fixing validation issue

components/mobile-plugins/android-plugin/org.wso2.carbon.device.mgt.mobile.android.api/src/main/java/org/wso2/carbon/mdm/services/android/services/DeviceTypeConfigurationService.java

@@ -23,6 +23,7 @@ import org.wso2.carbon.device.mgt.common.configuration.mgt.PlatformConfiguration
 import org.wso2.carbon.mdm.services.android.bean.AndroidPlatformConfiguration;
 import org.wso2.carbon.mdm.services.android.exception.AndroidAgentException;
 
+import javax.validation.Valid;
 import javax.ws.rs.*;
 import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
@@ -126,7 +127,7 @@ public interface DeviceTypeConfigurationService {
     Response updateConfiguration(
             @ApiParam(name = "configuration",
                     value = "AndroidPlatformConfiguration")
-            AndroidPlatformConfiguration androidPlatformConfiguration);
+            @Valid AndroidPlatformConfiguration androidPlatformConfiguration);
 
     @GET
     @Path("license")