Code cleanup

components/device-mgt/org.wso2.carbon.device.mgt.common/src/main/java/org/wso2/carbon/device/mgt/common/license/mgt/License.java

@@ -35,11 +35,6 @@ public class License {
     private Date validTo;
     private String text;
 
-    public License() {
-        this.validTo = new Date();
-        this.validFrom = new Date();
-    }
-
     @XmlElement(name = "Provider", required = true)
     public String getProvider() {
         return provider;

components/device-mgt/org.wso2.carbon.device.mgt.extensions/src/main/java/org/wso2/carbon/device/mgt/extensions/license/mgt/registry/RegistryBasedLicenseManager.java

@@ -36,6 +36,7 @@ import java.lang.String;
 import java.text.DateFormat;
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
+import java.util.Date;
 import java.util.Locale;
 
 @SuppressWarnings("unused")
@@ -79,10 +80,10 @@ public class RegistryBasedLicenseManager implements LicenseManager {
             return this.populateLicense(artifacts[0]);
         } catch (GovernanceException e) {
             throw new LicenseManagementException("Error occurred while retrieving license corresponding to " +
-                    "device type '" + deviceType + "'");
+                    "device type '" + deviceType + "'", e);
         } catch (ParseException e) {
             throw new LicenseManagementException("Error occurred while parsing the ToDate/FromDate date string " +
-                    "of the license configured upon the device type '" + deviceType + "'");
+                    "of the license configured upon the device type '" + deviceType + "'", e);
         }
     }
 
@@ -115,10 +116,14 @@ public class RegistryBasedLicenseManager implements LicenseManager {
             artifact.setAttribute(DeviceManagementConstants.LicenseProperties.PROVIDER, license.getProvider());
             artifact.setAttribute(DeviceManagementConstants.LicenseProperties.LANGUAGE, license.getLanguage());
             artifact.setAttribute(DeviceManagementConstants.LicenseProperties.TEXT, license.getText());
-            artifact.setAttribute(DeviceManagementConstants.LicenseProperties.VALID_TO,
-                    license.getValidTo().toString());
-            artifact.setAttribute(DeviceManagementConstants.LicenseProperties.VALID_FROM,
-                    license.getValidFrom().toString());
+            Date validTo = license.getValidTo();
+            if (validTo != null) {
+                artifact.setAttribute(DeviceManagementConstants.LicenseProperties.VALID_TO, validTo.toString());
+            }
+            Date validFrom = license.getValidFrom();
+            if (validFrom != null) {
+                artifact.setAttribute(DeviceManagementConstants.LicenseProperties.VALID_FROM, validFrom.toString());
+            }
             artifactManager.addGenericArtifact(artifact);
         } catch (GovernanceException e) {
             throw new LicenseManagementException("Error occurred while adding license for device type " +