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Issue gh-41

spring-session/src/main/java/org/springframework/session/data/redis/SessionMessageListener.java

@@ -60,10 +60,15 @@ public class SessionMessageListener implements MessageListener {
         if(!body.startsWith("spring:session:sessions:")) {
             return;
         }
+
         int beginIndex = body.lastIndexOf(":") + 1;
         int endIndex = body.length();
         String sessionId = body.substring(beginIndex, endIndex);
 
+        if(logger.isDebugEnabled()) {
+            logger.debug("Publishing SessionDestroyedEvent for session " + sessionId);
+        }
+
         publishEvent(new SessionDestroyedEvent(this, sessionId));
     }
 

spring-session/src/main/java/org/springframework/session/data/redis/config/annotation/web/http/RedisHttpSessionConfiguration.java

@@ -161,8 +161,6 @@ public class RedisHttpSessionConfiguration implements ImportAware, BeanClassLoad
             this.connectionFactory = connectionFactory;
         }
 
-
-        @Override
         public void afterPropertiesSet() throws Exception {
             RedisConnection connection = connectionFactory.getConnection();
             String notifyOptions = getNotifyOptions(connection);

spring-session/src/main/java/org/springframework/session/web/http/CookieHttpSessionStrategy.java

@@ -19,6 +19,7 @@ import java.io.UnsupportedEncodingException;
 import java.net.URLEncoder;
 import java.util.LinkedHashMap;
 import java.util.Map;
+import java.util.Set;
 import java.util.StringTokenizer;
 import java.util.regex.Pattern;
 
@@ -180,6 +181,29 @@ public final class CookieHttpSessionStrategy implements MultiHttpSessionStrategy
         return u;
     }
 
+    public String getNewSessionAlias(HttpServletRequest request) {
+        Set<String> sessionAliases = getSessionIds(request).keySet();
+        if(sessionAliases.isEmpty()) {
+            return DEFAULT_ALIAS;
+        }
+        long lastAlias = Long.decode(DEFAULT_ALIAS);
+        for(String alias : sessionAliases) {
+            long selectedAlias = safeParse(alias);
+            if(selectedAlias > lastAlias) {
+                lastAlias = selectedAlias;
+            }
+        }
+        return Long.toHexString(lastAlias + 1);
+    }
+
+    private long safeParse(String hex) {
+        try {
+            return Long.decode("0x" + hex);
+        } catch(NumberFormatException notNumber) {
+            return 0;
+        }
+    }
+
     public void onNewSession(Session session, HttpServletRequest request, HttpServletResponse response) {
         Map<String,String> sessionIds = getSessionIds(request);
         String sessionAlias = getCurrentSessionAlias(request);
@@ -293,6 +317,9 @@ public final class CookieHttpSessionStrategy implements MultiHttpSessionStrategy
         }
         while(tokens.hasMoreTokens()) {
             String alias = tokens.nextToken();
+            if(!tokens.hasMoreTokens()) {
+                break;
+            }
             String id = tokens.nextToken();
             result.put(alias, id);
         }

spring-session/src/main/java/org/springframework/session/web/http/HttpSessionManager.java

@@ -59,4 +59,18 @@ public interface HttpSessionManager {
      * @return the encoded URL
      */
     String encodeURL(String url, String sessionAlias);
+
+    /**
+     * Gets a new and unique Session alias. Typically this will be called to pass into
+     * {@code HttpSessionManager#encodeURL(java.lang.String)}. For example:
+     *
+     * <code>
+     * String newAlias = httpSessionManager.getNewSessionAlias(request);
+     * String addAccountUrl = httpSessionManager.encodeURL("./", newAlias);
+     * </code>
+     *
+     * @param request
+     * @return
+     */
+    String getNewSessionAlias(HttpServletRequest request);
 }