Spring Boot: custom and simple exception handler (using the default payload generated by Spring)

CustomExceptionHandler.java

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.dao.DataAccessException;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;
import org.springframework.web.context.request.WebRequest;
import java.time.LocalDateTime;
import java.util.Map;

@RestControllerAdvice
public class CustomExceptionHandler {

    private static final Logger logger = LoggerFactory.getLogger(CustomExceptionHandler.class);

    @ExceptionHandler(DataAccessException.class)
    public ResponseEntity<?> handleDatabaseErrors(Exception ex, WebRequest request) {

        logger.error("Catching an unhandled database exception thrown by a controller: " + ex.getLocalizedMessage(), ex);

        Map<String, Object> body = Map.of(
                "status", 500,
                "error", "Internal Server Error",
                "path", request.getDescription(false).replace("uri=", ""),
                "timestamp", LocalDateTime.now(),
                "message", "Ocorreu um erro interno. Por favor contate o administrador."
        );
        return ResponseEntity
                .internalServerError().body(body);
    }
}

Since Spring Boot 2.6.x we need to include server errors explicitly, stacktrace etc.

So, configure your application.properties like this:

server.error.include-message=always
server.error.include-binding-errors=always
server.error.include-stacktrace=on_param
server.error.include-exception=false

Or configure your application.yml like this:

server:
  error:
    include-message: always
    include-binding-errors: always
    include-stacktrace: on_param
    include-exception: false