diff --git a/src/main/java/com/nhn/pinpoint/collector/monitor/AgentStatStore.java b/src/main/java/com/nhn/pinpoint/collector/monitor/AgentStatStore.java
index 184a406f1..4227f5341 100644
--- a/src/main/java/com/nhn/pinpoint/collector/monitor/AgentStatStore.java
+++ b/src/main/java/com/nhn/pinpoint/collector/monitor/AgentStatStore.java
@@ -11,8 +11,8 @@ public interface AgentStatStore {
 	
 	AgentStat get(String agentId);
 
+	String getInJson();
+	
 	String getInJson(String agentId);
-
-	String toJson();
 	
 }
diff --git a/src/main/java/com/nhn/pinpoint/collector/monitor/AgentStatSupport.java b/src/main/java/com/nhn/pinpoint/collector/monitor/AgentStatSupport.java
index 20a5fe9db..32da3f5f6 100644
--- a/src/main/java/com/nhn/pinpoint/collector/monitor/AgentStatSupport.java
+++ b/src/main/java/com/nhn/pinpoint/collector/monitor/AgentStatSupport.java
@@ -6,6 +6,12 @@ import com.nhn.pinpoint.common.dto2.thrift.StatWithG1Collector;
 import com.nhn.pinpoint.common.dto2.thrift.StatWithParallelCollector;
 import com.nhn.pinpoint.common.dto2.thrift.AgentStat._Fields;
 
+/**
+ * AgentStat 메시지에서 agentId, timestamp 등의 공통 정보를 꺼내올 수 있는 유틸리티.
+ * AgentStat에 포함될 struct들이 agentId, timestamp 필드를 가지고 있다고 가정한다.
+ * 
+ * @author harebox
+ */
 public class AgentStatSupport {
 
 	public static String getAgentId(AgentStat agentStat) {
diff --git a/src/main/java/com/nhn/pinpoint/collector/monitor/DefaultAgentStatStore.java b/src/main/java/com/nhn/pinpoint/collector/monitor/DefaultAgentStatStore.java
index 8d1a60da2..d6b4c3e74 100644
--- a/src/main/java/com/nhn/pinpoint/collector/monitor/DefaultAgentStatStore.java
+++ b/src/main/java/com/nhn/pinpoint/collector/monitor/DefaultAgentStatStore.java
@@ -6,22 +6,26 @@ import java.util.concurrent.ConcurrentHashMap;
 import org.codehaus.jackson.map.ObjectMapper;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
 
 import com.nhn.pinpoint.common.dto2.thrift.AgentStat;
 
 /**
- * 
+ * 테스트를 위해 메모리에 (AgentId -> AgentStat) 맵을 캐싱해둔다. 
  * @author harebox
  */
 public class DefaultAgentStatStore implements AgentStatStore {
 
 	private final Logger logger = LoggerFactory.getLogger(this.getClass());
 	
+	@Autowired
+	@Qualifier("jsonObjectMapper")
+	private ObjectMapper jsonObjectMapper;
+	
 	// in-memory storage
 	private Map<String, AgentStat> map = new ConcurrentHashMap<String, AgentStat>();
 	
-	private ObjectMapper jsonMapper = new ObjectMapper();
-
 	public void store(AgentStat agentStat) {
 		String agentId = AgentStatSupport.getAgentId(agentStat);
 		
@@ -43,7 +47,7 @@ public class DefaultAgentStatStore implements AgentStatStore {
 			AgentStat agentStat = map.get(agentId);
 			if (agentStat != null) {
 				Object typeObject = agentStat.getFieldValue(agentStat.getSetField());
-				result = jsonMapper.writeValueAsString(typeObject);
+				result = jsonObjectMapper.writeValueAsString(typeObject);
 			}
 		} catch (Exception e) {
 			logger.error("failed to serialze the object to JSON : {}", e.getMessage());
@@ -51,7 +55,7 @@ public class DefaultAgentStatStore implements AgentStatStore {
 		return result;
 	}
 	
-	public String toJson() {
+	public String getInJson() {
 		StringBuilder sb = new StringBuilder();
 		sb.append("{");
 		sb.append("\"agentId\"").append(" : ").append("\"").append(map.keySet().toString()).append("\"");
diff --git a/src/main/java/com/nhn/pinpoint/collector/monitor/servlet/AgentStatServlet.java b/src/main/java/com/nhn/pinpoint/collector/monitor/servlet/AgentStatServlet.java
index 143a04e40..74e13a0f1 100644
--- a/src/main/java/com/nhn/pinpoint/collector/monitor/servlet/AgentStatServlet.java
+++ b/src/main/java/com/nhn/pinpoint/collector/monitor/servlet/AgentStatServlet.java
@@ -62,7 +62,7 @@ public class AgentStatServlet extends HttpServlet {
 				jsonpCallback(req, res, "{\"error\": \"not found : " + agentId + "\"}");
 			}
 		} else {
-			jsonpCallback(req, res, statServer.getStore().toJson());
+			jsonpCallback(req, res, statServer.getStore().getInJson());
 		}
 	}
 
diff --git a/src/main/resources/applicationContext.xml b/src/main/resources/applicationContext.xml
index 9156762e9..ab07c7f74 100644
--- a/src/main/resources/applicationContext.xml
+++ b/src/main/resources/applicationContext.xml
@@ -74,4 +74,7 @@
     <bean id="udpReceiver" class="com.nhn.pinpoint.collector.receiver.udp.UDPReceiver">
     </bean>
     
+    <bean id="jsonObjectMapper" class="org.codehaus.jackson.map.ObjectMapper">
+    </bean>
+    
 </beans>
\ No newline at end of file