spring-boot启动不了，报错 java.lang.NoClassDefFoundError: javax/servlet/ServletContext

找了半天，pom配置文件中更改一下配置即可，

<dependency>
   <groupId>org.springframework.bootgroupId>
   <artifactId>spring-boot-starter-tomcatartifactId>
   <scope>providedscope>
dependency>

把scopt注释掉即可；之前尝试将provided改为runtime也没用.

staceoverflow链接如下:

http://stackoverflow.com/questions/30374316/spring-boot-java-lang-noclassdeffounderror-javax-servlet-filter