Java 11 包在不导出它的模块中声明

Question

我创建了两个模块化程序。一个是 JavaFX 模块化项目，其中包含module-info.java：

module checker {

    requires javafx.fxml;

    requires javafx.controls;

    requires TextInputProgram; // Btw, IDEA shows me here "Ambiguous module reference"

    exports sample;

    opens sample;

}

另一个包含module-info.java如下内容的 Maven 项目：

module TextInputProgram {

    requires selenium.api;

    requires selenium.chrome.driver;

}

因此，我将模块化 Maven 项目作为外部 jar 添加到 JavaFX 中（通过 libs 中的项目结构和通过我指定的 jar 在模块信息中requires）。我还添加了包含用于编译的外部 jar 的变量（除了PATH_TO_FX和PATH_TO_FX_MODS）：

set EXTERNAL_JAR="...\out\artifacts\TextInputProgram_jar"

但是当我试图通过命令编译项目时：

dir /s /b src\*.java > sources.txt & javac --module-path %EXTERNAL_JAR%;%PATH_TO_FX% -d mods/checker @sources.txt & del sources.txt

按照本教程

我从 JavaFX 项目类中得到错误：

\src\sample\Controller.java:9: error: package project is not visible

import project.SeleniumProgram;

       ^

  (package project is declared in module TextInputProgram, which does not export it)

1 error

Package is declared in module which does not export it

import project.SeleniumProgram我在 JavaFX 项目中导入以使用来自外部 jar 的类。

更新：

如果我exports project;在 maven 项目的 module-info.java 中添加，那么我会在 JavaFX module-info.java 中看到错误：

