diff --git a/apidb.mv.db b/apidb.mv.db
deleted file mode 100644
index d76c3a8..0000000
Binary files a/apidb.mv.db and /dev/null differ
diff --git a/src/main/java/com/eactive/httpmockserver/ApiController.java b/src/main/java/com/eactive/httpmockserver/ApiController.java
index 090c209..592fa07 100644
--- a/src/main/java/com/eactive/httpmockserver/ApiController.java
+++ b/src/main/java/com/eactive/httpmockserver/ApiController.java
@@ -78,15 +78,15 @@ public class ApiController {
 			int sleepSeconds = api.getSleepSeconds().intValue();
 			if (sleepSeconds > 0) {
 				try {
-					System.out.println("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
-					System.out.println(String.format("Start Sleep %d Seconds.", sleepSeconds));
-					System.out.println("...");
+					logger.debug("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
+					logger.debug("Start Sleep {} Seconds.", sleepSeconds);
+					logger.debug("...");
 					Thread.sleep(sleepSeconds * 1000);
-					System.out.println("......");
-					System.out.println(String.format("Finished Sleep %d Seconds.", sleepSeconds));
-					System.out.println("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
+					logger.debug("......");
+					logger.debug("Finished Sleep {} Seconds.", sleepSeconds);
+					logger.debug("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
 				} catch (InterruptedException e) {
-					e.printStackTrace();
+					logger.error("sleep", e);
 				}
 			}
 		}
@@ -153,7 +153,7 @@ public class ApiController {
 			int length = NumberUtils.toInt(args[1]);
 			String serviceValue = msg.substring(startIdx, startIdx + length);
 			logger.debug("--------------------------------------------------");
-			logger.debug("serviceCode=" + serviceValue);
+			logger.debug("serviceCode={}", serviceValue);
 			logger.debug("==================================================");
 			logger.debug("==================================================");
 			if (StringUtils.isBlank(serviceValue)) {