Adding the specific imports.

components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/service/GroupManagementProviderService.java

@@ -23,7 +23,11 @@ import org.wso2.carbon.device.mgt.common.DeviceIdentifier;
 import org.wso2.carbon.device.mgt.common.DeviceNotFoundException;
 import org.wso2.carbon.device.mgt.common.GroupPaginationRequest;
 import org.wso2.carbon.device.mgt.common.PaginationResult;
-import org.wso2.carbon.device.mgt.common.group.mgt.*;
+import org.wso2.carbon.device.mgt.common.group.mgt.DeviceGroup;
+import org.wso2.carbon.device.mgt.common.group.mgt.GroupAlreadyExistException;
+import org.wso2.carbon.device.mgt.common.group.mgt.GroupManagementException;
+import org.wso2.carbon.device.mgt.common.group.mgt.RoleDoesNotExistException;
+import org.wso2.carbon.device.mgt.common.group.mgt.GroupNotExistException;
 
 import java.util.List;