'dependencies.dependency.(groupId:artifactId:type:classifier)' must be unique: org.springframework:spring-webmvc:jar
dependency.(groupId:artifactId:type:classifier)' must be unique:依赖必须是唯一的
duplicate declaration of version :重复申明版本
解决:检查自己的pox.xml中是否重复依赖了spring-webmvc