diff --git a/core/sunbird-es-utils/src/main/java/org/sunbird/common/ElasticSearchRestHighImpl.java b/core/sunbird-es-utils/src/main/java/org/sunbird/common/ElasticSearchRestHighImpl.java
index 2ee3b594..1dee535f 100644
--- a/core/sunbird-es-utils/src/main/java/org/sunbird/common/ElasticSearchRestHighImpl.java
+++ b/core/sunbird-es-utils/src/main/java/org/sunbird/common/ElasticSearchRestHighImpl.java
@@ -59,6 +59,8 @@ public class ElasticSearchRestHighImpl implements ElasticSearchService {
 
   private static final String ERROR = "ERROR";
   private static final LoggerUtil logger = new LoggerUtil(ElasticSearchRestHighImpl.class);
+  private static final int MAX_ES_RESULT_SIZE = 10000;
+  private static final int DEFAULT_ES_RESULT_SIZE = 200;
 
 
   /**
@@ -75,7 +77,7 @@ public Future<String> save(String index, String identifier, Map<String, Object>
     long startTime = System.currentTimeMillis();
     Promise<String> promise = Futures.promise();
 
-    logger.debug(requestContext, "ElasticSearchRestHighImpl:save: method started at ==" + startTime + " for Index " + index);
+    logger.debug(requestContext, "ElasticSearchRestHighImpl:save: method started at =={} for Index {}", startTime, index);
     
     if (StringUtils.isBlank(identifier) || StringUtils.isBlank(index)) {
       logger.info(requestContext, "ElasticSearchRestHighImpl:save: Identifier or Index value is null or empty, identifier : " 
@@ -92,14 +94,14 @@ public Future<String> save(String index, String identifier, Map<String, Object>
       ActionListener<IndexResponse> listener = new ActionListener<IndexResponse>() {
         @Override
         public void onResponse(IndexResponse indexResponse) {
-          logger.info(requestContext, "ElasticSearchRestHighImpl:save: Success for index : " + index + ", identifier :" + identifier);
+          logger.info(requestContext, "ElasticSearchRestHighImpl:save: Success for index : {}, identifier :{}", index, identifier);
           promise.success(indexResponse.getId());
           logEndTime(startTime, index, requestContext);
         }
 
         @Override
         public void onFailure(Exception e) {
-          logger.error(requestContext, "ElasticSearchRestHighImpl:save: Error while saving " + index + " id : " + identifier, e);
+          logger.error(requestContext, "ElasticSearchRestHighImpl:save: Error while saving {} id : {}", index, identifier, e);
           promise.failure(e);
           logEndTime(startTime, index, requestContext);
         }
@@ -131,11 +133,11 @@ public Future<Boolean> update(String index, String identifier, Map<String, Objec
     long startTime = System.currentTimeMillis();
     Promise<Boolean> promise = Futures.promise();
 
-    logger.debug(requestContext, "ElasticSearchRestHighImpl:update: method started at ==" + startTime + " for Index " + index);
+    logger.debug(requestContext, "ElasticSearchRestHighImpl:update: method started at =={} for Index {}", startTime, index);
 
     if (StringUtils.isBlank(index) || StringUtils.isBlank(identifier) || data == null) {
-      logger.info(requestContext, "ElasticSearchRestHighImpl:update: Invalid parameters - index: " + index 
-          + ", identifier: " + identifier + ", data: " + (data == null ? "null" : "present"));
+      logger.info(requestContext, "ElasticSearchRestHighImpl:update: Invalid parameters - index: {}, identifier: {}, data: {}",
+          index, identifier, (data == null ? "null" : "present"));
       promise.failure(ProjectUtil.createClientException(ResponseCode.invalidData));
       return promise.future();
     }
@@ -147,8 +149,7 @@ public Future<Boolean> update(String index, String identifier, Map<String, Objec
       ActionListener<UpdateResponse> listener = new ActionListener<UpdateResponse>() {
         @Override
         public void onResponse(UpdateResponse updateResponse) {
-          logger.info(requestContext, "ElasticSearchRestHighImpl:update: Success with " + updateResponse.getResult()
-              + " response from Elasticsearch for index: " + index + ", identifier: " + identifier);
+          logger.info(requestContext, "ElasticSearchRestHighImpl:update: Success with {} response from Elasticsearch for index: {}, identifier: {}", updateResponse.getResult(), index, identifier);
           promise.success(true);
           logUpdateEndTime(startTime, index, requestContext);
         }
@@ -187,12 +188,11 @@ public Future<Map<String, Object>> getDataByIdentifier(String index, String iden
     long startTime = System.currentTimeMillis();
     Promise<Map<String, Object>> promise = Futures.promise();
 
