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[Bug] Exception BeanCreationException quando rodo o projeto

Referente ao curso Spring Boot 3: aplique boas práticas e proteja uma API Rest, no capítulo Lidando com erros e atividade Tratando erro 400

por Breno Luis Souza Moura da Silva
| 234.2k xp | 286 posts

Criei a classe de tratar os erros. Mas quando rodo o projeto ele me traz essa exception:

Error starting ApplicationContext. To display the condition evaluation report re-run your application with 'debug' enabled.
2024-01-24T08:45:17.050-03:00 ERROR 16796 --- [  restartedMain] o.s.boot.SpringApplication               : Application run failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'handlerExceptionResolver' defined in class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Failed to instantiate [org.springframework.web.servlet.HandlerExceptionResolver]: Factory method 'handlerExceptionResolver' threw exception with message: Ambiguous @ExceptionHandler method mapped for [class org.springframework.web.bind.MethodArgumentNotValidException]: {public org.springframework.http.ResponseEntity br.com.autenticacaousuario.infra.exception.RestExceptionHandler.Error400(org.springframework.web.bind.MethodArgumentNotValidException), public final org.springframework.http.ResponseEntity org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler.handleException(java.lang.Exception,org.springframework.web.context.request.WebRequest) throws java.lang.Exception}

Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.HandlerExceptionResolver]: Factory method 'handlerExceptionResolver' threw exception with message: Ambiguous @ExceptionHandler method mapped for [class org.springframework.web.bind.MethodArgumentNotValidException]: {public org.springframework.http.ResponseEntity br.com.autenticacaousuario.infra.exception.RestExceptionHandler.Error400(org.springframework.web.bind.MethodArgumentNotValidException), public final org.springframework.http.ResponseEntity org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler.handleException(java.lang.Exception,org.springframework.web.context.request.WebRequest) throws java.lang.Exception}
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:177) ~[spring-beans-6.1.3.jar:6.1.3]
    at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:647) ~[spring-beans-6.1.3.jar:6.1.3]
    ... 22 common frames omitted

Caused by: java.lang.IllegalStateException: Ambiguous @ExceptionHandler method mapped for [class org.springframework.web.bind.MethodArgumentNotValidException]: {public org.springframework.http.ResponseEntity br.com.autenticacaousuario.infra.exception.RestExceptionHandler.Error400(org.springframework.web.bind.MethodArgumentNotValidException), public final org.springframework.http.ResponseEntity org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler.handleException(java.lang.Exception,org.springframework.web.context.request.WebRequest) throws java.lang.Exception}
    at org.springframework.web.method.annotation.ExceptionHandlerMethodResolver.addExceptionMapping(ExceptionHandlerMethodResolver.java:114) ~[spring-web-6.1.3.jar:6.1.3]
    at org.springframework.web.method.annotation.ExceptionHandlerMethodResolver.<init>(ExceptionHandlerMethodResolver.java:78) ~[spring-web-6.1.3.jar:6.1.3]
    at org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver.initExceptionHandlerAdviceCache(ExceptionHandlerExceptionResolver.java:289) ~[spring-webmvc-6.1.3.jar:6.1.3]
    at org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver.afterPropertiesSet(ExceptionHandlerExceptionResolver.java:256) ~[spring-webmvc-6.1.3.jar:6.1.3]
    at org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport.addDefaultHandlerExceptionResolvers(WebMvcConfigurationSupport.java:1063) ~[spring-webmvc-6.1.3.jar:6.1.3]
    at org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport.handlerExceptionResolver(WebMvcConfigurationSupport.java:1005) ~[spring-webmvc-6.1.3.jar:6.1.3]
    at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103) ~[na:na]
    at java.base/java.lang.reflect.Method.invoke(Method.java:580) ~[na:na]
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:140) ~[spring-beans-6.1.3.jar:6.1.3]
    ... 23 common frames omitted
2 respostas
por Breno Luis Souza Moura da Silva
| 234.2k xp | 286 posts
@RestControllerAdvice
public class RestExceptionHandler extends ResponseEntityExceptionHandler {

    @ExceptionHandler(EntityNotFoundException.class)
    public ResponseEntity<RestErrorMassege> Error404(EntityNotFoundException ex) {
        return ResponseEntity.notFound().build();
    }

    @ExceptionHandler(MethodArgumentNotValidException.class)
    public ResponseEntity<List<RestErrorMassege>> Error400(MethodArgumentNotValidException ex) {
        var erros = ex.getFieldErrors();
        return ResponseEntity.badRequest().body(
                erros.stream()
                        .map(RestErrorMassege::new)
                        .toList());
    }

}

public record RestErrorMessage(
        String field,
        String message
) {
    public RestErrorMassege(FieldError error) {
        this(error.getField(), error.getDefaultMessage());
    }
}
solução!
por Breno Luis Souza Moura da Silva
| 234.2k xp | 286 posts

Consegui solucionar deixando de fazer o extends. Dessa forma aqui:

@RestControllerAdvice
public class RestExceptionHandler {

    @ExceptionHandler(EntityNotFoundException.class)
    public ResponseEntity<RestErrorMessage> Error404() {
        return ResponseEntity.notFound().build();
    }

    @ExceptionHandler(MethodArgumentNotValidException.class)
    public ResponseEntity<List<RestErrorMessage>> Error400(MethodArgumentNotValidException ex) {
        var erros = ex.getFieldErrors();
        return ResponseEntity.badRequest().body(
                erros.stream()
                        .map(RestErrorMessage::new)
                        .toList());
    }

}