Kotlin + Maven组装:无主要清单属性 [英] Kotlin + Maven assembling: no main manifest attribute

问题描述

我在使用Maven将Kotlin项目与JAR文件具有某些依赖项组装时遇到问题.

我如何将项目组装到JAR:

How am i assembling project to JAR:

RightPanel -> MavenProjects -> Lifecycle -> package -> run

当我运行JAR文件时:

When i running JAR file:

java -jar path.jar

我遇到以下错误:

no main manifest attribute, in path.jar

我在此处中添加了maven-assembly-plugin

所以我的插件目录如下:

<build>
    <sourceDirectory>src/main/kotlin</sourceDirectory>
    <testSourceDirectory>src/test/kotlin</testSourceDirectory>

    <plugins>

        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-assembly-plugin</artifactId>
            <version>2.6</version>
            <executions>
                <execution>
                    <id>make-assembly</id>
                    <phase>package</phase>
                    <goals> <goal>single</goal> </goals>
                    <configuration>
                        <archive>
                            <manifest>
                                <mainClass>${main.class}</mainClass>
                            </manifest>
                        </archive>
                        <descriptorRefs>
                            <descriptorRef>jar-with-dependencies</descriptorRef>
                        </descriptorRefs>
                    </configuration>
                </execution>
            </executions>
        </plugin>

        <plugin>
            <groupId>org.jetbrains.kotlin</groupId>
            <artifactId>kotlin-maven-plugin</artifactId>
            <version>${kotlin.version}</version>
            <executions>
                <execution>
                    <id>compile</id>
                    <phase>compile</phase>
                    <goals>
                        <goal>compile</goal>
                    </goals>
                </execution>
                <execution>
                    <id>test-compile</id>
                    <phase>test-compile</phase>
                    <goals>
                        <goal>test-compile</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>

main.class属性在此处定义:

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <kotlin.version>1.1.51</kotlin.version>
    <junit.version>4.12</junit.version>
    <main.class>ru.icarumbas.main.HelloKt</main.class>
</properties>

一些事实:

• Hello.kt是入门类，它很有趣main(...){}
• 当我取消归档JAR时，它具有META-INF文件夹.

• Hello.kt is starter class and it has fun main(...){}
• When i unarchive JAR it has META-INF folder.

版本:

• 平台:Mac OS
• 科特林版本:1.1.51
• Maven版本:4.0.0

也许我想念一些东西.我已经看过很多类似的问题，但它们并没有帮助我.因此，如果您想查看更多代码，请不要将其标记为重复并写评论.我没有显示完整的pom.xml文件，因此，如果您想查看完整的文件，请写信给我.

Maybe i'm missing something. I've already looked on a lot of questions alike this, and they didn't help me. So please don't mark this as duplicate and write a comment if you want to see more code. I didn't show my full pom.xml file so write me if you want to see it full.

推荐答案

我在Kotlin和Maven中遇到了此类问题. 我已经通过以下方式(Application.kt)解决了它:

I've got such problems with kotlin and maven. I've solved it in following way (Application.kt):

package org.somepackage

open class Application {
    companion object {
        @JvmStatic fun main(args: Array<String>) {
            // something..
        }
    }
}

-所以首先我写了一个kotlin类，里面有main.

-- So first i've written the kotlin class with main inside it.

其次，按照您的情况，通过以下方式<main.class>org.somepackage.Application</main.class>

Secondly as in your case defined the main class in props in a following way <main.class>org.somepackage.Application</main.class>

在执行mvn clean install命令后，我得到了必要的someapp-1.0-SNAPSHOT-jar-with-dependencies.jar可以正常工作.

After mvn clean install command finished i've got the necessary someapp-1.0-SNAPSHOT-jar-with-dependencies.jar which was able to work.

最后请注意，您运行的正是jar-with-dependencies.jar(不是像app-1.0-SNAPSHOT.jar这样的剥离版本).

And at the end please pay attention that you run exactly jar-with-dependencies.jar (not a stripped version like a app-1.0-SNAPSHOT.jar).

这篇关于Kotlin + Maven组装:无主要清单属性的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！