Spring MVC jackson exception handling - json

Question

Can I handle Jackson UnrecognizedPropertyException for a #RequestBody parameter? How can I configure this?
I'm working on a spring MVC project, and I use jackson as json plugin. Any mis-spell of the field name in a json request will lead to a error page, which should be a json string consist of error message. I'm a newbie to spring, and I think this error handling can be done with some spring configuration, but failed after several attempts. Any help?
Here is my mvc configure:
#EnableWebMvc
public class WebMvcConfig extends WebMvcConfigurerAdapter {
#Bean
public ViewResolver resolver() {
InternalResourceViewResolver bean = new InternalResourceViewResolver();
return bean;
}
#Override
public void configureDefaultServletHandling(
DefaultServletHandlerConfigurer configurer) {
configurer.enable();
}
}
My controller:
#RequestMapping(value = "/Login", method = RequestMethod.POST,
consumes="application/json", produces = "application/json")
public #ResponseBody AjaxResponse login(
#RequestBody UserVO user, HttpServletRequest request) {
//do something ...
}
Normal request json is:
{"Username":"123123", "Password":"s3cret"}
But if I send the following request:
{"Username":"123123", "pwd":"s3cret"}
which field name is mis-spell, then Spring catch this UnrecognizedPropertyException, and returned a error page, but I want to catch this exception and return a json string. How can I achieve this?

Answer 1

Use #ExceptionHandler annotation. Some documentation about it: http://spring.io/blog/2013/11/01/exception-handling-in-spring-mvc
#Controller
public class WebMvcConfig {
#RequestMapping(value = "/Login", method = RequestMethod.POST,
consumes="application/json", produces = "application/json")
public #ResponseBody AjaxResponse login(#RequestBody UserVO user, HttpServletRequest request) {
//do something ...
}
#ExceptionHandler(UnrecognizedPropertyException.class)
public void errorHandler() {
// do something. e.g. customize error response
}
}