[xuxueli/xxl-job]注册时，客户端一直报错，提示注册失败，调试时，发现进不去admin中的 JobApiController.api 方法

xxl-job-1.9.1

启动 admin, 然后启动执行器事例 springboot, 发现springboot一直报错，后换启动spring也是

admin 端：

2018-07-25 16:12:02 xxl-job-admin [org.springframework.web.servlet.PageNotFound]-[http-nio-8080-exec-4]-[noHandlerFound]-[1176]-[WARN] No mapping found for HTTP request with URI [/xxl-job-admin/api] in DispatcherServlet with name 'springmvc'
2018-07-25 16:12:02 xxl-job-admin [org.springframework.web.servlet.PageNotFound]-[http-nio-8080-exec-4]-[handleHttpRequestMethodNotSupported]-[215]-[WARN] Request method 'POST' not supported

springboot端报错信息：

16:11:32.568 logback [Thread-11] INFO  c.x.j.c.t.ExecutorRegistryThread - >>>>>>>>>>> xxl-job registry error, registryParam:RegistryParam{registGroup='EXECUTOR', registryKey='xxl-job-executor-sample', registryValue='localhost:9998'}
java.lang.RuntimeException: RpcResponse byte[] is null
    at com.xxl.job.core.rpc.netcom.NetComClientProxy$1.invoke(NetComClientProxy.java:65)
    at com.sun.proxy.$Proxy54.registry(Unknown Source)
    at com.xxl.job.core.thread.ExecutorRegistryThread$1.run(ExecutorRegistryThread.java:57)
    at java.lang.Thread.run(Thread.java:745)