1 files changed, 7 insertions, 12 deletions
diff --git a/src/org/traccar/database/GroupsManager.java b/src/org/traccar/database/GroupsManager.java
index 095e7a22c..20b403d55 100644
--- a/src/org/traccar/database/GroupsManager.java
+++ b/src/org/traccar/database/GroupsManager.java
@@ -26,7 +26,7 @@ import org.traccar.helper.Log;
 import org.traccar.model.BaseModel;
 import org.traccar.model.Group;
 
-public class GroupsManager extends BaseObjectManager implements ManagableObjects {
+public class GroupsManager extends BaseObjectManager<Group> implements ManagableObjects {
 
     private AtomicLong groupsLastUpdate = new AtomicLong();
     private final long dataRefreshDelay;
@@ -37,11 +37,6 @@ public class GroupsManager extends BaseObjectManager implements ManagableObjects
                 DeviceManager.DEFAULT_REFRESH_DELAY) * 1000;
     }
 
-    @Override
-    public Group getById(long groupId) {
-        return (Group) super.getById(groupId);
-    }
-
     private void checkGroupCycles(BaseModel group) {
         Set<Long> groups = new HashSet<>();
         while (group != null) {
@@ -76,15 +71,15 @@ public class GroupsManager extends BaseObjectManager implements ManagableObjects
     }
 
     @Override
-    protected void addNewItem(BaseModel item) {
-        checkGroupCycles(item);
-        super.addNewItem(item);
+    protected void addNewItem(Group group) {
+        checkGroupCycles(group);
+        super.addNewItem(group);
     }
 
     @Override
-    protected void updateCachedItem(BaseModel item) {
-        checkGroupCycles(item);
-        super.updateCachedItem(item);
+    protected void updateCachedItem(Group group) {
+        checkGroupCycles(group);
+        super.updateCachedItem(group);
     }
 
     @Override