学习《深入实践Spring Boot》中ing...

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#Spring Boot记录

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at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFa ctory.getTomcatWebServer(TomcatServletWebServerFactory.java:440) [jar:rsrc:sprin g-boot-2.3.12.RELEASE.jar!/:na] at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFa ctory.getWebServer(TomcatServletWebServerFactory.java:193) [jar:rsrc:spring-boot -2.3.12.RELEASE.jar!/:na] at org.springframework.boot.web.servlet.context.ServletWebServerApplicat ionContext.createWebServer(ServletWebServerApplicationContext.java:178) [jar:rsr c:spring-boot-2.3.12.RELEASE.jar!/:na] at org.springframework.boot.web.servlet.context.ServletWebServerApplicat ionContext.onRefresh(ServletWebServerApplicationContext.java:158) [jar:rsrc:spri ng-boot-2.3.12.RELEASE.jar!/:na] at org.springframework.context.support.AbstractApplicationContext.refres h(AbstractApplicationContext.java:545) [jar:rsrc:spring-context-5.2.15.RELEASE.j ar!/:na] at org.springframework.boot.web.servlet.context.ServletWebServerApplicat ionContext.refresh(ServletWebServerApplicationContext.java:143) [jar:rsrc:spring -boot-2.3.12.RELEASE.jar!/:na] at org.springframework.boot.SpringApplication.refresh(SpringApplication. java:755) [jar:rsrc:spring-boot-2.3.12.RELEASE.jar!/:na] at org.springframework.boot.SpringApplication.refresh(SpringApplication. java:747) [jar:rsrc:spring-boot-2.3.12.RELEASE.jar!/:na] at org.springframework.boot.SpringApplication.refreshContext(SpringAppli cation.java:402) [jar:rsrc:spring-boot-2.3.12.RELEASE.jar!/:na] at org.springframework.boot.SpringApplication.run(SpringApplication.java :312) [jar:rsrc:spring-boot-2.3.12.RELEASE.jar!/:na] at org.springframework.boot.SpringApplication.run(SpringApplication.java :1247) [jar:rsrc:spring-boot-2.3.12.RELEASE.jar!/:na] at org.springframework.boot.SpringApplication.run(SpringApplication.java :1236) [jar:rsrc:spring-boot-2.3.12.RELEASE.jar!/:na] at com.kucun.DemoApplication.main(DemoApplication.java:41) [rsrc:./:na] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8. 0_31] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8. 0_31] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na: 1.8.0_31] at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_31] at org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoa der.java:58) [kucun2.jar:na] Caused by: org.apache.catalina.LifecycleException: A child container failed duri ng start at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.ja va:928) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java :829) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) [jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase. java:1384) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase. java:1374) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at java.util.concurrent.FutureTask.run(Unknown Source) ~[na:1.8.0_31] at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineEx ecutorService.java:75) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at java.util.concurrent.AbstractExecutorService.submit(Unknown Source) ~ [na:1.8.0_31] at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.ja va:909) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] ... 27 common frames omitted Caused by: java.util.concurrent.ExecutionException: org.apache.catalina.Lifecycl eException: Failed to initialize component [org.apache.catalina.webresources.Sta ndardRoot@b9f698] at java.util.concurrent.FutureTask.report(Unknown Source) ~[na:1.8.0_31] at java.util.concurrent.FutureTask.get(Unknown Source) ~[na:1.8.0_31] at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.ja va:916) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] ... 35 common frames omitted Caused by: org.apache.catalina.LifecycleException: Failed to initialize componen t [org.apache.catalina.webresources.StandardRoot@b9f698] at org.apache.catalina.util.LifecycleBase.handleSubClassException(Lifecy cleBase.java:440) [jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:139) [ jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:173) [jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at org.apache.catalina.core.StandardContext.resourcesStart(StandardConte xt.java:4830) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at org.apache.catalina.core.StandardContext.startInternal(StandardContex t.java:4966) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) [jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase. java:1384) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase. java:1374) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at java.util.concurrent.FutureTask.run(Unknown Source) ~[na:1.8.0_31] at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineEx ecutorService.java:75) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at java.util.concurrent.AbstractExecutorService.submit(Unknown Source) ~ [na:1.8.0_31] at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.ja va:909) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] ... 