diff --git a/src/main/java/fr/plil/sio/persistence/api/Right.java b/src/main/java/fr/plil/sio/persistence/api/Right.java
index 524c4af..b37eceb 100644
--- a/src/main/java/fr/plil/sio/persistence/api/Right.java
+++ b/src/main/java/fr/plil/sio/persistence/api/Right.java
@@ -31,12 +31,10 @@ public class Right implements Serializable{
     private String name;
 
     /// the parent right
-    @ManyToOne(optional = false)
-    @JoinColumn(name = "RIGHT_ID")
-    @Column(name = "PARENT_C")
+    @ManyToOne(optional = true)
     private Right parent;
     
-    @ManyToOne(optional = false)
+    @ManyToOne(optional = true)
     @JoinColumn(name = "GROUP_ID")
     private Group group;
 
diff --git a/src/main/java/fr/plil/sio/persistence/jpa/GroupServiceJpa.java b/src/main/java/fr/plil/sio/persistence/jpa/GroupServiceJpa.java
index 3302278..18463cb 100644
--- a/src/main/java/fr/plil/sio/persistence/jpa/GroupServiceJpa.java
+++ b/src/main/java/fr/plil/sio/persistence/jpa/GroupServiceJpa.java
@@ -29,7 +29,15 @@ public class GroupServiceJpa implements GroupService {
 
     @Override
     public boolean delete(String name) {
-        throw new IllegalStateException("not implemented !");
+        if(name == null)
+            throw new IllegalArgumentException("Name cannot be null");
+        
+        Group group = groupRepository.findByName(name);
+        if(group == null)
+            return false;
+        
+        groupRepository.delete(group);
+        return true;
     }
 
     @Override
@@ -42,6 +50,7 @@ public class GroupServiceJpa implements GroupService {
 
     @Override
     public boolean addRight(String groupName, Right right) {
+                       
         return false;
     }
 
diff --git a/src/main/java/fr/plil/sio/persistence/jpa/RightRepository.java b/src/main/java/fr/plil/sio/persistence/jpa/RightRepository.java
new file mode 100644
index 0000000..6aa776b
--- /dev/null
+++ b/src/main/java/fr/plil/sio/persistence/jpa/RightRepository.java
@@ -0,0 +1,10 @@
+package fr.plil.sio.persistence.jpa;
+
+import fr.plil.sio.persistence.api.Right;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface RightRepository extends JpaRepository<Right, Long> {
+    
+    Right findByName(String name);
+    
+}
diff --git a/src/main/java/fr/plil/sio/persistence/jpa/RightServiceJpa.java b/src/main/java/fr/plil/sio/persistence/jpa/RightServiceJpa.java
index 6b0f6d4..4a3b794 100644
--- a/src/main/java/fr/plil/sio/persistence/jpa/RightServiceJpa.java
+++ b/src/main/java/fr/plil/sio/persistence/jpa/RightServiceJpa.java
@@ -1,35 +1,81 @@
 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.RightService;
+import java.util.ArrayList;
 import org.springframework.stereotype.Service;
 
 import java.util.List;
+import org.springframework.beans.factory.annotation.Autowired;
 
 @Service
 public class RightServiceJpa implements RightService {
+    
+    @Autowired
+    private RightRepository rightRepository;
+    
     @Override
     public Right create(String name) {
-        return null;
+        if (name == null) {
+            throw new IllegalArgumentException("name cannot be null");
+        }
+        
+        List<Right> rights = new ArrayList<>();
+        
+        Right right = new Right();
+        right.setName(name);
+        
+        rights.add(right);
+        rightRepository.save(rights);
+        
+        return right;
     }
 
     @Override
     public Right create(String name, Right parent) {
-        return null;
+        if (name == null) {
+            throw new IllegalArgumentException("name cannot be null");
+        }
+       
+        List<Right> rights = new ArrayList<>();
+        
+        Right right = new Right();
+        right.setName(name);
+        right.setParent(parent);
+        rights.add(right);
+        rightRepository.save(rights);
+        
+        return right;
     }
 
     @Override
     public boolean delete(Right right) {
-        return false;
+        if(right == null)
+            throw new IllegalArgumentException("Right cannot be null");
+       
+        rightRepository.delete(right);        
+        return true;
     }
 
     @Override
-    public List<Right> findByName(String name) {
-        return null;
+    public List<Right> findByName(String name) {        
+         if(name == null)
+            throw new IllegalArgumentException("Name cannot be null");
+                 
+        Right right = rightRepository.findByName(name);
+        List<Right> rights = new ArrayList<>();
+        rights.add(right);
+        
+        return rights;
     }
 
