ContextPath must start with '' and not end with ''
1、问题
运行Spring Boot项目，发生java.lang.IllegalArgumentException异常，原因如下：
ContextPath must start with '/' and not end with '/'
完整的Run输出如下：
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.5.2)
2021-10-08 21:35:25.043 INFO 2444 --- [ main] com.company.bolejob.BolejobApplication : Starting BolejobApplication using Java 1.8.0_301 on GOLDENUNION with PID 2444 (E:\Projects-Idea\ProjectBootBoleJob\target\classes started by liuzh in E:\Projects-Idea\ProjectBootBoleJob)
2021-10-08 21:35:25.048 INFO 2444 --- [ main] com.company.bolejob.BolejobApplication : No active profile set, falling back to default profiles: default
2021-10-08 21:35:26.198 WARN 2444 --- [ main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'tomcatServletWebServerFactory' defined in class path resource [org/springframework/boot/autoconfigure/web/servlet/ServletWebServerFactoryConfiguration$EmbeddedTomcat.class]: Initialization of bean failed; nested exception is java.lang.IllegalArgumentException: ContextPath must start with '/' and not end with '/'
2021-10-08 21:35:26.205 INFO 2444 --- [ main] ConditionEvaluationReportLoggingListener :
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2021-10-08 21:35:26.299 ERROR 2444 --- [ main] o.s.boot.SpringApplication : Application run failed
org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'tomcatServletWebServerFactory' defined in class path resource [org/springframework/boot/autoconfigure/web/servlet/ServletWebServerFactoryConfiguration$EmbeddedTomcat.class]: Initialization of bean failed; nested exception is java.lang.IllegalArgumentException: ContextPath must start with '/' and not end with '/'
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:163) ~[spring-boot-2.5.2.jar:2.5.2]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:577) ~[spring-context-5.3.8.jar:5.3.8]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145) ~[spring-boot-2.5.2.jar:2.5.2]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:754) [spring-boot-2.5.2.jar:2.5.2]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:434) [spring-boot-2.5.2.jar:2.5.2]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:338) [spring-boot-2.5.2.jar:2.5.2]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1343) [spring-boot-2.5.2.jar:2.5.2]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1332) [spring-boot-2.5.2.jar:2.5.2]
at com.company.bolejob.BolejobApplication.main(BolejobApplication.java:14) [classes/:na]
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'tomcatServletWebServerFactory' defined in class path resource [org/springframework/boot/autoconfigure/web/servlet/ServletWebServerFactoryConfiguration$EmbeddedTomcat.class]: Initialization of bean failed; nested exception is java.lang.IllegalArgumentException: ContextPath must start with '/' and not end with '/'
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:610) ~[spring-beans-5.3.8.jar:5.3.8]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524) ~[spring-beans-5.3.8.jar:5.3.8]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.8.jar:5.3.8]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.8.jar:5.3.8]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.8.jar:5.3.8]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:213) ~[spring-beans-5.3.8.jar:5.3.8]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.getWebServerFactory(ServletWebServerApplicationContext.java:217) ~[spring-boot-2.5.2.jar:2.5.2]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:180) ~[spring-boot-2.5.2.jar:2.5.2]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:160) ~[spring-boot-2.5.2.jar:2.5.2]
... 8 common frames omitted
Caused by: java.lang.IllegalArgumentException: ContextPath must start with '/' and not end with '/'
at org.springframework.boot.web.servlet.server.AbstractServletWebServerFactory.checkContextPath(AbstractServletWebServerFactory.java:138) ~[spring-boot-2.5.2.jar:2.5.2]
at org.springframework.boot.web.servlet.server.AbstractServletWebServerFactory.setContextPath(AbstractServletWebServerFactory.java:127) ~[spring-boot-2.5.2.jar:2.5.2]
at org.springframework.boot.context.properties.PropertyMapper$Source.to(PropertyMapper.java:316) ~[spring-boot-2.5.2.jar:2.5.2]
at org.springframework.boot.autoconfigure.web.servlet.ServletWebServerFactoryCustomizer.customize(ServletWebServerFactoryCustomizer.java:66) ~[spring-boot-autoconfigure-2.5.2.jar:2.5.2]