-    logger.debug(requestContext, "ElasticSearchRestHighImpl:getDataByIdentifier: method started at ==" + startTime 
-        + " for Index " + index);
+    logger.debug(requestContext, "ElasticSearchRestHighImpl:getDataByIdentifier: method started at =={} for Index {}", startTime, index);
 
     if (StringUtils.isBlank(index) || StringUtils.isBlank(identifier)) {
-      logger.info(requestContext, "ElasticSearchRestHighImpl:getDataByIdentifier: Invalid parameters - index: " 
-          + index + ", identifier: " + identifier);
+      logger.info(requestContext, "ElasticSearchRestHighImpl:getDataByIdentifier: Invalid parameters - index: {}, identifier: {}",
+          index, identifier);
       promise.failure(ProjectUtil.createClientException(ResponseCode.invalidData));
       return promise.future();
     }
@@ -256,7 +256,7 @@ public Future<Boolean> delete(String index, String identifier, RequestContext re
     long startTime = System.currentTimeMillis();
     Promise<Boolean> promise = Futures.promise();
 
-    logger.debug(requestContext, "ElasticSearchRestHighImpl:delete: method started at ==" + startTime);
+    logger.debug(requestContext, "ElasticSearchRestHighImpl:delete: method started at =={}", startTime);
 
     if (StringUtils.isBlank(index) || StringUtils.isBlank(identifier)) {
       logger.info(requestContext, "ElasticSearchRestHighImpl:delete: Invalid parameters - index: " 
@@ -319,7 +319,7 @@ public Future<Map<String, Object>> search(SearchDTO searchDTO, String index, Req
     long startTime = System.currentTimeMillis();
     Promise<Map<String, Object>> promise = Futures.promise();
 
-    logger.debug(requestContext, "ElasticSearchRestHighImpl:search: method started at ==" + startTime);
+    logger.debug(requestContext, "ElasticSearchRestHighImpl:search: method started at =={}", startTime);
 
     try {
       SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
@@ -378,10 +378,10 @@ public Future<Map<String, Object>> search(SearchDTO searchDTO, String index, Req
         searchSourceBuilder.from(searchDTO.getOffset());
       }
 
-      // Set limit
-      if (searchDTO.getLimit() != null) {
-        searchSourceBuilder.size(searchDTO.getLimit());
-      }
+      // Set limit with bounds checking
+      int requestedSize = (searchDTO.getLimit() != null && searchDTO.getLimit() > 0)
+          ? searchDTO.getLimit() : DEFAULT_ES_RESULT_SIZE;
+      searchSourceBuilder.size(Math.min(requestedSize, MAX_ES_RESULT_SIZE));
 
       // Apply additional properties
       if (searchDTO.getAdditionalProperties() != null && !searchDTO.getAdditionalProperties().isEmpty()) {
@@ -405,7 +405,7 @@ public Future<Map<String, Object>> search(SearchDTO searchDTO, String index, Req
         searchSourceBuilder = addAggregations(searchSourceBuilder, searchDTO.getFacets(), requestContext);
       }
 
-      logger.info(requestContext, "ElasticSearchRestHighImpl:search: calling search for index " + index 
+      logger.info(requestContext, "ElasticSearchRestHighImpl:search: calling search for index {} 
           + ", with query = " + searchSourceBuilder.toString());
 
       searchRequest.source(searchSourceBuilder);
@@ -429,7 +429,7 @@ public void onResponse(SearchResponse response) {
 
