unable to start the monitor on 4454 ，an other instance is problaly using the same port

 在打开idea studio后，再打开android studio，或者反过来，打开项目的时候就会报：unable to start the monitor on 4454 ，an other instance is problaly using the same port 这个错误。
 经过一番苦苦查找，原来是由于Log4JPlugin造成的，启用这个插件会打开本机的4454进行socket通讯。
 在log4Jplugin.jar中有一个LogServer类，代码如下：

package com.webspherious;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.ServerSocket;
import java.net.Socket;
import javax.net.ServerSocketFactory;

public class LogServer
{
  private static final int PORT_NUM = 4454;
  private static ServerSocket serverSocket;

  public static void main(String[] args)
  {
    serverSocket = createServerSocket();
    listenAndPrintLogMessages();
  }

  private static void listenAndPrintLogMessages()
  {
    for (;;)
    {
      Socket socket = null;
      try
      {
        System.out.println(" >> Server waiting for log messages...");
        socket = serverSocket.accept();

        InputStream is = socket.getInputStream();
        BufferedReader br = new BufferedReader(new InputStreamReader(is, "UTF-8"));
        String line = null;
        while ((line = br.readLine()) != null) {
          System.out.println(line);
        }
        if (socket != null) {
          try
          {
            socket.close();
          }
          catch (IOException ignored) {}
        }
      }
      catch (Exception e) {}finally
      {
        if (socket != null) {
          try
          {
            socket.close();
          }
          catch (IOException ignored) {}
        }
      }
    }
  }

  private static ServerSocket createServerSocket()
  {
    ServerSocketFactory serverSocketFactory = ServerSocketFactory.getDefault();
    try
    {
      serverSocket = serverSocketFactory.createServerSocket(4454);
    }
    catch (IOException ioEx)
    {
      System.err.println("Unable to create server");
      ioEx.printStackTrace();
      System.exit(-1);
    }
    return serverSocket;
  }
}

由此有以下解决办法：
1、禁用该插件。
2、一个默认，另外一个改成其他未被占用的端口，修改端口后，要修改与之相关的配置文件中的端口配置信息。