Adding temporary development code bits for dashboard analytics feature

components/device-mgt/org.wso2.carbon.device.mgt.analytics.dashboard/pom.xml

@@ -63,7 +63,8 @@
                             org.wso2.carbon.device.mgt.analytics.dashboard.internal
                         </Private-Package>
                         <Export-Package>
-                            org.wso2.carbon.device.mgt.analytics.dashboard
+                            org.wso2.carbon.device.mgt.analytics.dashboard,
+                            org.wso2.carbon.device.mgt.analytics.dashboard.dao.exception
                         </Export-Package>
                         <Import-Package>
                             org.osgi.framework,

components/device-mgt/org.wso2.carbon.device.mgt.analytics.dashboard/src/main/java/org/wso2/carbon/device/mgt/analytics/dashboard/GadgetDataService.java

@@ -18,9 +18,11 @@
 
 package org.wso2.carbon.device.mgt.analytics.dashboard;
 
+import org.wso2.carbon.device.mgt.analytics.dashboard.dao.exception.InvalidParameterException;
 import org.wso2.carbon.device.mgt.common.PaginationRequest;
 import org.wso2.carbon.device.mgt.common.PaginationResult;
 
+import java.sql.SQLException;
 import java.util.List;
 import java.util.Map;
 
@@ -30,61 +32,62 @@ import java.util.Map;
 public interface GadgetDataService {
 
     @SuppressWarnings("unused")
-    int getTotalDeviceCount() throws GadgetDataServiceException;
+    int getTotalDeviceCount() throws SQLException;
 
     @SuppressWarnings("unused")
-    int getActiveDeviceCount() throws GadgetDataServiceException;
+    int getActiveDeviceCount() throws SQLException;
 
     @SuppressWarnings("unused")
-    int getInactiveDeviceCount() throws GadgetDataServiceException;
+    int getInactiveDeviceCount() throws SQLException;
 
     @SuppressWarnings("unused")
-    int getRemovedDeviceCount() throws GadgetDataServiceException;
+    int getRemovedDeviceCount() throws SQLException;
 
     @SuppressWarnings("unused")
-    int getNonCompliantDeviceCount() throws GadgetDataServiceException;
+    int getNonCompliantDeviceCount() throws SQLException;
 
     @SuppressWarnings("unused")
-    int getUnmonitoredDeviceCount() throws GadgetDataServiceException;
+    int getUnmonitoredDeviceCount() throws SQLException;
 
     @SuppressWarnings("unused")
     PaginationResult getNonCompliantDeviceCountsByFeatures(PaginationRequest paginationRequest)
-            throws GadgetDataServiceException;
+                                                           throws SQLException, InvalidParameterException;
 
     @SuppressWarnings("unused")
-    int getDeviceCount(Map<String, Object> filters) throws GadgetDataServiceException;
+    int getDeviceCount(Map<String, Object> filters) throws SQLException;
 
     @SuppressWarnings("unused")
     int getFeatureNonCompliantDeviceCount(String nonCompliantFeatureCode,
-                                          Map<String, Object> filters) throws GadgetDataServiceException;
+                                          Map<String, Object> filters) throws SQLException, InvalidParameterException;
 
     @SuppressWarnings("unused")
-    Map<String, Integer> getDeviceCountsByPlatforms(Map<String, Object> filters) throws GadgetDataServiceException;
+    Map<String, Integer> getDeviceCountsByPlatforms(Map<String, Object> filters) throws SQLException;
 
     @SuppressWarnings("unused")
     Map<String, Integer> getFeatureNonCompliantDeviceCountsByPlatforms(String nonCompliantFeatureCode,
-                                                         Map<String, Object> filters) throws GadgetDataServiceException;
+                                          Map<String, Object> filters) throws SQLException, InvalidParameterException;
 
     @SuppressWarnings("unused")
-    Map<String, Integer> getDeviceCountsByOwnershipTypes(Map<String, Object> filters) throws GadgetDataServiceException;
+    Map<String, Integer> getDeviceCountsByOwnershipTypes(Map<String, Object> filters) throws SQLException;
 
     @SuppressWarnings("unused")
     Map<String, Integer> getFeatureNonCompliantDeviceCountsByOwnershipTypes(String nonCompliantFeatureCode,
-                                                         Map<String, Object> filters) throws GadgetDataServiceException;
+                                          Map<String, Object> filters) throws SQLException, InvalidParameterException;
 
     @SuppressWarnings("unused")
     PaginationResult getDevicesWithDetails(Map<String, Object> filters,
-                                           PaginationRequest paginationRequest) throws GadgetDataServiceException;
+                                  PaginationRequest paginationRequest) throws SQLException, InvalidParameterException;
 
     @SuppressWarnings("unused")
     PaginationResult getFeatureNonCompliantDevicesWithDetails(String nonCompliantFeatureCode,
-                    Map<String, Object> filters, PaginationRequest paginationRequest) throws GadgetDataServiceException;
+                                    Map<String, Object> filters, PaginationRequest paginationRequest)
+                                                            throws SQLException, InvalidParameterException;
 
     @SuppressWarnings("unused")
-    List<Map<String, Object>> getDevicesWithDetails(Map<String, Object> filters) throws GadgetDataServiceException;
+    List<Map<String, Object>> getDevicesWithDetails(Map<String, Object> filters) throws SQLException;
 
     @SuppressWarnings("unused")
     List<Map<String, Object>> getFeatureNonCompliantDevicesWithDetails(String nonCompliantFeatureCode,
-                                                         Map<String, Object> filters) throws GadgetDataServiceException;
+                                          Map<String, Object> filters) throws SQLException, InvalidParameterException;
 
 }

components/device-mgt/org.wso2.carbon.device.mgt.analytics.dashboard/src/main/java/org/wso2/carbon/device/mgt/analytics/dashboard/GadgetDataServiceException.java

