Author: violetagg
Date: Wed Jul  3 19:35:38 2013
New Revision: 1499534

URL: http://svn.apache.org/r1499534
Log:
Avoid NPE when a background thread tries to expire the HTTP sessions.

Modified:
    tomcat/trunk/java/org/apache/tomcat/websocket/server/WsServerContainer.java

Modified: 
tomcat/trunk/java/org/apache/tomcat/websocket/server/WsServerContainer.java
URL: 
http://svn.apache.org/viewvc/tomcat/trunk/java/org/apache/tomcat/websocket/server/WsServerContainer.java?rev=1499534&r1=1499533&r2=1499534&view=diff
==============================================================================
--- tomcat/trunk/java/org/apache/tomcat/websocket/server/WsServerContainer.java 
(original)
+++ tomcat/trunk/java/org/apache/tomcat/websocket/server/WsServerContainer.java 
Wed Jul  3 19:35:38 2013
@@ -367,12 +367,14 @@ public class WsServerContainer extends W
     public void closeAuthenticatedSession(String httpSessionId) {
         Set<WsSession> wsSessions = 
authenticatedSessions.remove(httpSessionId);
 
-        for (WsSession wsSession : wsSessions) {
-            try {
-                wsSession.close(AUTHENTICATED_HTTP_SESSION_CLOSED);
-            } catch (IOException e) {
-                // Any IOExceptions during close will have been caught and the
-                // onError method called.
+        if (wsSessions != null && !wsSessions.isEmpty()) {
+            for (WsSession wsSession : wsSessions) {
+                try {
+                    wsSession.close(AUTHENTICATED_HTTP_SESSION_CLOSED);
+                } catch (IOException e) {
+                    // Any IOExceptions during close will have been caught and 
the
+                    // onError method called.
+                }
             }
         }
     }



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