diff --git a/apm-sniffer/apm-agent-core/src/main/java/org/skywalking/apm/agent/core/plugin/loader/AgentClassLoader.java b/apm-sniffer/apm-agent-core/src/main/java/org/skywalking/apm/agent/core/plugin/loader/AgentClassLoader.java
index 35eba4f25ecf4e5e192f0bb39889b4db46d04931..2ba28c433fc76099403e9a40f9a4e526c1cece7a 100644
--- a/apm-sniffer/apm-agent-core/src/main/java/org/skywalking/apm/agent/core/plugin/loader/AgentClassLoader.java
+++ b/apm-sniffer/apm-agent-core/src/main/java/org/skywalking/apm/agent/core/plugin/loader/AgentClassLoader.java
@@ -18,11 +18,13 @@
 
 package org.skywalking.apm.agent.core.plugin.loader;
 
-import java.io.BufferedInputStream;
-import java.io.ByteArrayOutputStream;
-import java.io.File;
-import java.io.FilenameFilter;
-import java.io.IOException;
+import org.skywalking.apm.agent.core.boot.AgentPackageNotFoundException;
+import org.skywalking.apm.agent.core.boot.AgentPackagePath;
+import org.skywalking.apm.agent.core.plugin.PluginBootstrap;
+import org.skywalking.apm.logging.ILog;
+import org.skywalking.apm.logging.LogManager;
+
+import java.io.*;
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.util.Enumeration;
@@ -32,11 +34,6 @@ import java.util.List;
 import java.util.concurrent.locks.ReentrantLock;
 import java.util.jar.JarEntry;
 import java.util.jar.JarFile;
-import org.skywalking.apm.agent.core.boot.AgentPackageNotFoundException;
-import org.skywalking.apm.agent.core.boot.AgentPackagePath;
-import org.skywalking.apm.agent.core.plugin.PluginBootstrap;
-import org.skywalking.apm.logging.ILog;
-import org.skywalking.apm.logging.LogManager;
 
 /**
  * The <code>AgentClassLoader</code> represents a classloader,
@@ -61,6 +58,7 @@ public class AgentClassLoader extends ClassLoader {
 
     /**
      * Init the default
+     *
      * @return
      * @throws AgentPackageNotFoundException
      */
@@ -149,11 +147,13 @@ public class AgentClassLoader extends ClassLoader {
 
         final Iterator<URL> iterator = allResources.iterator();
         return new Enumeration<URL>() {
-            @Override public boolean hasMoreElements() {
+            @Override
+            public boolean hasMoreElements() {
                 return iterator.hasNext();
             }
 
-            @Override public URL nextElement() {
+            @Override
+            public URL nextElement() {
                 return iterator.next();
             }
         };
@@ -168,7 +168,8 @@ public class AgentClassLoader extends ClassLoader {
                     for (File path : classpath) {
                         if (path.exists() && path.isDirectory()) {
                             String[] jarFileNames = path.list(new FilenameFilter() {
-                                @Override public boolean accept(File dir, String name) {
+                                @Override
+                                public boolean accept(File dir, String name) {
                                     return name.endsWith(".jar");
                                 }
                             });
diff --git a/apm-sniffer/apm-agent-core/src/main/java/org/skywalking/apm/agent/core/plugin/loader/InterceptorInstanceLoader.java b/apm-sniffer/apm-agent-core/src/main/java/org/skywalking/apm/agent/core/plugin/loader/InterceptorInstanceLoader.java
index 6d51e286b4d1c37cba1bdaa90be23c84300da703..5eb409f1337b6612111ba18c05a0b5f28c35e668 100644
--- a/apm-sniffer/apm-agent-core/src/main/java/org/skywalking/apm/agent/core/plugin/loader/InterceptorInstanceLoader.java
+++ b/apm-sniffer/apm-agent-core/src/main/java/org/skywalking/apm/agent/core/plugin/loader/InterceptorInstanceLoader.java
@@ -18,24 +18,16 @@
 
 package org.skywalking.apm.agent.core.plugin.loader;
 
-import java.io.BufferedInputStream;
-import java.io.ByteArrayOutputStream;
-import java.io.IOException;
+import org.skywalking.apm.agent.core.boot.AgentPackageNotFoundException;
+import org.skywalking.apm.logging.ILog;
+import org.skywalking.apm.logging.LogManager;
+
 import java.lang.reflect.InvocationTargetException;
-import java.lang.reflect.Method;
-import java.security.ProtectionDomain;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.locks.ReentrantLock;
 
-import org.skywalking.apm.agent.core.boot.AgentPackageNotFoundException;
-import org.skywalking.apm.agent.core.plugin.interceptor.enhance.InstanceConstructorInterceptor;
-import org.skywalking.apm.agent.core.plugin.interceptor.enhance.InstanceMethodsAroundInterceptor;
-import org.skywalking.apm.agent.core.plugin.interceptor.enhance.StaticMethodsAroundInterceptor;
-import org.skywalking.apm.logging.ILog;
-import org.skywalking.apm.logging.LogManager;
-
 /**
  * The <code>InterceptorInstanceLoader</code> is a classes finder and container.
  * <p>
@@ -56,9 +48,9 @@ public class InterceptorInstanceLoader {
      * Create {@link AgentClassLoader} for each targetClassLoader, as an extend classloader.
      * It can load interceptor classes from plugins, activations folders.
      *
-     * @param className the interceptor class, which is expected to be found
+     * @param className         the interceptor class, which is expected to be found
      * @param targetClassLoader the class loader for current application context
-     * @param <T> expected type
+     * @param <T>               expected type
      * @return the type reference.
      * @throws InvocationTargetException
      * @throws IllegalAccessException