Nacos在双击startup.cmd启动时提示:Unable to start embedded Tomcat

r囧r小猫 2023-10-05 12:48 3阅读 0赞

## 场景 ##

Nacos简介、下载与配置持久化到Mysql：

[https://blog.csdn.net/BADAO\_LIUMANG\_QIZHI/article/details/109356152][https_blog.csdn.net_BADAO_LIUMANG_QIZHI_article_details_109356152]

在下载Nacos的zip包之后，双击bin下的startup.cmd之后提示:

org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
            at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:157)
            at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:540)
            at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142)
            at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775)
            at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
            at org.springframework.boot.SpringApplication.run(SpringApplication.java:316)
            at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260)
            at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248)
            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:498)
            at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:49)
            at org.springframework.boot.loader.Launcher.launch(Launcher.java:109)
            at org.springframework.boot.loader.Launcher.launch(Launcher.java:58)
            at org.springframework.boot.loader.PropertiesLauncher.main(PropertiesLauncher.java:466)
    Caused by: org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
            at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:125)
            at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(TomcatWebServer.java:86)
            at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:414)
            at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:174)
            at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:181)
            at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:154)
            ... 16 common frames omitted

报错图片如下

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70][]

博客：  
[https://blog.csdn.net/badao\_liumang\_qizhi][https_blog.csdn.net_badao_liumang_qizhi]  
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## 实现 ##

这是因为这里Nacos没有配置集群模式，而是使用的单机模式，所以编辑startup.cmd,

将MODE修改为standalone

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 1][]

默认MODE的值是"cluster"

所以在走下面的逻辑时会走集群模式的逻辑

if %MODE% == "standalone" (
        echo "nacos is starting with standalone"
       set"NACOS_OPTS=-Dnacos.standalone=true"
        set "NACOS_JVM_OPTS=-Xms512m -Xmx512m -Xmn256m"
    )
    
    rem if nacos startup mode is cluster
    if %MODE% == "cluster" (
        echo "nacos is starting with cluster"
       if %EMBEDDED_STORAGE% == "embedded" (
           set"NACOS_OPTS=-DembeddedStorage=true"
       )
    
        set "NACOS_JVM_OPTS=-server -Xms2g -Xmx2g -Xmn1g -XX:MetaspaceSize=128m -XX:MaxMetaspaceSize=320m -XX:-OmitStackTraceInFastThrow -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=%BASE_DIR%\logs\java_heapdump.hprof -XX:-UseLargePages"
    )

编辑之后，双击startup.cmd

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 2][]

[https_blog.csdn.net_BADAO_LIUMANG_QIZHI_article_details_109356152]: https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/109356152
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20201029115903175.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk=,size_16,color_FFFFFF,t_70
[https_blog.csdn.net_badao_liumang_qizhi]: https://blog.csdn.net/badao_liumang_qizhi
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20201029115910273.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk=,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20201029133323604.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk=,size_16,color_FFFFFF,t_70