无法执行jar文件：mainclass属性缺少Intellij Gradle

Question

Manifest-Version: 1.0
Bundle-Description: Servlet Specification API
Bundle-License: http://www.apache.org/licenses/LICENSE-2.0
Bundle-SymbolicName: org.mortbay.jetty.servlet-api
Archiver-Version: Plexus Archiver
Built-By: janb
Bundle-RequiredExecutionEnvironment: J2SE-1.4
Bnd-LastModified: 1229016831353
Bundle-ManifestVersion: 2
Bundle-DocURL: http://www.mortbay.com
Bundle-Vendor: Mort Bay Consulting
Tool: Bnd-0.0.238
Implementation-Vendor: JCP
Originally-Created-By: 1.5.0_13 (Sun Microsystems Inc.)
Export-Package: javax.servlet.http;uses:="javax.servlet";version="2.5"
 ,javax.servlet;version="2.5",javax.servlet.resources;version="2.5",ja
 vax.servlet.jsp.resources;version="2.5"
Bundle-Version: 2.5
Bundle-Name: Servlet Specification API
Ignore-Package: javax.servlet.http,javax.servlet,javax.servlet.resourc
 es,javax.servlet.jsp.resources
Created-By: 1.5.0_13 (Sun Microsystems Inc.)
Build-Jdk: 1.5.0_13
Specification-Version: 2.5

Manifest-Version: 1.0
Main-Class: MainFrame

group 'tasks'
version '1.0-SNAPSHOT'

apply plugin: 'java'
apply plugin: 'application'

mainClassName = 'MainFrame'
sourceCompatibility = 1.8
targetCompatibility = 1.8
version = '1.0'

jar {
    manifest {
        attributes 'Implementation-Title': 'Gradle Quickstart',
                'Implementation-Version': version,
                'Main-Class': 'MainFrame'
    }
}

我也看了几个Youtube视频，但似乎没有一个能解决这个问题。

为什么mainclass-属性没有正确地嵌入到jar的清单中，如何修复它？

Answer 1

我也有同样的问题，我正在用Intellij编码。在我的年级上，我写了下面的代码

    buildscript {
    ext {
        springBootVersion = '2.1.6.RELEASE'
    }
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath("org.springframework.boot:spring-boot-gradle-plugin:$springBootVersion")
    }
}

apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'idea'
apply plugin: 'org.springframework.boot'
apply plugin: 'io.spring.dependency-management'


bootJar {
    baseName = 'yournameforyourjar'
    version =  '0.1.0'
}

jar {
    manifest {
        attributes(
                'Main-Class': 'yourpackagename.Application'
        )
    }
}


repositories {
    mavenCentral()
}

sourceCompatibility = 1.8
targetCompatibility = 1.8

dependencies {

    compile group: 'org.springframework.boot', name: 'spring-boot', version: '2.1.6.RELEASE'
    implementation("org.springframework.boot:spring-boot-starter-web")

   //the rest of you dependencies add here


}

之后，我可以通过IDE上运行以下命令的终端生成.jar指令：

gradlew clean build

生成的.jar可以在项目文件夹中的build/libs目录中找到