at org.springframework.boot.autoconfigure.web.servlet.ServletWebServerFactoryCustomizer.customize(ServletWebServerFactoryCustomizer.java:39) ~[spring-boot-autoconfigure-2.5.2.jar:2.5.2]
at org.springframework.boot.web.server.WebServerFactoryCustomizerBeanPostProcessor.lambda$postProcessBeforeInitialization$0(WebServerFactoryCustomizerBeanPostProcessor.java:72) ~[spring-boot-2.5.2.jar:2.5.2]
at org.springframework.boot.util.LambdaSafe$Callbacks.lambda$null$0(LambdaSafe.java:287) ~[spring-boot-2.5.2.jar:2.5.2]
at org.springframework.boot.util.LambdaSafe$LambdaSafeCallback.invoke(LambdaSafe.java:159) ~[spring-boot-2.5.2.jar:2.5.2]
at org.springframework.boot.util.LambdaSafe$Callbacks.lambda$invoke$1(LambdaSafe.java:286) ~[spring-boot-2.5.2.jar:2.5.2]
at java.util.ArrayList.forEach(ArrayList.java:1259) ~[na:1.8.0_301]
at java.util.Collections$UnmodifiableCollection.forEach(Collections.java:1082) ~[na:1.8.0_301]
at org.springframework.boot.util.LambdaSafe$Callbacks.invoke(LambdaSafe.java:286) ~[spring-boot-2.5.2.jar:2.5.2]
at org.springframework.boot.web.server.WebServerFactoryCustomizerBeanPostProcessor.postProcessBeforeInitialization(WebServerFactoryCustomizerBeanPostProcessor.java:72) ~[spring-boot-2.5.2.jar:2.5.2]
at org.springframework.boot.web.server.WebServerFactoryCustomizerBeanPostProcessor.postProcessBeforeInitialization(WebServerFactoryCustomizerBeanPostProcessor.java:58) ~[spring-boot-2.5.2.jar:2.5.2]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:422) ~[spring-beans-5.3.8.jar:5.3.8]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1778) ~[spring-beans-5.3.8.jar:5.3.8]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:602) ~[spring-beans-5.3.8.jar:5.3.8]
... 16 common frames omitted
Process finished with exit code 1
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2、原因分析
经过分析得知，ContextPath必须开始于 / ，并且不能以/结尾。而application.properties文件中的实际配置如下：
### Server
server.port=8888
### Context
server.servlet.context-path= bolejob
1234
3、解决
将application.properties文件中的配置修改如下：
### Server
server.port=8888
### Context
server.servlet.context-path= /bolejob
1234
重启该Spring boot项目，便能启动成功。
完整的Run输出如下：
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.5.2)
2021-10-08 21:49:41.217 INFO 13616 --- [ main] com.company.bolejob.BolejobApplication : Starting BolejobApplication using Java 1.8.0_301 on GOLDENUNION with PID 13616 (E:\Projects-Idea\ProjectBootBoleJob\target\classes started by liuzh in E:\Projects-Idea\ProjectBootBoleJob)
2021-10-08 21:49:41.230 INFO 13616 --- [ main] com.company.bolejob.BolejobApplication : No active profile set, falling back to default profiles: default
2021-10-08 21:49:42.510 INFO 13616 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8888 (http)
2021-10-08 21:49:42.518 INFO 13616 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2021-10-08 21:49:42.518 INFO 13616 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.48]
2021-10-08 21:49:42.520 INFO 13616 --- [ main] o.a.catalina.core.AprLifecycleListener : Loaded Apache Tomcat Native library [1.2.31] using APR version [1.7.0].
2021-10-08 21:49:42.520 INFO 13616 --- [ main] o.a.catalina.core.AprLifecycleListener : APR capabilities: IPv6 [true], sendfile [true], accept filters [false], random [true], UDS [true].
2021-10-08 21:49:42.520 INFO 13616 --- [ main] o.a.catalina.core.AprLifecycleListener : APR/OpenSSL configuration: useAprConnector [false], useOpenSSL [true]
2021-10-08 21:49:42.523 INFO 13616 --- [ main] o.a.catalina.core.AprLifecycleListener : OpenSSL successfully initialized [OpenSSL 1.1.1l 24 Aug 2021]
2021-10-08 21:49:42.612 INFO 13616 --- [ main] o.a.c.c.C.[.[localhost].[/bolejob] : Initializing Spring embedded WebApplicationContext
2021-10-08 21:49:42.613 INFO 13616 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1340 ms
2021-10-08 21:49:43.074 INFO 13616 --- [ main] o.s.b.a.w.s.WelcomePageHandlerMapping : Adding welcome page: class path resource [static/index.html]
2021-10-08 21:49:43.163 INFO 13616 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8888 (http) with context path '/bolejob'
2021-10-08 21:49:43.619 INFO 13616 --- [ main] com.company.bolejob.BolejobApplication : Started BolejobApplication in 2.884 seconds (JVM running for 3.894)
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