我建议您对代码进行以下更改。答。将执行服务创建和关闭移出if块。
b。不要将线程池大小设置为5以上，因为您只有一个核心，

public void processActivityDeposits(
    Activity activity) {
  int partitionSize =
      environment.getProperty("patition.size", Integer.class, 1000);
  List<Long> records =
      service.findReadyToProcessRecords(
          activity.getActivityId(),
          partitionSize);
        //moved out of if block
       int threadPoolSize =
          environment.getProperty("thread.pool.size", Integer.class, 10);
      ExecutorService executorService = Executors.newFixedThreadPool(threadPoolSize);     
  if (records != null && records.size() > 0) {
    try {

      for (Long activityId : records) {
        executorService.execute(
            new ActivityDepositInternalProcessor(
                activityId));
      }

      processActivityDeposits(
          activity);
    } catch (Exception exception) {
      exception.printStackTrace();
    }
  }
  //moved out of if block
   executorService.shutdown();
      try {
        executorService.awaitTermination(Long.MAX_VALUE, TimeUnit.MILLISECONDS);
      } catch (InterruptedException e) {
        e.printStackTrace();
      }
}