Improving error handling in checking for monitoring frquency

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

@@ -26,6 +26,7 @@ import org.wso2.carbon.device.mgt.common.configuration.mgt.PlatformConfiguration
 import org.wso2.carbon.device.mgt.jaxrs.service.api.ConfigurationManagementService;
 import org.wso2.carbon.device.mgt.jaxrs.util.DeviceMgtAPIUtils;
 import org.wso2.carbon.device.mgt.jaxrs.util.MDMAppConstants;
+import org.wso2.carbon.policy.mgt.common.PolicyManagementException;
 import org.wso2.carbon.policy.mgt.core.util.PolicyManagerUtil;
 
 import javax.ws.rs.GET;
@@ -59,7 +60,7 @@ public class ConfigurationServiceImpl implements ConfigurationManagementService
             configList.add(configurationEntry);
             config.setConfiguration(configList);
             return Response.status(Response.Status.OK).entity(config).build();
-        } catch (ConfigurationManagementException e) {
+        } catch (ConfigurationManagementException | PolicyManagementException e) {
             msg = "ErrorResponse occurred while retrieving the configurations.";
             log.error(msg, e);
             return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(msg).build();

components/policy-mgt/org.wso2.carbon.policy.mgt.core/src/main/java/org/wso2/carbon/policy/mgt/core/util/PolicyManagerUtil.java

@@ -196,7 +196,7 @@ public class PolicyManagerUtil {
     }
 
 
-    public static int getMonitoringFequency() {
+    public static int getMonitoringFequency() throws PolicyManagementException {
 
         PlatformConfigurationManagementService configMgtService = new TenantConfigurationManagementServiceImpl();
         PlatformConfiguration tenantConfiguration;
@@ -209,7 +209,8 @@ public class PolicyManagerUtil {
                 for (ConfigurationEntry cEntry : configuration) {
                     if (cEntry.getName().equalsIgnoreCase(MONITORING_FREQUENCY)) {
                         if (cEntry.getValue() == null) {
-                            throw new PolicyManagementException("Invalid ")
+                            throw new PolicyManagementException("Invalid value, i.e. '" + cEntry.getValue() +
+                                    "', is configured as the monitoring frequency");
                         }
                         monitoringFrequency = Integer.parseInt(cEntry.getValue().toString());
                     }