Hi Expert,

Have to update the field 'actual hours' of "project Portfolio" object through all the roll up of the 'actual hours' of "project" object. 

iam getting an error- System.NullPointerException: Attempt to de-reference a null object: Class.updatedActualHours.processAfterUpdateActualHours: line 61, column 1

here is the code-

public class updatedActualHours 

{
  public static List<CloudbyzITPM__Project__c> affectedActualHours = new List<CloudbyzITPM__Project__c>();
    public static List<CloudbyzITPM__Project__c> oldaffectedActualHours = new List<CloudbyzITPM__Project__c>();
  public static set<ID> affc = new set<ID>();
    public static set<ID> affcold = new set<ID>();
  public static void processAfterUpdateActualHours()
 {
     affectedActualHours = (List<CloudbyzITPM__Project__c>)Trigger.New;
     oldaffectedActualHours = (List<CloudbyzITPM__Project__c>)Trigger.Old;
     if(Trigger.isDelete){
        for(CloudbyzITPM__Project__c  affc1 : oldaffectedActualHours)
     {
         if(affc1.CloudbyzITPM__Project_Portfolio__c != null)
         {
         system.debug('value of affc1'+ affc1);
        affc.add(affc1.CloudbyzITPM__Project_Portfolio__c);
     }
     }
      system.debug('this is the value'+ affc);
    CloudbyzITPM__Project_Portfolio__c fn = [select id,name,CloudbyzITPM__Actual_Hours__c from CloudbyzITPM__Project_Portfolio__c where id in: affc limit 1];
    list<CloudbyzITPM__Project__c> affectedActualHours1 = [select id, name,CloudbyzITPM__Actual_Hours__c, CloudbyzITPM__Project_Portfolio__c from CloudByzITPM__Project__c where CloudbyzITPM__Project_Portfolio__c = :fn.id];
          
      Decimal j=0;
     System.debug('@@affectedActualHours1@@'+affectedActualHours1+'@@affectedActualHours1.size'+affectedActualHours1.size());  
    if(affectedActualHours1.size()>0)
       {
           for(CloudbyzITPM__Project__C afc1 : affectedActualHours1)
        {
            System.debug('@@afc1.CloudbyzITPM__Actual_Hours__c@@'+afc1.CloudbyzITPM__Actual_Hours__c);
          if(afc1.CloudbyzITPM__Actual_Hours__c !=0 && afc1.CloudbyzITPM__Actual_Hours__c!=null)
            j = j + afc1.CloudbyzITPM__Actual_Hours__c;
        }
    }
    
 if(j>0)
 {
     System.debug('@@pBUFinal@@');
    fn.CloudbyzITPM__Actual_Hours__c = j;
    }
          else{
              fn.CloudbyzITPM__Actual_Hours__c = 0;
          }
     update fn; 
      System.debug('@@fn4@@'+fn);
    }
    else{
     if(affectedActualHours.size()>0)
     {/*
     for(CloudbyzITPM__Project__c  affc1 : affectedActualHours)
     {
         if(affc1.CloudbyzITPM__Project_Portfolio__c != null)
         {
         system.debug('value of affc1'+ affc1);
        affc.add(affc1.CloudbyzITPM__Project_Portfolio__c);
     }
     }*/
         system.debug('@@@value of affc1'+ affectedActualHours);
         for(integer i = 0; i<affectedActualHours.size(); ++i){
         if(affectedActualHours[i].CloudbyzITPM__Project_Portfolio__c != null && oldaffectedActualHours[i]!= null && oldaffectedActualHours[i].CloudbyzITPM__Project_Portfolio__c != null && oldaffectedActualHours[i].CloudbyzITPM__Project_Portfolio__c != affectedActualHours[i].CloudbyzITPM__Project_Portfolio__c)
         {
         system.debug('value of affc1'+ affectedActualHours[i]);
        affc.add(affectedActualHours[i].CloudbyzITPM__Project_Portfolio__c);
             affcold.add(oldaffectedActualHours[i].CloudbyzITPM__Project_Portfolio__c);
         }
             if(affectedActualHours[i].CloudbyzITPM__Project_Portfolio__c != null)
         {
         system.debug('value of affc1'+ affectedActualHours[i]);
        affc.add(affectedActualHours[i].CloudbyzITPM__Project_Portfolio__c);
         } 
             else if(affectedActualHours[i].CloudbyzITPM__Project_Portfolio__c != null && oldaffectedActualHours[i]!= null && oldaffectedActualHours[i].CloudbyzITPM__Project_Portfolio__c != null){
                affc.add(oldaffectedActualHours[i].CloudbyzITPM__Project_Portfolio__c); 
             }
             
