diff --git a/apm-sniffer/apm-agent-core/src/main/java/org/skywalking/apm/agent/core/remote/DiscoveryRestServiceClient.java b/apm-sniffer/apm-agent-core/src/main/java/org/skywalking/apm/agent/core/remote/DiscoveryRestServiceClient.java
index 72d814461b7df62d1283f228514df10608313d38..6890adc36ada3b22a4803dc8b5f39d7ebfe7c602 100644
--- a/apm-sniffer/apm-agent-core/src/main/java/org/skywalking/apm/agent/core/remote/DiscoveryRestServiceClient.java
+++ b/apm-sniffer/apm-agent-core/src/main/java/org/skywalking/apm/agent/core/remote/DiscoveryRestServiceClient.java
@@ -141,21 +141,12 @@ public class DiscoveryRestServiceClient implements Runnable {
      */
     private void findBackupServer() {
         selectedServer++;
-        if (selectedServer == serverList.length) {
+        if (selectedServer >= serverList.length) {
             selectedServer = 0;
         }
-    }
-
-    /**
-     * Try to sleep, and ignore the {@link InterruptedException}
-     *
-     * @param millis the length of time to sleep in milliseconds
-     */
-    private void try2Sleep(long millis) {
-        try {
-            Thread.sleep(millis);
-        } catch (InterruptedException e) {
 
+        if (serverList.length == 0) {
+            selectedServer = -1;
         }
     }
 }
diff --git a/apm-sniffer/apm-sdk-plugin/spring-plugins/core-patch/pom.xml b/apm-sniffer/apm-sdk-plugin/spring-plugins/core-patch/pom.xml
new file mode 100644
index 0000000000000000000000000000000000000000..c835efe8d070b1dcb7916de2125af5c9ab94d687
--- /dev/null
+++ b/apm-sniffer/apm-sdk-plugin/spring-plugins/core-patch/pom.xml
@@ -0,0 +1,42 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Copyright 2017, OpenSkywalking Organization All rights reserved.
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~     http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  ~
+  ~ Project repository: https://github.com/OpenSkywalking/skywalking
+  -->
+
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>spring-plugins</artifactId>
+        <groupId>org.skywalking</groupId>
+        <version>3.2.5-2017</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>apm-spring-core-patch</artifactId>
+    <name>core-patch</name>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-aop</artifactId>
+            <version>3.2.9.RELEASE</version>
+            <scope>provided</scope>
+        </dependency>
+    </dependencies>
+
+</project>
diff --git a/apm-sniffer/apm-sdk-plugin/spring-plugins/core-patch/src/main/java/org/skywalking/apm/plugin/spring/patch/CreateAopProxyInterceptor.java b/apm-sniffer/apm-sdk-plugin/spring-plugins/core-patch/src/main/java/org/skywalking/apm/plugin/spring/patch/CreateAopProxyInterceptor.java
new file mode 100644
index 0000000000000000000000000000000000000000..1a25564f467d7841eebb610a52f215e285175e0e
--- /dev/null
+++ b/apm-sniffer/apm-sdk-plugin/spring-plugins/core-patch/src/main/java/org/skywalking/apm/plugin/spring/patch/CreateAopProxyInterceptor.java
@@ -0,0 +1,56 @@
+/*
+ * Copyright 2017, OpenSkywalking Organization All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Project repository: https://github.com/OpenSkywalking/skywalking
+ */
+
+package org.skywalking.apm.plugin.spring.patch;
+
+import java.lang.reflect.Method;
+import org.skywalking.apm.agent.core.plugin.interceptor.enhance.EnhancedInstance;
+import org.skywalking.apm.agent.core.plugin.interceptor.enhance.InstanceMethodsAroundInterceptor;
+import org.skywalking.apm.agent.core.plugin.interceptor.enhance.MethodInterceptResult;
+import org.springframework.aop.framework.AdvisedSupport;
+
+/**
+ * {@link CreateAopProxyInterceptor} check that the bean has been implement {@link EnhancedInstance}. <p/>
+ * if yes, true will be returned.
