java.lang.NoClassDefFoundError: javax/servlet/ServletContext

方法1：把SpringBoot中main方法所在的class不再继承org.springframework.boot.context.web.SpringBootServletInitializer即可

因为继承org.springframework.boot.context.web.SpringBootServletInitializer，并重写里面的configure方法，即可将这个项目打成war，并部署到tomcat或其它jee容器中。

protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
    return builder.sources(Ch623Application.class);
}

方法2：

将此项目运行在一个jee容器下，譬如tomcat

2016-09-13 07:45:57.198 ERROR [main][org.springframework.boot.SpringApplication] Application startup failed

java.lang.NoClassDefFoundError: javax/servlet/ServletContext

    at java.lang.Class.getDeclaredMethods0(Native Method) ~[na:1.8.0_65]

Exception in thread "main" java.lang.NoClassDefFoundError: javax/servlet/ServletContext

    at java.lang.Class.privateGetDeclaredMethods(Class.java:2701) ~[na:1.8.0_65]

    at java.lang.Class.getDeclaredMethods0(Native Method)

    at java.lang.Class.getDeclaredMethods(Class.java:1975) ~[na:1.8.0_65]

    at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)

    at org.springframework.core.type.StandardAnnotationMetadata.getAnnotatedMethods(StandardAnnotationMetadata.java:140) ~[spring-core-4.2.0.RC1.jar:4.2.0.RC1]

    at java.lang.Class.getDeclaredMethods(Class.java:1975)

    at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:289) ~[spring-context-4.2.0.RC1.jar:4.2.0.RC1]

    at org.springframework.core.type.StandardAnnotationMetadata.getAnnotatedMethods(StandardAnnotationMetadata.java:140)    at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:229) ~[spring-context-4.2.0.RC1.jar:4.2.0.RC1]

    at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:196) ~[spring-context-4.2.0.RC1.jar:4.2.0.RC1]

    at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:165) ~[spring-context-4.2.0.RC1.jar:4.2.0.RC1]

    at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:321) ~[spring-context-4.2.0.RC1.jar:4.2.0.RC1]

    at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:243) ~[spring-context-4.2.0.RC1.jar:4.2.0.RC1]

    at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:289)

    at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:269) ~[spring-context-4.2.0.RC1.jar:4.2.0.RC1]

    at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:98) ~[spring-context-4.2.0.RC1.jar:4.2.0.RC1]

    at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:651) ~[spring-context-4.2.0.RC1.jar:4.2.0.RC1]

    at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:229)

    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:503) ~[spring-context-4.2.0.RC1.jar:4.2.0.RC1]

    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:678) [spring-boot-1.3.0.M1.jar:1.3.0.M1]

    at org.springframework.boot.SpringApplication.doRun(SpringApplication.java:339) [spring-boot-1.3.0.M1.jar:1.3.0.M1]

    at org.springframework.boot.SpringApplication.run(SpringApplication.java:274) [spring-boot-1.3.0.M1.jar:1.3.0.M1]

    at org.springframework.boot.SpringApplication.run(SpringApplication.java:931) [spring-boot-1.3.0.M1.jar:1.3.0.M1]

    at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:196)

    at org.springframework.boot.SpringApplication.run(SpringApplication.java:920) [spring-boot-1.3.0.M1.jar:1.3.0.M1]

    at com.Ch623Application.main(Ch623Application.java:36) [classes/:na]

    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_65]

    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_65]

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_65]

    at java.lang.reflect.Method.invoke(Method.java:497) ~[na:1.8.0_65]

    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147) [idea_rt.jar:na]

Caused by: java.lang.ClassNotFoundException: javax.servlet.ServletContext

    at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[na:1.8.0_65]

    at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_65]

    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) ~[na:1.8.0_65]

    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_65]

    ... 25 common frames omitted

    at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:165)

    at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:321)

    at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:243)

    at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:269)

    at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:98)

    at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:651)

    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:503)

    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:678)

    at org.springframework.boot.SpringApplication.doRun(SpringApplication.java:339)

    at org.springframework.boot.SpringApplication.run(SpringApplication.java:274)

    at org.springframework.boot.SpringApplication.run(SpringApplication.java:931)

    at org.springframework.boot.SpringApplication.run(SpringApplication.java:920)

    at com.Ch623Application.main(Ch623Application.java:36)

    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:497)

    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)

Caused by: java.lang.ClassNotFoundException: javax.servlet.ServletContext

    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)

    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)

    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

    ... 25 more

2016-09-13 07:45:57.211 INFO  [Thread-1][org.springframework.context.annotation.AnnotationConfigApplicationContext] Closing org.springframework.context.annotation.AnnotationConfigApplicationContext@b48321: startup date [Tue Sep 13 07:45:54 CST 2016]; root of context hierarchy

2016-09-13 07:45:57.213 WARN  [Thread-1][org.springframework.context.annotation.AnnotationConfigApplicationContext] Exception thrown from LifecycleProcessor on context close

java.lang.IllegalStateException: LifecycleProcessor not initialized - call 'refresh' before invoking lifecycle methods via the context: org.springframework.context.annotation.AnnotationConfigApplicationContext@b48321: startup date [Tue Sep 13 07:45:54 CST 2016]; root of context hierarchy

    at org.springframework.context.support.AbstractApplicationContext.getLifecycleProcessor(AbstractApplicationContext.java:398) ~[spring-context-4.2.0.RC1.jar:4.2.0.RC1]

    at org.springframework.context.support.AbstractApplicationContext.doClose(AbstractApplicationContext.java:932) ~[spring-context-4.2.0.RC1.jar:4.2.0.RC1]

    at org.springframework.context.support.AbstractApplicationContext$1.run(AbstractApplicationContext.java:859) [spring-context-4.2.0.RC1.jar:4.2.0.RC1]

2016-09-13 07:45:57.214 DEBUG [Thread-1][org.springframework.beans.factory.support.DefaultListableBeanFactory] Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@1fe63b9: defining beans [org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,org.springframework.context.event.internalEventListenerProcessor,org.springframework.context.event.internalEventListenerFactory,ch623Application,org.springframework.context.annotation.ConfigurationClassPostProcessor.importAwareProcessor,org.springframework.context.annotation.ConfigurationClassPostProcessor.enhancedConfigurationProcessor,authorSettings,settingsConfig,threadSettings,eventBusConfig,observer1,observer2,subject,businessService,helloJob,quartzConfig,quartzMain,scheduledTaskService,schedulerConfig,asyncTaskService,taskExecutorConfig]; root of factory hierarchy

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