在Java9中使用带有Maven的孵化器Http类

Question

我在用什么

Java 9 + Maven + HttpClient(来自java 9) jdk.incubator.http.HttpClient

问题

使用maven构建项目时出现以下错误

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.7.0:compile (default-compile) on project Core: Compilation failure: Compilation failure:
[ERROR] Foo.java:[4,21] package jdk.incubator.http is not visible

第4行Foo是

import jdk.incubator.http.HttpClient;

的pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0">
<modelVersion>4.0.0</modelVersion>
<parent>
    <groupId>me.bar</groupId>
    <artifactId>foo</artifactId>
    <version>0.0.0-SNAPSHOT</version>
</parent>

<artifactId>Core</artifactId>

<build>
    <finalName>${project.artifactId}</finalName>
    <sourceDirectory>${project.basedir}/src</sourceDirectory>


    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-clean-plugin</artifactId>
            <version>3.0.0</version>
        </plugin>

        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.7.0</version>
            <configuration>
                <source>9</source>
                <target>9</target>
            </configuration>
        </plugin>

        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-shade-plugin</artifactId>
            <version>3.1.0</version>
            <executions>
                <execution>
                    <phase>package</phase>
                    <goals>
                        <goal>shade</goal>
                    </goals>
                    <configuration>
                        <minimizeJar>true</minimizeJar>
                    </configuration>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>

注意

对不起,如果你认为这有一个不经意的修复,我对maven不太好,从来没有必须处理孵化器课程.我搜索了错误,但没有找到任何有用的东西.谢谢您的帮助.

Answer 1

在创建模块时,您需要module-info.java在包的最顶层创建一个类,此后将包含该类

module yourModule {
    requires jdk.incubator.httpclient;
}

确保jdk.incubator.http模块导出的包对模块jdk.incubator.httpclient可见.

或者,要创建常规类路径应用程序,您可以

编译使用: -

<plugin>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>3.7.0</version>
    <configuration>
        <source>9</source>
        <target>9</target>
        <compilerArgs>
            <arg>--add-modules</arg>
            <arg>jdk.incubator.httpclient</arg>
        </compilerArgs>
    </configuration>
</plugin>

运行使用: -

java -jar --add-modules=jdk.incubator.httpclient yourJar.jar