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idea中服务正常启动，但是打成jar包后出现Tomcat无法启动错误-创新互联

idea中服务正常启动，但是打成jar包后出现Tomcat无法启动错误

本地运行一切正常，但是我打成jar包放到线上运行的时候就报了这个错误， 从第一行错误信息看就是Tomcat无法启动，网上找了一些资料，有的说是Tomcat版本的问题，有的说是依赖问题，解决问题最终还是要靠自己动手！

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先说结论：依赖冲突导致install的时候有的包没有打进去，所以解决依赖冲突就好了

再说思路：首先，异常信息很明显告诉我们Tomcat启动不了，再往下看发现这个问题是由于类没有找到引起的

Caused by: java.lang.ClassNotFoundException: com.fasterxml.jackson.databind.exc.InvalidDefinitionException

但是我们本地运行是一切正常的，就只是打包之后出了这个问题，打包插件用的是

spring-boot-maven-plugin

问题应该不大，所以决定和网上说的一样排查一下依赖的冲突问题，利用maven-help插件还是很容易解决依赖冲突的，发现确实存在jackson相关依赖的冲突，解决之后再打包果真就好了，至于为什么不先排查Tomcat是因为我在本地java -jar xxx.jar 和 在服务器上执行的结果一样，所以我觉得两台服务器Tomcat同时出现问题的概率比较低，而内嵌的Tomcat我认为是比较稳定的，至少是经过大多数考验的，出现问题的概率应该也不大，所以决定先从自己身上找原因

