当用maven build项目时出现了如下错误：

Failed to execute goal com.spotify:docker-maven-plugin:0.4.13:build (default-cli) on project config: Exception caught: java.util.concurrent.ExecutionException: com.spotify.docker.client.shaded.javax.ws.rs.ProcessingException: org.apache.http.conn.HttpHostConnectException: Connect to localhost:2375 [localhost/127.0.0.1, localhost/0:0:0:0:0:0:0:1] failed: Connection refused

多方查找资料，最后发现，原来是自己的docker没装，也是醉了。

所以以后大家也出现了这种错误，原因可能：

1.没安装docker

2.如果安装了docker的话，可能docker的daemon没有运行

解决办法：

1.安装docker，docker官网有详细步骤

2.开启docker的守护进程，在linux上,运行

 systemctl start docker.service

再查资料的过程中找到与我类似的错误的一篇博客：http://blog.csdn.net/chinamcafee/article/details/66974686

其报错是：

Failed to execute goal com.spotify:docker-maven-plugin:0.2.9:build (default-cli) on project config: Exception caught: java.util.concurrent.ExecutionException: com.spotify.docker.client.shaded.javax.ws.rs.ProcessingException: org.apache.http.conn.HttpHostConnectException: Connect to localhost:2375 [localhost/127.0.0.1, localhost/0:0:0:0:0:0:0:1] failed: Connection refused

解决办法：

把docker-maven-plugin版本更新成0.4.13即可