diff --git a/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/context/TracerContext.java b/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/context/TracerContext.java
index ea8faf001..4ef3d3188 100644
--- a/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/context/TracerContext.java
+++ b/skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/context/TracerContext.java
@@ -171,7 +171,7 @@ public final class TracerContext {
         /**
          * Clear the given {@link TracerContextListener}
          */
-        static synchronized void remove(TracerContextListener listener){
+        public static synchronized void remove(TracerContextListener listener){
             listeners.remove(listener);
         }
     }
diff --git a/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/context/MockTracerContextListener.java b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/context/MockTracerContextListener.java
index ec7e1ccde..a79f80e1a 100644
--- a/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/context/MockTracerContextListener.java
+++ b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/context/MockTracerContextListener.java
@@ -48,4 +48,14 @@ public class MockTracerContextListener implements TracerContextListener {
     public void clear(){
         finishedTraceSegments.clear();
     }
+
+    /**
+     * Get {@link TraceSegment} of the given index.
+     * @param index
+     * @return
+     */
+    public TraceSegment getFinished(int index){
+        assertSize(index + 1);
+        return finishedTraceSegments.get(index);
+    }
 }
diff --git a/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/TraceSegmentBuilder.java b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/TraceSegmentBuilder.java
index 57e48fd19..55743677a 100644
--- a/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/TraceSegmentBuilder.java
+++ b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/TraceSegmentBuilder.java
@@ -1,10 +1,11 @@
 package com.a.eye.skywalking.sniffer.mock.trace;
 
+import com.a.eye.skywalking.sniffer.mock.context.MockTracerContextListener;
 import com.a.eye.skywalking.trace.TraceSegment;
 
 /**
  * Created by wusheng on 2017/2/20.
  */
 public interface TraceSegmentBuilder {
-    TraceSegment build();
+    TraceSegment build(MockTracerContextListener listener);
 }
diff --git a/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/TraceSegmentBuilderFactory.java b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/TraceSegmentBuilderFactory.java
index 6714ced0b..f13b49a8f 100644
--- a/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/TraceSegmentBuilderFactory.java
+++ b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/TraceSegmentBuilderFactory.java
@@ -1,9 +1,11 @@
 package com.a.eye.skywalking.sniffer.mock.trace;
 
-import com.a.eye.skywalking.sniffer.mock.trace.builders.SingleTomcat200TraceBuilder;
+import com.a.eye.skywalking.api.context.TracerContext;
+import com.a.eye.skywalking.sniffer.mock.context.MockTracerContextListener;
+import com.a.eye.skywalking.sniffer.mock.trace.builders.trace.SingleTomcat200TraceBuilder;
+import com.a.eye.skywalking.sniffer.mock.trace.builders.trace.SingleTomcat404TraceBuilder;
+import com.a.eye.skywalking.sniffer.mock.trace.builders.trace.SingleTomcat500TraceBuilder;
 import com.a.eye.skywalking.trace.TraceSegment;
-import java.util.HashMap;
-import java.util.Map;
 
 /**
  * The <code>TraceSegmentBuilderFactory</code> contains all {@link TraceSegmentBuilder} implementations.
@@ -14,22 +16,41 @@ import java.util.Map;
 public enum TraceSegmentBuilderFactory {
     INSTANCE;
 
-    private Map<String, TraceSegmentBuilder> allBuilders;
-
-    TraceSegmentBuilderFactory(){
-        allBuilders = new HashMap<String, TraceSegmentBuilder>();
-        initialize();
-    }
-
+    /**
+     * @see {@link SingleTomcat200TraceBuilder}
+     *
+     * @return
+     */
     public TraceSegment singleTomcat200Trace(){
-        return allBuilders.get(SingleTomcat200TraceBuilder.INSTANCE).build();
+       return this.build(SingleTomcat200TraceBuilder.INSTANCE);
     }
 
-    private void initialize(){
-        initBuilder(SingleTomcat200TraceBuilder.INSTANCE);
+    /**
+     * @see {@link SingleTomcat404TraceBuilder}
+     *
+     * @return
+     */
+    public TraceSegment singleTomcat404Trace(){
+        return this.build(SingleTomcat404TraceBuilder.INSTANCE);
     }
 
