I have 2 users both have admin licience,,,Now Those account Whose indust is not null there Owner is User2.
As per my batch class At the end User should get some mail,I am not getting any email.

When i check Job its shown as completed.
BELOW CODE(JUST COPY AND PASTE AND CHECK):


global class Batch_Apex_Example_2 implements Database.Batchable<sobject>,Database.Stateful{
    public Map<Id,List<String>> accMap;
    global Batch_Apex_Example_2(){
        accMap=new Map<Id,List<String>>();
    }
    global Database.QueryLocator start(Database.BatchableContext bc){
        String query='Select id,name,ownerId from Account';
        return Database.getQueryLocator(query);   
    }
    
    global void execute(Database.BatchableContext bc,List<Account> scope){
        for(Account a:scope){
            if(accMap.containsKey(a.ownerId)){
                List<String> names=accMap.get(a.ownerId);
                names.add(a.name);
                accMap.put(a.ownerId,names);
            }else{
                List<String> names=new List<String>();
                names.add(a.name);
                accMap.put(a.ownerId,names);
            }
        }   
    }
    global void finish(Database.BatchableContext bc){
        Set<Id> keys=accMap.keySet();
        List<User> users=[Select id,email from user where id in:keys];
        Map<Id,String> userMap=new Map<Id,String>();
        for(User u:users){
            userMap.put(u.id,u.email);
        }
        System.debug('userMap===========>'+userMap);
        List<Messaging.Email> emails=new List<Messaging.Email>();
        for(Id k:keys){
            Messaging.SingleEmailMessage msg=new Messaging.SingleEmailMessage();
            List<String> accounts=accMap.get(k);
            String body='';
            for(String a:accounts){
                body=body+'<br/>'+a;
            }
            msg.setSubject('Your Accounts');
            msg.setHtmlBody(body);
            String email=userMap.get(k);
            String[] toadd=new String[]{email};
                msg.setToAddresses(toadd);
            emails.add(msg);
        }
        Messaging.sendEmail(emails);
    }
}


/*FOR EXECUTING BATCH CLASS
1)cltr+E
2)Batch_Apex_Example_2 be=new Batch_Apex_Example_2();
Id jobId=Database.executeBatch(be,5);
3)Execute
*/