+ *
+ * @author zhang xin
+ */
+public class CreateAopProxyInterceptor implements InstanceMethodsAroundInterceptor {
+
+    @Override
+    public void beforeMethod(EnhancedInstance objInst, Method method, Object[] allArguments, Class<?>[] argumentsTypes,
+        MethodInterceptResult result) throws Throwable {
+
+    }
+
+    @Override
+    public Object afterMethod(EnhancedInstance objInst, Method method, Object[] allArguments, Class<?>[] argumentsTypes,
+        Object ret) throws Throwable {
+        AdvisedSupport advisedSupport = (AdvisedSupport)allArguments[0];
+
+        if (EnhancedInstance.class.isAssignableFrom(advisedSupport.getTargetClass())) {
+            return true;
+        }
+        return ret;
+    }
+
+    @Override public void handleMethodException(EnhancedInstance objInst, Method method, Object[] allArguments,
+        Class<?>[] argumentsTypes, Throwable t) {
+
+    }
+}
diff --git a/apm-sniffer/apm-sdk-plugin/spring-plugins/core-patch/src/main/java/org/skywalking/apm/plugin/spring/patch/define/AopProxyFactoryInstrumentation.java b/apm-sniffer/apm-sdk-plugin/spring-plugins/core-patch/src/main/java/org/skywalking/apm/plugin/spring/patch/define/AopProxyFactoryInstrumentation.java
new file mode 100644
index 0000000000000000000000000000000000000000..ce6c87fce21507f0d2968ac565517307aa87b87a
--- /dev/null
+++ b/apm-sniffer/apm-sdk-plugin/spring-plugins/core-patch/src/main/java/org/skywalking/apm/plugin/spring/patch/define/AopProxyFactoryInstrumentation.java
@@ -0,0 +1,70 @@
+/*
+ * Copyright 2017, OpenSkywalking Organization All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Project repository: https://github.com/OpenSkywalking/skywalking
+ */
+
+package org.skywalking.apm.plugin.spring.patch.define;
+
+import net.bytebuddy.description.method.MethodDescription;
+import net.bytebuddy.matcher.ElementMatcher;
+import org.skywalking.apm.agent.core.plugin.interceptor.ConstructorInterceptPoint;
+import org.skywalking.apm.agent.core.plugin.interceptor.InstanceMethodsInterceptPoint;
+import org.skywalking.apm.agent.core.plugin.interceptor.enhance.ClassInstanceMethodsEnhancePluginDefine;
+import org.skywalking.apm.agent.core.plugin.match.ClassMatch;
+
+import static net.bytebuddy.matcher.ElementMatchers.named;
+import static org.skywalking.apm.agent.core.plugin.match.NameMatch.byName;
+
+/**
+ * {@link AopProxyFactoryInstrumentation} indicate that spring core patch plugin intercepts the {@link
+ * org.springframework.aop.framework.DefaultAopProxyFactory#hasNoUserSuppliedProxyInterfaces} method by using {@link
+ * org.skywalking.apm.plugin.spring.patch.CreateAopProxyInterceptor} class.
+ *
+ * @author zhangxin
+ */
+public class AopProxyFactoryInstrumentation extends ClassInstanceMethodsEnhancePluginDefine {
+
+    private static final String ENHANCE_CLASS = "org.springframework.aop.framework.DefaultAopProxyFactory";
+    public static final String ENHANCE_METHOD = "hasNoUserSuppliedProxyInterfaces";
+    public static final String INTERCEPT_CLASS = "org.skywalking.apm.plugin.spring.patch.CreateAopProxyInterceptor";
+
+    @Override protected final ConstructorInterceptPoint[] getConstructorsInterceptPoints() {
+        return new ConstructorInterceptPoint[0];
+    }
+
+    @Override protected final InstanceMethodsInterceptPoint[] getInstanceMethodsInterceptPoints() {
+        return new InstanceMethodsInterceptPoint[] {
+            new InstanceMethodsInterceptPoint() {
+                @Override public ElementMatcher<MethodDescription> getMethodsMatcher() {
+                    return named(ENHANCE_METHOD);
+                }
+
+                @Override public String getMethodsInterceptor() {
+                    return INTERCEPT_CLASS;
+                }
+