-    private void initBuilder(TraceSegmentBuilder builder){
-        allBuilders.put(builder.toString(), builder);
+    /**
+     * @see {@link SingleTomcat500TraceBuilder}
+     *
+     * @return
+     */
+    public TraceSegment singleTomcat500Trace(){
+        return this.build(SingleTomcat500TraceBuilder.INSTANCE);
     }
+
+    private TraceSegment build(TraceSegmentBuilder builder){
+        MockTracerContextListener listener = new MockTracerContextListener();
+        try{
+            TracerContext.ListenerManager.add(listener);
+            return builder.build(listener);
+        }finally{
+            TracerContext.ListenerManager.remove(listener);
+        }
+    }
+
 }
diff --git a/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/SingleTomcat200TraceBuilder.java b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/SingleTomcat200TraceBuilder.java
deleted file mode 100644
index d84eb8d79..000000000
--- a/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/SingleTomcat200TraceBuilder.java
+++ /dev/null
@@ -1,27 +0,0 @@
-package com.a.eye.skywalking.sniffer.mock.trace.builders;
-
-import com.a.eye.skywalking.api.context.ContextManager;
-import com.a.eye.skywalking.sniffer.mock.trace.TraceSegmentBuilder;
-import com.a.eye.skywalking.trace.Span;
-import com.a.eye.skywalking.trace.TraceSegment;
-import com.a.eye.skywalking.trace.tag.Tags;
-
-/**
- * A Trace contains only one span, which represent a tomcat server side span.
- *
- * Created by wusheng on 2017/2/20.
- */
-public enum SingleTomcat200TraceBuilder implements TraceSegmentBuilder {
-    INSTANCE;
-
-    @Override public TraceSegment build() {
-        Span webSpan = ContextManager.INSTANCE.createSpan("/web/serviceA");
-        {
-            Tags.COMPONENT.set(webSpan, "tomcat");
-            Tags.URL.set(webSpan, "http://10.21.9.35/web/serviceA");
-            Tags.SPAN_KIND.set(webSpan, Tags.SPAN_KIND_SERVER);
-            Tags.STATUS_CODE.set(webSpan, 200);
-        }
-        return null;
-    }
-}
diff --git a/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/span/TomcatSpanGenerator.java b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/span/TomcatSpanGenerator.java
new file mode 100644
index 000000000..c9096cf26
--- /dev/null
+++ b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/span/TomcatSpanGenerator.java
@@ -0,0 +1,53 @@
+package com.a.eye.skywalking.sniffer.mock.trace.builders.span;
+
+import com.a.eye.skywalking.api.context.ContextManager;
+import com.a.eye.skywalking.trace.Span;
+import com.a.eye.skywalking.trace.tag.Tags;
+
+/**
+ * The <code>TomcatSpanGenerator</code> generate all possible spans, by tracing Tomcat.
+ *
+ * Created by wusheng on 2017/2/20.
+ */
+public enum TomcatSpanGenerator {
+    INSTANCE;
+
+    /**
+     * When tomcat response 200.
+     */
+    public void on200(){
+        Span webSpan = ContextManager.INSTANCE.createSpan("/web/serviceA");
+        Tags.COMPONENT.set(webSpan, "tomcat");
+        Tags.URL.set(webSpan, "http://10.21.9.35/web/serviceA");
+        Tags.SPAN_KIND.set(webSpan, Tags.SPAN_KIND_SERVER);
+        Tags.STATUS_CODE.set(webSpan, 200);
+        ContextManager.INSTANCE.stopSpan(webSpan);
+    }
+
+    /**
+     * When tomcat response 404.
+     */
+    public void on404(){
+        Span webSpan = ContextManager.INSTANCE.createSpan("/web/service/unknown");
+        Tags.COMPONENT.set(webSpan, "tomcat");
+        Tags.URL.set(webSpan, "http://10.21.9.35/web/unknown");
+        Tags.SPAN_KIND.set(webSpan, Tags.SPAN_KIND_SERVER);
+        Tags.STATUS_CODE.set(webSpan, 404);
+        Tags.ERROR.set(webSpan,true);
+        ContextManager.INSTANCE.stopSpan(webSpan);
+    }
+
+    /**
+     * When tomcat response 500.
+     */
+    public void on500(){
+        Span webSpan = ContextManager.INSTANCE.createSpan("/web/error/service");
