1. 問題描述
使用idea對Java工程執行mvn compile命令進行編譯，出現以下報錯：
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.5:compile (default-compile) on project test: Compilation failure
[ERROR] No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?
2. 問題分析
從報錯信息上看，是由於環境沒有提供編譯器，可能編譯過程運行在JRE上，而不是JDK上。
查看了idea項目配置的Java編譯器為JDK8，且配置的Java路徑正確。
執行命令mvn -v，查看maven的配置。發現runtime:的路徑有些奇怪。
Apache Maven 3.8.3 (ff8e977a158738155dc465c6a97ffaf31982d739)
Maven home: /usr/local/apache-maven-3.8.3
Java version: 1.8.0_311, vendor: Oracle Corporation, runtime: /Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home
Default locale: zh_CN, platform encoding: UTF-8
OS name: "mac os x", version: "10.16", arch: "x86_64", family: "mac"
3. 解決方案
從網上搜索了解決方案，發現這篇文件介紹的比較靠譜。
No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?
采用了文章中的方法3，重新設置JAVA_HOME路徑。
- 添加Java環境變量
# cat ~/.bash_profile
export M2_HOME=/usr/local/apache-maven-3.8.3
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_311.jdk/Contents/Home
export PATH=$PATH:$M2_HOME/bin:$JAVA_HOME/bin
- 使環境變量生效
source ~/.bash_profile
- 查看maven配置
# mvn -v
Apache Maven 3.8.3 (ff8e977a158738155dc465c6a97ffaf31982d739)
Maven home: /usr/local/apache-maven-3.8.3
Java version: 1.8.0_311, vendor: Oracle Corporation, runtime: /Library/Java/JavaVirtualMachines/jdk1.8.0_311.jdk/Contents/Home/jre
Default locale: zh_CN, platform encoding: UTF-8
OS name: "mac os x", version: "10.16", arch: "x86_64", family: "mac"
發現maven的runtime:已經顯示jdk1.8.0_311.jdk，運行環境已經正常。
此時再次執行編譯命令mvn compile，發現Java工程可以正常編譯，不在出現報錯。