Added Link REST and service for active links
diff --git a/src/main/java/net/floodlightcontroller/core/internal/OFSwitchImpl.java b/src/main/java/net/floodlightcontroller/core/internal/OFSwitchImpl.java
index bf5aaf7..5ffd9bc 100644
--- a/src/main/java/net/floodlightcontroller/core/internal/OFSwitchImpl.java
+++ b/src/main/java/net/floodlightcontroller/core/internal/OFSwitchImpl.java
@@ -48,7 +48,7 @@
 import org.codehaus.jackson.annotate.JsonIgnore;
 import org.codehaus.jackson.annotate.JsonProperty;
 import org.codehaus.jackson.map.annotate.JsonSerialize;
-import org.codehaus.jackson.map.ser.ToStringSerializer;
+import org.codehaus.jackson.map.ser.std.ToStringSerializer;
 import org.jboss.netty.channel.Channel;
 import org.openflow.protocol.OFFeaturesReply;
 import org.openflow.protocol.OFFeaturesRequest;