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tomcat启动springMVC正常，但是普通方法启动springMVC总是报错，No ServletContext set

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净净一隅

#1 Created at ... [Delete] [Delete and Lock User]

tomcat启动spring正常，

但是普通方法启动spring总是报错 ，No ServletContext set, 

去掉AppConfig的@EnableWebMvc、createWebMvcConfigurer、createViewResolver 才可以。 

学习本章之前(MVC高级开发~JDBC)，我一直都是这么启动普通方法，没问题，到了springMVC就不行了

普通方法启动：

public static void main(String[] args) {
ApplicationContext context = new AnnotationConfigApplicationContext(AppConfig.class); 

UserService userService=context.getBean(UserService.class);

.....

}

Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'resourceHandlerMapping' defined in org.springframework.web.servlet.config.annotation.DelegatingWebMvcConfiguration: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.HandlerMapping]: Factory method 'resourceHandlerMapping' threw exception; nested exception is java.lang.IllegalStateException: No ServletContext set

at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:645)

at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:625)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1338)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1177)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:557)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517)

at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323)

at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)

at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321)

at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)

at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:879)

at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:878)

at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550)

at org.springframework.context.annotation.AnnotationConfigApplicationContext.<init>(AnnotationConfigApplicationContext.java:89)

at com.Application.main(Application.java:21)

Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.HandlerMapping]: Factory method 'resourceHandlerMapping' threw exception; nested exception is java.lang.IllegalStateException: No ServletContext set

at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185)

at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:640)

... 14 more

Caused by: java.lang.IllegalStateException: No ServletContext set

at org.springframework.util.Assert.state(Assert.java:73)

at org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport.resourceHandlerMapping(WebMvcConfigurationSupport.java:525)

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.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154)

... 15 more

廖雪峰

#2 Created at ... [Delete] [Delete and Lock User]

你仔细看教程是怎么启动Spring MVC的：

public static void main(String[] args) throws Exception {
    Tomcat tomcat = new Tomcat();
    tomcat.setPort(Integer.getInteger("port", 8080));
    tomcat.getConnector();
    Context ctx = tomcat.addWebapp("", new File("src/main/webapp").getAbsolutePath());
    WebResourceRoot resources = new StandardRoot(ctx);
    resources.addPreResources(
            new DirResourceSet(resources, "/WEB-INF/classes", new File("target/classes").getAbsolutePath(), "/"));
    ctx.setResources(resources);
    tomcat.start();
    tomcat.getServer().await();
}

这和之前的main方法完全不同，Web必须要有Tomcat这类服务器，不是一个普通的ApplicationContext

净净一隅

#3 Created at ... [Delete] [Delete and Lock User]

这样启动是没问题呀，我一直都是这样启动tomcat

我的疑惑是，如果我只是简单测试 service类的某一个方法，并不想通过tomcat启动整个项目。

改怎么弄

廖雪峰

#4 Created at ... [Delete] [Delete and Lock User]

写单独的测试

public class AppTest {
    public static void main(String[]args) {
...

你不能既要MVC又不启动tomcat，那谁来提供servlet容器？

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