Fix major update integrating with external wisemapping frond end

wise-webapp/src/main/java/com/wisemapping/service/LockInfo.java

@@ -28,7 +28,7 @@ public class LockInfo {
     final private User user;
     private Calendar timeout;
     private long session;
-    private static int EXPIRATION_MIN = 30;
+    private static final int EXPIRATION_MIN = 30;
     private long timestamp = -1;
     private long previousTimestamp;