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 542ebc256edecf4e2e4e3c38a626383cecd1bdad..24fe3be87dd7a720aebec7ed22af5c1ea96827dd 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
@@ -34,6 +34,7 @@ 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;
 
@@ -50,14 +51,13 @@ public class AgentClassLoader extends ClassLoader {
     private List<File> classpath;
     private List<Jar> allJars;
     private ReentrantLock jarScanLock = new ReentrantLock();
-    private ReentrantLock loadClassLock = new ReentrantLock();
 
     public static AgentClassLoader getDefault() {
         return LOADER;
     }
 
     public static AgentClassLoader initDefaultLoader() throws AgentPackageNotFoundException {
-        LOADER = new AgentClassLoader(AgentClassLoader.class.getClassLoader());
+        LOADER = new AgentClassLoader(PluginBootstrap.class.getClassLoader());
         return getDefault();
     }
 
@@ -69,44 +69,15 @@ public class AgentClassLoader extends ClassLoader {
         classpath.add(new File(agentDictionary, "activations"));
     }
 
-    protected Class<?> loadClass(String name, boolean resolve)
-        throws ClassNotFoundException {
-        loadClassLock.lock();
-        try {
-            // First, check if the class has already been loaded
-            Class<?> c = findLoadedClass(name);
-            if (c == null) {
-                try {
-                    super.loadClass(name, resolve);
-                } catch (ClassNotFoundException e) {
-                    // ClassNotFoundException thrown if class not found
-                    // from the non-null parent class loader
-                }
-
-                if (c == null) {
-                    // If still not found, then invoke findClass in order
-                    // to find the class.
-                    c = findClass(name);
-                }
-            }
-            if (resolve) {
-                resolveClass(c);
-            }
-            return c;
-        } finally {
-            loadClassLock.unlock();
-        }
-    }
-
     @Override
     protected Class<?> findClass(String name) throws ClassNotFoundException {
         List<Jar> allJars = getAllJars();
-        String path = "/" + name.replace('.', '/').concat(".class");
+        String path = name.replace('.', '/').concat(".class");
         for (Jar jar : allJars) {
             JarEntry entry = jar.jarFile.getJarEntry(path);
             if (entry != null) {
                 try {
-                    URL classFileUrl = new URL("jar:file:" + jar.sourceFile.getAbsolutePath() + "!/" + name);
+                    URL classFileUrl = new URL("jar:file:" + jar.sourceFile.getAbsolutePath() + "!/" + path);
                     byte[] data = null;
                     BufferedInputStream is = null;
                     ByteArrayOutputStream baos = null;
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 90b66e2bc48adc4de3afc064b2e890267d3e3e56..7b2efeead54dd6c4522ab0708d17a678f1293ae9 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
@@ -66,20 +66,16 @@ public class InterceptorInstanceLoader {
         String instanceKey = className + "_OF_" + targetClassLoader.getClass().getName() + "@" + Integer.toHexString(targetClassLoader.hashCode());
         Object inst = INSTANCE_CACHE.get(instanceKey);
         if (inst == null) {
-            if (InterceptorInstanceLoader.class.getClassLoader().equals(targetClassLoader)) {
-                inst = targetClassLoader.loadClass(className).newInstance();
-            } else {
-                INSTANCE_LOAD_LOCK.lock();
-                try {
-                    ClassLoader pluginLoader = EXTEND_PLUGIN_CLASSLOADERS.get(targetClassLoader);
-                    if (pluginLoader == null) {
-                        pluginLoader = new AgentClassLoader(targetClassLoader);
-                        EXTEND_PLUGIN_CLASSLOADERS.put(targetClassLoader, pluginLoader);
-                    }
-                    inst = Class.forName(className, true, pluginLoader).newInstance();
-                } finally {
-                    INSTANCE_LOAD_LOCK.unlock();
+            INSTANCE_LOAD_LOCK.lock();
+            try {
+                ClassLoader pluginLoader = EXTEND_PLUGIN_CLASSLOADERS.get(targetClassLoader);
+                if (pluginLoader == null) {
+                    pluginLoader = new AgentClassLoader(targetClassLoader);
+                    EXTEND_PLUGIN_CLASSLOADERS.put(targetClassLoader, pluginLoader);
                 }
+                inst = Class.forName(className, true, pluginLoader).newInstance();
+            } finally {
+                INSTANCE_LOAD_LOCK.unlock();
             }
             if (inst != null) {
                 INSTANCE_CACHE.put(instanceKey, inst);
diff --git a/apm-sniffer/apm-agent/pom.xml b/apm-sniffer/apm-agent/pom.xml
index d947eb0cdac5569db5caa3649e582899a040f59b..07fd2bed53bf5e8812161cf6e140e6162661bcc3 100644
--- a/apm-sniffer/apm-agent/pom.xml
+++ b/apm-sniffer/apm-agent/pom.xml
@@ -35,8 +35,6 @@
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <premain.class>org.skywalking.apm.agent.SkyWalkingAgent</premain.class>
-
-        <shade.package>org.skywalking.apm.dependencies</shade.package>
         <shade.net.bytebuddy.source>net.bytebuddy</shade.net.bytebuddy.source>
         <shade.net.bytebuddy.target>${shade.package}.${shade.net.bytebuddy.source}</shade.net.bytebuddy.target>
     </properties>
diff --git a/apm-sniffer/apm-sdk-plugin/pom.xml b/apm-sniffer/apm-sdk-plugin/pom.xml
index ef82414e3cc18f0352dd0601dc587e5a7764dde0..9715fc4ffd209993c06843689b11bec791e3015a 100644
--- a/apm-sniffer/apm-sdk-plugin/pom.xml
+++ b/apm-sniffer/apm-sdk-plugin/pom.xml
@@ -55,6 +55,8 @@
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <sdk.plugin.related.dir></sdk.plugin.related.dir>
+        <shade.net.bytebuddy.source>net.bytebuddy</shade.net.bytebuddy.source>
+        <shade.net.bytebuddy.target>${shade.package}.${shade.net.bytebuddy.source}</shade.net.bytebuddy.target>
     </properties>
 
