3 files changed, 3 insertions, 13 deletions
diff --git a/server/src/com/vaadin/server/AbstractClientConnector.java b/server/src/com/vaadin/server/AbstractClientConnector.java
index 2fb468bd1c..4c22a96782 100644
--- a/server/src/com/vaadin/server/AbstractClientConnector.java
+++ b/server/src/com/vaadin/server/AbstractClientConnector.java
@@ -146,8 +146,6 @@ public abstract class AbstractClientConnector implements ClientConnector {
     }
 
     protected SharedState getState() {
-        assert getSession() == null
-                || getSession().getLock().isHeldByCurrentThread() : VaadinSession.SESSION_LOCK_MESSAGE;
         if (null == sharedState) {
             sharedState = createState();
         }
diff --git a/server/src/com/vaadin/server/VaadinSession.java b/server/src/com/vaadin/server/VaadinSession.java
index 03e6420008..a91c011ddf 100644
--- a/server/src/com/vaadin/server/VaadinSession.java
+++ b/server/src/com/vaadin/server/VaadinSession.java
@@ -28,6 +28,7 @@ import java.util.LinkedList;
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;
+import java.util.concurrent.locks.Lock;
 import java.util.concurrent.locks.ReentrantLock;
 import java.util.logging.Logger;
 
@@ -70,8 +71,6 @@ public class VaadinSession implements HttpSessionBindingListener, Serializable {
      */
     public static final String UI_PARAMETER = "UI";
 
-    public static final String SESSION_LOCK_MESSAGE = "You are accessing UI state without proper synchronization!";
-
     private static final Method BOOTSTRAP_FRAGMENT_METHOD = ReflectTools
             .findMethod(BootstrapListener.class, "modifyBootstrapFragment",
                     BootstrapFragmentResponse.class);
@@ -79,7 +78,7 @@ public class VaadinSession implements HttpSessionBindingListener, Serializable {
             .findMethod(BootstrapListener.class, "modifyBootstrapPage",
                     BootstrapPageResponse.class);
 
-    private final ReentrantLock lock = new ReentrantLock();
+    private final Lock lock = new ReentrantLock();
 
     /**
      * An event sent to {@link #start(SessionStartEvent)} when a new Application
@@ -207,10 +206,6 @@ public class VaadinSession implements HttpSessionBindingListener, Serializable {
 
     private final Map<String, Object> attributes = new HashMap<String, Object>();
 
-    public VaadinSession() {
-        // TODO Auto-generated constructor stub
-    }
-
     /**
      * @see javax.servlet.http.HttpSessionBindingListener#valueBound(HttpSessionBindingEvent)
      */
@@ -1309,7 +1304,7 @@ public class VaadinSession implements HttpSessionBindingListener, Serializable {
      * 
      * @return the lock that should be used for synchronization
      */
-    public ReentrantLock getLock() {
+    public Lock getLock() {
         return lock;
     }
 
diff --git a/server/src/com/vaadin/ui/ConnectorTracker.java b/server/src/com/vaadin/ui/ConnectorTracker.java
index dbada63a47..d454df98ee 100644
--- a/server/src/com/vaadin/ui/ConnectorTracker.java
+++ b/server/src/com/vaadin/ui/ConnectorTracker.java
@@ -29,7 +29,6 @@ import com.vaadin.server.AbstractClientConnector;
 import com.vaadin.server.AbstractCommunicationManager;
 import com.vaadin.server.ClientConnector;
 import com.vaadin.server.GlobalResourceHandler;
-import com.vaadin.server.VaadinSession;
 
 /**
  * A class which takes care of book keeping of {@link ClientConnector}s for a
@@ -287,8 +286,6 @@ public class ConnectorTracker implements Serializable {
      *            The connector that should be marked clean.
      */
     public void markDirty(ClientConnector connector) {
-        assert uI.getSession() == null
-                || uI.getSession().getLock().isHeldByCurrentThread() : VaadinSession.SESSION_LOCK_MESSAGE;
         if (isWritingResponse()) {
             throw new IllegalStateException(
                     "A connector should not be marked as dirty while a response is being written.");