diff --git a/apm-sniffer/apm-agent-core/src/test/java/org/skywalking/apm/agent/core/boot/ServiceManagerTest.java b/apm-sniffer/apm-agent-core/src/test/java/org/skywalking/apm/agent/core/boot/ServiceManagerTest.java
index af13fd0f67c36093c39a536efc54daf097e376c1..c28ae515afe07af9c4d8c8b637c43a85e8cc938b 100644
--- a/apm-sniffer/apm-agent-core/src/test/java/org/skywalking/apm/agent/core/boot/ServiceManagerTest.java
+++ b/apm-sniffer/apm-agent-core/src/test/java/org/skywalking/apm/agent/core/boot/ServiceManagerTest.java
@@ -21,6 +21,8 @@ package org.skywalking.apm.agent.core.boot;
 import java.lang.reflect.Field;
 import java.util.HashMap;
 import java.util.List;
+
+import org.junit.AfterClass;
 import org.junit.Rule;
 import org.junit.Test;
 import org.skywalking.apm.agent.core.context.ContextManager;
@@ -45,6 +47,11 @@ public class ServiceManagerTest {
     @Rule
     public AgentServiceRule agentServiceRule = new AgentServiceRule();
 
+    @AfterClass
+    public static void afterClass() {
+        ServiceManager.INSTANCE.shutdown();
+    }
+
     @Test
     public void testServiceDependencies() throws Exception {
         HashMap<Class, BootService> registryService = getFieldValue(ServiceManager.INSTANCE, "bootedServices");
diff --git a/apm-sniffer/apm-agent-core/src/test/java/org/skywalking/apm/agent/core/context/ContextManagerTest.java b/apm-sniffer/apm-agent-core/src/test/java/org/skywalking/apm/agent/core/context/ContextManagerTest.java
index e5750747cd546eb306167d7bd28fdce5b1cd2319..68d741da5e42e38dc9194045fb7ce973f7dd8c47 100644
--- a/apm-sniffer/apm-agent-core/src/test/java/org/skywalking/apm/agent/core/context/ContextManagerTest.java
+++ b/apm-sniffer/apm-agent-core/src/test/java/org/skywalking/apm/agent/core/context/ContextManagerTest.java
@@ -20,11 +20,10 @@ package org.skywalking.apm.agent.core.context;
 
 import com.google.protobuf.InvalidProtocolBufferException;
 import java.util.List;
-import org.junit.After;
-import org.junit.Before;
-import org.junit.Rule;
-import org.junit.Test;
+
+import org.junit.*;
 import org.junit.runner.RunWith;
+import org.skywalking.apm.agent.core.boot.ServiceManager;
 import org.skywalking.apm.agent.core.conf.RemoteDownstreamConfig;
 import org.skywalking.apm.agent.core.context.tag.Tags;
 import org.skywalking.apm.agent.core.context.trace.AbstractSpan;
@@ -71,6 +70,12 @@ public class ContextManagerTest {
         RemoteDownstreamConfig.Agent.APPLICATION_INSTANCE_ID = 1;
     }
 
+    @AfterClass
+    public static void afterClass() {
+        ServiceManager.INSTANCE.shutdown();
+
+    }
+
     @Test
     public void createSpanWithInvalidateContextCarrier() {
         ContextCarrier contextCarrier = new ContextCarrier().deserialize("#AQA=#AQA=4WcWe0tQNQA=|1|#127.0.0.1:8080|#/testEntrySpan|#/testEntrySpan|#AQA=#AQA=Et0We0tQNQA=");
diff --git a/apm-sniffer/apm-agent-core/src/test/java/org/skywalking/apm/agent/core/context/IgnoredTracerContextTest.java b/apm-sniffer/apm-agent-core/src/test/java/org/skywalking/apm/agent/core/context/IgnoredTracerContextTest.java
index 11c11d5ae35e663c6089f4db06f4a5fccec3d871..a5a6b33ebff651bf3a947c236a0ee01a013e9c37 100644
--- a/apm-sniffer/apm-agent-core/src/test/java/org/skywalking/apm/agent/core/context/IgnoredTracerContextTest.java
+++ b/apm-sniffer/apm-agent-core/src/test/java/org/skywalking/apm/agent/core/context/IgnoredTracerContextTest.java
@@ -19,10 +19,8 @@
 package org.skywalking.apm.agent.core.context;
 
 import java.util.LinkedList;
-import org.junit.After;
-import org.junit.Before;
-import org.junit.Rule;
-import org.junit.Test;
+
+import org.junit.*;
 import org.junit.runner.RunWith;
 import org.skywalking.apm.agent.core.boot.ServiceManager;
 import org.skywalking.apm.agent.core.conf.Config;
@@ -53,6 +51,11 @@ public class IgnoredTracerContextTest {
         RemoteDownstreamConfig.Agent.APPLICATION_INSTANCE_ID = 1;
     }
 
