Failed to start end point associated with ProtocolHandler ["http-nio-8081"]

Failed to start end point associated with ProtocolHandler [“http-nio-8081”]

在运行springboot时出现了如上错误，

在将application.yml-server-porter的数值从8081修改成1025后
运行成功！
多次试验发现，8081/8787失败，改成其它任意port数值均可成功运行springboot，原因应该是端口被占用。