         @Override
         public void onFailure(Exception e) {
-          logger.error(requestContext, "ElasticSearchRestHighImpl:search: Search failed for index: " + index, e);
+          logger.error(requestContext, "ElasticSearchRestHighImpl:search: Search failed for index: {}", index, e);
           promise.failure(e);
           logSearchEndTime(startTime, index, requestContext);
         }
@@ -438,7 +438,7 @@ public void onFailure(Exception e) {
       ConnectionManager.getRestClient().searchAsync(searchRequest, RequestOptions.DEFAULT, listener);
 
     } catch (Exception e) {
-      logger.error(requestContext, "ElasticSearchRestHighImpl:search: Failed to prepare/submit search request for index: " + index, e);
+      logger.error(requestContext, "ElasticSearchRestHighImpl:search: Failed to prepare/submit search request for index: {}", index, e);
       promise.failure(e);
       logSearchEndTime(startTime, index, requestContext);
     }
@@ -464,7 +464,7 @@ public Future<Boolean> healthCheck() {
         @Override
         public void onResponse(Boolean getResponse) {
           promise.success(getResponse != null ? getResponse : false);
-          logger.info("ElasticSearchRestHighImpl:healthCheck: Health check successful, index exists: " + getResponse);
+          logger.info("ElasticSearchRestHighImpl:healthCheck: Health check successful, index exists: {}", getResponse);
         }
 
         @Override
@@ -497,11 +497,11 @@ public Future<Boolean> bulkInsert(String index, List<Map<String, Object>> dataLi
     long startTime = System.currentTimeMillis();
     Promise<Boolean> promise = Futures.promise();
 
-    logger.debug(requestContext, "ElasticSearchRestHighImpl:bulkInsert: method started at ==" + startTime + " for Index " + index);
+    logger.debug(requestContext, "ElasticSearchRestHighImpl:bulkInsert: method started at =={} for Index {}", startTime, index);
 
     if (StringUtils.isBlank(index) || dataList == null || dataList.isEmpty()) {
-      logger.info(requestContext, "ElasticSearchRestHighImpl:bulkInsert: Invalid parameters - index: " + index 
-          + ", dataList size: " + (dataList == null ? "null" : dataList.size()));
+      logger.info(requestContext, "ElasticSearchRestHighImpl:bulkInsert: Invalid parameters - index: {}, dataList size: {}",
+          index, (dataList == null ? "null" : dataList.size()));
       promise.failure(ProjectUtil.createClientException(ResponseCode.invalidData));
       return promise.future();
     }
@@ -545,7 +545,7 @@ public void onResponse(BulkResponse bulkResponse) {
 
         @Override
         public void onFailure(Exception e) {
-          logger.error(requestContext, "ElasticSearchRestHighImpl:bulkInsert: Bulk upload failed for index: " + index, e);
+          logger.error(requestContext, "ElasticSearchRestHighImpl:bulkInsert: Bulk upload failed for index: {}", index, e);
           promise.success(false);
           logBulkInsertEndTime(startTime, index, requestContext);
         }
@@ -554,7 +554,7 @@ public void onFailure(Exception e) {
       ConnectionManager.getRestClient().bulkAsync(request, RequestOptions.DEFAULT, listener);
 
     } catch (Exception e) {
-      logger.error(requestContext, "ElasticSearchRestHighImpl:bulkInsert: Failed to prepare/submit bulk request for index: " + index, e);
+      logger.error(requestContext, "ElasticSearchRestHighImpl:bulkInsert: Failed to prepare/submit bulk request for index: {}", index, e);
       promise.success(false);
       logBulkInsertEndTime(startTime, index, requestContext);
     }
@@ -575,7 +575,7 @@ private static SearchSourceBuilder addAggregations(SearchSourceBuilder searchSou
                                                      List<Map<String, String>> facets, 
                                                      RequestContext requestContext) {
     long startTime = System.currentTimeMillis();
-    logger.debug(requestContext, "ElasticSearchRestHighImpl:addAggregations: method started at ==" + startTime);
+    logger.debug(requestContext, "ElasticSearchRestHighImpl:addAggregations: method started at =={}", startTime);
     
     if (CollectionUtils.isNotEmpty(facets)) {
       Map<String, String> map = facets.get(0);
@@ -614,11 +614,11 @@ public Future<Boolean> upsert(String index, String identifier, Map<String, Objec
     long startTime = System.currentTimeMillis();
     Promise<Boolean> promise = Futures.promise();
 
