How I can call method using web client? - spring

Question

I wanna show new scene (JavaFX) when my post-request will be successfully completed, and show alerts when it will be 5xx/4xx errors.
When i try to do this using WebFlux library, I getting error like "Bad return type in lambda expression: Optional cannot be converted to Mono<? extends Throwable>"
AuthController.java
buttonAuth.setOnAction(
actionEvent -> {
UserAuth userAuth = UserAuth
.builder()
.login(loginAuth.getText())
.password(passAuth.getText())
.build();
webClient.post()
.uri("http://localhost:10120/message/authorization")
.contentType(MediaType.APPLICATION_JSON)
.bodyValue(userAuth)
.retrieve()
.onStatus(
HttpStatus::is5xxServerError,
response -> alertService.showAlert(Alert.AlertType.ERROR, "Error",
"Server error", false))
.onStatus(
HttpStatus::is4xxClientError,
response -> alertService.showAlert(Alert.AlertType.ERROR, "Error",
"Client error", false))
.onStatus(
HttpStatus.OK,
response -> Platform.runLater(()-> {setScene(buttonAuth,"Main Menu", MainMenuController.class, fxWeaver);}))
.bodyToMono(Void.class)
.block();
}
});
UserAuth.java
import lombok.*;
#Data
#NoArgsConstructor
#AllArgsConstructor
#Getter
#Setter
#ToString
#Builder(toBuilder = true)
public class UserAuth {
public String login;
public String password;
}
AlertService.java
import javafx.scene.control.Alert;
import javafx.scene.control.ButtonType;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;
import java.util.Optional;
#Service
#RequiredArgsConstructor
public class AlertService {
public Optional<ButtonType> showAlert(Alert.AlertType type, String title, String content, boolean NeedToReturnResult) {
Alert alert = new Alert(type);
alert.setTitle(title);
alert.setContentText(content);
alert.setHeaderText(null);
Optional<ButtonType> result = alert.showAndWait();
if (NeedToReturnResult) return result;
else {
return null;
}
}
}
BaseController.java --- need to set scene when request successfully completed
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Hyperlink;
import javafx.scene.control.PasswordField;
import javafx.scene.control.TextField;
import javafx.stage.Stage;
import net.rgielen.fxweaver.core.FxWeaver;
import org.springframework.beans.factory.annotation.Autowired;
public abstract class BaseController {
#Autowired
private Stage stage;
public void setScene(Button button, String title, Class controller, FxWeaver fxWeaver) {
button.getScene().getWindow().hide();
Parent root = (Parent) fxWeaver.loadView(controller);
stage.setScene(new Scene(root));
stage.setTitle(title);
stage.setResizable(false);
stage.show();
}
public void setScene(Hyperlink link, String title, Class controller, FxWeaver fxWeaver) {
link.getScene().getWindow().hide();
Parent root = (Parent) fxWeaver.loadView(controller);
stage.setTitle(title);
stage.setResizable(false);
stage.setScene(new Scene(root));
stage.show();
}
public void clearFields(TextField firstNameReg, TextField secondNameReg, TextField loginReg, PasswordField passReg, TextField mailReg) {
firstNameReg.clear();
secondNameReg.clear();
loginReg.clear();
passReg.clear();
mailReg.clear();
}
public void clearFields(TextField login, PasswordField password) {
login.clear();
password.clear();
}
}
Server-part -- here I tried to send some statuses when get request, but i don't know how to do that right
#RequestMapping(
value = "/authorization",
method = RequestMethod.POST,
produces = MediaType.APPLICATION_JSON_VALUE)
public Flux<String> authorizationUser(#Valid UserDTO userDTO) {
log.info("[UserController.authorizationUser] personDTO = {}", userDTO);
log.info("[UserController.authorizationUser] personDTO = {}", userService.authorizationUser(userDTO).authorization);
if(userService.authorizationUser(userDTO).authorization){
return Flux.just("ok");
}else{
return Flux.just("bad_request");
}
}