code: private synchronized void createExecutor() {
          if (componentConfig == null) {
              // this is a completely normal occurrence and can happen if a ThreadFactory is bound prior to
              // component activation...  the proper thing to do is to do nothing and wait for activation
              return;
          }
  
          if (threadPoolController != null)
              threadPoolController.deactivate();
  
          ThreadPoolExecutor oldPool = threadPool;
  
          poolName = (String) componentConfig.get("name");
          String threadGroupName = poolName + " Thread Group";
  
          int coreThreads = Integer.parseInt(String.valueOf(componentConfig.get("coreThreads")));
          int maxThreads = Integer.parseInt(String.valueOf(componentConfig.get("maxThreads")));
  
          if (maxThreads <= 0) {
              maxThreads = Integer.MAX_VALUE;
          }
  
          if (coreThreads < 0) {
              coreThreads = 2 * CpuInfo.getAvailableProcessors();
          }
  
          // Make sure coreThreads is not bigger than maxThreads, subject to MINIMUM_POOL_SIZE limit
          coreThreads = Math.max(MINIMUM_POOL_SIZE, Math.min(coreThreads, maxThreads));
          // ... and then make sure maxThreads is not smaller than coreThreads ...
          maxThreads = Math.max(coreThreads, maxThreads);
  
          BlockingQueue<Runnable> workQueue = new BoundedBuffer<Runnable>(java.lang.Runnable.class, 1000, 1000);
  
          RejectedExecutionHandler rejectedExecutionHandler = new ExpandPolicy(workQueue, this);
  
          threadPool = new ThreadPoolExecutor(coreThreads, maxThreads, 0, TimeUnit.MILLISECONDS, workQueue, threadFactory != null ? threadFactory : new ThreadFactoryImpl(poolName, threadGroupName), rejectedExecutionHandler);
  
          threadPoolController = new ThreadPoolController(this, threadPool);
  
          if (oldPool != null) {
              softShutdown(oldPool);
          }
      }
docs: Create a thread pool executor with the configured attributes from this
  component config.