启动SpringBoot报错?报错

刚开始学习Spring-boot 

按照网路视频上进行的配置

这是我的pom文件，只有三处引用

1、parent标签            spring-boot-starter-parent

2、dependency标签  spring-context

3、dependency标签 spring-boot-starter

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.edu</groupId>
    <artifactId>spring2</artifactId>
    <version>1.0.0</version>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.6.RELEASE</version>
    </parent>
    <name>springboot</name>
    <url>http://maven.apache.org</url>
    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.3.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
            <version>1.5.6.RELEASE</version>
        </dependency>
    </dependencies>
</project>

但是只有如下的包被依赖到了

parent标签没有接收到任何依赖，parent引入的是一个pom.xml文件

这是我的程序入口

@SpringBootApplication
public class App {
    public static void main(String[] args){
        ConfigurableApplicationContext context = SpringApplication.run(App.class, args);
        User user = context.getBean("user", User.class);
        user.show();
    }
    @Bean("user")
    public User createUser(){
        return new User();
    }
}

一执行就会包找不到Spring-expression的问题

java.lang.NoClassDefFoundError: org/springframework/expression/ParserContext
    at org.springframework.context.support.AbstractApplicationContext.prepareBeanFactory(AbstractApplicationContext.java:629) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:517) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
    at org.springframework.boot.context.embedd

分析应该是parent的标签没有起作

搞了好长时间没有搞好，有时间的兄弟，帮忙给看看吧