udp ip null bug fix

Author: gunlee01

pom.xml

@@ -4,7 +4,7 @@
 
     <groupId>scouter.plugin.server</groupId>
     <artifactId>scouter-plugin-server-influxdb</artifactId>
-    <version>1.0.2-SNAPSHOT</version>
+    <version>1.0.3-SNAPSHOT</version>
     <packaging>jar</packaging>
 
     <name>scouter-plugin-server-influxdb</name>

src/main/java/scouter/plugin/server/influxdb/UdpAgent.java

@@ -2,6 +2,7 @@
 
 import scouter.server.Configure;
 import scouter.server.Logger;
+import scouter.util.StringUtil;
 
 import java.io.IOException;
 import java.net.DatagramPacket;
@@ -40,7 +41,7 @@ public void setTarget(String ip, int port) {
 
     public void setLocalAddr(String localIp, int localPort) {
         try {
-            localUdpAddr = localIp;
+            localUdpAddr = StringUtil.isEmpty(localIp) ? null : localIp;
             localUdpPort = localPort;
             openDatagramSocket();
         } catch (Exception e) {