eclipse新建maven項目：'Building' has encountered a problem. Errors occurred during the build.

一、eclipse 新建maven 項目報錯(因為沒有配置maven環境)

1、問題：

① 出現的問題1：

Could not calculate build plan:Plugin
org.apache.maven.plugins:maven-resources-plugin:2.6 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-resources-plugin:jar:2.6

② 出現的問題2：

'Building' has encountered a problem. Errors occurred during the build.

2、分析問題：

① 錯誤原因：編譯工具eclipse沒有配置 maven的環境

3、解決：在eclipse中配置maven的環境

##### 3-1、又出現bug：

• 報錯信息如下：

Description	Resource	Path	Location	Type
CoreException: Could not get the value for parameter compilerId for plugin execution default-compile: PluginResolutionException: Plugin org.apache.maven.plugins:maven-compiler-plugin:3.1 or one of its dependencies could not be resolved: Failed to collect dependencies at org.apache.maven.plugins:maven-compiler-plugin:jar:3.1 -> org.apache.maven.shared:maven-shared-incremental:jar:1.1 -> org.apache.maven:maven-core:jar:2.2.1 -> org.apache.maven:maven-profile:jar:2.2.1: ArtifactDescriptorException: Failed to read artifact descriptor for org.apache.maven:maven-profile:jar:2.2.1: ArtifactResolutionException: org.apache.maven:maven-profile:pom:2.2.1 failed to transfer from http://maven.aliyun.com/nexus/content/groups/public during a previous attempt. This failure was cached in the local repository and resolution is not reattempted until the update interval of nexus-aliyun has elapsed or updates are forced. Original error: Could not transfer artifact org.apache.maven:maven-profile:pom:2.2.1 from/to nexus-aliyun (http://maven.aliyun.com/nexus/content/groups/public): The operation was cancelled.	pom.xml	/ssm-xml-demo	line 6	Maven Project Build Lifecycle Mapping Problem

3-1、解決：在eclipse中強制更新maven的項目：快捷鍵 alt+f5，然后勾選 Force Update of Snapshots/Releases

二、補充一下 maven的環境搭建

Maven 環境搭建

一、准備工作：

1、maven下載：官網：https://maven.apache.org/download.cgi

• 下載完成后解壓出來

2、配置環境變量：

• 細節：為什么要單獨配置一個M2_HOME 的變量：方便后續學習

  • 后續使用的自動依賴的系統，比如SpringBoot、SpringCloud,它會引用M2_HOME 這個地址。

■ 添加系統變量：

□ M2_HOME maven目錄下的bin目錄

□ MAVEN_HOME maven的目錄

□ 在系統的path中配置 %MAVEN_HOME%\bin

■ 驗證maven是否配置成功：查看maven版本的命令 mvn -version

3、修改maven 配置文件的鏡像為 阿里雲鏡像

• 配置文件位置：maven根目錄/conf/settings.xml 找到鏡像元素mirrors

• 鏡像：mirrors：

  • 作用：加速下載
  • 默認是使用國外的鏡像，國內建議使用阿里雲鏡像加速下載

     <!-- 添加之前，先把原來的鏡像全注釋掉 -->
    <!-- 配置方式1 -->
     <mirror>
          <id>nexus-aliyun</id>
  　　　　 <mirrorOf>*,!jeecg,!jeecg-snapshots</mirrorOf>
          <name>Nexus aliyun</name>
          <url>http://maven.aliyun.com/nexus/content/groups/public</url>
      </mirror>
  

  <!-- 配置方式2 -->
	<mirror>
        <id>nexus-aliyun</id>
　　　　 <mirrorOf>central</mirrorOf>
        <name>Nexus aliyun</name>
        <url>http://maven.aliyun.com/nexus/content/groups/public</url>
    </mirror>

4、修改maven 配置文件的本地倉庫位置

• 修改本地倉庫位置為：maven 根目錄下 自己手動建立的 maven-repo
• 配置文件位置：maven根目錄/conf/settings.xml 找到 localRepository元素

  <localRepository>E:\environment\mavenEvironment\apache-maven-3.8.2\maven-repo</localRepository>