diff --git a/skywalking-network/src/main/proto/Spans.proto b/skywalking-network/src/main/proto/Spans.proto
index 23d3373e7..df535d40b 100644
--- a/skywalking-network/src/main/proto/Spans.proto
+++ b/skywalking-network/src/main/proto/Spans.proto
@@ -42,7 +42,7 @@ message TraceId {
 message Span {
     TraceId traceId = 1;
     string parentLevelId=2;
-    int32 levelId = 3; // parentLevelId + "." + levelId
+    int32 levelId = 3; 
     string viewpoint = 4;
     int64 startTime = 5;
     int64 cost = 6;
diff --git a/skywalking-sniffer/skywalking-agent/dependency-reduced-pom.xml b/skywalking-sniffer/skywalking-agent/dependency-reduced-pom.xml
index 02f4f3db5..a597e2a39 100644
--- a/skywalking-sniffer/skywalking-agent/dependency-reduced-pom.xml
+++ b/skywalking-sniffer/skywalking-agent/dependency-reduced-pom.xml
@@ -67,13 +67,35 @@
     </dependency>
     <dependency>
       <groupId>org.mockito</groupId>
-      <artifactId>mockito-core</artifactId>
+      <artifactId>mockito-all</artifactId>
       <version>1.10.19</version>
       <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.powermock</groupId>
+      <artifactId>powermock-module-junit4</artifactId>
+      <version>1.6.4</version>
+      <scope>test</scope>
       <exclusions>
         <exclusion>
-          <artifactId>objenesis</artifactId>
-          <groupId>org.objenesis</groupId>
+          <artifactId>powermock-module-junit4-common</artifactId>
+          <groupId>org.powermock</groupId>
+        </exclusion>
+      </exclusions>
+    </dependency>
+    <dependency>
+      <groupId>org.powermock</groupId>
+      <artifactId>powermock-api-mockito</artifactId>
+      <version>1.6.4</version>
+      <scope>test</scope>
+      <exclusions>
+        <exclusion>
+          <artifactId>mockito-core</artifactId>
+          <groupId>org.mockito</groupId>
+        </exclusion>
+        <exclusion>
+          <artifactId>powermock-api-support</artifactId>
+          <groupId>org.powermock</groupId>
         </exclusion>
         <exclusion>
           <artifactId>hamcrest-core</artifactId>