diff --git a/client-adapter/common/src/main/java/com/alibaba/otter/canal/client/adapter/support/ExtensionLoader.java b/client-adapter/common/src/main/java/com/alibaba/otter/canal/client/adapter/support/ExtensionLoader.java
index b29bff4a..860cb82b 100644
--- a/client-adapter/common/src/main/java/com/alibaba/otter/canal/client/adapter/support/ExtensionLoader.java
+++ b/client-adapter/common/src/main/java/com/alibaba/otter/canal/client/adapter/support/ExtensionLoader.java
@@ -2,13 +2,15 @@ package com.alibaba.otter.canal.client.adapter.support;
 
 import java.io.BufferedReader;
 import java.io.File;
-import java.io.IOException;
 import java.io.InputStreamReader;
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.net.URLClassLoader;
 import java.nio.file.Paths;
-import java.util.*;
+import java.util.Arrays;
+import java.util.Enumeration;
+import java.util.HashMap;
+import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;
 import java.util.regex.Pattern;
@@ -178,8 +180,9 @@ public class ExtensionLoader<T> {
 
     @SuppressWarnings("unchecked")
     private T createExtension(String name, String key) {
-        System.out.println("xxxxxxxxxxxxx");
-        getExtensionClasses().forEach((k, v) -> logger.info("fffff: " + k + " " + v.getName()));
+        // System.out.println("xxxxxxxxxxxxx");
+        // getExtensionClasses().forEach((k, v) -> logger.info("fffff: " + k +
+        // " " + v.getName()));
         Class<?> clazz = getExtensionClasses().get(name);
         if (clazz == null) {
             throw new IllegalStateException("Extension instance(name: " + name + ", class: " + type