-    logger.debug(requestContext, "ElasticSearchRestHighImpl:upsert: method started at ==" + startTime + " for Index " + index);
+    logger.debug(requestContext, "ElasticSearchRestHighImpl:upsert: method started at =={} for Index {}", startTime, index);
 
     if (StringUtils.isBlank(index) || StringUtils.isBlank(identifier) || data == null || data.isEmpty()) {
-      logger.info(requestContext, "ElasticSearchRestHighImpl:upsert: Invalid parameters - index: " + index 
-          + ", identifier: " + identifier + ", data: " + (data == null ? "null" : "size=" + data.size()));
+      logger.info(requestContext, "ElasticSearchRestHighImpl:upsert: Invalid parameters - index: {}, identifier: {}, data: {}",
+          index, identifier, (data == null ? "null" : "size=" + data.size()));
       promise.failure(ProjectUtil.createClientException(ResponseCode.invalidData));
       return promise.future();
     }
@@ -672,7 +672,7 @@ public Future<Map<String, Map<String, Object>>> getEsResultByListOfIds(List<Stri
                                                                           String index, RequestContext requestContext) {
     Promise<Map<String, Map<String, Object>>> promise = Futures.promise();
 
-    logger.debug(requestContext, "ElasticSearchRestHighImpl:getEsResultByListOfIds: method started for index " + index);
+    logger.debug(requestContext, "ElasticSearchRestHighImpl:getEsResultByListOfIds: method started for index {}", index);
 
     if (ids == null || ids.isEmpty() || StringUtils.isBlank(index)) {
       logger.info(requestContext, "ElasticSearchRestHighImpl:getEsResultByListOfIds: Invalid parameters - index: " + index 
@@ -704,11 +704,11 @@ public Future<Map<String, Map<String, Object>>> getEsResultByListOfIds(List<Stri
             + resultMap.size() + " documents for index " + index);
       } else {
         promise.success(new HashMap<>());
-        logger.info(requestContext, "ElasticSearchRestHighImpl:getEsResultByListOfIds: No documents found for index " + index);
+        logger.info(requestContext, "ElasticSearchRestHighImpl:getEsResultByListOfIds: No documents found for index {}", index);
       }
 
     } catch (Exception e) {
-      logger.error(requestContext, "ElasticSearchRestHighImpl:getEsResultByListOfIds: Failed to retrieve documents for index: " + index, e);
+      logger.error(requestContext, "ElasticSearchRestHighImpl:getEsResultByListOfIds: Failed to retrieve documents for index: {}", index, e);
       promise.success(new HashMap<>());
     }
 
diff --git a/modules/lms/course-mw/actor-util/src/main/java/org/sunbird/actorutil/systemsettings/impl/SystemSettingClientImpl.java b/modules/lms/course-mw/actor-util/src/main/java/org/sunbird/actorutil/systemsettings/impl/SystemSettingClientImpl.java
index be0015b0..f7c4db55 100644
--- a/modules/lms/course-mw/actor-util/src/main/java/org/sunbird/actorutil/systemsettings/impl/SystemSettingClientImpl.java
+++ b/modules/lms/course-mw/actor-util/src/main/java/org/sunbird/actorutil/systemsettings/impl/SystemSettingClientImpl.java
@@ -6,6 +6,8 @@
 import java.util.HashMap;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.sunbird.actorutil.InterServiceCommunication;
 import org.sunbird.actorutil.InterServiceCommunicationFactory;
 import org.sunbird.actorutil.systemsettings.SystemSettingClient;
@@ -13,13 +15,12 @@
 import org.sunbird.response.Response;
 import org.sunbird.operations.lms.ActorOperations;
 import org.sunbird.keys.JsonKey;
-import org.sunbird.logging.LoggerEnum;
-import org.sunbird.logging.ProjectLogger;
 import org.sunbird.request.Request;
 import org.sunbird.response.ResponseCode;
 import org.sunbird.models.systemsetting.SystemSetting;
 
