Maven uploadArchives命令报错：Could not deploy to remote repository | Failed to deploy artifacts/metadata

Android Studio使用gradle上传aar到maven仓库

uploadArchives {
    repositories {
        mavenDeployer {
            repository(url: NEXUS_REPOSITORY_URL) {
                authentication(userName: getRepositoryUserName(), password: getRepositoryPassword())
            }
            pom.project {
                name POM_NAME
                version POM_VERSION
                artifactId  POM_ARTIFACTID
                groupId  POM_GROUPID
                packaging  POM_PACKAGING
                description  POM_DESCRIPTION
            }
        }
    }
}

执行上传命令
./gradlew xxx:uploadArchives

报错：

Could not deploy to remote repository | Failed to deploy artifacts/metadata: No 
connector available to access repository remote 
('http://localhost:8081/nexus3/repository/maven-releases/')
 of type default using the available factories WagonRepositoryConnectorFactory

一般是仓库地址变量的格式有问题，解决：

1、如果是直接在gradle脚本中使用def定义变量，记得加上引号：

def NEXUS_REPOSITORY_URL='http://localhost:8081/nexus3/repository/maven-releases/'

2、如果是在gradle.properties中定义变量，要去掉引号：

NEXUS_REPOSITORY_URL=http://localhost:8081/nexus3/repository/maven-releases/