在Java9中将孵化器Http类与Maven结合使用 [英] Using Incubator Http Classes with Maven in Java9

问题描述

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

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

使用Maven构建项目时，出现以下错误

When building my project with maven I get the following error

[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

Foo的第4行是

import jdk.incubator.http.HttpClient;

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>

对不起，如果您认为此解决方法有遗忘之处，那么我对maven不太满意，并且以前从未处理过孵化器类.我已经搜索了错误，但没有找到任何有用的信息.感谢您的帮助.

Sorry, if you think this has an oblivious fix, I am not very good with maven and never have had to deal with the incubator classes before. I have searched for the error but haven't found anything useful. Thanks for the help.

推荐答案

在创建模块时，您需要在包的最顶层创建一个module-info.java类，该类之后应包含

While creating a module, you need to create a module-info.java class at the topmost level of your packages which shall thereafter include

module yourModule {
    requires jdk.incubator.httpclient;
}

确保模块jdk.incubator.httpclient导出的软件包jdk.incubator.http对您的模块可见.

ensuring that the package jdk.incubator.http exported by the module jdk.incubator.httpclient is visible to your module.

或者，要创建常规的类路径应用程序，您可以

Alternatively, to create a regular classpath application, you can

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

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