use ColumnType sample type also as return type in RacingEventService

java/com.sap.sailing.server/src/com/sap/sailing/server/RacingEventService.java

@@ -188,5 +188,5 @@ public interface RacingEventService extends TrackedEventRegistry {
     
     void storeSwissTimingDummyRace(String racMessage, String stlMesssage, String ccgMessage) throws IllegalArgumentException;
 
-    Object getData(ColumnType columnType);
+    ColumnType getData(ColumnType columnType);
 }

java/com.sap.sailing.server/src/com/sap/sailing/server/impl/RacingEventServiceImpl.java

@@ -508,7 +508,7 @@ public class RacingEventServiceImpl implements RacingEventService {
     }
 
     @Override
-    public Object getData(ColumnType columnType) {
+    public ColumnType getData(ColumnType columnType) {
         logger.info("RacingEventServerImpl.getData("+columnType+") was called");
         return null;
     }