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

    https://github.com/apache/stratos/pull/354#discussion_r30730518
  
    --- Diff: 
components/org.apache.stratos.autoscaler/src/main/java/org/apache/stratos/autoscaler/util/AutoscalerUtil.java
 ---
    @@ -773,19 +773,34 @@ public void updateApplicationsTopology(Application 
application)
             for (Group existingGroup : existingGroups) {
                 Group newGroup = 
application.getGroupRecursively(existingGroup.getUniqueIdentifier());
                 if (newGroup != null) {
    -                //Finding the GroupMonitor based on ApplicationMonitor
    -                GroupMonitor groupMonitor = (GroupMonitor) 
AutoscalerContext.getInstance().
    -                        getAppMonitor(application.getUniqueIdentifier()).
    -                        
findGroupMonitorWithId(existingGroup.getUniqueIdentifier());
    -                //Updating the GroupMonitor
    -                for (NetworkPartitionContext networkPartitionContext : 
groupMonitor.
    -                        getNetworkPartitionContextsMap().values()) {
    -                    ((ParentLevelNetworkPartitionContext) 
networkPartitionContext).
    -                            
setMinInstanceCount(newGroup.getGroupMinInstances());
    -                    ((ParentLevelNetworkPartitionContext) 
networkPartitionContext).
    -                            
setMaxInstanceCount(newGroup.getGroupMaxInstances());
    +
    +                ApplicationMonitor applicationMonitor = 
AutoscalerContext.getInstance().
    +                        getAppMonitor(application.getUniqueIdentifier());
    +
    +                if (applicationMonitor != null) {
    +                    //Finding the GroupMonitor based on ApplicationMonitor
    +                    GroupMonitor groupMonitor = (GroupMonitor) 
applicationMonitor.
    +                            
findGroupMonitorWithId(existingGroup.getUniqueIdentifier());
    +
    +                    if (groupMonitor != null) {
    +                        //Updating the GroupMonitor
    +                        for (NetworkPartitionContext 
networkPartitionContext : groupMonitor.
    +                                getNetworkPartitionContextsMap().values()) 
{
    +                            ((ParentLevelNetworkPartitionContext) 
networkPartitionContext).
    +                                    
setMinInstanceCount(newGroup.getGroupMinInstances());
    +                            ((ParentLevelNetworkPartitionContext) 
networkPartitionContext).
    +                                    
setMaxInstanceCount(newGroup.getGroupMaxInstances());
    +                        }
    +                    }
                     }
     
    +
    --- End diff --
    
    Please remove the commented code.


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