diff --git a/.idea/misc.xml b/.idea/misc.xml
index 7e13a7a..5d9e04b 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,7 +4,7 @@
   <component name="JavaScriptSettings">
     <option name="languageLevel" value="ES6" />
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="false" project-jdk-name="12" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="false" project-jdk-name="1.8" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
 </project>
\ No newline at end of file
diff --git a/src/main/java/com/example/cosmos_serversb/resources/GroupsRest.java b/src/main/java/com/example/cosmos_serversb/resources/GroupsRest.java
index 50e399e..88b692d 100644
--- a/src/main/java/com/example/cosmos_serversb/resources/GroupsRest.java
+++ b/src/main/java/com/example/cosmos_serversb/resources/GroupsRest.java
@@ -1,8 +1,8 @@
 package com.example.cosmos_serversb.resources;
 
-import org.springframework.stereotype.Component;
-import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.springframework.stereotype.Component;
 
 import javax.ws.rs.*;
 
@@ -12,64 +12,88 @@
 
     @GET
     public String getGroups(String uId) throws JsonProcessingException{
-       return null;
+        ObjectMapper mapper = new ObjectMapper();
+        String json = mapper.writeValueAsString(null);
+        return json;
     }
 
     @POST
     public String createGroup(String name, String uId) throws JsonProcessingException{
-        return null;
+        ObjectMapper mapper = new ObjectMapper();
+        String json = mapper.writeValueAsString(null);
+        return json;
     }
 
 @Path("/{gId}")
     @GET
     public String getGroupInfo(String gId) throws JsonProcessingException{
-        return null;
+        ObjectMapper mapper = new ObjectMapper();
+        String json = mapper.writeValueAsString(null);
+        return json;
     }
 
     @DELETE
     public String deleteGroup(String gId) throws JsonProcessingException{
-        return null;
+        ObjectMapper mapper = new ObjectMapper();
+        String json = mapper.writeValueAsString(null);
+        return json;
     }
 
 @Path("/members")
     @GET
     public String getGroupMembersInfo(String gId) throws JsonProcessingException{
-        return null;
+        ObjectMapper mapper = new ObjectMapper();
+        String json = mapper.writeValueAsString(null);
+        return json;
     }
 
     @POST
     public String addGroupMembers(String gId, String uId) throws JsonProcessingException{
-        return null;
+        ObjectMapper mapper = new ObjectMapper();
+        String json = mapper.writeValueAsString(null);
+        return json;
     }
 
     @DELETE
     public String deleteGroupMembers(String gId, String uId) throws JsonProcessingException{
-        return null;
+        ObjectMapper mapper = new ObjectMapper();
+        String json = mapper.writeValueAsString(null);
+        return json;
     }
 
 @Path("/requests")
     @GET
     public String getGroupRequestsInfo(String gId) throws JsonProcessingException{
-        return null;
+        ObjectMapper mapper = new ObjectMapper();
+        String json = mapper.writeValueAsString(null);
+        return json;
     }
 
     @POST
     public String createGroupRequests(String gId, String uId, String product, String deadline, int location) throws JsonProcessingException{
-        return null;
+        ObjectMapper mapper = new ObjectMapper();
+        String json = mapper.writeValueAsString(null);
+        return json;
     }
 
 @Path("/{rId}")
     @GET
     public String getGroupRequestInfo(String gId, String rId) throws JsonProcessingException{
-        return null;
+        ObjectMapper mapper = new ObjectMapper();
+        String json = mapper.writeValueAsString(null);
+        return json;
     }
     @PUT
     public String changeGroupRequest(String gId, String rId, String uId, String product, String deadline, int location, boolean done) throws JsonProcessingException{
-        return null;
+        ObjectMapper mapper = new ObjectMapper();
+        String json = mapper.writeValueAsString(null);
+        return json;
     }
 
     @DELETE
     public String GroupsInfo(String gId, String rId) throws JsonProcessingException{
-        return null;
+        ObjectMapper mapper = new ObjectMapper();
+        String json = mapper.writeValueAsString(null);
+        return json;
     }
 }