diff --git a/client/app/src/main/java/main/MainApplication.java b/client/app/src/main/java/main/MainApplication.java
index ac5f771..2522e16 100644
--- a/client/app/src/main/java/main/MainApplication.java
+++ b/client/app/src/main/java/main/MainApplication.java
@@ -4,6 +4,7 @@ import javafx.application.Application;
 import javafx.fxml.FXMLLoader;
 import javafx.scene.Scene;
 import javafx.stage.Stage;
+import res.DataController;
 
 import java.io.IOException;
 import java.util.Objects;
@@ -17,7 +18,6 @@ public class MainApplication extends Application {
         scene.getStylesheets().add(Objects.requireNonNull(MainApplication.class.getResource("main-view.css")).toExternalForm());
         stage.setTitle("SharePlaner");
         stage.setScene(scene);
-        stage.show();
 
         FXMLLoader fxmlLoaderLogin = new FXMLLoader(MainApplication.class.getResource("../users/login.fxml"));
         Scene sceneLogin = new Scene(fxmlLoaderLogin.load(), 650, 500);
@@ -25,8 +25,11 @@ public class MainApplication extends Application {
         Stage stageLogin = new Stage();
         stageLogin.setTitle("Anmelden");
         stageLogin.setScene(sceneLogin);
-        stageLogin.show();
+        stageLogin.showAndWait();
 
+        if(DataController.USER_ID >= 0){
+            stage.show();
+        }
     }
 
     public static void main(String[] args) {
diff --git a/client/app/src/main/java/users/LoginControler.java b/client/app/src/main/java/users/LoginControler.java
deleted file mode 100644
index df20ac2..0000000
--- a/client/app/src/main/java/users/LoginControler.java
+++ /dev/null
@@ -1,4 +0,0 @@
-package users;
-
-public class LoginControler {
-}
diff --git a/client/app/src/main/java/users/LoginController.java b/client/app/src/main/java/users/LoginController.java
new file mode 100644
index 0000000..ebb330f
--- /dev/null
+++ b/client/app/src/main/java/users/LoginController.java
@@ -0,0 +1,49 @@
+package users;
+
+import javafx.event.ActionEvent;
+import javafx.fxml.FXML;
+import javafx.scene.Node;
+import javafx.scene.control.Label;
+import javafx.scene.control.TextField;
+import javafx.stage.Stage;
+import res.DataController;
+
+public class LoginController {
+    @FXML
+    public TextField userField;
+    @FXML
+    public TextField passField;
+    @FXML
+    public Label userErrLabel;
+    @FXML
+    public Label passErrLabel;
+
+    @FXML
+    protected void login(ActionEvent event){
+        if(userField.getText().trim().isEmpty()){
+            userErrLabel.setText("Bitte laginnamen eingeben!");
+            return;
+        }
+        if(passField.getText().trim().isEmpty()){
+            userErrLabel.setText("");
+            passErrLabel.setText("Bitte passwort eingeben!");
+            return;
+        }
+
+        DataController dataController = new DataController();
+        if(!dataController.login(userField.getText(), passField.getText())){
+            userErrLabel.setText("Name und Passwort passen nicht zueinander!");
+            passErrLabel.setText("Name und Passwort passen nicht zueinander!");
+            return;
+        }
+
+        Stage stage = (Stage) ((Node) event.getSource()).getScene().getWindow();
+        stage.close();
+    }
+
+    @FXML
+    protected void abortBtnClick(ActionEvent event) {
+        Stage stage = (Stage) ((Node) event.getSource()).getScene().getWindow();
+        stage.close();
+    }
+}
diff --git a/client/app/src/main/resources/users/login.fxml b/client/app/src/main/resources/users/login.fxml
index 39752ca..a54a36f 100644
--- a/client/app/src/main/resources/users/login.fxml
+++ b/client/app/src/main/resources/users/login.fxml
@@ -1,12 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
-<?import java.lang.*?>
-<?import java.util.*?>
-<?import javafx.scene.*?>
 <?import javafx.scene.control.*?>
 <?import javafx.scene.layout.*?>
-
-<GridPane xmlns="http://javafx.com/javafx" xmlns:fx="http://javafx.com/fxml"  fx:controller="users.LoginControler">
+<GridPane xmlns="http://javafx.com/javafx" xmlns:fx="http://javafx.com/fxml" fx:controller="users.LoginController">
 
