Gradle 打包成jar，提示找不到主类

Question

打包的gradle文件如下

plugins {
    id 'java'
    id 'org.jetbrains.kotlin.jvm' version '1.3.72'
}

group 'com.dennis'
version '1.0-SNAPSHOT'

repositories {
    mavenLocal()
    mavenCentral()
}

jar {
    from {
        //添加依懒到打包文件
        //configurations.compile.collect { it.isDirectory() ? it : zipTree(it) }
        configurations.runtime.collect { zipTree(it) }
    }
    manifest {
        attributes 'Main-Class': 'com.dennis.tcp.robot.RobotClient'
    }
}

mainClassName = 'com.dennis.tcp.robot.RobotClient'

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
    testCompile group: 'junit', name: 'junit', version: '4.12'
    compile group: 'io.netty', name: 'netty-all', version: '4.1.42.Final'
    compile group: 'org.eclipse.milo', name: 'sdk-client', version: '0.4.1'
    compile group: 'org.eclipse.milo', name: 'sdk-server', version: '0.4.1'
    compile group: 'org.eclipse.milo', name: 'sdk-core', version: '0.4.1'
    compile group: 'org.jetbrains.kotlin', name: 'kotlin-stdlib-jdk8', version: '1.3.72'
    compile group: 'org.jetbrains.kotlin', name: 'kotlin-reflect', version: '1.3.72'
    compile group: 'org.jetbrains.kotlinx', name: 'kotlinx-coroutines-core', version: '1.3.5'
    compile group: 'com.google.code.gson', name: 'gson', version: '2.8.6'
    compile group: 'log4j', name: 'log4j', version: '1.2.17'
    compile group: 'org.slf4j', name: 'slf4j-log4j12', version: '1.7.30'
}

compileKotlin {
    kotlinOptions.jvmTarget = "1.8"
}
compileTestKotlin {
    kotlinOptions.jvmTarget = "1.8"
}

tasks.withType(JavaCompile) {
    options.encoding = "UTF-8"
}

打包的jar包中，有RobotClient这个文件，但是通过java -jar来运行的时候，提示找不到主类。请问这个是怎么回事呢。

Answer 1

https://www.cnblogs.com/LeesinDong/p/12226209.html