我在STS 3.9.6.RELEASE中创建新的Web应用程序（使用SpringBoot 2.0.6.RELEASE）后收到错误

项目构建错误：com.demo.springrest的不可解析的父POM：SpringRest：0.0.1-SNAPSHOT：无法传输org.springframework.boot：spring-boot-starter-parent：pom：2.0.6.RELEASE from https://repo.maven.apache.org/maven2缓存在本地存储库中，在中心的更新间隔过去或强制更新之前，不会重新尝试解析 . 原始错误：无法传输工件org.springframework.boot：spring-boot-starter-parent：pom：2.0.6.RELEASE from / to central（https://repo.maven.apache.org/maven2）：connect timed out和'parent.relativePath'指向没有本地POM

我试图清理maven本地存储库，但仍然是同样的问题 . 需要我们的帮助来解决它 . Sample POM file is as below :-

<?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.demo.springrest</groupId>
    <artifactId>SpringRest</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>SpringRest</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.6.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>