 public class SystemSettingClientImpl implements SystemSettingClient {
+  private static final Logger logger = LoggerFactory.getLogger(SystemSettingClientImpl.class);
 
   private static InterServiceCommunication interServiceCommunication =
       InterServiceCommunicationFactory.getInstance();
@@ -33,7 +34,7 @@ public static SystemSettingClient getInstance() {
 
   @Override
   public SystemSetting getSystemSettingByField(ActorRef actorRef, String field) {
-    ProjectLogger.log("SystemSettingClientImpl:getSystemSettingByField: field is " + field, LoggerEnum.INFO.name());
+    logger.info("SystemSettingClientImpl:getSystemSettingByField: field is {}", field);
     SystemSetting systemSetting = getSystemSetting(actorRef, JsonKey.FIELD, field);
     return systemSetting;
   }
@@ -53,17 +54,15 @@ public <T> T getSystemSettingByFieldAndKey(
         }
         return (T)objectMapper.convertValue(valueMap.get(keys[numKeys - 1]), typeReference);
       } catch (Exception e) {
-        ProjectLogger.log(
-            "SystemSettingClientImpl:getSystemSettingByFieldAndKey: Exception occurred with error message = "
-                + e.getMessage(),
-            LoggerEnum.ERROR.name());
+        logger.error("SystemSettingClientImpl:getSystemSettingByFieldAndKey: Exception occurred with error message = {}", 
+            e.getMessage(), e);
       }
     }
     return null;
   }
 
   private SystemSetting getSystemSetting(ActorRef actorRef, String param, Object value) {
-    ProjectLogger.log("SystemSettingClientImpl: getSystemSetting called", LoggerEnum.DEBUG);
+    logger.debug("SystemSettingClientImpl: getSystemSetting called");
     Request request = new Request();
     Map<String, Object> map = new HashMap<>();
     map.put(param, value);
diff --git a/modules/lms/course-mw/actor-util/src/main/java/org/sunbird/actorutil/user/impl/UserClientImpl.java b/modules/lms/course-mw/actor-util/src/main/java/org/sunbird/actorutil/user/impl/UserClientImpl.java
index 2999eb62..f5582cdc 100644
--- a/modules/lms/course-mw/actor-util/src/main/java/org/sunbird/actorutil/user/impl/UserClientImpl.java
+++ b/modules/lms/course-mw/actor-util/src/main/java/org/sunbird/actorutil/user/impl/UserClientImpl.java
@@ -10,14 +10,14 @@
 import org.sunbird.common.factory.EsClientFactory;
 import org.sunbird.common.inf.ElasticSearchService;
 import org.sunbird.response.Response;
-import org.sunbird.logging.ProjectLogger;
-import org.sunbird.logging.LoggerEnum;
 import org.sunbird.keys.JsonKey;
 import org.sunbird.common.ProjectUtil;
 import org.sunbird.operations.lms.ActorOperations;
 import org.sunbird.request.Request;
 import org.sunbird.response.ResponseCode;
 import org.sunbird.dto.SearchDTO;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import scala.concurrent.Future;
 
 import java.text.MessageFormat;
@@ -28,18 +28,19 @@
 
 public class UserClientImpl implements UserClient {
 
+  private static final Logger logger = LoggerFactory.getLogger(UserClientImpl.class);
   private static InterServiceCommunication interServiceCommunication = InterServiceCommunicationFactory.getInstance();
   private ElasticSearchService esUtil = EsClientFactory.getInstance();
 
   @Override
   public String createUser(ActorRef actorRef, Map<String, Object> userMap) {
-    ProjectLogger.log("UserClientImpl: createUser called", LoggerEnum.INFO);
+    logger.info("UserClientImpl: createUser called");
     return upsertUser(actorRef, userMap, ActorOperations.CREATE_USER.getValue());
   }
 
