slight changes to package structure + naming

src/main/java/mops/gruppen2/domain/Admin.java

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+package mops.gruppen2.domain;
+
+public class Admin extends Role {
+}

src/main/java/mops/gruppen2/domain/Aggregate.java

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+package mops.gruppen2.domain;
+
+import mops.gruppen2.domain.event.Event;
+
+import java.lang.reflect.Method;
+
+public abstract class Aggregate {
+
+    /**
+     * Ruft die spezifische applyEvent-Methode im entsprechenden Aggregat auf.
+     *
+     * @param event
+     */
+    public void applyEvent(Event event) {
+        try {
+            Method method = this.getClass().getDeclaredMethod("applyEvent", event.getClass());
+            method.setAccessible(true);
+            method.invoke(this, event);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+}

src/main/java/mops/gruppen2/domain/Group.java

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+package mops.gruppen2.domain;
+
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import mops.gruppen2.domain.event.*;
+import mops.gruppen2.domain.event.AddUserEvent;
+import mops.gruppen2.domain.event.CreateGroupEvent;
+import mops.gruppen2.domain.event.UpdateGroupDescriptionEvent;
+import mops.gruppen2.domain.event.UpdateGroupTitleEvent;
+import mops.gruppen2.domain.event.DeleteUserEvent;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+@EqualsAndHashCode(callSuper=false)
+@Data
+public class Group extends Aggregate {
+	long id;
+	String titel;
+	String beschreibung;
+	List<User> teilnehmersList;
+	Map<User, Role> rollenList;
+
+	public void applyEvent(CreateGroupEvent event){
+		this.id = event.getGruppe_id();
+		this.titel = event.getTitel();
+		this.beschreibung = event.getBeschreibung();
+		this.teilnehmersList = new ArrayList<>();
+		this.rollenList = new HashMap<>();
+	}
+
+	public void applyEvent(UpdateRoleEvent event) {
+		teilnehmersList.stream()
+				.filter(user -> user.getId().equals(event.getUser_id()))
+				.findFirst()
+				.ifPresentOrElse(user -> rollenList.put(user, event.getRole()),
+						() -> System.out.println("UserNotFoundException"));
+	}
+
+	public void  applyEvent(AddUserEvent event){
+		User user = new User();
+
+		user.setId(event.getUser_id());
+		user.setVorname(event.getVorname());
+		user.setNachname(event.getNachname());
+		user.setEmail(event.getEmail());
+
+		this.teilnehmersList.add(user);
+	}
+
+	public void applyEvent(UpdateGroupTitleEvent event) {
+		this.titel = event.getTitel();
+	}
+
+	public void applyEvent(UpdateGroupDescriptionEvent event) {
+		this.beschreibung = event.getBeschreibung();
+	}
+
+	public void applyEvent(DeleteUserEvent event) {
+		for (User user : teilnehmersList) {
+			if (user.getId().equals(event.getUser_id())) {
+				this.teilnehmersList.remove(user);
+				break;
+			}
+		}
+	}
+}

src/main/java/mops/gruppen2/domain/Org.java

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+package mops.gruppen2.domain;
+
+public class Org extends Role {
+}

src/main/java/mops/gruppen2/domain/Role.java

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+package mops.gruppen2.domain;
+
+public class Role {
+
+}

src/main/java/mops/gruppen2/domain/User.java

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+package mops.gruppen2.domain;
+
+import lombok.Data;
+
+import java.util.List;
+
+@Data
+public class User {
+	String id;
+	String vorname;
+	String nachname;
+	String email;
+	List<Group> gruppen;
+}

src/main/java/mops/gruppen2/domain/event/AddUserEvent.java

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+package mops.gruppen2.domain.event;
+
+import lombok.Getter;
+
+@Getter
+public class AddUserEvent extends Event{
+	String vorname, nachname, email;
+
+	public AddUserEvent(long id, long gruppe_id, String user_id, String vorname, String nachname, String email) {
+		super(id, gruppe_id, user_id);
+		this.vorname = vorname;
+		this.nachname = nachname;
+		this.email = email;
+	}
+}

src/main/java/mops/gruppen2/domain/event/CreateGroupEvent.java

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+package mops.gruppen2.domain.event;
+
+import lombok.Getter;
+
+@Getter
+public class CreateGroupEvent extends Event {
+	String titel;
+	String beschreibung;
+
+	public CreateGroupEvent(long id, long gruppe_id, String user_id, String titel, String beschreibung) {
+		super(id, gruppe_id, user_id);
+		this.titel = titel;
+		this.beschreibung = beschreibung;
+	}
+}

src/main/java/mops/gruppen2/domain/event/DeleteUserEvent.java

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+package mops.gruppen2.domain.event;
+
+import lombok.Getter;
+
+@Getter
+public class DeleteUserEvent extends Event{
+
+    public DeleteUserEvent(long id, long gruppe_id, String user_id) {
+        super(id, gruppe_id, user_id);
+    }
+}

src/main/java/mops/gruppen2/domain/event/Event.java

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+package mops.gruppen2.domain.event;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+@Getter
+@AllArgsConstructor
+public class Event {
+	long id;
+	long gruppe_id;
+	String user_id;
+}

src/main/java/mops/gruppen2/domain/event/UpdateGroupDescriptionEvent.java

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+package mops.gruppen2.domain.event;
+
+import lombok.Getter;
+
+@Getter
+public class UpdateGroupDescriptionEvent extends Event {
+    String beschreibung;
+
+    public UpdateGroupDescriptionEvent(long id, long gruppe_id, String user_id, String beschreibung) {
+        super(id, gruppe_id, user_id);
+        this.beschreibung = beschreibung;
+    }
+}

src/main/java/mops/gruppen2/domain/event/UpdateGroupTitleEvent.java

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+package mops.gruppen2.domain.event;
+
+import lombok.Getter;
+
+@Getter
+public class UpdateGroupTitleEvent extends Event {
+    String titel;
+
+    public UpdateGroupTitleEvent(long id, long gruppe_id, String user_id, String titel) {
+        super(id, gruppe_id, user_id);
+        this.titel = titel;
+    }
+}

src/main/java/mops/gruppen2/domain/event/UpdateRoleEvent.java

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+package mops.gruppen2.domain.event;
+
+import lombok.Getter;
+import mops.gruppen2.domain.Role;
+
+@Getter
+public class UpdateRoleEvent extends Event {
+
+    private final Role role;
+
+    public UpdateRoleEvent(long id, long gruppe_id, String user_id, Role newRole) {
+        super(id, gruppe_id, user_id);
+
+        this.role = newRole;
+    }
+}