Fixing https://github.com/wso2/product-iots/issues/353.

components/device-mgt/org.wso2.carbon.device.mgt.api/src/main/java/org/wso2/carbon/device/mgt/jaxrs/service/impl/RoleManagementServiceImpl.java

@@ -30,6 +30,7 @@ import org.wso2.carbon.device.mgt.jaxrs.beans.RoleList;
 import org.wso2.carbon.device.mgt.jaxrs.service.api.RoleManagementService;
 import org.wso2.carbon.device.mgt.jaxrs.service.impl.util.FilteringUtil;
 import org.wso2.carbon.device.mgt.jaxrs.service.impl.util.RequestValidationUtil;
+import org.wso2.carbon.device.mgt.jaxrs.util.Constants;
 import org.wso2.carbon.device.mgt.jaxrs.util.DeviceMgtAPIUtils;
 import org.wso2.carbon.device.mgt.jaxrs.util.SetReferenceTransformer;
 import org.wso2.carbon.registry.api.Registry;
@@ -68,6 +69,9 @@ public class RoleManagementServiceImpl implements RoleManagementService {
             @HeaderParam("If-Modified-Since") String ifModifiedSince,
             @QueryParam("offset") int offset, @QueryParam("limit") int limit) {
         RequestValidationUtil.validatePaginationParameters(offset, limit);
+        if (limit == 0){
+            limit = Constants.DEFAULT_PAGE_LIMIT;
+        }
         List<String> filteredRoles;
         RoleList targetRoles = new RoleList();
 

components/device-mgt/org.wso2.carbon.device.mgt.api/src/main/java/org/wso2/carbon/device/mgt/jaxrs/service/impl/UserManagementServiceImpl.java

@@ -363,7 +363,9 @@ public class UserManagementServiceImpl implements UserManagementService {
         }
 
         RequestValidationUtil.validatePaginationParameters(offset, limit);
-
+        if (limit == 0){
+            limit = Constants.DEFAULT_PAGE_LIMIT;
+        }
         List<BasicUserInfo> userList, offsetList;
         String appliedFilter = ((filter == null) || filter.isEmpty() ? "*" : filter + "*");
         // to get whole set of users, appliedLimit is set to -1

components/device-mgt/org.wso2.carbon.device.mgt.api/src/main/java/org/wso2/carbon/device/mgt/jaxrs/util/Constants.java

@@ -30,6 +30,7 @@ public class Constants {
     public static final String DEFAULT_STREAM_VERSION = "1.0.0";
 	public static final String SCOPE = "scope";
 	public static final String JDBC_USERSTOREMANAGER = "org.wso2.carbon.user.core.jdbc.JDBCUserStoreManager";
+	public static final int DEFAULT_PAGE_LIMIT = 10;
 
 
 	public final class ErrorMessages {