ex.getPropertyName() is not initialized in ResponseEntityExceptionHandler#handleTypeMismatch

[grundtein]

https://github.com/spring-projects/spring-framework/blob/main/spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/ResponseEntityExceptionHandler.java

Method:handleTypeMismatch

Object[] args = {ex.getPropertyName(), ex.getValue()};
String defaultDetail = "Failed to convert '" + args[0] + "' with value: '" + args[1] + "'";

If exception type is MethodArgumentTypeMismatchException,
return value of "ex.getPropertyName()" is null.
Therefore "defaultDetail" is "Failed to convert 'null' with value: 'val'";
But, return value of "ex.getName()" is correct property name.

Probably "TypeMismatchException#initPropertyName()" is not called.

[rstoyanchev]

Indeed, as we are using the property name now in the detail message, we should make sure it's initialied. Both handleTypeMismatch and handleConversionNotSupported.

[grundtein]

Thank you for your confirmation.