     <columnConstraints>
         <ColumnConstraints/>
@@ -23,14 +19,14 @@
     <Label GridPane.columnIndex="1">Anmelden</Label>
 
     <Label GridPane.rowIndex="1">Username</Label>
-    <TextField GridPane.columnIndex="1" GridPane.rowIndex="1" fx:id="userField"></TextField>
-    <Label GridPane.columnIndex="2" GridPane.rowIndex="1" fx:id="userErrLabel">Error</Label>
+    <TextField GridPane.columnIndex="1" GridPane.rowIndex="1" fx:id="userField" />
+    <Label GridPane.columnIndex="2" GridPane.rowIndex="1" fx:id="userErrLabel"/>
 
     <Label GridPane.rowIndex="2">Paswort</Label>
-    <PasswordField GridPane.columnIndex="1" GridPane.rowIndex="2" fx:id="passField"></PasswordField>
-    <Label GridPane.columnIndex="2" GridPane.rowIndex="2" fx:id="passErrLabel">Error</Label>
+    <PasswordField GridPane.columnIndex="1" GridPane.rowIndex="2" fx:id="passField" />
+    <Label GridPane.columnIndex="2" GridPane.rowIndex="2" fx:id="passErrLabel"/>
 
-    <Button GridPane.columnIndex="1" GridPane.rowIndex="3">Beenden</Button>
-    <Button GridPane.columnIndex="2" GridPane.rowIndex="3">Anmelden</Button>
+    <Button onAction="#abortBtnClick" GridPane.columnIndex="1" GridPane.rowIndex="3">Beenden</Button>
+    <Button onAction="#login" GridPane.columnIndex="2" GridPane.rowIndex="3">Anmelden</Button>
 
 </GridPane>
diff --git a/client/data/src/main/java/res/DataController.java b/client/data/src/main/java/res/DataController.java
index 84e5cad..88566b6 100644
--- a/client/data/src/main/java/res/DataController.java
+++ b/client/data/src/main/java/res/DataController.java
@@ -14,10 +14,13 @@ import java.util.*;
 
 public class DataController {
 
+    public static long USER_ID = -1;
+
     private static final String ALL_EVENTS_ENDPOINT = "http://localhost:8080/vpr/all-events";
     private static final String ALL_USERS_ENDPOINT = "http://localhost:8080/vpr/all-users";
     private static final String ADD_EVENT_ENDPOINT = "http://localhost:8080/vpr/add-event";
     private static final String DELETE_EVENT_ENDPOINT = "http://localhost:8080/vpr/del-event";
+    private static final String LOGIN_ENDPOINT = "http://localhost:8080/vpr/login";
 
     private final HttpRequest httpRequest;
 
@@ -25,6 +28,20 @@ public class DataController {
         httpRequest = new HttpRequest();
     }
 
+    public boolean login(String username, String password){
+        try {
+            USER_ID = Long.parseLong(httpRequest.sendPostRequest(
+                    LOGIN_ENDPOINT,
+                    "login=" + username
+                    + "&password=" + password
+            ));
+        } catch (Exception e) {
+            e.printStackTrace();
+            return false;
+        }
+        return USER_ID >= 0;
+    }
+
     public void createEvent(Event event){
         try {
             System.out.println(httpRequest.sendPostRequest(ADD_EVENT_ENDPOINT, event.getAsUrlParam()));
@@ -45,7 +62,7 @@ public class DataController {
         ArrayList<Event> eventList = new ArrayList<>();
 
         try {
-            String jsonResponse = httpRequest.sendPostRequest(ALL_EVENTS_ENDPOINT, "userId=1");
+            String jsonResponse = httpRequest.sendPostRequest(ALL_EVENTS_ENDPOINT, "userId=" + USER_ID);
             System.out.println(jsonResponse);
 
             ObjectMapper objectMapper = new ObjectMapper();