@@ -1,82 +0,0 @@
-/*
- * Copyright (c) 2016, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
- *
- * WSO2 Inc. licenses this file to you under the Apache License,
- * Version 2.0 (the "License"); you may not use this file except
- * in compliance with the License.
- * you may obtain a copy of the License at
- *
- *   http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied.  See the License for the
- * specific language governing permissions and limitations
- * under the License.
- */
-
-package org.wso2.carbon.device.mgt.analytics.dashboard;
-
-/**
- * Custom exception class for GadgetDataService layer.
- */
-public class GadgetDataServiceException extends Exception {
-
-    private String errorMessage;
-    private static final long serialVersionUID = 2021891706072918864L;
-
-    /**
-     * Constructs a new exception with the specific error message and nested exception.
-     *
-     * @param errorMessage specific error message.
-     * @param nestedException Nested exception.
-     */
-    public GadgetDataServiceException(String errorMessage, Exception nestedException) {
-        super(errorMessage, nestedException);
-        setErrorMessage(errorMessage);
-    }
-
-    /**
-     * Constructs a new exception with the specific error message and cause.
-     *
-     * @param errorMessage Specific error message.
-     * @param cause Cause of this exception.
-     */
-    @SuppressWarnings("unused")
-    public GadgetDataServiceException(String errorMessage, Throwable cause) {
-        super(errorMessage, cause);
-        setErrorMessage(errorMessage);
-    }
-
-    /**
-     * Constructs a new exception with the specific error message.
-     *
-     * @param errorMessage Specific error message.
-     */
-    @SuppressWarnings("unused")
-    public GadgetDataServiceException(String errorMessage) {
-        super(errorMessage);
-        setErrorMessage(errorMessage);
-    }
-
-    /**
-     * Constructs a new exception with the specific error message and cause.
-     *
-     * @param cause Cause of this exception.
-     */
-    @SuppressWarnings("unused")
-    public GadgetDataServiceException(Throwable cause) {
-        super(cause);
-    }
-
-    @SuppressWarnings("unused")
-    public String getErrorMessage() {
-        return errorMessage;
-    }
-
-    public void setErrorMessage(String errorMessage) {
-        this.errorMessage = errorMessage;
-    }
-
-}

components/device-mgt/org.wso2.carbon.device.mgt.analytics.dashboard/src/main/java/org/wso2/carbon/device/mgt/analytics/dashboard/dao/GadgetDataServiceDAO.java

@@ -18,9 +18,11 @@
 
 package org.wso2.carbon.device.mgt.analytics.dashboard.dao;
 
+import org.wso2.carbon.device.mgt.analytics.dashboard.dao.exception.InvalidParameterException;
 import org.wso2.carbon.device.mgt.common.PaginationRequest;
 import org.wso2.carbon.device.mgt.common.PaginationResult;
 
+import java.sql.SQLException;
 import java.util.List;
 import java.util.Map;
 
@@ -31,70 +33,71 @@ public interface GadgetDataServiceDAO {
      *
      * @return Total filtered device count.
      */
-    int getTotalDeviceCount() throws GadgetDataServiceDAOException;
+    int getTotalDeviceCount() throws SQLException;
 
     /**
      * Method to get active device count from a particular tenant.
      *
      * @return active device count.
      */
-    int getActiveDeviceCount() throws GadgetDataServiceDAOException;
+    int getActiveDeviceCount() throws SQLException;
 
     /**
      * Method to get inactive device count from a particular tenant.
      *
      * @return inactive device count.
      */
-    int getInactiveDeviceCount() throws GadgetDataServiceDAOException;
+    int getInactiveDeviceCount() throws SQLException;
 
     /**
      * Method to get removed device count from a particular tenant.
      *
      * @return removed device count.
      */
-    int getRemovedDeviceCount() throws GadgetDataServiceDAOException;
+    int getRemovedDeviceCount() throws SQLException;
 
     /**
      * Method to get non-compliant device count from a particular tenant.
      *
      * @return Non-compliant device count.
      */
-    int getNonCompliantDeviceCount() throws GadgetDataServiceDAOException;
+    int getNonCompliantDeviceCount() throws SQLException;
 
     /**
      * Method to get unmonitored device count from a particular tenant.
      *
      * @return Unmonitored device count.
      */
-    int getUnmonitoredDeviceCount() throws GadgetDataServiceDAOException;
+    int getUnmonitoredDeviceCount() throws SQLException;
 
-    PaginationResult getNonCompliantDeviceCountsByFeatures(PaginationRequest paginationRequest) throws GadgetDataServiceDAOException;
+    PaginationResult getNonCompliantDeviceCountsByFeatures(PaginationRequest paginationRequest)
+            throws InvalidParameterException, SQLException;
 
-    int getDeviceCount(Map<String, Object> filters) throws GadgetDataServiceDAOException;
+    int getDeviceCount(Map<String, Object> filters) throws SQLException;
 
     int getFeatureNonCompliantDeviceCount(String nonCompliantFeatureCode,
-                                          Map<String, Object> filters) throws GadgetDataServiceDAOException;
+                                          Map<String, Object> filters) throws InvalidParameterException, SQLException;
 
-    Map<String, Integer> getDeviceCountsByPlatforms(Map<String, Object> filters) throws GadgetDataServiceDAOException;
+    Map<String, Integer> getDeviceCountsByPlatforms(Map<String, Object> filters) throws SQLException;
 
     Map<String, Integer> getFeatureNonCompliantDeviceCountsByPlatforms(String nonCompliantFeatureCode,
-                                                    Map<String, Object> filters) throws GadgetDataServiceDAOException;
+                                          Map<String, Object> filters) throws InvalidParameterException, SQLException;
 
-    Map<String, Integer> getDeviceCountsByOwnershipTypes(Map<String, Object> filters)
+    Map<String, Integer> getDeviceCountsByOwnershipTypes(Map<String, Object> filters) throws SQLException;
-            throws GadgetDataServiceDAOException;
 
     Map<String, Integer> getFeatureNonCompliantDeviceCountsByOwnershipTypes(String nonCompliantFeatureCode,
-                                                    Map<String, Object> filters) throws GadgetDataServiceDAOException;
+                                          Map<String, Object> filters) throws InvalidParameterException, SQLException;
 
     PaginationResult getDevicesWithDetails(Map<String, Object> filters,
-                                           PaginationRequest paginationRequest) throws GadgetDataServiceDAOException;
+                                  PaginationRequest paginationRequest) throws InvalidParameterException, SQLException;
 
     PaginationResult getFeatureNonCompliantDevicesWithDetails(String nonCompliantFeatureCode,
-            Map<String, Object> filters, PaginationRequest paginationRequest) throws GadgetDataServiceDAOException;
+                                    Map<String, Object> filters, PaginationRequest paginationRequest)
+                                            throws InvalidParameterException, SQLException;
 
-    List<Map<String, Object>> getDevicesWithDetails(Map<String, Object> filters) throws GadgetDataServiceDAOException;
+    List<Map<String, Object>> getDevicesWithDetails(Map<String, Object> filters) throws SQLException;
 
     List<Map<String, Object>> getFeatureNonCompliantDevicesWithDetails(String nonCompliantFeatureCode,
-                                            Map<String, Object> filters) throws GadgetDataServiceDAOException;
+                                          Map<String, Object> filters) throws InvalidParameterException, SQLException;
 
 }

components/device-mgt/org.wso2.carbon.device.mgt.analytics.dashboard/src/main/java/org/wso2/carbon/device/mgt/analytics/dashboard/dao/GadgetDataServiceDAOException.java