疑惑之处：为什么本地idea中没有暴露出依赖冲突问题而是在打包完成之后才出现？有知道的大佬麻烦指点一下，感激不尽！

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:156) ~[spring-boot-2.2.13.RELEASE.jar!/:2.2.13.RELEASE]
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:545) ~[spring-context-5.2.11.RELEASE.jar!/:5.2.11.RELEASE]
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.2.13.RELEASE.jar!/:2.2.13.RELEASE]
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) [spring-boot-2.2.13.RELEASE.jar!/:2.2.13.RELEASE]
        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:405) [spring-boot-2.2.13.RELEASE.jar!/:2.2.13.RELEASE]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-2.2.13.RELEASE.jar!/:2.2.13.RELEASE]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.2.13.RELEASE.jar!/:2.2.13.RELEASE]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) [spring-boot-2.2.13.RELEASE.jar!/:2.2.13.RELEASE]
        at com.gitee.small.Application.main(Application.java:28) [classes!/:na]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_261]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_261]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_261]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_261]
        at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:49) [small-demo.jar:na]
        at org.springframework.boot.loader.Launcher.launch(Launcher.java:108) [small-demo.jar:na]
        at org.springframework.boot.loader.Launcher.launch(Launcher.java:58) [small-demo.jar:na]
        at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:65) [small-demo.jar:na]
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) ~[spring-boot-2.2.13.RELEASE.jar!/:2.2.13.RELEASE]
        at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.(TomcatWebServer.java:87) ~[spring-boot-2.2.13.RELEASE.jar!/:2.2.13.RELEASE]
        at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:440) ~[spring-boot-2.2.13.RELEASE.jar!/:2.2.13.RELEASE]
        at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:193) ~[spring-boot-2.2.13.RELEASE.jar!/:2.2.13.RELEASE]
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:180) ~[spring-boot-2.2.13.RELEASE.jar!/:2.2.13.RELEASE]
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:153) ~[spring-boot-2.2.13.RELEASE.jar!/:2.2.13.RELEASE]
        ... 16 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'formContentFilter' defined in class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.web.servlet.filter.OrderedFormContentFilter]: Factory method 'formContentFilter' threw exception; nested exception is java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/exc/InvalidDefinitionException
        at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:645) ~[spring-beans-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:475) ~[spring-beans-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1338) ~[spring-beans-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1177) ~[spring-beans-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:557) ~[spring-beans-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) ~[spring-beans-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:207) ~[spring-beans-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at org.springframework.boot.web.servlet.ServletContextInitializerBeans.getOrderedBeansOfType(ServletContextInitializerBeans.java:211) ~[spring-boot-2.2.13.RELEASE.jar!/:2.2.13.RELEASE]
        at org.springframework.boot.web.servlet.ServletContextInitializerBeans.addAsRegistrationBean(ServletContextInitializerBeans.java:174) ~[spring-boot-2.2.13.RELEASE.jar!/:2.2.13.RELEASE]
        at org.springframework.boot.web.servlet.ServletContextInitializerBeans.addAsRegistrationBean(ServletContextInitializerBeans.java:169) ~[spring-boot-2.2.13.RELEASE.jar!/:2.2.13.RELEASE]
        at org.springframework.boot.web.servlet.ServletContextInitializerBeans.addAdaptableBeans(ServletContextInitializerBeans.java:154) ~[spring-boot-2.2.13.RELEASE.jar!/:2.2.13.RELEASE]
        at org.springframework.boot.web.servlet.ServletContextInitializerBeans.(ServletContextInitializerBeans.java:86) ~[spring-boot-2.2.13.RELEASE.jar!/:2.2.13.RELEASE]
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.getServletContextInitializerBeans(ServletWebServerApplicationContext.java:253) ~[spring-boot-2.2.13.RELEASE.jar!/:2.2.13.RELEASE]
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.selfInitialize(ServletWebServerApplicationContext.java:227) ~[spring-boot-2.2.13.RELEASE.jar!/:2.2.13.RELEASE]
        at org.springframework.boot.web.embedded.tomcat.TomcatStarter.onStartup(TomcatStarter.java:53) ~[spring-boot-2.2.13.RELEASE.jar!/:2.2.13.RELEASE]
        at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5166) ~[tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384) ~[tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374) ~[tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at java.util.concurrent.FutureTask.run(Unknown Source) ~[na:1.8.0_261]
        at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) ~[tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at java.util.concurrent.AbstractExecutorService.submit(Unknown Source) ~[na:1.8.0_261]
        at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909) ~[tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:843) ~[tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384) ~[tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374) ~[tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at java.util.concurrent.FutureTask.run(Unknown Source) ~[na:1.8.0_261]
        at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) ~[tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at java.util.concurrent.AbstractExecutorService.submit(Unknown Source) ~[na:1.8.0_261]
        at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909) ~[tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262) ~[tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.apache.catalina.core.StandardService.startInternal(StandardService.java:434) ~[tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:930) ~[tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.apache.catalina.startup.Tomcat.start(Tomcat.java:486) ~[tomcat-embed-core-9.0.41.jar!/:9.0.41]
        at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:106) ~[spring-boot-2.2.13.RELEASE.jar!/:2.2.13.RELEASE]
        ... 21 common frames omitted
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.web.servlet.filter.OrderedFormContentFilter]: Factory method 'formContentFilter' threw exception; nested exception is java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/exc/InvalidDefinitionException
        at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:640) ~[spring-beans-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        ... 62 common frames omitted
Caused by: java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/exc/InvalidDefinitionException
        at org.springframework.http.converter.support.AllEncompassingFormHttpMessageConverter.(AllEncompassingFormHttpMessageConverter.java:76) ~[spring-web-5.2.12.RELEASE.jar!/:5.2.12.RELEASE]
        at org.springframework.web.filter.FormContentFilter.(FormContentFilter.java:61) ~[spring-web-5.2.12.RELEASE.jar!/:5.2.12.RELEASE]
        at org.springframework.boot.web.servlet.filter.OrderedFormContentFilter.(OrderedFormContentFilter.java:29) ~[spring-boot-2.2.13.RELEASE.jar!/:2.2.13.RELEASE]
        at org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration.formContentFilter(WebMvcAutoConfiguration.java:173) ~[spring-boot-autoconfigure-2.2.13.RELEASE.jar!/:2.2.13.RELEASE]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_261]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_261]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_261]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_261]
        at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        ... 63 common frames omitted
Caused by: java.lang.ClassNotFoundException: com.fasterxml.jackson.databind.exc.InvalidDefinitionException
        at java.net.URLClassLoader.findClass(Unknown Source) ~[na:1.8.0_261]
        at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_261]
        at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:151) ~[small-demo.jar:na]
        at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_261]
        ... 72 common frames omitted

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分享题目：idea中服务正常启动，但是打成jar包后出现Tomcat无法启动错误-创新互联
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