• 使用pipeline的时候mvn显示没有这个命令，但是java这个命令确实有的。
• 解决步骤：
• 从pipeline中输出环境变量：printenv
  发现里面PATH是这个

PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin

那我就去看这两个目录下面的命令。
然后只有这个

[lidengyin@ldy bin]$ ls -l | grep java
lrwxrwxrwx    1 root root          22 Apr  3 10:45 java -> /etc/alternatives/java
lrwxrwxrwx    1 root root          23 Apr  3 10:46 javac -> /etc/alternatives/javac

没有maven，这就好办了，加一个软链接

sudo ln -s /usr/local/software/apache-maven-3.6.3/bin/mvn /usr/bin/mvn

sudo ln -s /usr/local/software/apache-maven-3.6.3/bin/mvn /usr/local/bin/mvn

• 测试结果

+ java -version
java version "1.8.0_241"
Java(TM) SE Runtime Environment (build 1.8.0_241-b07)
Java HotSpot(TM) 64-Bit Server VM (build 25.241-b07, mixed mode)
+ mvn --version
Apache Maven 3.6.3 (cecedd343002696d0abb50b32b541b8a6ba2883f)
Maven home: /usr/local/software/apache-maven-3.6.3
Java version: 1.8.0_241, vendor: Oracle Corporation, runtime: /usr/local/software/jdk1.8.0_241/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "3.10.0-1062.1.1.el7.x86_64", arch: "amd64", family: "unix"

都可以了，成功