为什么jenkins显示git，maven not found错误甚至git和maven安装？

“你好，希望你一切都好。我是Jenkins的新手，在实践中遇到了错误。我拿了一个样本项目。错误和Jenkins文件内容张贴在下面，请看看它。有什么问题尽管问。请提出解决方案。
感谢您的支持和帮助。`

Error as below

Started by user admin
Obtained Jenkins-decnew from git https://github.com/kdhani/myweb-p1.git
[Pipeline] Start of Pipeline
[Pipeline] node
Running on Jenkins in /var/lib/jenkins/workspace/pipeline1
[Pipeline] {
[Pipeline] stage
[Pipeline] { (Declarative: Checkout SCM)
[Pipeline] checkout
**Selected Git installation does not exist. Using Default
**The recommended git tool is: NONE
using credential gitid
 > /usr/bin/git rev-parse --resolve-git-dir /var/lib/jenkins/workspace/pipeline1/.git # timeout=10
Fetching changes from the remote Git repository
 > /usr/bin/git config remote.origin.url https://github.com/kdhani/myweb-p1.git # timeout=10
Fetching upstream changes from https://github.com/kdhani/myweb-p1.git
 > /usr/bin/git --version # timeout=10
 > git --version # 'git version 2.40.1'
using GIT_ASKPASS to set credentials 
 > /usr/bin/git fetch --tags --force --progress -- https://github.com/kdhani/myweb-p1.git +refs/heads/*:refs/remotes/origin/* # timeout=10
 > /usr/bin/git rev-parse refs/remotes/origin/master^{commit} # timeout=10
Checking out Revision c8f4db412eaf023b2ae78c1a9e168db17ea6ac73 (refs/remotes/origin/master)
 > /usr/bin/git config core.sparsecheckout # timeout=10
 > /usr/bin/git checkout -f c8f4db412eaf023b2ae78c1a9e168db17ea6ac73 # timeout=10
Commit message: "Update Jenkins-decnew"
 > /usr/bin/git rev-list --no-walk c8f4db412eaf023b2ae78c1a9e168db17ea6ac73 # timeout=10
[Pipeline] }
[Pipeline] // stage
[Pipeline] withEnv
[Pipeline] {
[Pipeline] withEnv
[Pipeline] {
[Pipeline] stage
[Pipeline] { (Git Checkout)
[Pipeline] git
Selected Git installation does not exist. Using Default
The recommended git tool is: NONE
using credential gitid
 > /usr/bin/git rev-parse --resolve-git-dir /var/lib/jenkins/workspace/pipeline1/.git # timeout=10
Fetching changes from the remote Git repository
 > /usr/bin/git config remote.origin.url https://github.com/kdhani/myweb-p1.git # timeout=10
Fetching upstream changes from https://github.com/kdhani/myweb-p1.git
 > /usr/bin/git --version # timeout=10
 > git --version # 'git version 2.40.1'
using GIT_ASKPASS to set credentials 
 > /usr/bin/git fetch --tags --force --progress -- https://github.com/kdhani/myweb-p1.git +refs/heads/*:refs/remotes/origin/* # timeout=10
 > /usr/bin/git rev-parse refs/remotes/origin/master^{commit} # timeout=10
Checking out Revision c8f4db412eaf023b2ae78c1a9e168db17ea6ac73 (refs/remotes/origin/master)
 > /usr/bin/git config core.sparsecheckout # timeout=10
 > /usr/bin/git checkout -f c8f4db412eaf023b2ae78c1a9e168db17ea6ac73 # timeout=10
 > /usr/bin/git branch -a -v --no-abbrev # timeout=10
 > /usr/bin/git branch -D master # timeout=10
 > /usr/bin/git checkout -b master c8f4db412eaf023b2ae78c1a9e168db17ea6ac73 # timeout=10
Commit message: "Update Jenkins-decnew"
[Pipeline] }
[Pipeline] // stage
[Pipeline] stage
[Pipeline] { (Maven Build)
[Pipeline] sh
**+ mvn clean package
**/var/lib/jenkins/workspace/pipeline1@tmp/durable-7e042d4d/script.sh: line 1: **mvn: command not found**
[Pipeline] }
[Pipeline] // stage
[Pipeline] stage
[Pipeline] { (deploy-dev)
Stage "deploy-dev" skipped due to earlier failure(s)
[Pipeline] }
[Pipeline] // stage
[Pipeline] }
[Pipeline] // withEnv
[Pipeline] }
[Pipeline] // withEnv
[Pipeline] }
[Pipeline] // node
[Pipeline] End of Pipeline
ERROR: script returned exit code 127
Finished: FAILURE
REST API
Jenkins 2.401.1

jenkins file content from here :)

pipeline{

    agent any
    
    environment{
        PATH = "/opt/maven3/bin:$PATH"
    }
    stages{
        stage("Git Checkout"){
            steps{
                git credentialsId: 'gitid', url: 'https://github.com/kdhani/myweb-p1.git'
            }
        }
        stage("Maven Build"){
            steps{
                sh "mvn clean package"
                sh "mv target/*.war target/myweb.war"
            }
        }
        stage("deploy-dev"){
            steps{
                sshagent(['tomcat-new']) {
                    
                sh """
                    scp -o StrictHostKeyChecking=no target/myweb.war  ec2-user@172.31.33.108:/home/ec2-user/apache-tomcat-9.0.63/webapps/
                    
                    ssh ec2-user@172.31.33.108 /home/ec2-user/apache-tomcat-9.0.63/bin/shutdown.sh
                    
                    ssh ec2-user@172.31.33.108 /home/ec2-user/apache-tomcat-9.0.63/bin/startup.sh
                
                """
            }
            
            }
        }
    }
}

首先，在代理路径上找到git，否则Jenkins将无法克隆/恢复（检出）您的存储库。
其次，error只适用于Maven：

**/var/lib/jenkins/workspace/pipeline1@tmp/durable-7e042d4d/script.sh: 
line 1: **mvn: command not found**

如果你有Pipeline Maven集成，请检查你的Jenkins“全局工具配置”设置页面：

确保您声明了一个Maven，其路径对于运行它的代理有效。
查看“Configuring Java and Maven in Jenkins”以获取插图。
您还可以将maven参数添加到作业中：

node ("windows") {
  stage ('Build') {

    git url: 'https://github.com/cyrille-leclerc/multi-module-maven-project'

    withMaven(
        // Maven installation declared in the Jenkins "Global Tool Configuration"
        maven: 'maven-3', // (1)
        // Use `$WORKSPACE/.repository` for local repository folder to avoid shared repositories
        mavenLocalRepo: '.repository', // (2)
        // Maven settings.xml file defined with the Jenkins Config File Provider Plugin
        // We recommend to define Maven settings.xml globally at the folder level using
        // navigating to the folder configuration in the section "Pipeline Maven Configuration / Override global Maven configuration"
        // or globally to the entire master navigating to  "Manage Jenkins / Global Tools Configuration"
        mavenSettingsConfig: 'my-maven-settings' // (3)
    ) {

      // Run the maven build
      sh "mvn clean verify"

    } // withMaven will discover the generated Maven artifacts, JUnit Surefire & FailSafe & FindBugs & SpotBugs reports...
  }
}

为什么jenkins显示git，maven not found错误甚至git和maven安装？

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