surya surya - 1 month ago 13
Java Question

javax bean validation not working on method parameters

javax validation not working on method parameters.. This is a test code and none of javax validation works on method parameter...

@RequestMapping(value = "/{id}", method = RequestMethod.PUT, params = "action=testAction")
public Test update(
@Size(min = 1) @RequestBody List<String> ids,
@Min(3) @PathVariable String name) {
return doSomething(ids, name);
}


But i have class level validations which works perfectly...

@RequestMapping(method = RequestMethod.POST)
@ResponseStatus(HttpStatus.CREATED)
public RoleType create (@RequestBody @Validated(FieldType.class) User user) {
...
}


And

@Size(min = 2, max = 10, groups = { FieldType.class }, message = "Invalid user code")
public String getId() {
return _id ;
}


-- Solution --

all steps followed as per the accepted answer.
And another addition is annoation on class level

@Validated
class UserController
{
@RequestMapping(value = "/{id}", method = RequestMethod.PUT, params ="action=testAction")
public Test update(@Size(min = 1) @RequestBody List<String> ids,@Min(3) @PathVariable String name) {
return doSomething(ids, name);
}
}

Answer

you need to register MethodValidationPostProcessor bean to kick method level validation annotation

delegates to a JSR-303 provider for performing method-level validation on annotated methods.

  @Bean
     public MethodValidationPostProcessor methodValidationPostProcessor() {
          return new MethodValidationPostProcessor();
     }

then,

@RequestMapping(value = "/{id}", method = RequestMethod.PUT)
public Test update(
        @Size(min = 1) @RequestBody List<String> ids,
        @Min(3) @PathVariable("id") String name) {
    return doSomething(ids, name);
}

if you want to handle validation exception

@ExceptionHandler(value = { ConstraintViolationException.class })
 @ResponseStatus(value = HttpStatus.BAD_REQUEST)
 public String handleResourceNotFoundException(ConstraintViolationException e) {
      Set<ConstraintViolation<?>> violations = e.getConstraintViolations();
      StringBuilder strBuilder = new StringBuilder();
      for (ConstraintViolation<?> violation : violations ) {
           strBuilder.append(violation.getMessage() + "\n");
      }
      return strBuilder.toString();
 }