Hi there

Many thanks for your reply.

The code is quite involved and unique to our business objects. 

One thing I am not sure if it is causing an issue is that I instantiate a new instance of this same class (WhizzOppRenewer) from within the static method like so:

   // Create a new instance of this class with the target Opps
   WhizzOppRenewer wor = new WhizzOppRenewer(lstOpps);
    // start the batch execution
    Database.executeBatch(wor,10);


As I say, the class works fine when calling "WhizzOppRenewer.RenewOpps();" in Dev console execute anonymous window.



   The Batch relevant methods are below:
   
   global WhizzOppRenewer(List<Id> lstOppsIds){

        m_lstOppsIds = lstOppsIds;
                        
     System.Debug('In WhizzOppRenewer constructor');
     
    System.Debug('lstOppsIds.size()=' + lstOppsIds.size());

     for(Id id : lstOppsIds)
     {
       System.Debug('id=' + Id);
     }
     
     }
   
   // Start Method
  global List<Opportunity> start(Database.BatchableContext BC)
  {
     System.Debug('In WhizzOppRenewer start()');
     
    System.Debug('m_lstOppsIds.size()=' + m_lstOppsIds.size());

        m_lstOpps = [Select Id, Name, Account.Name from Opportunity where Id IN :m_lstOppsIds];

    System.Debug('m_lstOpps.size()=' + m_lstOpps.size());

     return m_lstOpps;
  }
   
   global void execute(Database.BatchableContext BC, list<Opportunity> lstOpps)
   {
    System.Debug('In WhizzOppRenewer.execute()...');

    System.Debug('lstOpps.size()=' + lstOpps.size());

    for(Opportunity opp : lstOpps)
    {
      System.Debug('Cloning Opp: ' + opp.id);

      catch(Exception e)
      {
        m_strErrors = m_strErrors + e.getMessage() + '\r\n';
        System.Debug(e.getMessage());
      }
    } 
    GlobalSetting.EnableOpportunitySetCancelledTrigger = true;
     
   }
   
   global void finish(Database.BatchableContext BC)
   {
     System.Debug('In WhizzOppRenewer finish()');

     // send me an email
     System.Debug('Beginning email...');
        Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
        
        mail.setToAddresses(new String[] {'bill.mclaughlin@whizzeducation.com'});
        mail.setSubject('Renewed Opps');
        
        String body = 'The following ' + m_lstConedOpps.size() + ' Opportunities were renewed:\n\n';
        
    for(Opportunity opp :m_lstConedOpps)
    {
            body += opp.id + '     ' + opp.Name + '     ' + opp.Account.Name + '     ' +  '\n\n';
        }
        
        if(m_strErrors.Length()==0)
        {
          m_strErrors = 'No errors';
        }

        body += '\r\n\r\nThe following errors were reported: ' + '\r\n' + m_strErrors;
        
        mail.setPlainTextBody(body);
    
        if(!Test.isRunningTest()) {
            Messaging.sendEmail(new Messaging.SingleEmailMessage[] { mail });                
        }

    GlobalSetting.EnableOpportunitySetCancelledTrigger = true;
        
    System.Debug('finished');
   
   }