为什么Maven看不到JavaFX图形模块（而Eclipse看不到）

我有一个多模块Maven项目，其中一个模块使用JavaFX。虽然在Eclipse中一切都编译得很好，但是

mvn干净编译

[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] /C:/Users/egr/eclipse-workspace/demo/mod1/src/main/java/nl/eddy/mod1/Launch.java:[4,26] package javafx.scene.robot does not exist
[ERROR] /C:/Users/egr/eclipse-workspace/demo/mod1/src/main/java/nl/eddy/mod1/Launch.java:[15,21] cannot find symbol
  symbol:   class Robot
  location: class nl.eddy.mod1.Launch
[INFO] 2 errors
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary for demo 0.0.1-SNAPSHOT:
[INFO]
[INFO] demo ............................................... SUCCESS [  0.368 s]
[INFO] mod1 ............................................... FAILURE [  2.541 s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  3.161 s
[INFO] Finished at: 2020-02-11T13:08:56+01:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.0:compile (default-compile) on project mod1: Compilation failure: Compilation failure:
[ERROR] /C:/Users/egr/eclipse-workspace/demo/mod1/src/main/java/nl/eddy/mod1/Launch.java:[4,26] package javafx.scene.robot does not exist
[ERROR] /C:/Users/egr/eclipse-workspace/demo/mod1/src/main/java/nl/eddy/mod1/Launch.java:[15,21] cannot find symbol
[ERROR]   symbol:   class Robot
[ERROR]   location: class nl.eddy.mod1.Launch
[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.

返回此错误

package javafx.scene.robot does not exist

maven似乎看不到包含

javafx.scene.robot

的

javafx.graphics

模块（但Eclipse确实看到了它，因为它没有给出编译错误）。如何让Maven编译这段代码

我已经创建了我的应用程序的一个小版本来复制这个。以下是文件：

Main pom.xml

<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>nl.eddy</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>pom</packaging>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.0</version>
                <configuration>
                    <release>11</release>   <!-- JDK Version -->
                </configuration>
            </plugin>
        </plugins>
    </build>

    <modules>
        <module>mod1</module>
    </modules>
</project>

module-info.java

module nl.eddy.mod1 {

    requires javafx.controls;
//  requires javafx.graphics; uncommenting this does not change maven's message
}

mvn干净编译的输出

[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] /C:/Users/egr/eclipse-workspace/demo/mod1/src/main/java/nl/eddy/mod1/Launch.java:[4,26] package javafx.scene.robot does not exist
[ERROR] /C:/Users/egr/eclipse-workspace/demo/mod1/src/main/java/nl/eddy/mod1/Launch.java:[15,21] cannot find symbol
  symbol:   class Robot
  location: class nl.eddy.mod1.Launch
[INFO] 2 errors
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary for demo 0.0.1-SNAPSHOT:
[INFO]
[INFO] demo ............................................... SUCCESS [  0.368 s]
[INFO] mod1 ............................................... FAILURE [  2.541 s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  3.161 s
[INFO] Finished at: 2020-02-11T13:08:56+01:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.0:compile (default-compile) on project mod1: Compilation failure: Compilation failure:
[ERROR] /C:/Users/egr/eclipse-workspace/demo/mod1/src/main/java/nl/eddy/mod1/Launch.java:[4,26] package javafx.scene.robot does not exist
[ERROR] /C:/Users/egr/eclipse-workspace/demo/mod1/src/main/java/nl/eddy/mod1/Launch.java:[15,21] cannot find symbol
[ERROR]   symbol:   class Robot
[ERROR]   location: class nl.eddy.mod1.Launch
[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.

来自

mvn-X compile的日志的编译器详细信息

Apache Maven 3.6.0 (97c98ec64a1fdfee7767ce5ffb20918da4f719f3; 2018-10-24T20:41:47+02:00)
Maven home: C:\apps\apache-maven-3.6.0\bin\..
Java version: 12.0.2, vendor: Oracle Corporation, runtime: C:\Program Files\Java\jdk-12.0.2
Default locale: en_US, platform encoding: Cp1252
OS name: "windows server 2012 r2", version: "6.3", arch: "amd64", family: "windows"

当我将maven编译器插件发布元素的值改为12而不是11时，编译就进行得很顺利。即，与实际运行Maven的编译器的值相同。非常感谢@JosePereda，请参阅注释。
编译时使用的JDK是什么？（运行
mvn-X compile
找出答案）@JoséPereda我已经在上面的帖子中添加了
mvn-X compile
输出的开头。我无法重现你的问题。确保
%PATH%
中没有任何其他JDK，因为Maven会选择它。您还可以尝试添加到编译器插件配置中：
/path/to/javactrue
，其中路径指向JDK 12.0.2above@JoséPereda感谢您为我指出编译器插件配置。我只是把版本改成了12，是11。
Apache Maven 3.6.0 (97c98ec64a1fdfee7767ce5ffb20918da4f719f3; 2018-10-24T20:41:47+02:00)
Maven home: C:\apps\apache-maven-3.6.0\bin\..
Java version: 12.0.2, vendor: Oracle Corporation, runtime: C:\Program Files\Java\jdk-12.0.2
Default locale: en_US, platform encoding: Cp1252
OS name: "windows server 2012 r2", version: "6.3", arch: "amd64", family: "windows"