@@ -1,82 +0,0 @@
-/*
- * Copyright (c) 2016, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
- *
- * WSO2 Inc. licenses this file to you under the Apache License,
- * Version 2.0 (the "License"); you may not use this file except
- * in compliance with the License.
- * you may obtain a copy of the License at
- *
- *   http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied.  See the License for the
- * specific language governing permissions and limitations
- * under the License.
- */
-
-package org.wso2.carbon.device.mgt.analytics.dashboard.dao;
-
-/**
- * Custom exception class for GadgetDataServiceDAO layer.
- */
-public class GadgetDataServiceDAOException extends Exception {
-
-    private String errorMessage;
-    private static final long serialVersionUID = 2021891706072918864L;
-
-    /**
-     * Constructs a new exception with the specific error message and nested exception.
-     *
-     * @param errorMessage specific error message.
-     * @param nestedException Nested exception.
-     */
-    public GadgetDataServiceDAOException(String errorMessage, Exception nestedException) {
-        super(errorMessage, nestedException);
-        setErrorMessage(errorMessage);
-    }
-
-    /**
-     * Constructs a new exception with the specific error message and cause.
-     *
-     * @param errorMessage Specific error message.
-     * @param cause Cause of this exception.
-     */
-    @SuppressWarnings("unused")
-    public GadgetDataServiceDAOException(String errorMessage, Throwable cause) {
-        super(errorMessage, cause);
-        setErrorMessage(errorMessage);
-    }
-
-    /**
-     * Constructs a new exception with the specific error message.
-     *
-     * @param errorMessage Specific error message.
-     */
-    @SuppressWarnings("unused")
-    public GadgetDataServiceDAOException(String errorMessage) {
-        super(errorMessage);
-        setErrorMessage(errorMessage);
-    }
-
-    /**
-     * Constructs a new exception with the specific error message and cause.
-     *
-     * @param cause Cause of this exception.
-     */
-    @SuppressWarnings("unused")
-    public GadgetDataServiceDAOException(Throwable cause) {
-        super(cause);
-    }
-
-    @SuppressWarnings("unused")
-    public String getErrorMessage() {
-        return errorMessage;
-    }
-
-    public void setErrorMessage(String errorMessage) {
-        this.errorMessage = errorMessage;
-    }
-
-}

components/device-mgt/org.wso2.carbon.device.mgt.analytics.dashboard/src/main/java/org/wso2/carbon/device/mgt/analytics/dashboard/dao/impl/GadgetDataServiceDAOImpl.java

@@ -20,8 +20,8 @@ package org.wso2.carbon.device.mgt.analytics.dashboard.dao.impl;
 
 import org.wso2.carbon.context.PrivilegedCarbonContext;
 import org.wso2.carbon.device.mgt.analytics.dashboard.dao.GadgetDataServiceDAO;
-import org.wso2.carbon.device.mgt.analytics.dashboard.dao.GadgetDataServiceDAOException;
 import org.wso2.carbon.device.mgt.analytics.dashboard.dao.GadgetDataServiceDAOFactory;
+import org.wso2.carbon.device.mgt.analytics.dashboard.dao.exception.InvalidParameterException;
 import org.wso2.carbon.device.mgt.common.PaginationRequest;
 import org.wso2.carbon.device.mgt.common.PaginationResult;
 import org.wso2.carbon.device.mgt.core.dao.util.DeviceManagementDAOUtil;
@@ -38,40 +38,40 @@ import java.util.Map;
 public class GadgetDataServiceDAOImpl implements GadgetDataServiceDAO {
 
     @Override
-    public int getTotalDeviceCount() throws GadgetDataServiceDAOException {
+    public int getTotalDeviceCount() throws SQLException {
         return this.getDeviceCount(null);
     }
 
     @Override
-    public int getActiveDeviceCount() throws GadgetDataServiceDAOException {
+    public int getActiveDeviceCount() throws SQLException {
         Map<String, Object> filters = new HashMap<>();
         filters.put("CONNECTIVITY_STATUS", "ACTIVE");
         return this.getDeviceCount(filters);
     }
 
     @Override
-    public int getInactiveDeviceCount() throws GadgetDataServiceDAOException {
+    public int getInactiveDeviceCount() throws SQLException {
         Map<String, Object> filters = new HashMap<>();
         filters.put("CONNECTIVITY_STATUS", "INACTIVE");
         return this.getDeviceCount(filters);
     }
 
     @Override
-    public int getRemovedDeviceCount() throws GadgetDataServiceDAOException {
+    public int getRemovedDeviceCount() throws SQLException {
         Map<String, Object> filters = new HashMap<>();
         filters.put("CONNECTIVITY_STATUS", "REMOVED");
         return this.getDeviceCount(filters);
     }
 
     @Override
-    public int getNonCompliantDeviceCount() throws GadgetDataServiceDAOException {
+    public int getNonCompliantDeviceCount() throws SQLException {
         Map<String, Object> filters = new HashMap<>();
         filters.put("IS_COMPLIANT", 0);
         return this.getDeviceCount(filters);
     }
 
     @Override
-    public int getUnmonitoredDeviceCount() throws GadgetDataServiceDAOException {
+    public int getUnmonitoredDeviceCount() throws SQLException {
         Map<String, Object> filters = new HashMap<>();
         filters.put("POLICY_ID", -1);
         return this.getDeviceCount(filters);
@@ -79,7 +79,22 @@ public class GadgetDataServiceDAOImpl implements GadgetDataServiceDAO {
 
     @Override
     public PaginationResult getNonCompliantDeviceCountsByFeatures(PaginationRequest paginationRequest)
-                                                                  throws GadgetDataServiceDAOException {
+                                                                  throws InvalidParameterException, SQLException {
+
+        if (paginationRequest == null) {
+            throw new InvalidParameterException("PaginationRequest object should not be null.");
+        }
+
+        if (paginationRequest.getStartIndex() < 0) {
+            throw new InvalidParameterException("startIndex of PaginationRequest object " +
+                "should be equal to 0 or greater than that.");
+        }
+
+        if (paginationRequest.getRowCount() < 5) {
+            throw new InvalidParameterException("rowCount of PaginationRequest object " +
+                "should be equal to 5 or greater than that.");
+        }
+
         Connection con;
         PreparedStatement stmt = null;
         ResultSet rs = null;
@@ -118,9 +133,6 @@ public class GadgetDataServiceDAOImpl implements GadgetDataServiceDAO {
             while (rs.next()) {
                 totalRecordsCount = rs.getInt("NON_COMPLIANT_FEATURE_COUNT");
             }
-        } catch (SQLException e) {
-            throw new GadgetDataServiceDAOException("Error occurred @ GadgetDataServiceDAO layer while trying to " +
-                "execute relevant SQL queries for getting non compliant device counts by features.", e);
         } finally {
             DeviceManagementDAOUtil.cleanupResources(stmt, rs);
         }
@@ -130,7 +142,7 @@ public class GadgetDataServiceDAOImpl implements GadgetDataServiceDAO {
         return paginationResult;
     }
 