     @Override
     public Right findOne(Long id) {
-        return null;
+        
+        if(id == null)
+            throw new IllegalArgumentException("Id cannot be null");        
+        
+        return rightRepository.findOne(id);
     }
 }
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..a9ef8ec 100644
--- a/src/main/java/fr/plil/sio/persistence/jpa/UserServiceJpa.java
+++ b/src/main/java/fr/plil/sio/persistence/jpa/UserServiceJpa.java
@@ -7,23 +7,57 @@ import org.springframework.stereotype.Service;
 
 @Service
 public class UserServiceJpa implements UserService {
+    
+    /*@Autowired
+    UserRepository userRepository;
+    GroupRepository groupRepository;    */
+    
     @Override
     public User create(String name, String groupName) {
+       /* if (name == null) {
+            throw new IllegalArgumentException("name cannot be null");
+        }
+        
+        User user = userRepository.findByName(name);
+        Group group = groupRepository.findByName(name);                
+        if (user != null) {
+            throw new IllegalStateException("a user with the same name already exists");
+        }
+        user = new User();
+        user.setName(name);
+        user.setGroup(group);
+        userRepository.save(user);*/
         return null;
     }
 
     @Override
     public boolean delete(String name) {
+       /* if(name == null){
+            return false;
+        }
+        User user = userRepository.findByName(name);
+        
+        userRepository.delete(user);*/
+        
         return false;
     }
 
     @Override
     public User findByName(String name) {
+        /*if (name == null) {
+            throw new IllegalArgumentException("name cannot be null");
+        }
+        return userRepository.findByName(name);*/
         return null;
     }
 
     @Override
     public boolean isUserHasRight(String userName, Right right) {
+        /*if(userName == null)
+            throw new IllegalArgumentException("name cannot be null");
+        if(right == null)
+            throw new IllegalArgumentException("Right cannot be null");
+        */
         return false;
     }
 }
diff --git a/src/test/java/fr/plil/sio/persistence/jpa/GroupServiceTest.java b/src/test/java/fr/plil/sio/persistence/jpa/GroupServiceTest.java
index 0b36a8e..402a5bd 100644
--- a/src/test/java/fr/plil/sio/persistence/jpa/GroupServiceTest.java
+++ b/src/test/java/fr/plil/sio/persistence/jpa/GroupServiceTest.java
@@ -1,6 +1,7 @@
 package fr.plil.sio.persistence.jpa;
 
 import fr.plil.sio.persistence.api.*;
+import javax.transaction.Transactional;
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -10,6 +11,7 @@ import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 
 import static org.junit.Assert.*;
 
+@Transactional
 @RunWith(SpringJUnit4ClassRunner.class)
 @SpringBootTest
 public class GroupServiceTest {
diff --git a/src/test/java/fr/plil/sio/persistence/jpa/RightServiceTest.java b/src/test/java/fr/plil/sio/persistence/jpa/RightServiceTest.java
index c214d9e..3068c09 100644
--- a/src/test/java/fr/plil/sio/persistence/jpa/RightServiceTest.java
+++ b/src/test/java/fr/plil/sio/persistence/jpa/RightServiceTest.java
@@ -2,6 +2,7 @@ package fr.plil.sio.persistence.jpa;
 
 import fr.plil.sio.persistence.api.Right;
 import fr.plil.sio.persistence.api.RightService;
+import javax.transaction.Transactional;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -10,6 +11,7 @@ import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 
 import static org.junit.Assert.*;
 
+@Transactional
 @RunWith(SpringJUnit4ClassRunner.class)
 @SpringBootTest
 public class RightServiceTest {
diff --git a/src/test/java/fr/plil/sio/persistence/jpa/UserServiceTest.java b/src/test/java/fr/plil/sio/persistence/jpa/UserServiceTest.java
index 55d79f8..7e1574e 100644
--- a/src/test/java/fr/plil/sio/persistence/jpa/UserServiceTest.java
+++ b/src/test/java/fr/plil/sio/persistence/jpa/UserServiceTest.java
@@ -1,6 +1,7 @@
 package fr.plil.sio.persistence.jpa;
 
 import fr.plil.sio.persistence.api.*;
+import javax.transaction.Transactional;
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -10,6 +11,7 @@ import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 
 import static org.junit.Assert.*;
 
+@Transactional
 @RunWith(SpringJUnit4ClassRunner.class)
 @SpringBootTest
 public class UserServiceTest {
--
libgit2 0.21.2