如果我删除，requires TextInputProgram;那么导入时会出现另一个错误

我在这里错过了什么吗？我正在尝试获取这两个程序的可执行 Jar。

Answer 1

正如评论中所讨论的那样，这里可能存在一些问题：模块定义本地 jar 和依赖项基于发布的模块化项目，我将创建一个小型演示多模块化项目来解释这两个问题。Maven 多模块项目使用您的 IDE，创建一个 Maven 项目，然后添加两个模块，TextInputProgram例如checker：父pom<groupId>org.openjfx</groupId><artifactId>hellofx</artifactId><version>1.0-SNAPSHOT</version><modules>&nbsp; &nbsp; <module>TextInputProgram</module>&nbsp; &nbsp; <module>checker</module></modules><packaging>pom</packaging>TextInputProgram pom<parent>&nbsp; &nbsp; <groupId>org.openjfx</groupId>&nbsp; &nbsp; <artifactId>hellofx</artifactId>&nbsp; &nbsp; <version>1.0-SNAPSHOT</version></parent><modelVersion>4.0.0</modelVersion><artifactId>TextInputProgram</artifactId><properties>&nbsp; &nbsp; <maven.compiler.source>11</maven.compiler.source>&nbsp; &nbsp; <maven.compiler.target>11</maven.compiler.target>&nbsp; &nbsp; <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding></properties><dependencies>&nbsp; &nbsp; <dependency>&nbsp; &nbsp; &nbsp; &nbsp; <groupId>org.seleniumhq.selenium</groupId>&nbsp; &nbsp; &nbsp; &nbsp; <artifactId>selenium-java</artifactId>&nbsp; &nbsp; &nbsp; &nbsp; <version>3.141.59</version>&nbsp; &nbsp; </dependency></dependencies><build>&nbsp; &nbsp; <plugins>&nbsp; &nbsp; &nbsp; &nbsp; <plugin>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <groupId>org.apache.maven.plugins</groupId>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <artifactId>maven-compiler-plugin</artifactId>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <version>3.8.1</version>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <configuration>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <release>11</release>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </configuration>&nbsp; &nbsp; &nbsp; &nbsp; </plugin>&nbsp; &nbsp; </plugins></build>Module-info.javamodule TextInputProgram {&nbsp; &nbsp; requires selenium.api;&nbsp; &nbsp; requires selenium.chrome.driver;&nbsp; &nbsp; exports project to checker;}检查 pom<parent>&nbsp; &nbsp; <artifactId>testMods</artifactId>&nbsp; &nbsp; <groupId>org.openjfx</groupId>&nbsp; &nbsp; <version>1.0-SNAPSHOT</version></parent><modelVersion>4.0.0</modelVersion><artifactId>checker</artifactId><dependencies>&nbsp; &nbsp; <dependency>&nbsp; &nbsp; &nbsp; &nbsp; <groupId>org.openjfx</groupId>&nbsp; &nbsp; &nbsp; &nbsp; <artifactId>javafx-controls</artifactId>&nbsp; &nbsp; &nbsp; &nbsp; <version>12.0.2</version>&nbsp; &nbsp; </dependency>&nbsp; &nbsp; <dependency>&nbsp; &nbsp; &nbsp; &nbsp; <groupId>org.openjfx</groupId>&nbsp; &nbsp; &nbsp; &nbsp; <artifactId>javafx-fxml</artifactId>&nbsp; &nbsp; &nbsp; &nbsp; <version>12.0.2</version>&nbsp; &nbsp; </dependency>&nbsp; &nbsp; <dependency>&nbsp; &nbsp; &nbsp; &nbsp; <groupId>org.openjfx</groupId>&nbsp; &nbsp; &nbsp; &nbsp; <artifactId>TextInputProgram</artifactId>&nbsp; &nbsp; &nbsp; &nbsp; <version>1.0-SNAPSHOT</version>&nbsp; &nbsp; </dependency></dependencies><build>&nbsp; &nbsp; <plugins>&nbsp; &nbsp; &nbsp; &nbsp; <plugin>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <groupId>org.apache.maven.plugins</groupId>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <artifactId>maven-compiler-plugin</artifactId>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <version>3.8.1</version>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <configuration>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <release>11</release>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </configuration>&nbsp; &nbsp; &nbsp; &nbsp; </plugin>&nbsp; &nbsp; &nbsp; &nbsp; <plugin>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <groupId>org.openjfx</groupId>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <artifactId>javafx-maven-plugin</artifactId>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <version>0.0.3</version>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <configuration>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <mainClass>sample.Main</mainClass>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </configuration>&nbsp; &nbsp; &nbsp; &nbsp; </plugin>&nbsp; &nbsp; </plugins></build>Module-info.javamodule checker {&nbsp; &nbsp; requires javafx.fxml;&nbsp; &nbsp; requires javafx.controls;&nbsp; &nbsp; requires TextInputProgram;&nbsp; &nbsp; opens sample to javafx.fxml;&nbsp; &nbsp; exports sample;}（此时两个模块的代码无关紧要）。包括解决方案现在请注意，您必须将其添加到TextInputProgram模块描述符中：exports project to checker;如果你想让checker模块访问的TextInputProgram包project。这将解决此错误：包项目在模块 TextInputProgram 中声明，不导出它另请注意，我已将此依赖项包含在checker项目中：<dependency>&nbsp; &nbsp; <groupId>org.openjfx</groupId>&nbsp; &nbsp; <artifactId>TextInputProgram</artifactId>&nbsp; &nbsp; <version>1.0-SNAPSHOT</version></dependency>即使有两个模块，在同一个父模块下，您也需要包含一个模块到另一个模块的依赖关系。否则这将失败（找不到模块）：requires TextInputProgram;mvn clean install您可以在模块中运行TextInputProgram，以安装org.openjfx:TextInputProgram:1.0-SNAPSHOT在您的本地存储库中.m2。然后您可以运行mvn clean javafx:runintchecker module来运行 GUI 项目。值得一提的是，将两个 maven 依赖项与 jar 文件结合起来并不是一个好主意。如果您最终同时使用两者，您将收到此错误：模块“检查器”从“TextInputProgram”和“TextInputProgram”中读取“项目”此消息意味着模块路径中有两个模块具有完全相同的名称，一个是 maven 依赖项，另一个是 jar 工件。为了分发您的项目和模块，最好使用 maven 方法，并避免在 lib 文件夹中包含 jar 文件。稍后你的模块将作为单独的工件发布，你不需要修改你的 pom 文件（除了更新版本号）。