原因是多了个插件的原因：

apply plugin: 'org.springframework.boot'

 

但在dockerk要用到该插件的情况。

直接上gradle脚本：

 

//apply plugin: 'org.springframework.boot'

apply plugin: 'io.spring.dependency-management'

 

dependencyManagement {

imports {

mavenBom 'org.springframework.cloud:spring-cloud-dependencies:Hoxton.SR3'

mavenBom 'com.alibaba.cloud:spring-cloud-alibaba-dependencies:2.2.0.RELEASE'

}

}

 

if(project.hasProperty('docker')){

apply plugin: 'org.springframework.boot'

//apply plugin: 'io.spring.dependency-management'

jar {

enabled = true

}

apply plugin: 'docker'

 

 

task buildDocker(type: Docker, dependsOn: bootJar) {

push = false

dockerfile = file('src/main/docker/Dockerfile')

doFirst {

copy {

from jar

into stageDir

}

}

}

}