     <dependencies>
@@ -62,6 +64,13 @@
             <groupId>org.skywalking</groupId>
             <artifactId>apm-agent-core</artifactId>
             <version>${project.version}</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.skywalking</groupId>
+            <artifactId>apm-util</artifactId>
+            <version>${project.version}</version>
+            <scope>provided</scope>
         </dependency>
         <dependency>
             <groupId>org.skywalking</groupId>
@@ -73,6 +82,44 @@
 
     <build>
         <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-shade-plugin</artifactId>
+                <version>2.4.1</version>
+                <executions>
+                    <execution>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>shade</goal>
+                        </goals>
+                        <configuration>
+                            <shadedArtifactAttached>false</shadedArtifactAttached>
+                            <createDependencyReducedPom>true</createDependencyReducedPom>
+                            <createSourcesJar>true</createSourcesJar>
+                            <shadeSourcesContent>true</shadeSourcesContent>
+                            <artifactSet>
+                                <excludes>
+                                    <exclude>com.lmax:*</exclude>
+                                    <exclude>org.apache.httpcomponents:*</exclude>
+                                    <exclude>commons-logging:*</exclude>
+                                    <exclude>commons-codec:*</exclude>
+                                    <exclude>*:gson</exclude>
+                                    <exclude>io.grpc:*</exclude>
+                                    <exclude>io.netty:*</exclude>
+                                    <exclude>com.google.*:*</exclude>
+                                    <exclude>com.google.guava:guava</exclude>
+                                </excludes>
+                            </artifactSet>
+                            <relocations>
+                                <relocation>
+                                    <pattern>${shade.net.bytebuddy.source}</pattern>
+                                    <shadedPattern>${shade.net.bytebuddy.target}</shadedPattern>
+                                </relocation>
+                            </relocations>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-resources-plugin</artifactId>
diff --git a/apm-sniffer/apm-toolkit-activation/pom.xml b/apm-sniffer/apm-toolkit-activation/pom.xml
index b0d9e5ed731e8bc2239ea9fdaa9439421966b1d8..8cf9d3450b916cc4c3de1b0e3ec79429ca4a230a 100644
--- a/apm-sniffer/apm-toolkit-activation/pom.xml
+++ b/apm-sniffer/apm-toolkit-activation/pom.xml
@@ -37,8 +37,73 @@
 