-    public int getDeviceCount(Map<String, Object> filters) throws GadgetDataServiceDAOException {
+    public int getDeviceCount(Map<String, Object> filters) throws SQLException {
         Connection con;
         PreparedStatement stmt = null;
         ResultSet rs = null;
@@ -166,16 +178,19 @@ public class GadgetDataServiceDAOImpl implements GadgetDataServiceDAO {
             while (rs.next()) {
                 filteredDeviceCount = rs.getInt("DEVICE_COUNT");
             }
-        } catch (SQLException e) {
-            throw new GadgetDataServiceDAOException("Error occurred @ GadgetDataServiceDAO layer while trying to " +
-                "execute relevant SQL queries for getting a filtered device count.", e);
         } finally {
             DeviceManagementDAOUtil.cleanupResources(stmt, rs);
         }
         return filteredDeviceCount;
     }
 
-    public int getFeatureNonCompliantDeviceCount(String nonCompliantFeatureCode, Map<String, Object> filters) throws GadgetDataServiceDAOException {
+    public int getFeatureNonCompliantDeviceCount(String nonCompliantFeatureCode, Map<String, Object> filters)
+                                                 throws InvalidParameterException, SQLException {
+
+        if (nonCompliantFeatureCode == null || "".equals(nonCompliantFeatureCode)) {
+            throw new InvalidParameterException("nonCompliantFeatureCode should not be either null or empty.");
+        }
+
         Connection con;
         PreparedStatement stmt = null;
         ResultSet rs = null;
@@ -212,17 +227,13 @@ public class GadgetDataServiceDAOImpl implements GadgetDataServiceDAO {
             while (rs.next()) {
                 filteredDeviceCount = rs.getInt("DEVICE_COUNT");
             }
-        } catch (SQLException e) {
-            throw new GadgetDataServiceDAOException("Error occurred @ GadgetDataServiceDAO layer while trying to " +
-                "execute relevant SQL queries for getting a filtered device count, " +
-                    "non compliant by a particular feature.", e);
         } finally {
             DeviceManagementDAOUtil.cleanupResources(stmt, rs);
         }
         return filteredDeviceCount;
     }
 
-    public Map<String, Integer> getDeviceCountsByPlatforms(Map<String, Object> filters) throws GadgetDataServiceDAOException {
+    public Map<String, Integer> getDeviceCountsByPlatforms(Map<String, Object> filters) throws SQLException {
         Connection con;
         PreparedStatement stmt = null;
         ResultSet rs = null;
@@ -260,16 +271,19 @@ public class GadgetDataServiceDAOImpl implements GadgetDataServiceDAO {
             while (rs.next()) {
                 filteredDeviceCountsByPlatforms.put(rs.getString("PLATFORM"), rs.getInt("DEVICE_COUNT"));
             }
-        } catch (SQLException e) {
-            throw new GadgetDataServiceDAOException("Error occurred @ GadgetDataServiceDAO layer while trying to " +
-                "execute relevant SQL queries for getting a filtered set of device counts by platforms.", e);
         } finally {
             DeviceManagementDAOUtil.cleanupResources(stmt, rs);
         }
         return filteredDeviceCountsByPlatforms;
     }
 
-    public Map<String, Integer> getFeatureNonCompliantDeviceCountsByPlatforms(String nonCompliantFeatureCode, Map<String, Object> filters) throws GadgetDataServiceDAOException {
+    public Map<String, Integer> getFeatureNonCompliantDeviceCountsByPlatforms(String nonCompliantFeatureCode,
+                                        Map<String, Object> filters) throws InvalidParameterException, SQLException {
+
+        if (nonCompliantFeatureCode == null || "".equals(nonCompliantFeatureCode)) {
+            throw new InvalidParameterException("nonCompliantFeatureCode should not be either null or empty.");
+        }
+
         Connection con;
         PreparedStatement stmt = null;
         ResultSet rs = null;
@@ -308,16 +322,13 @@ public class GadgetDataServiceDAOImpl implements GadgetDataServiceDAO {
             while (rs.next()) {
                 filteredDeviceCountsByPlatforms.put(rs.getString("PLATFORM"), rs.getInt("DEVICE_COUNT"));
             }
-        } catch (SQLException e) {
-            throw new GadgetDataServiceDAOException("Error occurred @ GadgetDataServiceDAO layer while trying to " +
-                "execute relevant SQL queries for getting a set of feature non-compliant device counts by platforms.", e);
         } finally {
             DeviceManagementDAOUtil.cleanupResources(stmt, rs);
         }
         return filteredDeviceCountsByPlatforms;
     }
 
-    public Map<String, Integer> getDeviceCountsByOwnershipTypes(Map<String, Object> filters) throws GadgetDataServiceDAOException {
+    public Map<String, Integer> getDeviceCountsByOwnershipTypes(Map<String, Object> filters) throws SQLException {
         Connection con;
         PreparedStatement stmt = null;
         ResultSet rs = null;
@@ -355,9 +366,6 @@ public class GadgetDataServiceDAOImpl implements GadgetDataServiceDAO {
             while (rs.next()) {
                 filteredDeviceCountsByOwnershipTypes.put(rs.getString("OWNERSHIP"), rs.getInt("DEVICE_COUNT"));
             }
-        } catch (SQLException e) {
-            throw new GadgetDataServiceDAOException("Error occurred @ GadgetDataServiceDAO layer while trying to " +
-                "execute relevant SQL queries for getting a filtered set of device counts by ownership types.", e);
         } finally {
             DeviceManagementDAOUtil.cleanupResources(stmt, rs);
         }
@@ -365,7 +373,12 @@ public class GadgetDataServiceDAOImpl implements GadgetDataServiceDAO {
     }
 
