put login-view.fxml in resources

src/main/java/team/elrant/bubbles/gui/LoginApplication.java

@@ -4,12 +4,13 @@
 import javafx.fxml.FXMLLoader;
 import javafx.scene.Scene;
 import javafx.stage.Stage;
+
 import java.io.IOException;
 
 public class LoginApplication extends Application {
     @Override
     public void start(@org.jetbrains.annotations.NotNull Stage stage) throws IOException {
-        FXMLLoader fxmlLoader = new FXMLLoader(LoginApplication.class.getResource("login-view.fxml"));
+        FXMLLoader fxmlLoader = new FXMLLoader(LoginApplication.class.getResource("/login-view.fxml"));
         Scene scene = new Scene(fxmlLoader.load(), 320, 240);
         stage.setTitle("Login");
         stage.setScene(scene);

src/main/resources/login-view.fxml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<?import javafx.scene.control.*?>
+<?import javafx.scene.layout.*?>
+<?import javafx.scene.text.*?>
+
+<Pane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="183.0" prefWidth="257.0" xmlns="http://javafx.com/javafx/17.0.2-ea" xmlns:fx="http://javafx.com/fxml/1" fx:controller="team.elrant.bubbles.gui.LoginController">
+   <Label layoutX="14.0" layoutY="61.0" text="Username">
+      <font>
+         <Font name="Segoe UI Semibold" size="12.0"/>
+      </font>
+   </Label>
+   <TextField fx:id="username_field" layoutX="94.0" layoutY="57.0" promptText="MarioRossi"/>
+   <Label layoutX="15.0" layoutY="95.0" text="Password">
+      <font>
+         <Font name="Segoe UI Semibold" size="12.0"/>
+      </font>
+   </Label>
+   <PasswordField fx:id="password_field" layoutX="94.0" layoutY="91.0" promptText="********"/>
+   <Label alignment="CENTER" contentDisplay="CENTER" maxWidth="-Infinity" minWidth="-Infinity" prefHeight="44.0"
+          prefWidth="257.0" text="Login" textAlignment="CENTER">
+      <font>
+         <Font name="Segoe UI Semibold" size="25.0"/>
+      </font>
+   </Label>
+   <Button layoutX="191.0" layoutY="144.0" mnemonicParsing="false" onAction="#onSubmitButtonClick" text="Submit"/>
+</Pane>