--- a/src/java.net.http/share/classes/jdk/internal/net/http/websocket/WebSocketImpl.java	Tue Mar 20 10:19:00 2018 +0000
+++ b/src/java.net.http/share/classes/jdk/internal/net/http/websocket/WebSocketImpl.java	Tue Mar 20 13:10:09 2018 +0000
@@ -721,6 +721,7 @@
         inputClosed = true;
         outputClosed.set(true);
         if (!this.error.compareAndSet(null, error) || !trySetState(ERROR)) {
+            debug.log(Level.DEBUG, "signalError", error);
             Log.logError(error);
         } else {
             close();