diff --git a/fh.fd.ci.server/src/main/java/de/fd/fh/ServerApp.java b/fh.fd.ci.server/src/main/java/de/fd/fh/ServerApp.java
index 384d27c..d275c81 100644
--- a/fh.fd.ci.server/src/main/java/de/fd/fh/ServerApp.java
+++ b/fh.fd.ci.server/src/main/java/de/fd/fh/ServerApp.java
@@ -1,12 +1,57 @@
 package de.fd.fh;
 
+import de.fd.fh.server.access.AccessContextEventListener;
+import de.fd.fh.server.access.AccessRepository;
+import de.fd.fh.server.access.AccessService;
+import de.fd.fh.server.access.web.AccessController;
+import de.fd.fh.server.user.UserContextEventListener;
+import de.fd.fh.server.user.web.UserController;
+import de.fd.fh.server.user.UserRepository;
+import de.fd.fh.server.user.UserService;
+
+
+import java.util.HashSet;
+import java.util.Observable;
+import java.util.Observer;
+import java.util.Set;
+
 import static spark.Spark.*;
 
 public class ServerApp
 {
+    private static AccessRepository accessRepository;
+    private static UserRepository userRepository;
+
+    private static final Set<Observer> listeners = new HashSet<>();
 
     public static void main(String[] args)
     {
+        initRepositories();
+
+        initListeners();
+
+        new AccessController((AccessService) addListeners(new AccessService(accessRepository)));
+        new UserController((UserService) addListeners(new UserService(userRepository)));
+
         get("/hello", (req, res) -> "Hello World");
+
+    }
+
+    private static Object addListeners(Observable service)
+    {
+        listeners.forEach(service::addObserver);
+
+        return service;
+    }
+
+    private static void initListeners()
+    {
+        listeners.add(new AccessContextEventListener(accessRepository));
+        listeners.add(new UserContextEventListener(userRepository));
+    }
+
+    private static void initRepositories() {
+        accessRepository = new AccessRepository();
+        userRepository = new UserRepository();
     }
 }
diff --git a/fh.fd.ci.server/src/main/java/de/fd/fh/server/user/UserService.java b/fh.fd.ci.server/src/main/java/de/fd/fh/server/user/UserService.java
new file mode 100644
index 0000000..268e695
--- /dev/null
+++ b/fh.fd.ci.server/src/main/java/de/fd/fh/server/user/UserService.java
@@ -0,0 +1,48 @@
+package de.fd.fh.server.user;
+
+import de.fd.fh.server.user.events.ChangePasswordEvent;
+import de.fd.fh.server.user.web.ChangeUserRequest;
+import de.fd.fh.server.user.web.UserRequest;
+import lombok.RequiredArgsConstructor;
+
+import java.util.Observable;
+
+@RequiredArgsConstructor
+public class UserService extends Observable
+{
+    private final UserRepository userRepository;
+
+    public User changePlayer(final UserId userId, final ChangeUserRequest message)
+    {
+        System.out.println("changePlayer: " + message);
+
+        User user = userRepository.findUserById(userId);
+
+        if (message.getPassword() != null)
+        {
+            setChanged();
+            notifyObservers(new ChangePasswordEvent(userId, message.getPassword()));
+        }
+
+        userRepository.save(user);
+
+        return userRepository.findUserById(userId);
+    }
+
+    public User getPlayer(final UserId id)
+    {
+        return userRepository.findUserById(id);
+    }
+
+    public UserRequest getSmallPlayer(final UserId userId)
+    {
+        final User user = userRepository.findUserById(userId);
+
+        if(user == null)
+        {
+            return null;
+        }
+
+        return new UserRequest(user.getId().getIdentifier(), user.getName());
+    }
+}
diff --git a/fh.fd.ci.server/src/test/java/de/fd/fh/server/user/UserServiceTest.java b/fh.fd.ci.server/src/test/java/de/fd/fh/server/user/UserServiceTest.java
new file mode 100644
index 0000000..1c3bcbf
--- /dev/null
+++ b/fh.fd.ci.server/src/test/java/de/fd/fh/server/user/UserServiceTest.java
@@ -0,0 +1,84 @@
+package de.fd.fh.server.user;
+
+import de.fd.fh.server.user.web.ChangeUserRequest;
+import de.fd.fh.server.user.web.UserRequest;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.mockito.ArgumentCaptor;
+
+import java.util.Observable;
+import java.util.Observer;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.*;
+
+class UserServiceTest implements Observer
+{
+    private Object event;
+
+    @BeforeEach
+    void before()
+    {
+        event = null;
+    }
+
+    @Test
+    void given_storedUser_when_changePassword_should_changePassword()
+    {
+        final User user =
+                User.of("testName");
+        final ChangeUserRequest request =
+                new ChangeUserRequest("testName", "newPassword");
+        final UserRepository repository = mock(UserRepository.class);
+        when(repository.findUserById(any(UserId.class)))
+                .thenReturn(user);
+
+        final UserService service = new UserService(repository);
+        service.addObserver(this);
+        final ArgumentCaptor<User> captor = ArgumentCaptor.forClass(User.class);
+
+        service.changePlayer(UserId.of("12345"), request);
+        verify(repository).save(captor.capture());
+
+        assertNotNull(captor.getValue(), "Should be saved");
+        assertNotNull(event);
+    }
+
+    @Test
+    void given_storedUser_when_getPlayer_should_returnPlayer()
+    {
+        final User user =
+                User.of("testName");
+        final UserRepository repository = mock(UserRepository.class);
+        when(repository.findUserById(any(UserId.class)))
+                .thenReturn(user);
+
+        final User result = new UserService(repository).getPlayer(UserId.of("12345"));
+
+        assertNotNull(result);
+    }
+
+    @Test
+    void given_storedUser_when_getSmallPlayer_should_returnSmallPlayer()
+    {
+        final User user =
+                new User(UserId.of("12345"), "testName");
+        final UserRepository repository = mock(UserRepository.class);
+        when(repository.findUserById(any(UserId.class)))
+                .thenReturn(user);
+
+        final UserRequest result = new UserService(repository).getSmallPlayer(UserId.of("12345"));
+
+        assertNotNull(result);
+        assertEquals("12345", result.getId(), "Wrong UserId");
+        assertEquals("testName", result.getName(), "Wrong Name");
+
+    }
+
+    @Override
+    public void update(Observable o, Object arg)
+    {
+        event = arg;
+    }
+}
\ No newline at end of file