     public Map<String, Integer> getFeatureNonCompliantDeviceCountsByOwnershipTypes(String nonCompliantFeatureCode,
-                                Map<String, Object> filters) throws GadgetDataServiceDAOException {
+                                          Map<String, Object> filters) throws InvalidParameterException, SQLException {
+
+        if (nonCompliantFeatureCode == null || "".equals(nonCompliantFeatureCode)) {
+            throw new InvalidParameterException("nonCompliantFeatureCode should not be either null or empty.");
+        }
+
         Connection con;
         PreparedStatement stmt = null;
         ResultSet rs = null;
@@ -404,10 +417,6 @@ public class GadgetDataServiceDAOImpl implements GadgetDataServiceDAO {
             while (rs.next()) {
                 filteredDeviceCountsByOwnershipTypes.put(rs.getString("OWNERSHIP"), rs.getInt("DEVICE_COUNT"));
             }
-        } catch (SQLException e) {
-            throw new GadgetDataServiceDAOException("Error occurred @ GadgetDataServiceDAO layer while trying to " +
-                "execute relevant SQL queries for getting a filtered set of feature " +
-                    "non-compliant device counts by ownership types.", e);
         } finally {
             DeviceManagementDAOUtil.cleanupResources(stmt, rs);
         }
@@ -415,7 +424,22 @@ public class GadgetDataServiceDAOImpl implements GadgetDataServiceDAO {
     }
 
     public PaginationResult getDevicesWithDetails(Map<String, Object> filters,
-                                        PaginationRequest paginationRequest) throws GadgetDataServiceDAOException {
+                                  PaginationRequest paginationRequest) throws InvalidParameterException, SQLException {
+
+        if (paginationRequest == null) {
+            throw new InvalidParameterException("PaginationRequest object should not be null.");
+        }
+
+        if (paginationRequest.getStartIndex() < 0) {
+            throw new InvalidParameterException("startIndex of PaginationRequest object " +
+                "should be equal to 0 or greater than that.");
+        }
+
+        if (paginationRequest.getRowCount() < 5) {
+            throw new InvalidParameterException("rowCount of PaginationRequest object " +
+                "should be equal to 5 or greater than that.");
+        }
+
         Connection con;
         PreparedStatement stmt = null;
         ResultSet rs = null;
@@ -477,10 +501,6 @@ public class GadgetDataServiceDAOImpl implements GadgetDataServiceDAO {
             while (rs.next()) {
                 totalRecordsCount = rs.getInt("DEVICE_COUNT");
             }
-        } catch (SQLException e) {
-            throw new GadgetDataServiceDAOException("Error occurred @ GadgetDataServiceDAO layer while trying to " +
-                "execute relevant SQL queries for getting a filtered set of devices " +
-                    "with details when pagination is enabled.", e);
         } finally {
             DeviceManagementDAOUtil.cleanupResources(stmt, rs);
         }
@@ -491,7 +511,27 @@ public class GadgetDataServiceDAOImpl implements GadgetDataServiceDAO {
     }
 
     public PaginationResult getFeatureNonCompliantDevicesWithDetails(String nonCompliantFeatureCode,
-        Map<String, Object> filters, PaginationRequest paginationRequest) throws GadgetDataServiceDAOException {
+                                            Map<String, Object> filters, PaginationRequest paginationRequest)
+                                                                      throws InvalidParameterException, SQLException {
+
+        if (nonCompliantFeatureCode == null || "".equals(nonCompliantFeatureCode)) {
+            throw new InvalidParameterException("nonCompliantFeatureCode should not be either null or empty.");
+        }
+
+        if (paginationRequest == null) {
+            throw new InvalidParameterException("PaginationRequest object should not be null.");
+        }
+
+        if (paginationRequest.getStartIndex() < 0) {
+            throw new InvalidParameterException("startIndex of PaginationRequest object " +
+                    "should be equal to 0 or greater than that.");
+        }
+
+        if (paginationRequest.getRowCount() < 5) {
+            throw new InvalidParameterException("rowCount of PaginationRequest object " +
+                    "should be equal to 5 or greater than that.");
+        }
+
         Connection con;
         PreparedStatement stmt = null;
         ResultSet rs = null;
@@ -556,10 +596,6 @@ public class GadgetDataServiceDAOImpl implements GadgetDataServiceDAO {
             while (rs.next()) {
                 totalRecordsCount = rs.getInt("DEVICE_COUNT");
             }
-        } catch (SQLException e) {
-            throw new GadgetDataServiceDAOException("Error occurred @ GadgetDataServiceDAO layer while trying to " +
-                "execute relevant SQL queries for getting a filtered set of feature non-compliant devices " +
-                    "with details when pagination is enabled.", e);
         } finally {
             DeviceManagementDAOUtil.cleanupResources(stmt, rs);
         }
@@ -569,7 +605,7 @@ public class GadgetDataServiceDAOImpl implements GadgetDataServiceDAO {
         return paginationResult;
     }
 
-    public List<Map<String, Object>> getDevicesWithDetails(Map<String, Object> filters) throws GadgetDataServiceDAOException {
+    public List<Map<String, Object>> getDevicesWithDetails(Map<String, Object> filters) throws SQLException {
         Connection con;
         PreparedStatement stmt = null;
         ResultSet rs = null;
@@ -612,9 +648,6 @@ public class GadgetDataServiceDAOImpl implements GadgetDataServiceDAO {
                 filteredDeviceWithDetails.put("connectivity-details", rs.getString("CONNECTIVITY_STATUS"));
                 filteredDevicesWithDetails.add(filteredDeviceWithDetails);
             }
-        } catch (SQLException e) {
-            throw new GadgetDataServiceDAOException("Error occurred @ GadgetDataServiceDAO layer while trying to " +
-                "execute relevant SQL queries for getting a filtered set of devices with details.", e);
         } finally {
             DeviceManagementDAOUtil.cleanupResources(stmt, rs);
         }
@@ -622,7 +655,12 @@ public class GadgetDataServiceDAOImpl implements GadgetDataServiceDAO {
     }
 
     public List<Map<String, Object>> getFeatureNonCompliantDevicesWithDetails(String nonCompliantFeatureCode,
-                                                    Map<String, Object> filters) throws GadgetDataServiceDAOException {
+                                        Map<String, Object> filters) throws InvalidParameterException, SQLException {
+
+        if (nonCompliantFeatureCode == null || "".equals(nonCompliantFeatureCode)) {
+            throw new InvalidParameterException("nonCompliantFeatureCode should not be either null or empty.");
+        }
+
         Connection con;
         PreparedStatement stmt = null;
         ResultSet rs = null;
@@ -667,9 +705,6 @@ public class GadgetDataServiceDAOImpl implements GadgetDataServiceDAO {
                 filteredDeviceWithDetails.put("connectivity-details", rs.getString("CONNECTIVITY_STATUS"));
                 filteredDevicesWithDetails.add(filteredDeviceWithDetails);
             }
-        } catch (SQLException e) {
-            throw new GadgetDataServiceDAOException("Error occurred @ GadgetDataServiceDAO layer while trying to " +
-                "execute relevant SQL queries for getting filtered set of feature non-compliant devices with details.", e);
         } finally {
             DeviceManagementDAOUtil.cleanupResources(stmt, rs);
         }

components/device-mgt/org.wso2.carbon.device.mgt.analytics.dashboard/src/main/java/org/wso2/carbon/device/mgt/analytics/dashboard/impl/GadgetDataServiceImpl.java

