关于Process的waitFor死锁问题及解决方案

public static String cmd(String cmd) throws InterruptedException  {
        try {
                // 使用Runtime来执行command，生成Process对象
                Process process = Runtime.getRuntime().exec(
                        new String[] { "/bin/sh", "-c", cmd });
                int exitCode = process.waitFor();
                // 取得命令结果的输出流
                InputStream is = process.getInputStream();
                // 用一个读输出流类去读
                InputStreamReader isr = new InputStreamReader(is);
                // 用缓冲器读行
                BufferedReader br = new BufferedReader(isr);
                String line = null;
                StringBuilder sb = new StringBuilder();
                while ((line = br.readLine()) != null) {
                    sb.append(line);
                }
                is.close();
                isr.close();
                br.close();
                
                return sb.toString();
            } catch (java.lang.NullPointerException e) {
            	
            	throw new BaseException(e);
            } catch (java.io.IOException e) {
            	throw new BaseException(e);
            }
            return null;
    }

public static String callCmd(String cmd) throws InterruptedException  {
         Process process = null;
         BufferedReader nORMalReader = null;
         BufferedReader errorReader = null;
         try {          
                process = Runtime.getRuntime().exec(
                        new String[] { "/bin/sh", "-c", cmd });
                
                normalReader = new BufferedReader(new InputStreamReader(process.getInputStream()));
                errorReader = new  BufferedReader(new  InputStreamReader(process.getErrorStream()));
                String line = null;
                StringBuilder sb = new StringBuilder();
                while ((line = normalReader.readLine()) != null) {
                    sb.append(line);
                }
                String errorLine;
                while ((errorLine = errorReader.readLine()) != null) {
                    logger.warn("脚本文件执行信息ErrorStream:{}", errorLine);
                }
                // 等待程序执行结束并输出状态
                int exitCode = process.waitFor();
                if (0 == exitCode) {
                    logger.info("脚本文件执行成功!");
                } else {
                    logger.error("脚本文件执行失败:{}",cmd);
                    throw new BaseException("脚本文件执行失败:"+cmd);
                }
                return sb.toString();
          } catch (java.lang.NullPointerException e) {
                throw new BaseException(e);
          } catch (java.io.IOException e) {
                throw new BaseException(e);
          }finally{
                if (null != normalReader) {
                    try {
                        normalReader.close();
                    } catch (IOException e) {
                        logger.error("流文件关闭异常：", e);
                    }
                }
                if (null != errorReader) {
                    try {
                        errorReader.close();
                    } catch (IOException e) {
                        logger.error("流文件关闭异常：", e);
                    }
                }
                if (null != process) {
                    process.destroy();
                }
         }
    }

public class DeadLockTest
{
    private static Object A = new Object(), B = new Object();
    public static void main(String[] args)
    {
        new Thread(() -> {
            System.out.println("线程1开始执行...");
            synchronized (A)
            {
                try
                {
                    System.out.println("线程1拿到A锁");
                    //休眠两秒让线程2有时间拿到B锁
                    Thread.sleep(2000);
                } catch (Exception e)
                {
                    e.printStackTrace();
                }
                synchronized (B)
                {
                    System.out.println("线程1拿到B锁");
                }
            }
        }).start();
        new Thread(() -> {
            System.out.println("线程2开始执行...");
            synchronized (B)
            {
                try
                {
                    System.out.println("线程2拿到B锁");
                    //休眠两秒让线程1有时间拿到A锁
                    Thread.sleep(2000);
                } catch (Exception e)
                {
                    e.printStackTrace();
                }
                synchronized (A)
                {
                    System.out.println("线程2拿到A锁");
                }
            }
        }).start();
    }
}