35 common frames omitted Caused by: java.lang.Error: factory already defined at java.net.URL.setURLStreamHandlerFactory(Unknown Source) ~[na:1.8.0_31 ] at org.apache.catalina.webresources.TomcatURLStreamHandlerFactory.<init> (TomcatURLStreamHandlerFactory.java:130) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar !/:na] at org.apache.catalina.webresources.TomcatURLStreamHandlerFactory.getIns tanceInternal(TomcatURLStreamHandlerFactory.java:53) ~[jar:rsrc:tomcat-embed-cor e-9.0.46.jar!/:na] at org.apache.catalina.webresources.TomcatURLStreamHandlerFactory.regist er(TomcatURLStreamHandlerFactory.java:77) ~[jar:rsrc:tomcat-embed-core-9.0.46.ja r!/:na] at org.apache.catalina.webresources.StandardRoot.registerURLStreamHandle rFactory(StandardRoot.java:700) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at org.apache.catalina.webresources.StandardRoot.initInternal(StandardRo ot.java:682) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:136) [ jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] ... 45 common frames omitted 2025-06-20 10:58:03.399 INFO 15168 --- [ main] o.apache.catalina.core .StandardService : Stopping service [Tomcat] 2025-06-20 10:58:09.641 WARN 15168 --- [ main] ConfigServletWebServer ApplicationContext : Exception encountered during context initialization - cance lling refresh attempt: org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.ser ver.WebServerException: Unable to start embedded Tomcat 2025-06-20 10:58:09.656 INFO 15168 --- [ main] ConditionEvaluationRep ortLoggingListener : Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled. 2025-06-20 10:58:11.076 ERROR 15168 --- [ main] o.s.boot.SpringApplica tion : Application run failed org.springframework.context.ApplicationContextException: Unable to start web ser ver; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat at org.springframework.boot.web.servlet.context.ServletWebServerApplicat ionContext.onRefresh(ServletWebServerApplicationContext.java:161) ~[jar:rsrc:spr ing-boot-2.3.12.RELEASE.jar!/:na] at org.springframework.context.support.AbstractApplicationContext.refres h(AbstractApplicationContext.java:545) ~[jar:rsrc:spring-context-5.2.15.RELEASE. jar!/:na] at org.springframework.boot.web.servlet.context.ServletWebServerApplicat ionContext.refresh(ServletWebServerApplicationContext.java:143) ~[jar:rsrc:sprin g-boot-2.3.12.RELEASE.jar!/:na] at org.springframework.boot.SpringApplication.refresh(SpringApplication. java:755) [jar:rsrc:spring-boot-2.3.12.RELEASE.jar!/:na] at org.springframework.boot.SpringApplication.refresh(SpringApplication. java:747) [jar:rsrc:spring-boot-2.3.12.RELEASE.jar!/:na] at org.springframework.boot.SpringApplication.refreshContext(SpringAppli cation.java:402) [jar:rsrc:spring-boot-2.3.12.RELEASE.jar!/:na] at org.springframework.boot.SpringApplication.run(SpringApplication.java :312) [jar:rsrc:spring-boot-2.3.12.RELEASE.jar!/:na] at org.springframework.boot.SpringApplication.run(SpringApplication.java :1247) [jar:rsrc:spring-boot-2.3.12.RELEASE.jar!/:na] at org.springframework.boot.SpringApplication.run(SpringApplication.java :1236) [jar:rsrc:spring-boot-2.3.12.RELEASE.jar!/:na] at com.kucun.DemoApplication.main(DemoApplication.java:41) [rsrc:./:na] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8. 0_31] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8. 0_31] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na: 1.8.0_31] at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_31] at org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoa der.java:58) [kucun2.jar:na] Caused by: org.springframework.boot.web.server.WebServerException: Unable to sta rt embedded Tomcat at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initiali ze(TomcatWebServer.java:142) ~[jar:rsrc:spring-boot-2.3.12.RELEASE.jar!/:na] at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(T omcatWebServer.java:104) ~[jar:rsrc:spring-boot-2.3.12.RELEASE.jar!/:na] at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFa ctory.getTomcatWebServer(TomcatServletWebServerFactory.java:440) ~[jar:rsrc:spri ng-boot-2.3.12.RELEASE.jar!/:na] at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFa ctory.getWebServer(TomcatServletWebServerFactory.java:193) ~[jar:rsrc:spring-boo t-2.3.12.RELEASE.jar!/:na] at org.springframework.boot.web.servlet.context.ServletWebServerApplicat ionContext.createWebServer(ServletWebServerApplicationContext.java:178) ~[jar:rs rc:spring-boot-2.3.12.RELEASE.jar!/:na] at org.springframework.boot.web.servlet.context.ServletWebServerApplicat ionContext.onRefresh(ServletWebServerApplicationContext.java:158) ~[jar:rsrc:spr ing-boot-2.3.12.RELEASE.jar!/:na] ... 