diff --git a/web/src/main/java/com/navercorp/pinpoint/web/applicationmap/ServerBuilder.java b/web/src/main/java/com/navercorp/pinpoint/web/applicationmap/ServerBuilder.java
index 5ac29c4824df..bade9a8a2288 100644
--- a/web/src/main/java/com/navercorp/pinpoint/web/applicationmap/ServerBuilder.java
+++ b/web/src/main/java/com/navercorp/pinpoint/web/applicationmap/ServerBuilder.java
@@ -37,11 +37,17 @@ public class ServerBuilder {
 
     private final AgentHistogramList agentHistogramList;
     private final Set<AgentInfoBo> agentSet;
-    private MatcherGroup matcherGroup = null;
+    private final MatcherGroup matcherGroup;
+
+    public ServerBuilder() {
+        // TODO FIX
+        this(null);
+    }
 
     public ServerBuilder(MatcherGroup matcherGroup) {
         this.agentHistogramList = new AgentHistogramList();
         this.agentSet = new HashSet<AgentInfoBo>();
+        // TODO avoid null
         this.matcherGroup = matcherGroup;
     }
 
diff --git a/web/src/test/java/com/navercorp/pinpoint/web/applicationmap/ServerInstanceListTest.java b/web/src/test/java/com/navercorp/pinpoint/web/applicationmap/ServerInstanceListTest.java
new file mode 100644
index 000000000000..a9b22e41623d
--- /dev/null
+++ b/web/src/test/java/com/navercorp/pinpoint/web/applicationmap/ServerInstanceListTest.java
@@ -0,0 +1,68 @@
+/*
+ * Copyright 2014 NAVER Corp.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.navercorp.pinpoint.web.applicationmap;
+
+import com.navercorp.pinpoint.common.bo.AgentInfoBo;
+import com.navercorp.pinpoint.common.trace.ServiceType;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+import static org.junit.Assert.*;
+
+/**
+ * @author emeroad
+ */
+public class ServerInstanceListTest {
+
+    @Test
+    public void testGetAgentIdList() throws Exception {
+
+        AgentInfoBo agentInfoBo1 = createAgentInfo("agentId1", "testHost");
+        AgentInfoBo agentInfoBo2 = createAgentInfo("agentId2", "testHost");
+
+        Set<AgentInfoBo> agentInfoBoSet = new HashSet<AgentInfoBo>();
+        agentInfoBoSet.add(agentInfoBo1);
+        agentInfoBoSet.add(agentInfoBo2);
+
+        ServerBuilder builder = new ServerBuilder();
+        builder.addAgentInfo(agentInfoBoSet);
+        ServerInstanceList serverInstanceList = builder.build();
+        List<String> agentIdList = serverInstanceList.getAgentIdList();
+
+        Assert.assertEquals(agentIdList.size(), 2);
+        Assert.assertEquals(agentIdList.get(0), "agentId1");
+        Assert.assertEquals(agentIdList.get(1), "agentId2");
+    }
+
+    public static AgentInfoBo createAgentInfo(String agentId, String hostName) {
+        AgentInfoBo.Builder agentInfoBuilder = new AgentInfoBo.Builder();
+        agentInfoBuilder.setAgentId(agentId);
+
+        ServiceType serviceType = ServiceType.TEST_STAND_ALONE;
+        agentInfoBuilder.setServiceTypeCode(serviceType.getCode());
+        // TODO FIX api
+        agentInfoBuilder.setServiceType(serviceType);
+
+        agentInfoBuilder.setHostName(hostName);
+
+        return agentInfoBuilder.build();
+    }
+}
\ No newline at end of file
diff --git a/web/src/test/java/com/navercorp/pinpoint/web/view/ServerInstanceListSerializerTest.java b/web/src/test/java/com/navercorp/pinpoint/web/view/ServerInstanceListSerializerTest.java
index d4e630242d36..c8f23b77e289 100644
--- a/web/src/test/java/com/navercorp/pinpoint/web/view/ServerInstanceListSerializerTest.java
+++ b/web/src/test/java/com/navercorp/pinpoint/web/view/ServerInstanceListSerializerTest.java
@@ -16,18 +16,18 @@
 
 package com.navercorp.pinpoint.web.view;
 
-import com.navercorp.pinpoint.common.ServiceType;
-import com.navercorp.pinpoint.common.bo.AgentInfoBo;
-import com.navercorp.pinpoint.web.applicationmap.ServerBuilder;
-import com.navercorp.pinpoint.web.applicationmap.ServerInstanceList;
+import java.util.HashSet;
 
-import org.codehaus.jackson.map.ObjectMapper;
-import org.codehaus.jackson.map.ObjectWriter;
+import com.navercorp.pinpoint.web.applicationmap.ServerInstanceListTest;
 import org.junit.Test;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.util.HashSet;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.ObjectWriter;
+import com.navercorp.pinpoint.common.bo.AgentInfoBo;
+import com.navercorp.pinpoint.web.applicationmap.ServerBuilder;
+import com.navercorp.pinpoint.web.applicationmap.ServerInstanceList;
 
 /**
  * @author emeroad
@@ -39,18 +39,15 @@ public class ServerInstanceListSerializerTest {
 
     @Test
     public void testSerialize() throws Exception {
-        AgentInfoBo.Builder agentInfoBuilder = new AgentInfoBo.Builder();
-        agentInfoBuilder.agentId("agentId");
-        agentInfoBuilder.serviceType(ServiceType.TOMCAT);
-        agentInfoBuilder.hostName("testcomputer");
+        AgentInfoBo agentInfoBo = ServerInstanceListTest.createAgentInfo("agentId1", "testHost");
 
-        AgentInfoBo agentInfoBo = agentInfoBuilder.build();
+        HashSet<AgentInfoBo> agentInfoBoSet = new HashSet<AgentInfoBo>();
+        agentInfoBoSet.add(agentInfoBo);
 
-        HashSet<AgentInfoBo> set = new HashSet<AgentInfoBo>();
-        set.add(agentInfoBo);
 
         ServerBuilder builder = new ServerBuilder(null);
-        builder.addAgentInfo(set);
+        builder.addAgentInfo(agentInfoBoSet);
+        
         ServerInstanceList serverInstanceList = builder.build();
         ObjectWriter objectWriter = mapper.writerWithDefaultPrettyPrinter();
         String json = objectWriter.writeValueAsString(serverInstanceList);