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Below is my code

<apex:page standardController="Order" extensions="selectProduct" docType="html-5.0" >

   <apex:form >    

        <apex:pageBlock >        

            <apex:pageMessages ></apex:pageMessages>

                <apex:pageBlockButtons >

                

         <!--   <apex:commandButton value="Save" action="{!Save}"/> -->

                

                <apex:commandButton value="Save" action="{!Submit}"/>

                <apex:commandButton value="Cancel" action="{!Cancel}"/>

                

                </apex:pageBlockButtons>   

         

         <apex:pageblockSection >

         

             <apex:pageBlockTable value="{!selectP}" var="q">

             

                 <apex:column value="{!q.Name} " HeaderValue="Product"/>

                 

                 <apex:column value="{!q.UnitPrice} " HeaderValue="Unit Price(USD)"/>

                  <apex:pageMessages ></apex:pageMessages>

                 <apex:column headerValue="Quantity">

                     

                         <apex:inputText value="{!q.Order_Quantity__c}"/>

                         

                 </apex:column>

             </apex:pageBlockTable>

 

         </apex:pageblockSection>

         

        </apex:pageBlock>    

    </apex:form>

</apex:page>

public class selectProduct{

String OrderSelect = ApexPages.currentPage().getParameters().get('param2');

public List<PricebookEntry> selectP{get;set;}

public selectProduct(ApexPages.StandardController stdController) {

       

       String OrderId= ApexPages.currentPage().getParameters().get('param1');

       String selectedString = string.valueOf(OrderId);             

       selectedString = string.valueOf(selectedString.substring(1,selectedString.length() - 1));     

       selectedString = selectedString.replace(' ',''); 

       String[] strList = selectedString.split(','); 

       selectP = new  List<PricebookEntry>();       

       selectP = [SELECT Id,Name,UnitPrice,Order_Quantity__c FROM PricebookEntry WHERE Id In :strList  AND CurrencyIsoCode='USD'];

       

    }   

    

     public pageReference Cancel(){

     

      PageReference h = new PageReference('/'+OrderSelect);

      h.setRedirect(true);

      return h;

     

     

     }

    

  //--------------  

  

  

      public pageReference Submit(){

        for(PricebookEntry e:selectP){

           if(e.Order_Quantity__c==null || e.Order_Quantity__c==0 || e.Order_Quantity__c<0.0){

           

               ApexPages.addmessage(new ApexPages.message(ApexPages.severity.WARNING,'Please enter a positive Value.'));

               return null;

           

           } 

           

           }  

           

 

    for(PricebookEntry r:selectP){

    

     system.debug('*************************OrderSelect************************'+OrderSelect);

   

     Orderitem t = new OrderItem();

     t.OrderId = OrderSelect;

     t.UnitPrice = r.UnitPrice;

     t.PricebookEntryId = r.Id;

     t.Quantity = r.Order_Quantity__c;

  

    

     }

     

    PageReference d = new PageReference('/'+OrderSelect);

    d.setRedirect(true);

    return d;

    

    }

}

Not able to get why this error is coming.Please help its urgent
1 answer
  1. Jun 23, 2016, 3:13 AM

    Can you please tell in which method the following code is :-

    for(PricebookEntry r:selectP){

    system.debug('*************************OrderSelect************************'+OrderSelect);

    Orderitem t = new OrderItem();

    t.OrderId = OrderSelect;

    t.UnitPrice = r.UnitPrice;

    t.PricebookEntryId = r.Id;

    t.Quantity = r.Order_Quantity__c;

    }

    PageReference d = new PageReference('/'+OrderSelect);

    d.setRedirect(true);

    return d;

     
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