Simple thread pool with rejected execution - log4j required

ThreadPool.java

/*
 * Copyright 2015 Tarık Yılmaz
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.example;

import org.apache.log4j.Logger;

import java.util.concurrent.*;

public class ThreadPool
{
    private static final Logger logger = Logger.getLogger(ThreadPool.class);

    private ThreadPoolExecutor executor;

    private int threadSize;

    private int queueSize;

    public void setThreadSize(int threadSize) {
        this.threadSize = threadSize;
    }

    public void setQueueSize(int queueSize) {
        this.queueSize = queueSize;
    }

    public void createThreadPool() {
        if (threadSize == 0) {
            threadSize = Runtime.getRuntime().availableProcessors();
        }
        
        if (queueSize == 0) queueSize = 200;
        
        final BlockingQueue<Runnable> queue = new ArrayBlockingQueue<>(queueSize);

        executor = new ThreadPoolExecutor(threadSize, threadSize, 1L, TimeUnit.HOURS, queue);
        executor.setRejectedExecutionHandler(new RejectedExecutionHandler()
        {
            public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
                try {
                    Thread.sleep(2000);
                    queue.put(r);
                } catch (InterruptedException e) {
                    logger.error(e.getMessage(), e);
                }
            }
        });
    }

    public int getActiveThread() {
        return executor.getQueue().size();
    }

    public void execute(Runnable r) {
        executor.execute(r);
    }

    public <T> T submit(Runnable runnable, T type) {
        try {
            Future<T> future = executor.submit(runnable, type);
            return future.get();
        } catch (ExecutionException | InterruptedException e) {
            logger.error(e.getMessage(), e);
        }
        return null;
    }

    public void stop() {
        executor.shutdown();
    }
}