Polish SPR-11963

spring-websocket/src/main/java/org/springframework/web/socket/sockjs/transport/handler/AbstractHttpReceivingTransportHandler.java

@@ -55,12 +55,11 @@ public abstract class AbstractHttpReceivingTransportHandler extends AbstractTran
 			messages = readMessages(request);
 		}
 		catch (IOException ex) {
-			if(ex.getClass().getName().contains("Mapping")) {
 			logger.error("Failed to read message", ex);
+			if(ex.getClass().getName().contains("Mapping")) {
 				handleReadError(response, "Payload expected.", sockJsSession.getId());
 			}
 			else {
-				logger.error("Failed to read message", ex);
 				handleReadError(response, "Broken JSON encoding.", sockJsSession.getId());
 			}
 			return;