我用Maven编写了Java 9 模块化应用程序，现在我想添加测试用例。
当我尝试在整个项目上运行mvn clean install命令时，出现了以下错误：
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.6.1:testCompile (default-testCompile) on project EmployeeModule: Fatal error compiling: invalid flag: -Xmodule:EmployeeModule -> [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/MojoExecutionException
[ERROR]
[ERROR] After correcting the problems, you can resume the build with the command
[ERROR] mvn <goals> -rf :EmployeeModule
奇怪的是，我可以在Intellij中运行这个项目而没有警告或错误，我也可以在此模块中运行测试而没有错误。
我正在使用来自Oracle网站的Java 9和Maven 3.5.0。 抱歉，我无法用java9标记它。