     <artifactId>apm-toolkit-activation</artifactId>
 
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <shade.net.bytebuddy.source>net.bytebuddy</shade.net.bytebuddy.source>
+        <shade.net.bytebuddy.target>${shade.package}.${shade.net.bytebuddy.source}</shade.net.bytebuddy.target>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.skywalking</groupId>
+            <artifactId>apm-agent-core</artifactId>
+            <version>${project.version}</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.skywalking</groupId>
+            <artifactId>apm-util</artifactId>
+            <version>${project.version}</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.skywalking</groupId>
+            <artifactId>apm-test-tools</artifactId>
+            <version>${project.version}</version>
+            <scope>provided</scope>
+        </dependency>
+    </dependencies>
+
     <build>
         <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-shade-plugin</artifactId>
+                <version>2.4.1</version>
+                <executions>
+                    <execution>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>shade</goal>
+                        </goals>
+                        <configuration>
+                            <shadedArtifactAttached>false</shadedArtifactAttached>
+                            <createDependencyReducedPom>true</createDependencyReducedPom>
+                            <createSourcesJar>true</createSourcesJar>
+                            <shadeSourcesContent>true</shadeSourcesContent>
+                            <artifactSet>
+                                <excludes>
+                                    <exclude>com.lmax:*</exclude>
+                                    <exclude>org.apache.httpcomponents:*</exclude>
+                                    <exclude>commons-logging:*</exclude>
+                                    <exclude>commons-codec:*</exclude>
+                                    <exclude>*:gson</exclude>
+                                    <exclude>io.grpc:*</exclude>
+                                    <exclude>io.netty:*</exclude>
+                                    <exclude>com.google.*:*</exclude>
+                                    <exclude>com.google.guava:guava</exclude>
+                                </excludes>
+                            </artifactSet>
+                            <relocations>
+                                <relocation>
+                                    <pattern>${shade.net.bytebuddy.source}</pattern>
+                                    <shadedPattern>${shade.net.bytebuddy.target}</shadedPattern>
+                                </relocation>
+                            </relocations>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-antrun-plugin</artifactId>
@@ -86,17 +151,4 @@
             </plugin>
         </plugins>
     </build>
-
-    <dependencies>
-        <dependency>
-            <groupId>org.skywalking</groupId>
-            <artifactId>apm-agent-core</artifactId>
-            <version>${project.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.skywalking</groupId>
-            <artifactId>apm-test-tools</artifactId>
-            <version>${project.version}</version>
-        </dependency>
-    </dependencies>
 </project>
diff --git a/apm-sniffer/pom.xml b/apm-sniffer/pom.xml
index 06a420a22c0f5ccc3d922d066042c33e57816397..e92bd4cc8047623cb2fcd00dd4097f415845fd5a 100644
--- a/apm-sniffer/pom.xml
+++ b/apm-sniffer/pom.xml
@@ -40,13 +40,14 @@
 
     <properties>
         <compiler.version>1.6</compiler.version>
+        <shade.package>org.skywalking.apm.dependencies</shade.package>
     </properties>
 
     <dependencies>
         <dependency>
             <groupId>org.skywalking</groupId>
             <artifactId>apm-util</artifactId>
-            <version>3.2.3-2017</version>
+            <version>${project.version}</version>
         </dependency>
     </dependencies>
 </project>