+    @AfterClass
+    public static void afterClass() {
+        ServiceManager.INSTANCE.shutdown();
+    }
+
     @After
     public void tearDown() throws Exception {
     }
diff --git a/apm-sniffer/apm-agent-core/src/test/java/org/skywalking/apm/agent/core/remote/DiscoveryRestServiceClientTest.java b/apm-sniffer/apm-agent-core/src/test/java/org/skywalking/apm/agent/core/remote/DiscoveryRestServiceClientTest.java
index 8106f7ff06716fd84a4ec2a1300eff8b94dedda7..2809310892622dcee468089f1d8512c9ebb7a308 100644
--- a/apm-sniffer/apm-agent-core/src/test/java/org/skywalking/apm/agent/core/remote/DiscoveryRestServiceClientTest.java
+++ b/apm-sniffer/apm-agent-core/src/test/java/org/skywalking/apm/agent/core/remote/DiscoveryRestServiceClientTest.java
@@ -19,11 +19,11 @@
 package org.skywalking.apm.agent.core.remote;
 
 import com.github.tomakehurst.wiremock.junit.WireMockRule;
+
 import java.io.IOException;
-import org.junit.After;
-import org.junit.Before;
-import org.junit.Rule;
-import org.junit.Test;
+
+import org.junit.*;
+import org.skywalking.apm.agent.core.boot.ServiceManager;
 import org.skywalking.apm.agent.core.conf.Config;
 import org.skywalking.apm.agent.core.conf.RemoteDownstreamConfig;
 import org.skywalking.apm.agent.core.test.tools.AgentServiceRule;
@@ -44,32 +44,37 @@ public class DiscoveryRestServiceClientTest {
     @Rule
     public WireMockRule wireMockRule = new WireMockRule(8089);
 
+    @AfterClass
+    public static void afterClass() {
+        ServiceManager.INSTANCE.shutdown();
+    }
+
     @Before
     public void setUpBeforeClass() {
         Config.Collector.DISCOVERY_CHECK_INTERVAL = 1;
         stubFor(get(urlEqualTo("/withoutResult"))
-            .willReturn(aResponse()
-                .withStatus(200)
-                .withHeader("Content-Type", "application/json")
-                .withBody("[]")));
+                .willReturn(aResponse()
+                        .withStatus(200)
+                        .withHeader("Content-Type", "application/json")
+                        .withBody("[]")));
         stubFor(get(urlEqualTo("/withResult"))
-            .willReturn(aResponse()
-                .withStatus(200)
-                .withHeader("Content-Type", "application/json")
-                .withBody("['127.0.0.1:8080','127.0.0.1:8090']")));
+                .willReturn(aResponse()
+                        .withStatus(200)
+                        .withHeader("Content-Type", "application/json")
+                        .withBody("['127.0.0.1:8080','127.0.0.1:8090']")));
         stubFor(get(urlEqualTo("/withSameResult"))
-            .willReturn(aResponse()
-                .withStatus(200)
-                .withHeader("Content-Type", "application/json")
-                .withBody("['127.0.0.1:8090','127.0.0.1:8080']")));
+                .willReturn(aResponse()
+                        .withStatus(200)
+                        .withHeader("Content-Type", "application/json")
+                        .withBody("['127.0.0.1:8090','127.0.0.1:8080']")));
         stubFor(get(urlEqualTo("/withDifferenceResult"))
-            .willReturn(aResponse()
-                .withStatus(200)
-                .withHeader("Content-Type", "application/json")
-                .withBody("['127.0.0.1:9090','127.0.0.1:18090']")));
+                .willReturn(aResponse()
+                        .withStatus(200)
+                        .withHeader("Content-Type", "application/json")
+                        .withBody("['127.0.0.1:9090','127.0.0.1:18090']")));
         stubFor(get(urlEqualTo("/with404"))
-            .willReturn(aResponse()
-                .withStatus(400)));
+                .willReturn(aResponse()
+                        .withStatus(400)));
     }
 
     @Test
diff --git a/apm-sniffer/apm-agent-core/src/test/java/org/skywalking/apm/agent/core/remote/TraceSegmentServiceClientTest.java b/apm-sniffer/apm-agent-core/src/test/java/org/skywalking/apm/agent/core/remote/TraceSegmentServiceClientTest.java
index ebd4acaa201ae72fb950891681d8ba75e6e3c0e1..84b9dfefcf23d33b7906df43305ce3b5ac36983d 100644
--- a/apm-sniffer/apm-agent-core/src/test/java/org/skywalking/apm/agent/core/remote/TraceSegmentServiceClientTest.java
+++ b/apm-sniffer/apm-agent-core/src/test/java/org/skywalking/apm/agent/core/remote/TraceSegmentServiceClientTest.java
@@ -21,12 +21,11 @@ package org.skywalking.apm.agent.core.remote;
 import com.google.protobuf.InvalidProtocolBufferException;
 import io.grpc.stub.StreamObserver;
 import io.grpc.testing.GrpcServerRule;
+
 import java.util.ArrayList;
 import java.util.List;
-import org.junit.Before;
-import org.junit.BeforeClass;
-import org.junit.Rule;
-import org.junit.Test;
+
+import org.junit.*;
 import org.junit.runner.RunWith;
 import org.powermock.reflect.Whitebox;
 import org.skywalking.apm.agent.core.boot.ServiceManager;
@@ -94,13 +93,18 @@ public class TraceSegmentServiceClientTest {
         RemoteDownstreamConfig.Agent.APPLICATION_INSTANCE_ID = 1;
     }
 
+    @AfterClass
+    public static void afterClass() {
+        ServiceManager.INSTANCE.shutdown();
+    }
+
     @Before
     public void setUp() throws Throwable {
         Whitebox.setInternalState(ServiceManager.INSTANCE.findService(GRPCChannelManager.class), "reconnect", false);
         spy(serviceClient);
 
         Whitebox.setInternalState(serviceClient, "serviceStub",
-            TraceSegmentServiceGrpc.newStub(grpcServerRule.getChannel()));
+                TraceSegmentServiceGrpc.newStub(grpcServerRule.getChannel()));
         Whitebox.setInternalState(serviceClient, "status", GRPCChannelStatus.CONNECTED);
 
         upstreamSegments = new ArrayList<UpstreamSegment>();