+        Tags.COMPONENT.set(webSpan, "tomcat");
+        Tags.URL.set(webSpan, "http://10.21.9.35/web/error/service");
+        Tags.SPAN_KIND.set(webSpan, Tags.SPAN_KIND_SERVER);
+        Tags.STATUS_CODE.set(webSpan, 500);
+        Tags.ERROR.set(webSpan,true);
+        webSpan.log(new NumberFormatException("Can't convert 'abc' to int."));
+        ContextManager.INSTANCE.stopSpan(webSpan);
+    }
+}
diff --git a/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/trace/SingleTomcat200TraceBuilder.java b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/trace/SingleTomcat200TraceBuilder.java
new file mode 100644
index 000000000..5812b24de
--- /dev/null
+++ b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/trace/SingleTomcat200TraceBuilder.java
@@ -0,0 +1,20 @@
+package com.a.eye.skywalking.sniffer.mock.trace.builders.trace;
+
+import com.a.eye.skywalking.sniffer.mock.context.MockTracerContextListener;
+import com.a.eye.skywalking.sniffer.mock.trace.TraceSegmentBuilder;
+import com.a.eye.skywalking.sniffer.mock.trace.builders.span.TomcatSpanGenerator;
+import com.a.eye.skywalking.trace.TraceSegment;
+
+/**
+ * A Trace contains only one span, which represent a tomcat server side span.
+ *
+ * Created by wusheng on 2017/2/20.
+ */
+public enum SingleTomcat200TraceBuilder implements TraceSegmentBuilder {
+    INSTANCE;
+
+    @Override public TraceSegment build(MockTracerContextListener listener) {
+        TomcatSpanGenerator.INSTANCE.on200();
+        return listener.getFinished(0);
+    }
+}
diff --git a/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/trace/SingleTomcat404TraceBuilder.java b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/trace/SingleTomcat404TraceBuilder.java
new file mode 100644
index 000000000..7ec32e46e
--- /dev/null
+++ b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/trace/SingleTomcat404TraceBuilder.java
@@ -0,0 +1,20 @@
+package com.a.eye.skywalking.sniffer.mock.trace.builders.trace;
+
+import com.a.eye.skywalking.sniffer.mock.context.MockTracerContextListener;
+import com.a.eye.skywalking.sniffer.mock.trace.TraceSegmentBuilder;
+import com.a.eye.skywalking.sniffer.mock.trace.builders.span.TomcatSpanGenerator;
+import com.a.eye.skywalking.trace.TraceSegment;
+
+/**
+ * A Trace contains only one span, which represent a tomcat server side span.
+ *
+ * Created by wusheng on 2017/2/20.
+ */
+public enum SingleTomcat404TraceBuilder implements TraceSegmentBuilder {
+    INSTANCE;
+
+    @Override public TraceSegment build(MockTracerContextListener listener) {
+        TomcatSpanGenerator.INSTANCE.on404();
+        return listener.getFinished(0);
+    }
+}
diff --git a/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/trace/SingleTomcat500TraceBuilder.java b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/trace/SingleTomcat500TraceBuilder.java
new file mode 100644
index 000000000..150c4ab6e
--- /dev/null
+++ b/skywalking-sniffer/skywalking-sniffer-mock/src/main/java/com/a/eye/skywalking/sniffer/mock/trace/builders/trace/SingleTomcat500TraceBuilder.java
@@ -0,0 +1,20 @@
+package com.a.eye.skywalking.sniffer.mock.trace.builders.trace;
+
+import com.a.eye.skywalking.sniffer.mock.context.MockTracerContextListener;
+import com.a.eye.skywalking.sniffer.mock.trace.TraceSegmentBuilder;
+import com.a.eye.skywalking.sniffer.mock.trace.builders.span.TomcatSpanGenerator;
+import com.a.eye.skywalking.trace.TraceSegment;
+
+/**
+ * A Trace contains only one span, which represent a tomcat server side span.
+ *
+ * Created by wusheng on 2017/2/20.
+ */
+public enum SingleTomcat500TraceBuilder implements TraceSegmentBuilder {
+    INSTANCE;
+
+    @Override public TraceSegment build(MockTracerContextListener listener) {
+        TomcatSpanGenerator.INSTANCE.on500();
+        return listener.getFinished(0);
+    }
+}