updates after code review

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/context/MessageSourceAutoConfiguration.java

@@ -95,8 +95,8 @@ public MessageSource messageSource(MessageSourceProperties properties) {
 messageSource.setCommonMessages(commonProperties);
 }
 }
-catch (IOException e) {
-throw new UncheckedIOException("Failed to load common messages", e);
+catch (IOException ex) {
+throw new UncheckedIOException("Failed to load common messages", ex);
 }
 return messageSource;
 }