java.lang.Exception: Port 8083 already in use.

报这种错的原因，除了网上说的那些端口占用之类的解决办法之外呢，还会因为系统host文件出错，如果动了这个文件，把它还原了就好，我贴出我的文件当例子：

# Copyright (c) 1993-2009 Microsoft Corp.## This is a sample HOSTS file used by Microsoft TCP/IP for Windows.## This file contains the mappings of IP addresses to host names. Each# entry should be kept on an individual line. The IP address should# be placed in the first column followed by the corresponding host name.# The IP address and the host name should be separated by at least one# space.## Additionally, comments (such as these) may be inserted on individual# lines or following the machine name denoted by a '#' symbol.## For example:##      102.54.94.97     rhino.acme.com          # source server#       38.25.63.10     x.acme.com              # x client host# localhost name resolution is handled within DNS itself.#127.0.0.1       localhost#::1             localhost