@@ -19,9 +19,8 @@
 package org.wso2.carbon.device.mgt.analytics.dashboard.impl;
 
 import org.wso2.carbon.device.mgt.analytics.dashboard.GadgetDataService;
-import org.wso2.carbon.device.mgt.analytics.dashboard.GadgetDataServiceException;
-import org.wso2.carbon.device.mgt.analytics.dashboard.dao.GadgetDataServiceDAOException;
 import org.wso2.carbon.device.mgt.analytics.dashboard.dao.GadgetDataServiceDAOFactory;
+import org.wso2.carbon.device.mgt.analytics.dashboard.dao.exception.InvalidParameterException;
 import org.wso2.carbon.device.mgt.common.PaginationRequest;
 import org.wso2.carbon.device.mgt.common.PaginationResult;
 
@@ -35,17 +34,11 @@ import java.util.Map;
 public class GadgetDataServiceImpl implements GadgetDataService {
 
     @Override
-    public int getTotalDeviceCount() throws GadgetDataServiceException {
+    public int getTotalDeviceCount() throws SQLException {
         int totalDeviceCount;
         try {
             GadgetDataServiceDAOFactory.openConnection();
             totalDeviceCount = GadgetDataServiceDAOFactory.getGadgetDataServiceDAO().getTotalDeviceCount();
-        } catch (SQLException e) {
-            throw new GadgetDataServiceException("Error occurred @ GadgetDataService layer " +
-                "in opening database connection.", e);
-        } catch (GadgetDataServiceDAOException e) {
-            throw new GadgetDataServiceException("Error occurred @ GadgetDataService layer " +
-                "in calling DAO function for total device count.", e);
         } finally {
             GadgetDataServiceDAOFactory.closeConnection();
         }
@@ -53,17 +46,11 @@ public class GadgetDataServiceImpl implements GadgetDataService {
     }
 
     @Override
-    public int getActiveDeviceCount() throws GadgetDataServiceException {
+    public int getActiveDeviceCount() throws SQLException {
         int activeDeviceCount;
         try {
             GadgetDataServiceDAOFactory.openConnection();
             activeDeviceCount = GadgetDataServiceDAOFactory.getGadgetDataServiceDAO().getActiveDeviceCount();
-        } catch (SQLException e) {
-            throw new GadgetDataServiceException("Error occurred @ GadgetDataService layer " +
-                "in opening database connection.", e);
-        } catch (GadgetDataServiceDAOException e) {
-            throw new GadgetDataServiceException("Error occurred @ GadgetDataService layer " +
-                "in calling DAO function for active device count.", e);
         } finally {
             GadgetDataServiceDAOFactory.closeConnection();
         }
@@ -71,17 +58,11 @@ public class GadgetDataServiceImpl implements GadgetDataService {
     }
 
     @Override
-    public int getInactiveDeviceCount() throws GadgetDataServiceException {
+    public int getInactiveDeviceCount() throws SQLException {
         int inactiveDeviceCount;
         try {
             GadgetDataServiceDAOFactory.openConnection();
             inactiveDeviceCount = GadgetDataServiceDAOFactory.getGadgetDataServiceDAO().getInactiveDeviceCount();
-        } catch (SQLException e) {
-            throw new GadgetDataServiceException("Error occurred @ GadgetDataService layer " +
-                "in opening database connection.", e);
-        } catch (GadgetDataServiceDAOException e) {
-            throw new GadgetDataServiceException("Error occurred @ GadgetDataService layer " +
-                "in calling DAO function for inactive device count.", e);
         } finally {
             GadgetDataServiceDAOFactory.closeConnection();
         }
@@ -89,17 +70,11 @@ public class GadgetDataServiceImpl implements GadgetDataService {
     }
 
     @Override
-    public int getRemovedDeviceCount() throws GadgetDataServiceException {
+    public int getRemovedDeviceCount() throws SQLException {
         int removedDeviceCount;
         try {
             GadgetDataServiceDAOFactory.openConnection();
             removedDeviceCount = GadgetDataServiceDAOFactory.getGadgetDataServiceDAO().getRemovedDeviceCount();
-        } catch (SQLException e) {
-            throw new GadgetDataServiceException("Error occurred @ GadgetDataService layer " +
-                "in opening database connection.", e);
-        } catch (GadgetDataServiceDAOException e) {
-            throw new GadgetDataServiceException("Error occurred @ GadgetDataService layer " +
-                "in calling DAO function for removed device count.", e);
         } finally {
             GadgetDataServiceDAOFactory.closeConnection();
         }
@@ -107,17 +82,12 @@ public class GadgetDataServiceImpl implements GadgetDataService {
     }
 
     @Override
-    public int getNonCompliantDeviceCount() throws GadgetDataServiceException {
+    public int getNonCompliantDeviceCount() throws SQLException {
         int nonCompliantDeviceCount;
         try {
             GadgetDataServiceDAOFactory.openConnection();
-            nonCompliantDeviceCount = GadgetDataServiceDAOFactory.getGadgetDataServiceDAO().getNonCompliantDeviceCount();
+            nonCompliantDeviceCount = GadgetDataServiceDAOFactory.
-        } catch (SQLException e) {
+                getGadgetDataServiceDAO().getNonCompliantDeviceCount();
-            throw new GadgetDataServiceException("Error occurred @ GadgetDataService layer " +
-                "in opening database connection.", e);
-        } catch (GadgetDataServiceDAOException e) {
-            throw new GadgetDataServiceException("Error occurred @ GadgetDataService layer " +
-                "in calling DAO function for non-compliant device count.", e);
         } finally {
             GadgetDataServiceDAOFactory.closeConnection();
         }
@@ -125,17 +95,11 @@ public class GadgetDataServiceImpl implements GadgetDataService {
     }
 
     @Override
-    public int getUnmonitoredDeviceCount() throws GadgetDataServiceException {
+    public int getUnmonitoredDeviceCount() throws SQLException {
         int unmonitoredDeviceCount;
         try {
             GadgetDataServiceDAOFactory.openConnection();
             unmonitoredDeviceCount = GadgetDataServiceDAOFactory.getGadgetDataServiceDAO().getUnmonitoredDeviceCount();
-        } catch (SQLException e) {
-            throw new GadgetDataServiceException("Error occurred @ GadgetDataService layer " +
-                "in opening database connection.", e);
-        } catch (GadgetDataServiceDAOException e) {
-            throw new GadgetDataServiceException("Error occurred @ GadgetDataService layer " +
-                "in calling DAO function for unmonitored device count.", e);
         } finally {
             GadgetDataServiceDAOFactory.closeConnection();
         }
@@ -144,18 +108,12 @@ public class GadgetDataServiceImpl implements GadgetDataService {
 
