Make use of a LinkedList to store faster used ids.

L2J_Mobius_01.0_Ertheia/java/org/l2jmobius/gameserver/instancemanager/IdManager.java

@@ -21,8 +21,8 @@ import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.Statement;
 import java.util.BitSet;
-import java.util.HashSet;
+import java.util.LinkedList;
-import java.util.Set;
+import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.logging.Logger;
 
@@ -190,7 +190,7 @@ public class IdManager
 			_freeIdCount = new AtomicInteger(FREE_OBJECT_ID_SIZE);
 			
 			// Collect already used ids.
-			final Set<Integer> usedIds = new HashSet<>();
+			final List<Integer> usedIds = new LinkedList<>();
 			try (Connection con = DatabaseFactory.getConnection();
 				Statement statement = con.createStatement())
 			{

L2J_Mobius_02.5_Underground/java/org/l2jmobius/gameserver/instancemanager/IdManager.java

@@ -21,8 +21,8 @@ import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.Statement;
 import java.util.BitSet;
-import java.util.HashSet;
+import java.util.LinkedList;
-import java.util.Set;
+import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.logging.Logger;
 
@@ -190,7 +190,7 @@ public class IdManager
 			_freeIdCount = new AtomicInteger(FREE_OBJECT_ID_SIZE);
 			
 			// Collect already used ids.
-			final Set<Integer> usedIds = new HashSet<>();
+			final List<Integer> usedIds = new LinkedList<>();
 			try (Connection con = DatabaseFactory.getConnection();
 				Statement statement = con.createStatement())
 			{

L2J_Mobius_03.0_Helios/java/org/l2jmobius/gameserver/instancemanager/IdManager.java

@@ -21,8 +21,8 @@ import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.Statement;
 import java.util.BitSet;
-import java.util.HashSet;
+import java.util.LinkedList;
-import java.util.Set;
+import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.logging.Logger;
 
@@ -190,7 +190,7 @@ public class IdManager
 			_freeIdCount = new AtomicInteger(FREE_OBJECT_ID_SIZE);
 			
 			// Collect already used ids.
-			final Set<Integer> usedIds = new HashSet<>();
+			final List<Integer> usedIds = new LinkedList<>();
 			try (Connection con = DatabaseFactory.getConnection();
 				Statement statement = con.createStatement())
 			{

L2J_Mobius_04.0_GrandCrusade/java/org/l2jmobius/gameserver/instancemanager/IdManager.java

@@ -21,8 +21,8 @@ import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.Statement;
 import java.util.BitSet;
-import java.util.HashSet;
+import java.util.LinkedList;
-import java.util.Set;
+import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.logging.Logger;
 
@@ -190,7 +190,7 @@ public class IdManager
 			_freeIdCount = new AtomicInteger(FREE_OBJECT_ID_SIZE);
 			
 			// Collect already used ids.
-			final Set<Integer> usedIds = new HashSet<>();
+			final List<Integer> usedIds = new LinkedList<>();
 			try (Connection con = DatabaseFactory.getConnection();
 				Statement statement = con.createStatement())
 			{

L2J_Mobius_05.0_Salvation/java/org/l2jmobius/gameserver/instancemanager/IdManager.java

@@ -21,8 +21,8 @@ import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.Statement;
 import java.util.BitSet;
-import java.util.HashSet;
+import java.util.LinkedList;
-import java.util.Set;
+import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.logging.Logger;
 
@@ -190,7 +190,7 @@ public class IdManager
 			_freeIdCount = new AtomicInteger(FREE_OBJECT_ID_SIZE);
 			
 			// Collect already used ids.
-			final Set<Integer> usedIds = new HashSet<>();
+			final List<Integer> usedIds = new LinkedList<>();
 			try (Connection con = DatabaseFactory.getConnection();
 				Statement statement = con.createStatement())
 			{

L2J_Mobius_05.5_EtinasFate/java/org/l2jmobius/gameserver/instancemanager/IdManager.java

@@ -21,8 +21,8 @@ import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.Statement;
 import java.util.BitSet;
-import java.util.HashSet;
+import java.util.LinkedList;
-import java.util.Set;
+import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.logging.Logger;
 
@@ -190,7 +190,7 @@ public class IdManager
 			_freeIdCount = new AtomicInteger(FREE_OBJECT_ID_SIZE);
 			
 			// Collect already used ids.
-			final Set<Integer> usedIds = new HashSet<>();
+			final List<Integer> usedIds = new LinkedList<>();
 			try (Connection con = DatabaseFactory.getConnection();
 				Statement statement = con.createStatement())
 			{

L2J_Mobius_06.0_Fafurion/java/org/l2jmobius/gameserver/instancemanager/IdManager.java

@@ -21,8 +21,8 @@ import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.Statement;
 import java.util.BitSet;
-import java.util.HashSet;
+import java.util.LinkedList;
-import java.util.Set;
+import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.logging.Logger;
 
