Java Gradle生成中缺少mainClassName属性的Gradle错误
我有两个子项目的graddle配置,当我想要构建项目时,会抛出以下错误:Java Gradle生成中缺少mainClassName属性的Gradle错误,java,gradle,Java,Gradle,我有两个子项目的graddle配置,当我想要构建项目时,会抛出以下错误: Executing external task 'build'... :core:compileJava :core:processResources UP-TO-DATE :core:classes :core:jar :core:startScripts FAILED FAILURE: Build failed with an exception. * What went wrong: A problem was
Executing external task 'build'...
:core:compileJava
:core:processResources UP-TO-DATE
:core:classes
:core:jar
:core:startScripts FAILED
FAILURE: Build failed with an exception.
* What went wrong:
A problem was found with the configuration of task ':core:startScripts'.
> No value has been specified for property 'mainClassName'.
我的配置:
ROOT-build.gradle:
subprojects {
apply plugin: 'java'
apply plugin: 'application'
group = 'pl.morecraft.dev.morepianer'
repositories {
mavenLocal()
mavenCentral()
}
run {
main = project.getProperty('mainClassName')
}
jar {
manifest {
attributes 'Implementation-Title': project.getProperty('name'),
'Implementation-Version': project.getProperty('version'),
'Main-Class': project.getProperty('mainClassName')
}
}
}
task copyJars(type: Copy, dependsOn: subprojects.jar) {
from(subprojects.jar)
into project.file('/jars')
}
dependencies {
compile 'com.google.dagger:dagger:2.4'
compile 'com.google.dagger:dagger-compiler:2.4'
}
ROOT-setting.gradle:
include 'app'
include 'core'
应用程序项目-build.gradle:
subprojects {
apply plugin: 'java'
apply plugin: 'application'
group = 'pl.morecraft.dev.morepianer'
repositories {
mavenLocal()
mavenCentral()
}
run {
main = project.getProperty('mainClassName')
}
jar {
manifest {
attributes 'Implementation-Title': project.getProperty('name'),
'Implementation-Version': project.getProperty('version'),
'Main-Class': project.getProperty('mainClassName')
}
}
}
task copyJars(type: Copy, dependsOn: subprojects.jar) {
from(subprojects.jar)
into project.file('/jars')
}
dependencies {
compile 'com.google.dagger:dagger:2.4'
compile 'com.google.dagger:dagger-compiler:2.4'
}
EMPTY
核心项目-build.gradle:
subprojects {
apply plugin: 'java'
apply plugin: 'application'
group = 'pl.morecraft.dev.morepianer'
repositories {
mavenLocal()
mavenCentral()
}
run {
main = project.getProperty('mainClassName')
}
jar {
manifest {
attributes 'Implementation-Title': project.getProperty('name'),
'Implementation-Version': project.getProperty('version'),
'Main-Class': project.getProperty('mainClassName')
}
}
}
task copyJars(type: Copy, dependsOn: subprojects.jar) {
from(subprojects.jar)
into project.file('/jars')
}
dependencies {
compile 'com.google.dagger:dagger:2.4'
compile 'com.google.dagger:dagger-compiler:2.4'
}
和两个子项目(类似)-gradle.properties:
version = 0.1-SNAPSHOT
name = MorePianer Core Lib
mainClassName = pl.morecraft.dev.morepianer.core.Core
#ogr.gradle.configurationdemand = true
我尝试在许多地方添加mainClassName属性,但它不起作用。更奇怪的是,它在几天前就开始工作了。我第一次使用gradle,我正在考虑切换回maven。应用程序插件需要知道绑定应用程序时的主类 在您的例子中,您为每个子项目应用
应用程序
插件,而不为每个子项目指定主类
我遇到了同样的问题,并通过在与apply plugin:'application'
相同的级别上指定“mainClassName”来修复它:
apply plugin: 'application'
mainClassName = 'com.something.MyMainClass'
如果您想在
gradle.properties
文件中指定它,您可能必须将其编写为:projectName.mainClassName=..
而不是设置mainClassName,尝试创建
task run(type: JavaExec, dependsOn: classes) {
main = 'com.something.MyMainClass'
classpath = sourceSets.main.runtimeClasspath
}
请看我在项目中遇到了同样的问题,并通过排除gradle.properties解决了这个问题:
version = 0.1-SNAPSHOT
name = MorePianer Core Lib
mainClassName = pl.morecraft.dev.morepianer.core.Core
#ogr.gradle.configurationdemand = true
每当我们将gradle脚本与应用程序插件绑定时,gradle都希望我们指出应用程序的起点。这是必要的,因为Gradle将开始使用给定位置作为入口点绑定您的应用程序(jar/zip)。
抛出此错误的原因很简单,Gradle知道您要绑定应用程序,但不知道从何处开始绑定过程 可以将
mainClassName
指定为项目扩展属性:
ext {
mainClassName = 'com.something.MyMainClass'
}
我曾尝试在属性中添加:
apply plugin:'application'mainClassName='pl.morecraft.dev.morepianer.core.core'
或projectName.mainClassName
,但不幸的是没有任何帮助:/n您是否尝试将行mainClassName放在构建文件而不是属性文件中?对于Kotlin DSL,当在plugins{application/*…*/}
中指定application
插件时,还要将其配置为:application{mainClassName=“com.something.MyMainClass”}
我刚刚从build.gradle
中删除了这一行(我正在使用IntelliJ)mainClassName='MyProjectName'
谢谢!这在gradle版本4.4和SpringBoot 1.4.0中起到了作用,但我不能使用“run”这个名称,所以我使用了“customRun”。使用“运行”:“无法添加任务“运行”,因为具有该名称的任务已存在。”