diff --git a/src/main/java/com/eactive/eai/adapter/service/ApiAdapterService.java b/src/main/java/com/eactive/eai/adapter/service/ApiAdapterService.java
index a70dbd5..1f7be85 100644
--- a/src/main/java/com/eactive/eai/adapter/service/ApiAdapterService.java
+++ b/src/main/java/com/eactive/eai/adapter/service/ApiAdapterService.java
@@ -346,7 +346,7 @@ public class ApiAdapterService extends HttpAdapterServiceSupport {
     
     // jwhong decrypt
 
-    private String doPreDecryption(String eaiBody, Properties transactionProp, HttpServletRequest request) {
+    private String doPreDecryption(String eaiBody, Properties transactionProp, HttpServletRequest request) throws Exception {
     	String decryptAlgorithm = transactionProp.getProperty(ENCRYPT_ALGORITHM, "");
     	String xElinkClientId = transactionProp.getProperty(HEADER_NAME_CLIENT_ID, "");   // 이 값이 OAuth의 client id 값이다 . http header 에 포함되어 온다. jwhong
 		String encryptBaseKeyType = transactionProp.getProperty(ENCRYPT_BASE_TYPE);   
@@ -381,6 +381,11 @@ public class ApiAdapterService extends HttpAdapterServiceSupport {
     	byte[] decryptedMessage = null;
     	decryptedMessage = doInboundPreDecrypt(eaiBody, decryptAlgorithm,clientSecret,secretAES256Iv, secretAES256Key );
     	
+		if (decryptedMessage == null) {   
+			throw new Exception("[HttpClient5AdapterServiceRest] Decrypt Error : Invalid encrypted message");
+		}
+    	
+    	
     	String resultMessage = new String(decryptedMessage, StandardCharsets.UTF_8 );
     	return resultMessage;
     	//return new String(decryptedMessage, StandardCharsets.UTF_8 );
@@ -453,25 +458,28 @@ public class ApiAdapterService extends HttpAdapterServiceSupport {
  	}
  	
  	
- 	private byte[] doInboundPreDecrypt(String eaiStringBody, String decryptAlgorithm, String clientSecretKey, String secretAES256Iv, String secretAES256Key) {
+ 	private byte[] doInboundPreDecrypt(String eaiStringBody, String decryptAlgorithm, String clientSecretKey, String secretAES256Iv, String secretAES256Key) throws Exception {
  	      
  		byte[] decryptedMessage = null;
  		//String eaiStringBody = new String(eaiBody, StandardCharsets.UTF_8);
  		
  		eaiStringBody = extractBodyMsg(decryptAlgorithm, eaiStringBody);
  		
+		if (eaiStringBody == null) {   
+			throw new Exception("[HttpClient5AdapterServiceRest] Cannot decrypt Error : input is plain text");
+		}
+ 		
  		//test source
- 		//System.out.println("eaiBody 바이트 배열 길이: " + eaiBody.length);
- 		System.out.println("Base64 문자열: " + eaiStringBody);
- 		System.out.println("Base64 문자열 길이: " + eaiStringBody.length());
- 		System.out.println("Base64 문자열 끝: " + eaiStringBody.substring(eaiStringBody.length() - 10));
+ 		logger.debug("Base64 문자열: " + eaiStringBody);
+ 		logger.debug("Base64 문자열 길이: " + eaiStringBody.length());
+ 		logger.debug("Base64 문자열 끝: " + eaiStringBody.substring(eaiStringBody.length() - 10));
 
  		// Base64 디코딩 테스트
  		try {
  		    byte[] decoded = Base64.getDecoder().decode(eaiStringBody);
- 		    System.out.println("디코딩 성공, 길이: " + decoded.length);
+ 		    logger.debug("디코딩 성공, 길이: " + decoded.length);
  		} catch (IllegalArgumentException e) {
- 		    System.out.println("Base64 디코딩 실패: " + e.getMessage());
+ 		    logger.debug("Base64 디코딩 실패: " + e.getMessage());
  		}
          // end test source
  	
@@ -586,12 +594,12 @@ public class ApiAdapterService extends HttpAdapterServiceSupport {
 		try {
 			JSONParser parser = new JSONParser();
 			JSONObject jsonObject = (JSONObject) parser.parse(eaiStringBody);
-			decryptedBodyMessage = (String) jsonObject.get(decryptedJsonKey);		
+			decryptedBodyMessage = (String) jsonObject.get(decryptedJsonKey);	
 		} catch (Exception e) {
 	        e.printStackTrace();
 	        logger.error("HttpClient5AdapterServiceRest] extractBodyMsg error : " + e.getMessage());
 		}
-
+	
 		return decryptedBodyMessage;
 		
 	}
@@ -602,17 +610,16 @@ public class ApiAdapterService extends HttpAdapterServiceSupport {
  		//String eaiStringBody = new String(eaiBody, StandardCharsets.UTF_8);
  		
  		//test source
- 		//System.out.println("eaiBody 바이트 배열 길이: " + eaiBody.length);
- 		System.out.println("Base64 문자열: " + eaiStringBody);
- 		System.out.println("Base64 문자열 길이: " + eaiStringBody.length());
- 		System.out.println("Base64 문자열 끝: " + eaiStringBody.substring(eaiStringBody.length() - 10));
+ 		logger.debug("Base64 문자열: " + eaiStringBody);
+ 		logger.debug("Base64 문자열 길이: " + eaiStringBody.length());
+ 		logger.debug("Base64 문자열 끝: " + eaiStringBody.substring(eaiStringBody.length() - 10));
 
  		// Base64 디코딩 테스트
  		try {
  		    byte[] decoded = Base64.getDecoder().decode(eaiStringBody);
- 		    System.out.println("디코딩 성공, 길이: " + decoded.length);
+ 		   logger.debug("디코딩 성공, 길이: " + decoded.length);
  		} catch (IllegalArgumentException e) {
- 		    System.out.println("Base64 디코딩 실패: " + e.getMessage());
+ 			logger.debug("Base64 디코딩 실패: " + e.getMessage());
  		}
          // end test source
  	
@@ -705,7 +712,7 @@ public class ApiAdapterService extends HttpAdapterServiceSupport {
 			logger.error(e.getMessage());
 		}
  		
- 		System.out.println("Token is: " + Token);
+ 		logger.debug("Token is: " + Token);
  		return Token;
 
  	}
@@ -721,7 +728,7 @@ public class ApiAdapterService extends HttpAdapterServiceSupport {
 			tokenClientId = "";
 		}
  		
- 		System.out.println("Token Client ID: " + tokenClientId);
+ 		logger.debug("Token Client ID: " + tokenClientId);
  		return tokenClientId;
 
  	}