     @Override
     public PaginationResult getNonCompliantDeviceCountsByFeatures(PaginationRequest paginationRequest)
-                                                                  throws GadgetDataServiceException {
+                                                            throws SQLException, InvalidParameterException {
         PaginationResult paginationResult;
         try {
             GadgetDataServiceDAOFactory.openConnection();
             paginationResult = GadgetDataServiceDAOFactory.getGadgetDataServiceDAO().
                 getNonCompliantDeviceCountsByFeatures(paginationRequest);
-        } catch (SQLException e) {
-            throw new GadgetDataServiceException("Error occurred @ GadgetDataService layer " +
-                "in opening database connection.", e);
-        } catch (GadgetDataServiceDAOException e) {
-            throw new GadgetDataServiceException("Error occurred @ GadgetDataService layer in calling DAO function " +
-                "for non-compliant device counts by features.", e);
         } finally {
             GadgetDataServiceDAOFactory.closeConnection();
         }
@@ -163,17 +121,11 @@ public class GadgetDataServiceImpl implements GadgetDataService {
     }
 
     @Override
-    public int getDeviceCount(Map<String, Object> filters) throws GadgetDataServiceException {
+    public int getDeviceCount(Map<String, Object> filters) throws SQLException {
         int deviceCount;
         try {
             GadgetDataServiceDAOFactory.openConnection();
             deviceCount = GadgetDataServiceDAOFactory.getGadgetDataServiceDAO().getDeviceCount(filters);
-        } catch (SQLException e) {
-            throw new GadgetDataServiceException("Error occurred @ GadgetDataService layer " +
-                "in opening database connection.", e);
-        } catch (GadgetDataServiceDAOException e) {
-            throw new GadgetDataServiceException("Error occurred @ GadgetDataService layer " +
-                "in calling DAO function for getting a filtered device count.", e);
         } finally {
             GadgetDataServiceDAOFactory.closeConnection();
         }
@@ -182,18 +134,12 @@ public class GadgetDataServiceImpl implements GadgetDataService {
 
     @Override
     public int getFeatureNonCompliantDeviceCount(String nonCompliantFeatureCode, Map<String, Object> filters)
-                                                 throws GadgetDataServiceException {
+                                                                    throws SQLException, InvalidParameterException {
         int featureNonCompliantDeviceCount;
         try {
             GadgetDataServiceDAOFactory.openConnection();
             featureNonCompliantDeviceCount = GadgetDataServiceDAOFactory.
                 getGadgetDataServiceDAO().getFeatureNonCompliantDeviceCount(nonCompliantFeatureCode, filters);
-        } catch (SQLException e) {
-            throw new GadgetDataServiceException("Error occurred @ GadgetDataService layer " +
-                "in opening database connection.", e);
-        } catch (GadgetDataServiceDAOException e) {
-            throw new GadgetDataServiceException("Error occurred @ GadgetDataService layer in calling DAO function " +
-                "for getting a filtered device count, non compliant by a particular feature.", e);
         } finally {
             GadgetDataServiceDAOFactory.closeConnection();
         }
@@ -201,19 +147,12 @@ public class GadgetDataServiceImpl implements GadgetDataService {
     }
 
     @Override
-    public Map<String, Integer> getDeviceCountsByPlatforms(Map<String, Object> filters)
+    public Map<String, Integer> getDeviceCountsByPlatforms(Map<String, Object> filters) throws SQLException {
-                                                           throws GadgetDataServiceException {
         Map<String, Integer> deviceCountsByPlatforms;
         try {
             GadgetDataServiceDAOFactory.openConnection();
             deviceCountsByPlatforms = GadgetDataServiceDAOFactory.getGadgetDataServiceDAO().
                 getDeviceCountsByPlatforms(filters);
-        } catch (SQLException e) {
-            throw new GadgetDataServiceException("Error occurred @ GadgetDataService layer " +
-                "in opening database connection.", e);
-        } catch (GadgetDataServiceDAOException e) {
-            throw new GadgetDataServiceException("Error occurred @ GadgetDataService layer in calling DAO function " +
-                "for getting filtered device counts by platforms.", e);
         } finally {
             GadgetDataServiceDAOFactory.closeConnection();
         }
@@ -222,18 +161,12 @@ public class GadgetDataServiceImpl implements GadgetDataService {
 
     @Override
     public Map<String, Integer> getFeatureNonCompliantDeviceCountsByPlatforms(String nonCompliantFeatureCode,
-                                                       Map<String, Object> filters) throws GadgetDataServiceException {
+                                         Map<String, Object> filters) throws SQLException, InvalidParameterException {
         Map<String, Integer> featureNonCompliantDeviceCountsByPlatforms;
         try {
             GadgetDataServiceDAOFactory.openConnection();
-            featureNonCompliantDeviceCountsByPlatforms = GadgetDataServiceDAOFactory.
+            featureNonCompliantDeviceCountsByPlatforms = GadgetDataServiceDAOFactory.getGadgetDataServiceDAO().
-                getGadgetDataServiceDAO().getFeatureNonCompliantDeviceCountsByPlatforms(nonCompliantFeatureCode, filters);
+                getFeatureNonCompliantDeviceCountsByPlatforms(nonCompliantFeatureCode, filters);
-        } catch (SQLException e) {
-            throw new GadgetDataServiceException("Error occurred @ GadgetDataService layer " +
-                "in opening database connection.", e);
-        } catch (GadgetDataServiceDAOException e) {
-            throw new GadgetDataServiceException("Error occurred @ GadgetDataService layer in calling DAO function " +
-                "for getting filtered device counts by platforms, non compliant by a particular feature.", e);
         } finally {
             GadgetDataServiceDAOFactory.closeConnection();
         }
@@ -241,19 +174,12 @@ public class GadgetDataServiceImpl implements GadgetDataService {
     }
 
     @Override
-    public Map<String, Integer> getDeviceCountsByOwnershipTypes(Map<String, Object> filters)
+    public Map<String, Integer> getDeviceCountsByOwnershipTypes(Map<String, Object> filters) throws SQLException {
-                                                                throws GadgetDataServiceException {
         Map<String, Integer> deviceCountsByOwnershipTypes;
         try {
             GadgetDataServiceDAOFactory.openConnection();
             deviceCountsByOwnershipTypes = GadgetDataServiceDAOFactory.getGadgetDataServiceDAO().
                 getDeviceCountsByOwnershipTypes(filters);
-        } catch (SQLException e) {
-            throw new GadgetDataServiceException("Error occurred @ GadgetDataService layer " +
-                "in opening database connection.", e);
-        } catch (GadgetDataServiceDAOException e) {
-            throw new GadgetDataServiceException("Error occurred @ GadgetDataService layer in calling DAO function " +
-                "for getting filtered device counts by ownership types.", e);
         } finally {
             GadgetDataServiceDAOFactory.closeConnection();
         }
@@ -262,19 +188,12 @@ public class GadgetDataServiceImpl implements GadgetDataService {
 