         }
          if(affcold.size()>0)
      {
     system.debug('this is the value'+ affc);
    CloudbyzITPM__Project_Portfolio__c fn = [select id,name,CloudbyzITPM__Actual_Hours__c from CloudbyzITPM__Project_Portfolio__c where id in: affcold limit 1];
    list<CloudbyzITPM__Project__c> affectedActualHours1 = [select id, name,CloudbyzITPM__Actual_Hours__c, CloudbyzITPM__Project_Portfolio__c from CloudByzITPM__Project__c where CloudbyzITPM__Project_Portfolio__c = :fn.id];
      
      Decimal j=0;
     System.debug('@@affectedActualHours1@@'+affectedActualHours1+'@@affectedActualHours1.size'+affectedActualHours1.size());  
    if(affectedActualHours1.size()>0)
       {
           for(CloudbyzITPM__Project__C afc1 : affectedActualHours1)
        {
            System.debug('@@afc1.CloudbyzITPM__Actual_Hours__c@@'+afc1.CloudbyzITPM__Actual_Hours__c);
          if(afc1.CloudbyzITPM__Actual_Hours__c !=0 && afc1.CloudbyzITPM__Actual_Hours__c!=null)
            j = j + afc1.CloudbyzITPM__Actual_Hours__c;
        }
    }
    
 if(j>0)
 {
     System.debug('@@pBUFinal@@');
    fn.CloudbyzITPM__Actual_Hours__c = j;
    }
          else{
              fn.CloudbyzITPM__Actual_Hours__c = 0;
          }
     update fn; 
      System.debug('@@fn4@@'+fn);
    }
      if(affc.size()>0)
      {
     system.debug('this is the value'+ affc);
    CloudbyzITPM__Project_Portfolio__c fn = [select id,name,CloudbyzITPM__Actual_Hours__c from CloudbyzITPM__Project_Portfolio__c where id in: affc limit 1];
    list<CloudbyzITPM__Project__c> affectedActualHours1 = [select id, name,CloudbyzITPM__Actual_Hours__c, CloudbyzITPM__Project_Portfolio__c from CloudByzITPM__Project__c where CloudbyzITPM__Project_Portfolio__c = :fn.id];
      
      Decimal j=0;
     System.debug('@@affectedActualHours1@@'+affectedActualHours1+'@@affectedActualHours1.size'+affectedActualHours1.size());  
    if(affectedActualHours1.size()>0)
       {
           for(CloudbyzITPM__Project__C afc1 : affectedActualHours1)
        {
            System.debug('@@afc1.CloudbyzITPM__Actual_Hours__c@@'+afc1.CloudbyzITPM__Actual_Hours__c);
          if(afc1.CloudbyzITPM__Actual_Hours__c !=0 && afc1.CloudbyzITPM__Actual_Hours__c!=null)
            j = j + afc1.CloudbyzITPM__Actual_Hours__c;
        }
    }
    
 if(j>0)
 {
     System.debug('@@pBUFinal@@');
    fn.CloudbyzITPM__Actual_Hours__c = j;
    }
          else{
              fn.CloudbyzITPM__Actual_Hours__c = 0;
          }
     update fn; 
      System.debug('@@fn4@@'+fn);
    }
    }
    }
}
}