Implemented Exeption and their handling

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

@@ -1,10 +1,17 @@
 package mops.gruppen2.domain;
 
+import com.google.common.base.Throwables;
 import lombok.Getter;
+import mops.gruppen2.domain.Exceptions.EventException;
+import mops.gruppen2.domain.Exceptions.UserAlreadyExistsException;
 import mops.gruppen2.domain.event.Event;
 
+import javax.swing.table.TableRowSorter;
+import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 
+import static java.lang.String.format;
+
 /**
  * Repräsentiert viele Events als aggregiertes Objekt.
  */
@@ -18,13 +25,19 @@ public abstract class Aggregate {
      *
      * @param event Event, welches aggregiert wird
      */
-    public void applyEvent(Event event) {
+    public void applyEvent(Event event) throws EventException {
         try {
             Method method = this.getClass().getDeclaredMethod("applyEvent", event.getClass());
             method.setAccessible(true);
             method.invoke(this, event);
-        } catch (Exception e) {
+        }
+        catch (IllegalAccessException e) {
             e.printStackTrace();
+        } catch (NoSuchMethodException e) {
+            e.printStackTrace();
+        } catch (InvocationTargetException e) {
+            EventException f = (EventException) e.getTargetException();
+            throw f;
         }
     }
 }

src/main/java/mops/gruppen2/domain/Exceptions/EventException.java

@@ -0,0 +1,14 @@
+package mops.gruppen2.domain.Exceptions;
+
+public class EventException extends Exception {
+    private String msg;
+
+    public EventException(String msg) {
+        this.msg = msg;
+    }
+
+    @Override
+    public String getMessage() {
+        return msg;
+    }
+}

src/main/java/mops/gruppen2/domain/Exceptions/UserAlreadyExistsException.java

@@ -0,0 +1,7 @@
+package mops.gruppen2.domain.Exceptions;
+
+public class UserAlreadyExistsException extends EventException {
+   public UserAlreadyExistsException(String msg){
+       super(msg);
+    }
+}

src/main/java/mops/gruppen2/domain/Exceptions/UserNotFoundException.java

@@ -0,0 +1,7 @@
+package mops.gruppen2.domain.Exceptions;
+
+public class UserNotFoundException extends EventException{
+    public  UserNotFoundException(String msg){
+        super(msg);
+    }
+}

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

@@ -2,6 +2,8 @@ package mops.gruppen2.domain;
 
 import lombok.EqualsAndHashCode;
 import lombok.Getter;
+import mops.gruppen2.domain.Exceptions.UserAlreadyExistsException;
+import mops.gruppen2.domain.Exceptions.UserNotFoundException;
 import mops.gruppen2.domain.event.*;
 
 import java.util.*;
@@ -28,7 +30,7 @@ public class Group extends Aggregate {
         id = event.getGroup_id();
     }
 
-    private void applyEvent(UpdateRoleEvent event) {
+    private void applyEvent(UpdateRoleEvent event) throws UserNotFoundException {
         User user;
 
         Optional<User> userOptional = members.stream()
@@ -38,8 +40,7 @@ public class Group extends Aggregate {
         if (userOptional.isPresent()) {
             user = userOptional.get();
         } else {
-            System.out.println("UserNotFoundException");
-            return;
+            throw new UserNotFoundException("Nutzer wurde nicht gefunden!");
         }
 
         if (roles.containsKey(user) && event.getNewRole() == Role.STUDENT) {
@@ -49,11 +50,13 @@ public class Group extends Aggregate {
         }
     }
 
-    private void applyEvent(AddUserEvent event) {
+    private void applyEvent(AddUserEvent event) throws UserAlreadyExistsException {
         User user = new User(event.getUser_id(), event.getGivenname(), event.getFamilyname(), event.getEmail());
 
-        if (!this.members.contains(user)){
+        if (!this.members.contains(user)) {
             this.members.add(user);
+        } else {
+            throw new UserAlreadyExistsException("Nutzer bereits in Gruppe vorhanden!");
         }
     }
 

src/main/java/mops/gruppen2/service/GroupService.java

@@ -1,5 +1,6 @@
 package mops.gruppen2.service;
 
+import mops.gruppen2.domain.Exceptions.EventException;
 import mops.gruppen2.domain.Group;
 import mops.gruppen2.domain.event.Event;
 import org.springframework.stereotype.Service;
@@ -19,7 +20,13 @@ public class GroupService {
     Group buildGroupFromEvents(List<Event> eventList) {
         Group newGroup = new Group();
 
-        eventList.forEach(newGroup::applyEvent);
+        try {
+            for (Event event : eventList) {
+                newGroup.applyEvent(event);
+            }
+        }catch (EventException e){
+            e.printStackTrace();
+        }
 
         return newGroup;
     }