change loadbalance

workspace-gateway/src/main/java/com/aliware/tianchi/UserLoadBalance.java

@@ -16,7 +16,6 @@ public class UserLoadBalance implements LoadBalance {
 
     @Override
     public <T> Invoker<T> select(List<Invoker<T>> invokers, URL url, Invocation invocation) throws RpcException {
-        System.out.println("use user loadbalance");
         return invokers.get(ThreadLocalRandom.current().nextInt(invokers.size()));
     }
 }

workspace-provider/src/main/java/com/aliware/tianchi/CallbackServiceImpl.java

 package com.aliware.tianchi;
 
-import org.apache.dubbo.common.extension.SPI;
 import org.apache.dubbo.rpc.listener.CallbackListener;
 import org.apache.dubbo.rpc.service.CallbackService;