一、问题发生背景

android studio是Arctic Fox版本，gradle 插件版本是7.2，JDK11。创建groovy model 实现 javassist 时，groovy model的 build.gradle 如下：

apply plugin: 'groovy'
apply plugin: 'maven'


repositories {
    mavenCentral()
}

uploadArchives{
//    打包成一个jar    引用jar  生成这个三个信息
    repositories.mavenDeployer {
        pom.groupId = 'com.javassist'
        pom.artifactId = 'modify'
        pom.version = '1.0.0'
        repository(url: uri('../repo'))
    }
}

dependencies {
    //gradle sdk
    compile gradleApi()
    //groovy sdk
    compile localGroovy()
    compile 'org.javassist:javassist:3.20.0-GA'
}

结果报错：

Caused by: org.gradle.api.plugins.UnknownPluginException: Plugin with id 'maven' not found.

二、分析解决

Gradle 7版本将maven插件移除了，用maven publish插件替代。

解决如下：

plugins {
    id 'groovy'
    id 'maven-publish' 
}

publishing {
    publications {
        publish2Local(MavenPublication) {
            groupId = 'com.javassist'
            artifactId = 'modify'
            version = '1.0.0'
            from components.java
        }
    }

    repositories {
        maven {
            url = "$buildDir/repo"
        }
    }
}

dependencies {
    //gradle sdk
    implementation gradleApi()
    //groovy sdk
    implementation localGroovy()
    implementation 'org.javassist:javassist:3.20.0-GA'
}

如果报 ‘Gradle Libs’ was added by unknown code：

Build was configured to prefer settings repositories over project repositories 
but repository ‘Gradle Libs’ was added by unknown code

解决方法
问题的原因就是Gradle希望开发者将所有仓库配置都在这里设置，而不是根据每个项目自己去导入
settings.gradle中，修改或去除repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)

dependencyResolutionManagement {
//    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
    repositoriesMode.set(RepositoriesMode.PREFER_PROJECT)
    repositories {
        google()
        mavenCentral()
    }
}