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Question

D:\litemall>mvn -U clean install
[INFO] Scanning for projects...
[INFO] Artifact org.springframework.boot:spring-boot-starter-parent:pom:2.1.5.RELEASE is present in the local repository, but cached from a remote repository ID that is unavailable in current build context, verifying that is downloadable from [aliyun (https://maven.aliyun.com/nexus/content/repositories/central, default, releases, blocked)]
[INFO] Artifact org.springframework.boot:spring-boot-starter-parent:pom:2.1.5.RELEASE is present in the local repository, but cached from a remote repository ID that is unavailable in current build context, verifying that is downloadable from [aliyun (https://maven.aliyun.com/nexus/content/repositories/central, default, releases, blocked)]
[ERROR] [ERROR] Some problems were encountered while processing the POMs:
[FATAL] Non-resolvable parent POM for org.linlinjava:litemall:0.1.0: The following artifacts could not be resolved: org.springframework.boot:spring-boot-starter-parent:pom:2.1.5.RELEASE (present, but unavailable): Could not transfer artifact org.springframework.boot:spring-boot-starter-parent:pom:2.1.5.RELEASE from/to aliyun (https://maven.aliyun.com/nexus/content/repositories/central): Blocked mirror for repositories: [central (https://repo.maven.apache.org/maven2, default, releases)] and 'parent.relativePath' points at wrong local POM @ line 10, column 13
@
[ERROR] The build could not read 1 project -> [Help 1]
[ERROR]
[ERROR] The project org.linlinjava:litemall:0.1.0 (D:\litemall\pom.xml) has 1 error
[ERROR] Non-resolvable parent POM for org.linlinjava:litemall:0.1.0: The following artifacts could not be resolved: org.springframework.boot:spring-boot-starter-parent:pom:2.1.5.RELEASE (present, but unavailable): Could not transfer artifact org.springframework.boot:spring-boot-starter-parent:pom:2.1.5.RELEASE from/to aliyun (https://maven.aliyun.com/nexus/content/repositories/central): Blocked mirror for repositories: [central (https://repo.maven.apache.org/maven2, default, releases)] and 'parent.relativePath' points at wrong local POM @ line 10, column 13 -> [Help 2]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/ProjectBuildingException
[ERROR] [Help 2] http://cwiki.apache.org/confluence/display/MAVEN/UnresolvableModelException

Answer 1

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看起来你在尝试通过Maven构建一个基于Spring Boot的应用程序，但是遇到了问题。错误信息表明Spring Boot的 starter parent POM（项目对象模型）版本2.1.5.RELEASE无法从阿里云的Maven仓库下载。

这里有几个可能的解决步骤：

1. 检查网络连接：确保你的计算机可以访问互联网，并且没有防火墙或其他安全设置阻止对https://maven.aliyun.com的访问。

2. 更新Maven本地缓存：有时候，即使远程仓库可用，旧的、不可达的镜像条目可能会导致这个问题。尝试清空本地Maven缓存，然后重新运行mvn clean install命令。可以在.m2目录下找到Maven的本地存储库（默认情况下在用户主目录下），删除repository文件夹的内容。

3. 镜像问题：错误提示说镜像被阻塞了，检查你的Maven配置文件（通常是~/.m2/settings.xml）中是否有正确的 mirrors 设置。如果有的话，确认它们指向正确的URL，并且这些URL是可以访问的。

4. 确保parent POM引用正确：在你的项目pom.xml中，确认Spring Boot的parent POM引用是正确的。这通常在<parent>元素中指定。例如：

   <parent>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-parent</artifactId>
       <version>2.1.5.RELEASE</version>
   </parent>
   

   如果版本号不是最新的，尝试更新到一个可获取的版本。

5. 使用不同的Maven仓库：如果阿里云的仓库不可用，你可以选择使用其他官方的或可靠的Maven仓库，比如中央仓库。修改你的settings.xml文件中的mirrors部分，或者在命令行中添加 -DaltDeploymentRepository=local-repo::default::file:///path/to/local/repo 参数，这样Maven会优先从本地仓库查找依赖。

6. 使用最新版的Spring Boot：如果可能，考虑升级到较新的Spring Boot版本，以避免因旧版本不再维护而引起的下载问题。

如果你仍然遇到问题，或者不清楚如何执行上述步骤，请提供更详细的项目结构和pom.xml内容，我会更好地协助你解决。