diff --git a/ProxyIpPool b/ProxyIpPool
deleted file mode 160000
index e3f8bd7..0000000
--- a/ProxyIpPool
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit e3f8bd78ffd882dc85e91eaf249e97ae9cbb8d12
diff --git a/src/main/java/com/myapp/main/MaintenanceService.java b/src/main/java/com/myapp/main/MaintenanceService.java
index 11f985e..750c9f5 100644
--- a/src/main/java/com/myapp/main/MaintenanceService.java
+++ b/src/main/java/com/myapp/main/MaintenanceService.java
@@ -3,11 +3,13 @@
 import com.myapp.client.CrawlClient;
 import com.myapp.proxy.HttpProxy;
 import com.myapp.proxy.ProxyPool;
+import com.myapp.util.Executor;
 import com.myapp.util.HttpStatus;
 import com.myapp.util.ProxyIpCheck;
 import org.apache.log4j.Logger;
 import org.quartz.*;
 import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.ExecutorService;
 
 /**
  * Created by gaorui on 16/12/28.