diff --git a/README.md b/README.md
index 7cc9c1cfb61..422079f6ff7 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ This repository contains source code and design documents for MOSIP ID Authentic
 Refer to [SQL scripts](db_scripts).
 
 ## Build & run (for developers)
-The project requires JDK 1.11. 
+The project requires JDK 1.21. 
 1. Build and install:
     ```
     $ cd kernel
diff --git a/authentication/authentication-common/src/main/java/io/mosip/authentication/common/service/integration/DataShareManager.java b/authentication/authentication-common/src/main/java/io/mosip/authentication/common/service/integration/DataShareManager.java
index 65a648493d4..8192a2d8639 100644
--- a/authentication/authentication-common/src/main/java/io/mosip/authentication/common/service/integration/DataShareManager.java
+++ b/authentication/authentication-common/src/main/java/io/mosip/authentication/common/service/integration/DataShareManager.java
@@ -55,8 +55,11 @@ public <R> R downloadObject(String dataShareUrl, Class<R> clazz, boolean decrypt
 		RestRequestDTO request = restRequestFactory.buildRequest(RestServicesConstants.DATA_SHARE_GET, null, String.class);
 		request.setUri(dataShareUrl);
 		String responseStr = restTemplate.getForObject(dataShareUrl, String.class);
+		if (responseStr == null) {
+			throw new IdAuthUncheckedException(IdAuthenticationErrorConstants.UNABLE_TO_PROCESS.getErrorCode(), IdAuthenticationErrorConstants.UNABLE_TO_PROCESS.getErrorMessage());
+		}
 		Optional<Entry<String, Object>> errorOpt = RestUtil.getError(responseStr, mapper);
-		
+
 		if (errorOpt.isEmpty()) {
 			R result;
 			if (decryptionRequired) {
diff --git a/authentication/authentication-common/src/main/java/io/mosip/authentication/common/service/websub/impl/IdChangeEventsInitializer.java b/authentication/authentication-common/src/main/java/io/mosip/authentication/common/service/websub/impl/IdChangeEventsInitializer.java
index f1f29fa3ac5..2fa3bd6245a 100644
--- a/authentication/authentication-common/src/main/java/io/mosip/authentication/common/service/websub/impl/IdChangeEventsInitializer.java
+++ b/authentication/authentication-common/src/main/java/io/mosip/authentication/common/service/websub/impl/IdChangeEventsInitializer.java
@@ -89,7 +89,6 @@ private void subscribeForCredentialIssueanceEvents(String topicPrefix) {
 				webSubHelper.subscribe(subscriptionRequest);
 				logger.info(IdAuthCommonConstants.SESSION_ID, "subscribeForCredentialIssueanceEvents", "", "Subscribed to topic: " + topic);
 			} catch (Exception e) {
-				e.printStackTrace();
 				logger.info(IdAuthCommonConstants.SESSION_ID, "subscribeForCredentialIssueanceEvents",  e.getClass().toString(), "Error subscribing topic: "+ topic +"\n" + e.getMessage());
 				throw e;
 			}