     @Override
     public Map<String, Integer> getFeatureNonCompliantDeviceCountsByOwnershipTypes(String nonCompliantFeatureCode,
-                                                        Map<String, Object> filters) throws GadgetDataServiceException {
+                                         Map<String, Object> filters) throws SQLException, InvalidParameterException {
         Map<String, Integer> featureNonCompliantDeviceCountsByOwnershipTypes;
         try {
             GadgetDataServiceDAOFactory.openConnection();
-            featureNonCompliantDeviceCountsByOwnershipTypes =
+            featureNonCompliantDeviceCountsByOwnershipTypes = GadgetDataServiceDAOFactory.getGadgetDataServiceDAO().
-                GadgetDataServiceDAOFactory.getGadgetDataServiceDAO().
+                getFeatureNonCompliantDeviceCountsByOwnershipTypes(nonCompliantFeatureCode, filters);
-                    getFeatureNonCompliantDeviceCountsByOwnershipTypes(nonCompliantFeatureCode, filters);
-        } catch (SQLException e) {
-            throw new GadgetDataServiceException("Error occurred @ GadgetDataService layer " +
-                "in opening database connection.", e);
-        } catch (GadgetDataServiceDAOException e) {
-            throw new GadgetDataServiceException("Error occurred @ GadgetDataService layer in calling DAO function " +
-                "for getting filtered device counts by ownership types, non compliant by a particular feature.", e);
         } finally {
             GadgetDataServiceDAOFactory.closeConnection();
         }
@@ -283,18 +202,12 @@ public class GadgetDataServiceImpl implements GadgetDataService {
 
     @Override
     public PaginationResult getDevicesWithDetails(Map<String, Object> filters,
-                        PaginationRequest paginationRequest) throws GadgetDataServiceException {
+                        PaginationRequest paginationRequest) throws InvalidParameterException, SQLException {
         PaginationResult paginationResult;
         try {
             GadgetDataServiceDAOFactory.openConnection();
             paginationResult = GadgetDataServiceDAOFactory.getGadgetDataServiceDAO().
-                    getDevicesWithDetails(filters, paginationRequest);
+                getDevicesWithDetails(filters, paginationRequest);
-        } catch (SQLException e) {
-            throw new GadgetDataServiceException("Error occurred @ GadgetDataService layer " +
-                "in opening database connection", e);
-        } catch (GadgetDataServiceDAOException e) {
-            throw new GadgetDataServiceException("Error occurred @ GadgetDataService layer in calling DAO function " +
-                "for getting filtered devices with details when pagination is enabled.", e);
         } finally {
             GadgetDataServiceDAOFactory.closeConnection();
         }
@@ -303,18 +216,13 @@ public class GadgetDataServiceImpl implements GadgetDataService {
 
     @Override
     public PaginationResult getFeatureNonCompliantDevicesWithDetails(String nonCompliantFeatureCode,
-                   Map<String, Object> filters, PaginationRequest paginationRequest) throws GadgetDataServiceException {
+                                            Map<String, Object> filters, PaginationRequest paginationRequest)
+                                                                    throws InvalidParameterException, SQLException {
         PaginationResult paginationResult;
         try {
             GadgetDataServiceDAOFactory.openConnection();
             paginationResult = GadgetDataServiceDAOFactory.getGadgetDataServiceDAO().
                     getFeatureNonCompliantDevicesWithDetails(nonCompliantFeatureCode, filters, paginationRequest);
-        } catch (SQLException e) {
-            throw new GadgetDataServiceException("Error occurred @ GadgetDataService layer " +
-                "in opening database connection", e);
-        } catch (GadgetDataServiceDAOException e) {
-            throw new GadgetDataServiceException("Error occurred @ GadgetDataService layer in calling DAO function " +
-                "for getting filtered devices with details, non compliant by feature when pagination is enabled.", e);
         } finally {
             GadgetDataServiceDAOFactory.closeConnection();
         }
@@ -322,18 +230,11 @@ public class GadgetDataServiceImpl implements GadgetDataService {
     }
 
     @Override
-    public List<Map<String, Object>> getDevicesWithDetails(Map<String, Object> filters)
+    public List<Map<String, Object>> getDevicesWithDetails(Map<String, Object> filters) throws SQLException {
-                                                           throws GadgetDataServiceException {
         List<Map<String, Object>> devicesWithDetails;
         try {
             GadgetDataServiceDAOFactory.openConnection();
             devicesWithDetails = GadgetDataServiceDAOFactory.getGadgetDataServiceDAO().getDevicesWithDetails(filters);
-        } catch (SQLException e) {
-            throw new GadgetDataServiceException("Error occurred @ GadgetDataService layer " +
-                "in opening database connection", e);
-        } catch (GadgetDataServiceDAOException e) {
-            throw new GadgetDataServiceException("Error occurred @ GadgetDataService layer in calling DAO function " +
-                "for getting filtered devices with details.", e);
         } finally {
             GadgetDataServiceDAOFactory.closeConnection();
         }
@@ -342,18 +243,12 @@ public class GadgetDataServiceImpl implements GadgetDataService {
 
     @Override
     public List<Map<String, Object>> getFeatureNonCompliantDevicesWithDetails(String nonCompliantFeatureCode,
-                                                       Map<String, Object> filters) throws GadgetDataServiceException {
+                                         Map<String, Object> filters) throws SQLException, InvalidParameterException {
         List<Map<String, Object>> featureNonCompliantDevicesWithDetails;
         try {
             GadgetDataServiceDAOFactory.openConnection();
             featureNonCompliantDevicesWithDetails = GadgetDataServiceDAOFactory.getGadgetDataServiceDAO().
                 getFeatureNonCompliantDevicesWithDetails(nonCompliantFeatureCode, filters);
-        } catch (SQLException e) {
-            throw new GadgetDataServiceException("Error occurred @ GadgetDataService layer " +
-                "in opening database connection", e);
-        } catch (GadgetDataServiceDAOException e) {
-            throw new GadgetDataServiceException("Error occurred @ GadgetDataService layer in calling DAO function " +
-                "for getting filtered devices with details, non compliant by feature.", e);
         } finally {
             GadgetDataServiceDAOFactory.closeConnection();
         }