小编arg*_*ist的帖子

我试图从互联网安装一个原型,需要执行mvn maven-dependency-plugin:2.8:copy.由于错误重新发布版本,它无法正常工作.我在本地也有一个正确的版本存储库到我的服务器.我的mvn捆绑到我的服务器上的nexus.

怎么了？

错误信息:

mvn -e maven-dependency-plugin:2.8:copy
[INFO] Error stacktraces are turned on.
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.131s
[INFO] Finished at: Wed Jul 24 11:15:01 CEST 2013
[INFO] Final Memory: 5M/149M
[INFO] ------------------------------------------------------------------------
[ERROR] Error resolving version for plugin 'maven-dependency-plugin:2.8' from the repositories [local (/home/argonist/.m2/repository), nexus (http://10.8.1.1:8081/nexus/content/groups/public)]: Plugin not found in any plugin repository -> [Help 1]
org.apache.maven.plugin.version.PluginVersionResolutionException: Error resolving version for plugin 'maven-dependency-plugin:2.8' from the repositories [local (/home/argonist/.m2/repository), nexus …

如何将子类转换为具有相同超类的另一个子类？我知道它不允许直接从子类转换为子类.另一种方式？ID被设置为超类,因此制作新对象并不好; 我用它来表示状态模式.如果状态改变,那么类的类型应该改变.

@Entity
public class Request() {}

@Entity
public class OpenRequest extends Request() {}

@Entity 
public class CloseRequest extends Request() {}

谢谢