Error on @author tag

Change-Id: I980fd994427d85a0dd30daa3354be52530b3938f
diff --git a/src/main/java/net/onrc/onos/core/packet/ICMP.java b/src/main/java/net/onrc/onos/core/packet/ICMP.java
index c1a0883..846352b 100644
--- a/src/main/java/net/onrc/onos/core/packet/ICMP.java
+++ b/src/main/java/net/onrc/onos/core/packet/ICMP.java
@@ -21,7 +21,7 @@
 
 /**
  * Implements ICMP packet format.
- *
+ * <!-- CHECKSTYLE IGNORE WriteTag FOR NEXT 1 LINES -->
  * @author shudong.zhou@bigswitch.com
  */
 public class ICMP extends BasePacket {
@@ -80,6 +80,7 @@
      * -checksum : 0
      * -length : 0
      */
+    @Override
     public byte[] serialize() {
         int length = 4;
         byte[] payloadData = null;