   @Override
   public void updateUser(ActorRef actorRef, Map<String, Object> userMap) {
-    ProjectLogger.log("UserClientImpl: updateUser called", LoggerEnum.INFO);
+    logger.info("UserClientImpl: updateUser called");
     upsertUser(actorRef, userMap, ActorOperations.UPDATE_USER.getValue());
   }
 
diff --git a/modules/lms/course-mw/course-actors-common/src/main/java/org/sunbird/learner/actors/cache/CacheManagementActor.java b/modules/lms/course-mw/course-actors-common/src/main/java/org/sunbird/learner/actors/cache/CacheManagementActor.java
index ce569355..eedbe0c6 100644
--- a/modules/lms/course-mw/course-actors-common/src/main/java/org/sunbird/learner/actors/cache/CacheManagementActor.java
+++ b/modules/lms/course-mw/course-actors-common/src/main/java/org/sunbird/learner/actors/cache/CacheManagementActor.java
@@ -8,7 +8,6 @@
 import org.sunbird.keys.JsonKey;
 import org.sunbird.logging.LoggerEnum;
 import org.sunbird.logging.LoggerUtil;
-import org.sunbird.logging.ProjectLogger;
 import org.sunbird.request.Request;
 import org.sunbird.response.ResponseCode;
 
@@ -17,8 +16,8 @@ public class CacheManagementActor extends BaseActor {
 
   @Override
   public void onReceive(Request request) throws Throwable {
-    System.out.println(
-        "Actor dispatcher parent=>" + getContext().getParent().path() + ", self=>" + self().path());
+    logger.debug(request.getRequestContext(), "Actor dispatcher parent=>{}, self=>{}", 
+        getContext().getParent().path(), self().path());
     if (request.getOperation().equalsIgnoreCase(ActorOperations.CLEAR_CACHE.getValue())) {
       clearCache(request);
     } else {
@@ -28,7 +27,7 @@ public void onReceive(Request request) throws Throwable {
 
   private void clearCache(Request request) {
     String mapName = (String) request.getContext().get(JsonKey.MAP_NAME);
-    logger.info(request.getRequestContext(), "CacheManagementActor:clearCache: mapName = " + mapName);
+    logger.info(request.getRequestContext(), "CacheManagementActor:clearCache: mapName = {}", mapName);
     try {
       if (!JsonKey.ALL.equals(mapName)) {
         cache.clear(mapName);
@@ -41,8 +40,8 @@ private void clearCache(Request request) {
 
       sender().tell(response, self());
     } catch (Exception e) {
-      logger.error(request.getRequestContext(), "CacheManagementActor:clearCache: Error occurred for mapName = "
-              + mapName + " error = " + e.getMessage(), e);
+      logger.error(request.getRequestContext(), "CacheManagementActor:clearCache: Error occurred for mapName = {} error = {}", 
+              mapName, e.getMessage(), e);
       sender().tell(e, self());
     }
   }
diff --git a/modules/lms/course-mw/course-actors-common/src/main/java/org/sunbird/learner/util/SearchTelemetryUtil.java b/modules/lms/course-mw/course-actors-common/src/main/java/org/sunbird/learner/util/SearchTelemetryUtil.java
index 224768ac..efbdf0cc 100644
--- a/modules/lms/course-mw/course-actors-common/src/main/java/org/sunbird/learner/util/SearchTelemetryUtil.java
+++ b/modules/lms/course-mw/course-actors-common/src/main/java/org/sunbird/learner/util/SearchTelemetryUtil.java
@@ -4,8 +4,9 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.sunbird.keys.JsonKey;
-import org.sunbird.logging.ProjectLogger;
 import org.sunbird.common.PropertiesCache;
 import org.sunbird.request.Request;
 import org.sunbird.dto.SearchDTO;
@@ -13,6 +14,8 @@
 import org.sunbird.telemetry.util.TelemetryWriter;
 
 public class SearchTelemetryUtil {
+  private static final Logger logger = LoggerFactory.getLogger(SearchTelemetryUtil.class);
+  
   private SearchTelemetryUtil() {}
 
