Fixing NPE in AndroidAPIUtils

resolved #616

components/mobile-plugins/windows-plugin/org.wso2.carbon.device.mgt.mobile.windows.api/src/main/java/org/wso2/carbon/device/mgt/mobile/windows/api/services/ConfigurationMgtService.java

@@ -209,9 +209,9 @@ public interface ConfigurationMgtService {
 
     @GET
     @Path("license")
-    @Produces(MediaType.APPLICATION_JSON)
+    @Produces(MediaType.TEXT_PLAIN)
     @ApiOperation(
-            produces = MediaType.APPLICATION_JSON,
+            produces = MediaType.TEXT_PLAIN,
             httpMethod = "GET",
             value = "Getting the License Agreement to Register a Windows Device",
             notes = "Use this REST API to retrieve the license agreement that is used for the Windows device " +

components/mobile-plugins/windows-plugin/org.wso2.carbon.device.mgt.mobile.windows.api/src/main/java/org/wso2/carbon/device/mgt/mobile/windows/api/services/impl/ConfigurationMgtServiceImpl.java

@@ -98,9 +98,10 @@ public class ConfigurationMgtServiceImpl implements ConfigurationMgtService {
      * @throws WindowsConfigurationException
      */
     @PUT
-    public Response updateConfiguration(PlatformConfiguration configuration) throws WindowsConfigurationException {
+    public Response updateConfiguration(PlatformConfiguration windowsPlatformConfiguration) throws WindowsConfigurationException {
         String message;
         ConfigurationEntry licenseEntry = null;
+        PlatformConfiguration configuration = new PlatformConfiguration();
         try {
             configuration.setType(DeviceManagementConstants.MobileDeviceTypes.MOBILE_DEVICE_TYPE_WINDOWS);
             List<ConfigurationEntry> configs = configuration.getConfiguration();