Raouf25

<dependency>
    <groupId>com.pivovarit</groupId>
    <artifactId>throwing-function</artifactId>
    <version>1.5.0</version>
</dependency>

Raouf25

import lombok.Getter;
import lombok.Setter;
import lombok.extern.slf4j.Slf4j;

import java.util.Arrays;
import java.util.List;

@Getter
@Setter
@Slf4j

Raouf25

public class ResourceNotFoundException extends BackendException {
    public ResourceNotFoundException(Integer id, String message) {
        super(ErrorEnum.RESOURCE_NOT_FOUND, "%s id = %s not found", message, id);
    }
}

Raouf25

import lombok.Getter;
import lombok.RequiredArgsConstructor;
import org.springframework.http.HttpStatus;

@Getter
@RequiredArgsConstructor
public enum ErrorEnum {
    CLIENT_UNAVAILABLE_ERROR("Service unavailable.", HttpStatus.BAD_REQUEST),
    RESOURCE_NOT_FOUND("Resource not found.", HttpStatus.NOT_FOUND);
    private final String message;

Raouf25

public class ClientUnavailableException extends BackendException {
    public ClientUnavailableException(String message) {
        super(ErrorEnum.CLIENT_UNAVAILABLE_ERROR, "%s is unavailable", message);
    }
}

Raouf25

public Agreement getById(Integer id) throws BackendException {
        try {
            AgreementDto agreementDto = this.agreementClientService.get(id);
            return mapper.map(agreementDto, Agreement.class);
        } catch (ResourceAccessException e) {
            throw new CatalogClientUnavailableException();
        } catch (CatalogException e) {
            throw new ResourceNotFoundException(id, "Agreement");
        }
    }

Raouf25

@ControllerAdvice
@CrossOrigin
public class ExceptionHandlerController {

    @ExceptionHandler({ClientUnavailableException.class})
    public ResponseEntity<ErrorAndCodeResponse> badRequest(BackendException e) {
        ErrorAndCodeResponse error = new ErrorAndCodeResponse(e.getCode().name(), e.getCode().getMessage(), e.getAdditionalInfo());
        return new ResponseEntity<>(error, HttpStatus.BAD_REQUEST);
    }

Raouf25

List list = new ArrayList();
list.add(10);
list.add("10");

Raouf25

List<Integer> list = new ArrayList<Integer>();
list.add(10);
list.add("10");// compile-time error

Raouf25

List list = new ArrayList();
list.add("hello");
String s = (String) list.get(0);//typecasting