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ABHISHEK SINGH 237ABHISHEK SINGH 237 

Getting Error:Not Serializable: com/salesforce/api/fast/List$$lcom/salesforce/api/Messaging/SingleEmailMessage$$r

Below are the code of both queueable apex and batch class.
public class sendEmailsExtended implements Queueable{
    
    private static List<Email_Log__c> emailDebugLogs = new List<Email_Log__c>();
    map<String,TimeEmailRules__c> allRules;
    private Boolean sendEmails = true;
    
    public sendEmailsExtended(map<String,TimeEmailRules__c> query){
        allRules=query;
    }
    public void execute(QueueableContext qc){
        Messaging.SingleEmailMessage mail1 = new Messaging.SingleEmailMessage();
        mail1.toAddresses=new List<String>{'abhishek.singh@yopmail.com','bkevat@yopmail.com','varun.singh@yopmail.com'};
        mail1.optOutPolicy='FILTER';
        mail1.subject='Subject Test Message';
        mail1.plainTextBody='This is the message body.';
        //Messaging.SingleEmailMessage mail2 = new Messaging.SingleEmailMessage(toAddresses='abc1@gmail.com',optOutPolicy='FILTER',subject='Subject Test Message',plainTextBody='This is the message body.');
        //Messaging.SingleEmailMessage mail3 = new Messaging.SingleEmailMessage(toAddresses='abc1@gmail.com',optOutPolicy='FILTER',subject='Subject Test Message',plainTextBody='This is the message body.');
            
        sendEmailsBatchExtended batch = new sendEmailsBatchExtended(new List<Messaging.SingleEmailMessage>{mail1});
        Id batchjobId =Database.executebatch(batch,1);
}
}

Batch class Code
global class sendEmailsBatchExtended implements Database.Batchable<sObject>,Database.Stateful{
    List<Messaging.SingleEmailMessage> mailtosend;
    String query;
    public sendEmailsBatchExtended(List<Messaging.SingleEmailMessage> maillist){
    mailtosend = maillist;   
    }
    global Iterable<sObject> start(Database.BatchableContext bc){
        return Database.getQueryLocator(query);
    }
    global void execute(Database.BatchableContext bc,List<sObject> scope){
    System.debug('value in mailtosend'+mailtosend);
    }
    global void finish(Database.BatchableContext bc){
    }
}
NagendraNagendra (Salesforce Developers) 
Hi Abhishek,

The message indicates that the pattern you are using won't work because of this line: 
List<Messaging.SingleEmailMessage> mailtosend;
with the Database.Stateful marker that tells the platform to use serialization and deserialization to hold on to the information between execute calls. For reasons I don't know, by design, Messaging.SingleEmailMessage is not serializable, hence the error message.

Instead, build the messages inside the execute method and if the overall logic is driven by a query, best to invoke that in the start method and return a QueryLocator.

Thanks,
Nagendra
ManjusrinuManjusrinu

Hi just Declare the List<Messaging.SingleEmailMessage> mail in global and create the instance of it in the execute method . It will work . 

Use the below code for reference .

public class SendBirthdayWishesBatch implements  Database.Batchable <SObject>,Database.Stateful {
    public  EmailTemplate eTemplate ;
    public  List<String> FinalEmails = new List<String>();
    public List<Messaging.SingleEmailMessage> mail ;
    public void execute(SchedulableContext scheduleContext){
        Database.executeBatch(this);
    }
    public Database.Querylocator start (Database.BatchableContext BC) {  
        return Database.getQueryLocator(
            [SELECT Name,ownerId,BirthdateForReminder__c,Active_Team_Member__c,Blumark_Email_Address__c FROM 
             Blumark_Team_Member__c where 
             Blumark_Email_Address__c != null AND 
             Active_Team_Member__c = true AND 
             BirthdateForReminder__c =: system.today()
            ]);
    }
    public void execute(Database.BatchableContext BC, List<Blumark_Team_Member__c> sendwishes){ 
        Messaging.SingleEmailMessage email = new Messaging.SingleEmailMessage();
        Try {
        User loggedInUser = [SELECt Email from User where Id =: userInfo.getUserId()];
        eTemplate = [SELECT Id,subject,body FROM EmailTemplate where DeveloperName = 'Birthday_Email_Template'];
        List<Blumark_Team_Member__c> bluMarklist = [SELECT Active_Team_Member__c,Blumark_Email_Address__c from Blumark_Team_Member__c
                                                    where Active_Team_Member__c = true AND Blumark_Email_Address__c != null AND Blumark_Email_Address__c !=: loggedInUser.Email  ];
        
        List<Blumark_Team_Member__c> todayMembersBirthday = [SELECT Blumark_Email_Address__c,BirthdateForReminder__c
                                                             from Blumark_Team_Member__c WHERE BirthdateForReminder__c =: system.today()];
        for(Blumark_Team_Member__c allEmails : bluMarklist) {
            for(Blumark_Team_Member__c TodayBirthdayEmail : todayMembersBirthday) {
                if(allEmails.Blumark_Email_Address__c != TodayBirthdayEmail.Blumark_Email_Address__c) {
                    FinalEmails.add(allEmails.Blumark_Email_Address__c);
                    
                }
            }
        }        
        eTemplate = [SELECT Id,subject,body FROM EmailTemplate where DeveloperName = 'Birthday_Email_Template'];
        email.setHtmlBody(eTemplate.body);
        email.setSubject('BirthDay Wishes');
        email.setToaddresses(FinalEmails);
        Messaging.sendEmail(new Messaging.SingleEmailMessage[] {email});
        
    }
        Catch(Exception e) {
            System.debug('Exception' +e.getmessage());
        }
    }
    public void finish(Database.BatchableContext bc) {
       mail = new List<Messaging.SingleEmailMessage>();
       Messaging.sendEmail(mail);
        
    }
}

Make this as best answer