   public static void generateSearchTelemetryEvent(
@@ -30,7 +33,7 @@ public static void generateSearchTelemetryEvent(
       request.setRequest(telemetryRequestForSearch(context, params));
       TelemetryWriter.write(request);
     } catch (Exception e) {
-      ProjectLogger.log(e.getMessage(), e);
+      logger.error("Error in generateSearchTelemetryEvent", e);
     }
   }
 
diff --git a/modules/lms/service/app/controllers/collectionsummaryaggregate/CollectionSummaryAggregateController.java b/modules/lms/service/app/controllers/collectionsummaryaggregate/CollectionSummaryAggregateController.java
index ae64e282..13d95b15 100644
--- a/modules/lms/service/app/controllers/collectionsummaryaggregate/CollectionSummaryAggregateController.java
+++ b/modules/lms/service/app/controllers/collectionsummaryaggregate/CollectionSummaryAggregateController.java
@@ -5,6 +5,8 @@
 import controllers.collectionsummaryaggregate.validator.Validator;
 import org.sunbird.operations.lms.ActorOperations;
 import org.sunbird.request.Request;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import play.mvc.Http;
 import play.mvc.Result;
 
@@ -13,6 +15,7 @@
 import java.util.concurrent.CompletionStage;
 
 public class CollectionSummaryAggregateController extends BaseController {
+    private static final Logger logger = LoggerFactory.getLogger(CollectionSummaryAggregateController.class);
 
     @Inject
     @Named("collection-summary-aggregate-actor")
@@ -25,7 +28,7 @@ public CompletionStage<Result> getCollectionSummaryAggregate(Http.Request httpRe
                 httpRequest.body().asJson(),
                 (req) -> {
                     Request request = (Request) req;
-                    System.out.println("Validation Request Obj" + request);
+                    logger.debug("Validation Request Obj {}", request);
                     new Validator().validate(request);
                     return null;
                 },
diff --git a/modules/lms/service/app/modules/ActorStartModule.java b/modules/lms/service/app/modules/ActorStartModule.java
index dc022bf5..3004d0b8 100644
--- a/modules/lms/service/app/modules/ActorStartModule.java
+++ b/modules/lms/service/app/modules/ActorStartModule.java
@@ -3,14 +3,17 @@
 import org.apache.pekko.routing.FromConfig;
 import org.apache.pekko.routing.RouterConfig;
 import com.google.inject.AbstractModule;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import play.libs.pekko.PekkoGuiceSupport;
 import util.ACTOR_NAMES;
 
 public class ActorStartModule extends AbstractModule implements PekkoGuiceSupport {
+  private static final Logger logger = LoggerFactory.getLogger(ActorStartModule.class);
 
   @Override
   protected void configure() {
-    System.out.println("binding actors for dependency injection");
+    logger.info("binding actors for dependency injection");
     final RouterConfig config = new FromConfig();
     for (ACTOR_NAMES actor : ACTOR_NAMES.values()) {
       bindActor(
@@ -20,6 +23,6 @@ protected void configure() {
             return props.withRouter(config);
           });
     }
-    System.out.println("binding completed");
+    logger.info("binding completed");
   }
 }
diff --git a/modules/lms/service/app/modules/ApplicationStart.java b/modules/lms/service/app/modules/ApplicationStart.java
index 5e998ee1..4c9eed69 100644
--- a/modules/lms/service/app/modules/ApplicationStart.java
+++ b/modules/lms/service/app/modules/ApplicationStart.java
@@ -7,6 +7,8 @@
 import org.sunbird.learner.util.ContentSearchMock;
 import org.sunbird.learner.util.SchedulerManager;
 import org.sunbird.learner.util.Util;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import play.api.Environment;
 import play.api.inject.ApplicationLifecycle;
 
@@ -26,6 +28,7 @@ public class ApplicationStart {
   public static ProjectUtil.Environment env;
   public static String ssoPublicKey = "";
   public LoggerUtil logger = new LoggerUtil(this.getClass());
+  private static final Logger slf4jLogger = LoggerFactory.getLogger(ApplicationStart.class);
 
