Question

I am using ThreadPoolExecutor utility and passing the values thru constructor in called class. The constructor takes two arguments (1) a map (2) a string.

I am confused on how to declare a bean for the called class which takes two arguments( a map and a string). My code is as below.

***Calling Class***

    public class Starter {

        ProcessScheduler deleteBatch;
        public ProcessScheduler getDeleteBatch() {
            return deleteBatch;
            }

        public void setDeleteBatch(ProcessScheduler deleteBatch) {
            this.deleteBatch = deleteBatch;
            }


        public void start() {

        ThreadPoolExecutor executor = testThreadPoolExecutorService.createNewThreadPool();


            for (int i=0;i<=5;i++)
            {
            Map m4 = arrayRecords.get(i);
            executor.execute(new ProcessScheduler("Thread #"+i,m4));                     // Comment - started 
The above line executes fine but it gives null pointer error if I will call any other method from the run() inside  called class(ProcessScheduler). So I have use a Bean such as executor.execute(getDeleteBatch("Thread #"+i,m4)) to get the instance of the bean. But I dont know how to do this in this case?

// Comment - ended


            }

***Called Class***



public class ProcessScheduler implements Runnable {

         public ProcessScheduler(String taskName, Map m) {
            this.taskName = taskName;
            this.deleteRecordsMap = (HashMap) m;
            }
        Processor processor;
        public Processor getProcessor() 
        {
            return processor;
        }


        public void setProcessor(Processor mappProcessor) {
            this.mappProcessor = mappProcessor;
        }


        public void run() 
        {
        // This returns null 
        processor.getNumbers();
        }

        }



I have some confusions as below.
(1) How to declare a bean for ProcessScheduler in this case. 
(2) Is the declaration of getDeleteBatch is correct in this case like below?

public ProcessScheduler getDeleteBatch() {
            return deleteBatch;
            }

Thanks
Gendaful

Answer 1

I have solved this issue as below,

From my calling class, I am passing the instance of Processor class in the execute method.

executor.execute
(newProcessScheduler("Thread#"+Thread.currentThread().getName(),hm,processor))

So, what it does is, since I am passing the processor as an argument in the execute(), it will not throw nullpointerexception if I call a method of processor inside run() of ProcessScheduler class.