+                @Override public boolean isOverrideArgs() {
+                    return false;
+                }
+            }
+        };
+    }
+
+    @Override protected ClassMatch enhanceClass() {
+        return byName(ENHANCE_CLASS);
+    }
+
+}
diff --git a/apm-sniffer/apm-sdk-plugin/spring-plugins/core-patch/src/main/resources/skywalking-plugin.def b/apm-sniffer/apm-sdk-plugin/spring-plugins/core-patch/src/main/resources/skywalking-plugin.def
new file mode 100644
index 0000000000000000000000000000000000000000..5caefb1d6dd9a2c5663c61323f2356dcdae2eb94
--- /dev/null
+++ b/apm-sniffer/apm-sdk-plugin/spring-plugins/core-patch/src/main/resources/skywalking-plugin.def
@@ -0,0 +1 @@
+spring-core-patch=org.skywalking.apm.plugin.spring.patch.define.AopProxyFactoryInstrumentation
diff --git a/apm-sniffer/apm-sdk-plugin/spring-plugins/core-patch/src/test/java/org/skywalking/apm/plugin/spring/patch/CreateAopProxyInterceptorTest.java b/apm-sniffer/apm-sdk-plugin/spring-plugins/core-patch/src/test/java/org/skywalking/apm/plugin/spring/patch/CreateAopProxyInterceptorTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..e372866da222c1d3d4b9fb9fa64fc359502cec20
--- /dev/null
+++ b/apm-sniffer/apm-sdk-plugin/spring-plugins/core-patch/src/test/java/org/skywalking/apm/plugin/spring/patch/CreateAopProxyInterceptorTest.java
@@ -0,0 +1,73 @@
+/*
+ * Copyright 2017, OpenSkywalking Organization All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Project repository: https://github.com/OpenSkywalking/skywalking
+ */
+
+package org.skywalking.apm.plugin.spring.patch;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.runners.MockitoJUnitRunner;
+import org.skywalking.apm.agent.core.plugin.interceptor.enhance.EnhancedInstance;
+import org.springframework.aop.framework.AdvisedSupport;
+
+import static org.hamcrest.core.Is.is;
+import static org.junit.Assert.assertThat;
+import static org.mockito.Mockito.doReturn;
+
+@RunWith(MockitoJUnitRunner.class)
+public class CreateAopProxyInterceptorTest {
+
+    private CreateAopProxyInterceptor interceptor;
+
+    @Mock
+    private EnhancedInstance enhancedInstance;
+
+    @Mock
+    private AdvisedSupport advisedSupport;
+
+    @Before
+    public void setUp() {
+        interceptor = new CreateAopProxyInterceptor();
+
+    }
+
+    @Test
+    public void testInterceptNormalObject() throws Throwable {
+        doReturn(Object.class).when(advisedSupport).getTargetClass();
+        assertThat(false, is(interceptor.afterMethod(enhancedInstance, null, new Object[] {advisedSupport}, new Class[] {Object.class}, false)));
+    }
+
+    @Test
+    public void testInterceptEnhanceInstanceObject() throws Throwable {
+        doReturn(MockClass.class).when(advisedSupport).getTargetClass();
+        assertThat(true, is(interceptor.afterMethod(enhancedInstance, null, new Object[] {advisedSupport}, new Class[] {Object.class}, false)));
+    }
+
+    private class MockClass implements EnhancedInstance {
+
+        @Override public Object getSkyWalkingDynamicField() {
+            return null;
+        }
+
+        @Override public void setSkyWalkingDynamicField(Object value) {
+
+        }
+    }
+
+}
diff --git a/apm-sniffer/apm-sdk-plugin/spring-plugins/pom.xml b/apm-sniffer/apm-sdk-plugin/spring-plugins/pom.xml
index c3236975da9e10872993654f63201f711c717d3f..bc0a6e85f94b885657a409a447ccf532d9d4e7de 100644
--- a/apm-sniffer/apm-sdk-plugin/spring-plugins/pom.xml
+++ b/apm-sniffer/apm-sdk-plugin/spring-plugins/pom.xml
@@ -34,6 +34,7 @@
         <module>mvc-annotation-4.x-plugin</module>
         <module>spring-cloud</module>
         <module>mvc-annotation-3.x-plugin</module>
+        <module>core-patch</module>
     </modules>
     <packaging>pom</packaging>