java 编译无效标志的致命错误 --module-path
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/46118716/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
fatal error compiling invalid flag --module-path
提问by lapots
I have a project. Originally it was a single module project with structure like this
我有一个项目。原本是一个单模块项目，结构是这样的
java-cloud-sample\
src\
main\
java
pom.xml
I decided to make it into a multi-module structure - I use java 9anyway.
So I separated it like this
我决定把它做成一个多模块结构——我java 9无论如何都用。所以我是这样分开的
java-cloud-sample\
java-cloud-rest-api\
src\
pom.xml
pom.xml
Where root pom.xmllooks like this
根pom.xml看起来像这样
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.lapots.breed.platform.cloud</groupId>
<artifactId>java-cloud-sample</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>pom</packaging>
<modules>
<module>java-cloud-rest-api</module>
</modules>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.6.RELEASE</version>
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<maven.compiler.source>1.9</maven.compiler.source>
<maven.compiler.target>1.9</maven.compiler.target>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.6.2</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>3.0.0</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<version>3.0.1</version>
<executions>
<execution>
<id>copy-dependencies</id>
<phase>package</phase>
<goals><goal>copy-dependencies</goal></goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
And module pom.xmllooks like this
模块pom.xml看起来像这样
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>com.lapots.breed.platform.cloud</groupId>
<artifactId>java-cloud-sample</artifactId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<artifactId>java-cloud-rest-api</artifactId>
<description>Demo project for Spring Boot</description>
<packaging>jar</packaging>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<executions>
<execution>
<goals>
<goal>build-info</goal>
</goals>
<configuration>
<additionalProperties>
<encoding.source>${project.build.sourceEncoding}</encoding.source>
<encoding.reporting>${project.reporting.outputEncoding}</encoding.reporting>
<java.source>${maven.compiler.source}</java.source>
<java.target>${maven.compiler.target}</java.target>
</additionalProperties>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
But when I try to run mvn clean packageI get
但是当我尝试跑步时，mvn clean package我得到了
INFO] java-cloud-rest-api ................................ FAILURE [ 1.060 s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.104 s
[INFO] Finished at: 2017-09-08T17:15:46+03:00
[INFO] Final Memory: 27M/331M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.6.2:compile (default-compile) on project java-cloud-rest-api: Fatal error compiling: invalid flag: --module-path -> [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 :java-cloud-rest-api
What is the problem? (maybe I should split mavenproject into separate modules and each maven module split into javamodules)
问题是什么？（也许我应该将maven项目拆分为单独的模块，并将每个 Maven 模块拆分为java模块）
回答by Naman
This failure occurs when maveninstalled on your machine is configured with java8as the default java version. You can confirm this by executing
当您机器上安装的maven配置为java8作为默认 java 版本时，会发生此故障。您可以通过执行来确认这一点
mvn -version
on your terminal and checking the Java versionstated in the configuration.
在您的终端上并检查配置中所述的Java 版本。
To resolve the version to a newer and supported version like java9at the moment, you can create/edit the mavenrc(on MacOS) file on your machine:
目前要将版本解析为更新且受支持的版本，例如java9，您可以mavenrc在您的机器上创建/编辑（在 MacOS 上）文件：
vi ~/.mavenrc
to include these
包括这些
export PATH
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk-9.jdk/Contents/Home/
export PATH=${PATH}:$JAVA_HOME/bin
Once you save this configuration, you can confirm maven should be using Java version 9 using the same command and then your project shall build without the stated error.
一旦您保存此配置，可以确认Maven的应该使用Java版本9使用相同的命令，然后你的项目必须经规定的误差建设。