   /**
    * All one time initialization which required during server startup will fall here.
@@ -35,7 +38,7 @@ public class ApplicationStart {
    */
   @Inject
   public ApplicationStart(ApplicationLifecycle lifecycle, Environment environment) {
-    System.out.println("ApplicationStart:ApplicationStart: Start");
+    slf4jLogger.info("ApplicationStart:ApplicationStart: Start");
     setEnvironment(environment);
     ssoPublicKey = System.getenv(JsonKey.SSO_PUBLIC_KEY);
     logger.info("Server started.. with environment: " + env.name());
@@ -48,18 +51,18 @@ public ApplicationStart(ApplicationLifecycle lifecycle, Environment environment)
         () -> {
           return CompletableFuture.completedFuture(null);
         });
-    System.out.println("keymanger.init():starts");
+    slf4jLogger.info("keymanger.init():starts");
     KeyManager.init();
-    System.out.println("ApplicationStart:ApplicationStart: End");
+    slf4jLogger.info("ApplicationStart:ApplicationStart: End");
   }
 
   public static void mockServiceSetup() {
     LoggerUtil logger = new LoggerUtil(ApplicationStart.class);
-      try {
-        ContentSearchMock.setup();
-      } catch (Exception e) {
-        logger.info((org.sunbird.request.RequestContext) null,"Error setting up ContentSearchMock:"+e);
-      }
+    try {
+      ContentSearchMock.setup();
+    } catch (Exception e) {
+      logger.info((org.sunbird.request.RequestContext) null, "Error setting up ContentSearchMock: {}", e.getMessage(), e);
+    }
   }
 
   private void checkCassandraConnections() {
diff --git a/modules/lms/service/app/modules/StartModule.java b/modules/lms/service/app/modules/StartModule.java
index 98205329..266bb47e 100644
--- a/modules/lms/service/app/modules/StartModule.java
+++ b/modules/lms/service/app/modules/StartModule.java
@@ -1,6 +1,8 @@
 package modules;
 
 import com.google.inject.AbstractModule;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.sunbird.cache.util.RedisCacheUtil;
 
 /**
@@ -10,9 +12,11 @@
  * @author Jaikumar Soundara Rajan
  */
 public class StartModule extends AbstractModule {
+    private static final Logger logger = LoggerFactory.getLogger(StartModule.class);
+
     @Override
     protected void configure() {
-        System.out.println("StartModule:configure: Start");
+        logger.info("StartModule:configure: Start");
         try {
             bind(ApplicationStart.class).asEagerSingleton();
             bind(RedisCacheUtil.class).asEagerSingleton();
@@ -20,7 +24,7 @@ protected void configure() {
             e.printStackTrace();
             throw e;
         }
-        System.out.println("StartModule:configure: End");
+        logger.info("StartModule:configure: End");
 
     }
 }
diff --git a/modules/userorg/controller/app/util/RequestInterceptor.java b/modules/userorg/controller/app/util/RequestInterceptor.java
index 54ac64bb..a886962c 100644
--- a/modules/userorg/controller/app/util/RequestInterceptor.java
+++ b/modules/userorg/controller/app/util/RequestInterceptor.java
@@ -121,7 +121,7 @@ private static String getUserRequestedFor(Http.Request request) {
         }
       }
     } catch (Exception e) {
-      logger.error("Likely a possibility? " + request.uri(), e);
+      logger.error("Likely a possibility? {}", request.uri(), e);
     }
     return requestedForUserID;
   }
@@ -170,7 +170,7 @@ public static Map verifyRequestData(Http.Request request, Map<String, Object> re
         userAuthentication.put(JsonKey.USER_ID, clientId);
         userAuthentication.put(JsonKey.MANAGED_FOR, managedForId);
       } else {
-        logger.info("Token not present in request: " + request.getHeaders().toMap());
+        logger.info("Token not present in request: {}", request.getHeaders().toMap());
       }
     } else {
       if (accessToken.isPresent()) {