No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?(Mac)

前言

No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?

翻译 : 此环境中不提供编译器。也许您在 JRE 而不是 JDK 上运行？
考虑可能是因为运行环境真的是在JRE 而不是 JDK 上运行

• Mac环境
• 打包编译 dubbo-samples-protobuf 时

思路

检查 Maven 命令

• mvn -version

Apache Maven 3.6.0 (.......)
Maven home: /usr/local/maven3
Java version: 1.8.0_221, vendor: Oracle Corporation, runtime: /Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home
Default locale: zh_CN, platform encoding: UTF-8
OS info....

检查 Java 命令

• java -version

$ java -version
java version "1.8.0_221"
Java(TM) SE Runtime Environment (build 1.8.0_221-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.221-b11, mixed mode)

• 有多 jdk 版本, 检查可能有误

$ /usr/libexec/java_home -V
Matching Java Virtual Machines (4):
    13.0.2 (x86_64) "Oracle Corporation" - "Java SE 13.0.2" /Library/Java/JavaVirtualMachines/jdk-13.0.2.jdk/Contents/Home
    11.0.7 (x86_64) "Oracle Corporation" - "Java SE 11.0.7" /Library/Java/JavaVirtualMachines/jdk-11.0.7.jdk/Contents/Home
    1.8.221.11 (x86_64) "Oracle Corporation" - "Java" /Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home
    1.8.0_221 (x86_64) "Oracle Corporation" - "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_221.jdk/Contents/Home

结合上面两类命令的检查, 大致定位为 Mac 系统升级的问题

解决办法

为 Maven 指定 JDK 路径

• 查看 Maven 的安装路径: mvn -version

Apache Maven 3.6.0 (.......)
Maven home: /usr/local/maven3
Java version: 1.8.0_221, vendor: Oracle Corporation, runtime: /Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home
Default locale: zh_CN, platform encoding: UTF-8
OS info....

• 进入 Maven 安装目录的 bin 目录: cd /usr/local/maven3/bin

$ cd /usr/local/maven3/bin
m2.conf
mvn
mvn.cmd
mvnDebug
mvnDebug.cmd
mvnyjp

• 编辑文件 mvn : vim mvn, 在文件开头添加一行声明:

 JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_221.jdk/Contents/Home

• 保存后退出(:wq)

• 再次打包编译 dubbo-samples-protobuf 成功

  
  

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参考来源

Macbook idea:No compiler is provided in this environment. Perhaps you are running on a JRE...