本文主要是介绍Nacos 启动报错 Unable to start web server……Unable to start embedded Tomcat，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
报错内容如下
org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcatat org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:156)at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:544)at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141)at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:744)at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:391)at org.springframework.boot.SpringApplication.run(SpringApplication.java:312)at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215)at org.springframework.boot.SpringApplication.run(SpringApplication.java:1204)at com.alibaba.nacos.Nacos.main(Nacos.java:35)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:483)at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:49)at org.springframework.boot.loader.Launcher.launch(Launcher.java:108)at org.springframework.boot.loader.Launcher.launch(Launcher.java:58)at org.springframework.boot.loader.PropertiesLauncher.main(PropertiesLauncher.java:467)
Caused by: org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcatat org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:124)at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(TomcatWebServer.java:86)at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:416)at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:180)at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:180)at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:153)... 16 common frames omitted
（spring cloud alibaba from fhadmin.cn）因为如果直接在bin目录下用鼠标双击startup.cmd启动的话，默认的是以cluster(集群)的方式启动，直接启动第一个会报Unable to start embedded Tomcat错误，改成单机启动：
用记事本打开bin目录下查看startup.cmd
@echo off
rem Copyright 1999-2018 Alibaba Group Holding Ltd.
rem Licensed under the Apache License, Version 2.0 (the "License");
rem you may not use this file except in compliance with the License.
rem You may obtain a copy of the License at
rem
rem http://www.apache.org/licenses/LICENSE-2.0
rem
rem Unless required by applicable law or agreed to in writing, software
rem distributed under the License is distributed on an "AS IS" BASIS,
rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
rem See the License for the specific language governing permissions and
rem limitations under the License.
if not exist "%JAVA_HOME%\bin\java.exe" echo Please set the JAVA_HOME variable in your environment, We need java(x64)! jdk8 or later is better! & EXIT /B 1
set "JAVA=%JAVA_HOME%\bin\java.exe"setlocal enabledelayedexpansionset BASE_DIR=%~dp0
rem added double quotation marks to avoid the issue caused by the folder names containing spaces.
rem removed the last 5 chars(which means \bin\) to get the base DIR.
set BASE_DIR="%BASE_DIR:~0,-5%"set CUSTOM_SEARCH_LOCATIONS=file:%BASE_DIR%/conf/set MODE="standalone"
set FUNCTION_MODE="all"
set SERVER=nacos-server
set MODE_INDEX=-1
set FUNCTION_MODE_INDEX=-1
set SERVER_INDEX=-1
set EMBEDDED_STORAGE_INDEX=-1
set EMBEDDED_STORAGE=""把 set MODE="cluster" 改为 set MODE="standalone" 即可
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