Github user Vishanth commented on a diff in the pull request:

    https://github.com/apache/stratos/pull/296#discussion_r29754947
  
    --- Diff: 
components/org.apache.stratos.rest.endpoint/src/main/java/org/apache/stratos/rest/endpoint/api/StratosApiV41.java
 ---
    @@ -453,6 +453,15 @@ public Response addServiceGroup(
                 if (e.getCause().getMessage().contains("already exists")) {
                     return 
Response.status(Response.Status.CONFLICT).entity(new StatusResponseBean(
                             Response.Status.CONFLICT.getStatusCode(), 
"Cartridge group not found")).build();
    +            } else if(e.getCause().getMessage().contains("duplicate 
cartridges")) {
    +                return 
Response.status(Response.Status.BAD_REQUEST).entity(new StatusResponseBean(
    +                        Response.Status.BAD_REQUEST.getStatusCode(), 
"Cartridges duplicated in the group definition")).build();
    +            } else if(e.getCause().getMessage().contains("duplicate 
groups")) {
    +                return 
Response.status(Response.Status.BAD_REQUEST).entity(new StatusResponseBean(
    +                        Response.Status.BAD_REQUEST.getStatusCode(), 
"Groups duplicated in the group definition")).build();
    +            } else if(e.getCause().getMessage().contains("cyclic group")) {
    +                return 
Response.status(Response.Status.BAD_REQUEST).entity(new StatusResponseBean(
    +                        Response.Status.BAD_REQUEST.getStatusCode(), 
"Cyclic group behaviour identified in the group definition")).build();
    --- End diff --
    
    True @swgkg. All of those exceptions are RestAPIExceptions and it is 
differentiated by its message, that is why get message is used to identify the 
status code.


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