[java] Small code improvement in ProxyWebsocketsIntoGrid

Author: diemol

java/src/org/openqa/selenium/grid/router/ProxyWebsocketsIntoGrid.java

@@ -28,6 +28,7 @@
 import java.util.logging.Logger;
 import org.openqa.selenium.NoSuchSessionException;
 import org.openqa.selenium.grid.sessionmap.SessionMap;
+import org.openqa.selenium.internal.Require;
 import org.openqa.selenium.remote.HttpSessionId;
 import org.openqa.selenium.remote.SessionId;
 import org.openqa.selenium.remote.http.BinaryMessage;
@@ -53,11 +54,12 @@ public ProxyWebsocketsIntoGrid(HttpClient.Factory clientFactory, SessionMap sess
 
   @Override
   public Optional<Consumer<Message>> apply(String uri, Consumer<Message> downstream) {
-    Objects.requireNonNull(uri);
-    Objects.requireNonNull(downstream);
+    Require.nonNull("uri", uri);
+    Require.nonNull("downstream", downstream);
 
     Optional<SessionId> sessionId = HttpSessionId.getSessionId(uri).map(SessionId::new);
-    if (!sessionId.isPresent()) {
+    if (sessionId.isEmpty()) {
+      LOG.warning("Session not found for uri " + uri);
       return Optional.empty();
     }
 
@@ -72,7 +74,7 @@ public Optional<Consumer<Message>> apply(String uri, Consumer<Message> downstrea
       return Optional.of(upstream::send);
 
     } catch (NoSuchSessionException e) {
-      LOG.info("Attempt to connect to non-existent session: " + uri);
+      LOG.warning("Attempt to connect to non-existent session: " + uri);
       return Optional.empty();
     }
   }