Github user nirmal070125 commented on a diff in the pull request:

    https://github.com/apache/stratos/pull/371#discussion_r46102921
  
    --- Diff: 
components/org.apache.stratos.rest.endpoint/src/main/java/org/apache/stratos/rest/endpoint/api/StratosApiV41Utils.java
 ---
    @@ -1551,14 +1552,62 @@ private static void 
validateGroupAliasesInApplicationDefinition(ApplicationBean
                                 group.getAlias();
                         throw new RestAPIException(message);
                     }
    +
    +                // Validate top level group deployment policy with 
cartridges
    +                if (group.getCartridges() != null) {
    +                    if (group.getDeploymentPolicy() != null) {
    +                        groupParentHasDP = true;
    +                    }
    +                    
validateCartridgesForDeploymentPolicy(group.getCartridges(), groupParentHasDP);
    +                }
    +
                     groupsInApplicationDefinition.put(group.getAlias(), group);
     
                     if (group.getGroups() != null) {
                         //This is to validate the groups aliases recursively
    -                    
validateGroupsRecursively(groupsInApplicationDefinition, group.getGroups());
    +                    
validateGroupsRecursively(groupsInApplicationDefinition, group.getGroups(), 
groupParentHasDP);
                     }
                 }
             }
    +
    +        if ((applicationDefinition.getComponents().getCartridges() != 
null) &&
    +                
(!applicationDefinition.getComponents().getCartridges().isEmpty())) {
    +            
validateCartridgesForDeploymentPolicy(applicationDefinition.getComponents().getCartridges(),
 false);
    +        }
    +
    +    }
    +
    +    /**
    +     * This method validates cartridges in groups
    +     * Deployment policy should not defined in cartridge if group has a 
deployment policy
    +     * If group does not have a DP, then cartridge should have one
    +     * @param cartridgeReferenceBeans - Cartridges in a group
    +     * @throws RestAPIException
    +     */
    +    private static void 
validateCartridgesForDeploymentPolicy(List<CartridgeReferenceBean> 
cartridgeReferenceBeans,
    +                                                              boolean 
hasDP) throws RestAPIException {
    +
    +        if (hasDP) {
    +            for (CartridgeReferenceBean cartridge : 
cartridgeReferenceBeans) {
    +                if (cartridge.getSubscribableInfo().getDeploymentPolicy() 
!= null) {
    +                    String message = "Group deployment policy already 
exists. Remove deployment policy from " +
    +                            "cartridge subscription : [cartridge] " + 
cartridge.getSubscribableInfo().getAlias();
    +                    throw new RestAPIException(message);
    +                }
    +            }
    +        } else {
    +            for (CartridgeReferenceBean cartridge : 
cartridgeReferenceBeans) {
    +                if (cartridge.getSubscribableInfo().getDeploymentPolicy() 
== null) {
    --- End diff --
    
    What's the difference between hasDP and 
cartridge.getSubscribableInfo().getDeploymentPolicy() != null ? For me it seems 
like this logic can be simplified. 


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