maven项目bulid失败_No compiler is provided in this environment.

错误信息如下：

[ERROR] No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?
[INFO] 1 error
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.103 s
[INFO] Finished at: 2019-08-26T17:41:36+08:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (default-compile) on project springmvc: Compilation failure
[ERROR] No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException

前提：maven项目，tomcat 7，jdk1.8

根据错误信息提示：No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?这个环境中没有提供编译器。也许您运行的是JRE而不是JDK?

1：首先查看 Eclipse-->Window-->preferences-->Java-->Installed JREs

果然安装的是jre，而maven项目的运行需要一个和在setting.xml或者pom.xml指定的版本的jdk

我的是在setting.xml配置的jdk，版本是1.8，配置如下：

<profile>
    <id>jdk-1.8</id>
     <activation>
        <activeByDefault>true</activeByDefault>
        <jdk>1.8</jdk>
      </activation>
    <properties>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <maven.compiler.compilerVersion>1.8</maven.compiler.compilerVersion>
    </properties>
</profile>

所以我们要配置一个指定版本的jdk，然后选中该jdk目录,同时为了防止出错，我把jre目录删除掉了

2：项目右键-->build path-->configure build path-->java Build Path-->接着图片操作




3.如果你是在pom.xml设置的jdk，那你还需要：项目右键-->run as -->run configurations..--> jre -->execution environment选择刚刚配置的jdk-->run

update project 重新编译运行即可！