diff --git a/src/main/java/fr/plil/sio/persistence/jpa/UserServiceJpa.java b/src/main/java/fr/plil/sio/persistence/jpa/UserServiceJpa.java
index f950761..e44ffdf 100644
--- a/src/main/java/fr/plil/sio/persistence/jpa/UserServiceJpa.java
+++ b/src/main/java/fr/plil/sio/persistence/jpa/UserServiceJpa.java
@@ -1,29 +1,100 @@
 package fr.plil.sio.persistence.jpa;
 
+import fr.plil.sio.persistence.api.Group;
 import fr.plil.sio.persistence.api.Right;
 import fr.plil.sio.persistence.api.User;
 import fr.plil.sio.persistence.api.UserService;
+import java.util.List;
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 
 @Service
 public class UserServiceJpa implements UserService {
+    
+    @Autowired
+    private UserRepository userRepository;
+    
+    @Autowired
+    private GroupRepository groupRepository;
+    
+    @Autowired
+    private RightRepository rightRepository;
+    
     @Override
     public User create(String name, String groupName) {
-        return null;
+        
+        if(name==null || groupName==null){
+            throw new IllegalArgumentException("name cannot be null");
+        }
+        
+        Group group = new Group();
+        group = groupRepository.findByName(groupName);
+        User user = userRepository.findByName(name);
+        
+        if(group==null){
+            throw new IllegalArgumentException("group trouve avec le find by name null");
+        }
+        
+        if(user!=null){
+            throw new IllegalStateException("a user with the same name already exists");
+        }
+        
+        user = new User();
+        user.setName(name);
+        
+        if(group!=null)
+            user.setGroup(group);
+        
+        group.getUsers().add(user);
+        
+        userRepository.save(user);
+        
+        return user;
     }
 
     @Override
     public boolean delete(String name) {
-        return false;
+        if(name == null){
+            throw new IllegalArgumentException("name cannot be null");
+        }
+        User user = findByName(name);
+        if(user==null){
+            return false;
+        }
+        userRepository.delete(user.getId());
+        return true;
     }
 
     @Override
     public User findByName(String name) {
-        return null;
+        if(name==null){
+            throw new IllegalArgumentException("name cannot be null");
+        }
+        return userRepository.findByName(name);
     }
 
     @Override
     public boolean isUserHasRight(String userName, Right right) {
+        if(userName==null){
+            throw new IllegalArgumentException("userName cannot be null");
+        }
+        if(right==null){
+            throw new IllegalArgumentException("right cannot be null");
+        }
+        
+        if(rightRepository.findByName(right.getName()).size() == 0){
+            throw new IllegalArgumentException("right does not exists");
+        }
+        
+        User user = userRepository.findByName(userName);
+        Group group = user.getGroup();
+        List<Right> list = group.getRights();
+        
+        if(list.contains(right) || list.contains(right.getParent())){
+            return true;
+        }
+        
+        
         return false;
     }
 }
--
libgit2 0.21.2