @Inject