14 common frames omitted Caused by: org.apache.catalina.LifecycleException: A child container failed duri ng start at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.ja va:928) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine. java:262) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at org.apache.catalina.core.StandardService.startInternal(StandardServic e.java:433) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at org.apache.catalina.core.StandardServer.startInternal(StandardServer. java:930) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at org.apache.catalina.startup.Tomcat.start(Tomcat.java:486) ~[jar:rsrc: tomcat-embed-core-9.0.46.jar!/:na] at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initiali ze(TomcatWebServer.java:123) ~[jar:rsrc:spring-boot-2.3.12.RELEASE.jar!/:na] ... 19 common frames omitted Caused by: java.util.concurrent.ExecutionException: org.apache.catalina.Lifecycl eException: A child container failed during start at java.util.concurrent.FutureTask.report(Unknown Source) ~[na:1.8.0_31] at java.util.concurrent.FutureTask.get(Unknown Source) ~[na:1.8.0_31] at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.ja va:916) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] ... 27 common frames omitted Caused by: org.apache.catalina.LifecycleException: A child container failed duri ng start at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.ja va:928) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java :829) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase. java:1384) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase. java:1374) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at java.util.concurrent.FutureTask.run(Unknown Source) ~[na:1.8.0_31] at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineEx ecutorService.java:75) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at java.util.concurrent.AbstractExecutorService.submit(Unknown Source) ~ [na:1.8.0_31] at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.ja va:909) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] ... 27 common frames omitted Caused by: java.util.concurrent.ExecutionException: org.apache.catalina.Lifecycl eException: Failed to initialize component [org.apache.catalina.webresources.Sta ndardRoot@b9f698] at java.util.concurrent.FutureTask.report(Unknown Source) ~[na:1.8.0_31] at java.util.concurrent.FutureTask.get(Unknown Source) ~[na:1.8.0_31] at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.ja va:916) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] ... 35 common frames omitted Caused by: org.apache.catalina.LifecycleException: Failed to initialize componen t [org.apache.catalina.webresources.StandardRoot@b9f698] at org.apache.catalina.util.LifecycleBase.handleSubClassException(Lifecy cleBase.java:440) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:139) ~ [jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:173) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at org.apache.catalina.core.StandardContext.resourcesStart(StandardConte xt.java:4830) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at org.apache.catalina.core.StandardContext.startInternal(StandardContex t.java:4966) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase. java:1384) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase. java:1374) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at java.util.concurrent.FutureTask.run(Unknown Source) ~[na:1.8.0_31] at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineEx ecutorService.java:75) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at java.util.concurrent.AbstractExecutorService.submit(Unknown Source) ~ [na:1.8.0_31] at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.ja va:909) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] ... 35 common frames omitted Caused by: java.lang.Error: factory already defined at java.net.URL.setURLStreamHandlerFactory(Unknown Source) ~[na:1.8.0_31 ] at org.apache.catalina.webresources.TomcatURLStreamHandlerFactory.<init> (TomcatURLStreamHandlerFactory.java:130) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar !/:na] at org.apache.catalina.webresources.TomcatURLStreamHandlerFactory.getIns tanceInternal(TomcatURLStreamHandlerFactory.java:53) ~[jar:rsrc:tomcat-embed-cor e-9.0.46.jar!/:na] at org.apache.catalina.webresources.TomcatURLStreamHandlerFactory.regist er(TomcatURLStreamHandlerFactory.java:77) ~[jar:rsrc:tomcat-embed-core-9.0.46.ja r!/:na] at org.apache.catalina.webresources.StandardRoot.registerURLStreamHandle rFactory(StandardRoot.java:700) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at org.apache.catalina.webresources.StandardRoot.initInternal(StandardRo ot.java:682) ~[jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:136) ~ [jar:rsrc:tomcat-embed-core-9.0.46.jar!/:na] ... 45 common frames omitted C:\Users\Administrator\Desktop>
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从您提供的错误日志来看，核心问题是 `java.lang.Error: factory already defined`，这导致 Spring Boot 无法启动嵌入式 Tomcat 服务器。以下是完整的解决方案： ### 问题原因分析 1. **URLStreamHandlerFactory ...
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