Adjust log level in LoggingWebSocketHandlerDecorator

spring-websocket/src/main/java/org/springframework/web/socket/handler/LoggingWebSocketHandlerDecorator.java

@@ -57,11 +57,8 @@ public class LoggingWebSocketHandlerDecorator extends WebSocketHandlerDecorator
 
 	@Override
 	public void handleTransportError(WebSocketSession session, Throwable exception) throws Exception {
-		if (logger.isDebugEnabled()) {
+		if (logger.isErrorEnabled()) {
-			logger.debug("Transport error for " + session + ": " + exception);
+			logger.error("Transport error for " + session, exception);
-		}
-		else if (logger.isTraceEnabled()) {
-			logger.debug("Transport error for " + session, exception);
 		}
 		super.handleTransportError(session, exception);
 	}