@@ -190,7 +190,7 @@ public class IdManager
 			_freeIdCount = new AtomicInteger(FREE_OBJECT_ID_SIZE);
 			
 			// Collect already used ids.
-			final Set<Integer> usedIds = new HashSet<>();
+			final List<Integer> usedIds = new LinkedList<>();
 			try (Connection con = DatabaseFactory.getConnection();
 				Statement statement = con.createStatement())
 			{

L2J_Mobius_07.0_PreludeOfWar/java/org/l2jmobius/gameserver/instancemanager/IdManager.java

@@ -21,8 +21,8 @@ import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.Statement;
 import java.util.BitSet;
-import java.util.HashSet;
+import java.util.LinkedList;
-import java.util.Set;
+import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.logging.Logger;
 
@@ -190,7 +190,7 @@ public class IdManager
 			_freeIdCount = new AtomicInteger(FREE_OBJECT_ID_SIZE);
 			
 			// Collect already used ids.
-			final Set<Integer> usedIds = new HashSet<>();
+			final List<Integer> usedIds = new LinkedList<>();
 			try (Connection con = DatabaseFactory.getConnection();
 				Statement statement = con.createStatement())
 			{

L2J_Mobius_08.2_Homunculus/java/org/l2jmobius/gameserver/instancemanager/IdManager.java

@@ -21,8 +21,8 @@ import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.Statement;
 import java.util.BitSet;
-import java.util.HashSet;
+import java.util.LinkedList;
-import java.util.Set;
+import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.logging.Logger;
 
@@ -190,7 +190,7 @@ public class IdManager
 			_freeIdCount = new AtomicInteger(FREE_OBJECT_ID_SIZE);
 			
 			// Collect already used ids.
-			final Set<Integer> usedIds = new HashSet<>();
+			final List<Integer> usedIds = new LinkedList<>();
 			try (Connection con = DatabaseFactory.getConnection();
 				Statement statement = con.createStatement())
 			{

L2J_Mobius_09.2_ReturnOfTheQueenAnt/java/org/l2jmobius/gameserver/instancemanager/IdManager.java

@@ -21,8 +21,8 @@ import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.Statement;
 import java.util.BitSet;
-import java.util.HashSet;
+import java.util.LinkedList;
-import java.util.Set;
+import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.logging.Logger;
 
@@ -190,7 +190,7 @@ public class IdManager
 			_freeIdCount = new AtomicInteger(FREE_OBJECT_ID_SIZE);
 			
 			// Collect already used ids.
-			final Set<Integer> usedIds = new HashSet<>();
+			final List<Integer> usedIds = new LinkedList<>();
 			try (Connection con = DatabaseFactory.getConnection();
 				Statement statement = con.createStatement())
 			{

L2J_Mobius_10.2_MasterClass/java/org/l2jmobius/gameserver/instancemanager/IdManager.java

@@ -21,8 +21,8 @@ import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.Statement;
 import java.util.BitSet;
-import java.util.HashSet;
+import java.util.LinkedList;
-import java.util.Set;
+import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.logging.Logger;
 
@@ -190,7 +190,7 @@ public class IdManager
 			_freeIdCount = new AtomicInteger(FREE_OBJECT_ID_SIZE);
 			
 			// Collect already used ids.
-			final Set<Integer> usedIds = new HashSet<>();
+			final List<Integer> usedIds = new LinkedList<>();
 			try (Connection con = DatabaseFactory.getConnection();
 				Statement statement = con.createStatement())
 			{

L2J_Mobius_C4_ScionsOfDestiny/java/org/l2jmobius/gameserver/instancemanager/IdManager.java

@@ -21,8 +21,8 @@ import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.Statement;
 import java.util.BitSet;
-import java.util.HashSet;
+import java.util.LinkedList;
-import java.util.Set;
+import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.logging.Logger;
 
@@ -156,7 +156,7 @@ public class IdManager
 			_freeIdCount = new AtomicInteger(FREE_OBJECT_ID_SIZE);
 			
 			// Collect already used ids.
-			final Set<Integer> usedIds = new HashSet<>();
+			final List<Integer> usedIds = new LinkedList<>();
 			try (Connection con = DatabaseFactory.getConnection();
 				Statement statement = con.createStatement())
 			{

L2J_Mobius_C6_Interlude/java/org/l2jmobius/gameserver/instancemanager/IdManager.java

@@ -21,8 +21,8 @@ import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.Statement;
 import java.util.BitSet;
-import java.util.HashSet;
+import java.util.LinkedList;
-import java.util.Set;
+import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.logging.Logger;
 
@@ -157,7 +157,7 @@ public class IdManager
 			_freeIdCount = new AtomicInteger(FREE_OBJECT_ID_SIZE);
 			
 			// Collect already used ids.
-			final Set<Integer> usedIds = new HashSet<>();
+			final List<Integer> usedIds = new LinkedList<>();
 			try (Connection con = DatabaseFactory.getConnection();
 				Statement statement = con.createStatement())
 			{

L2J_Mobius_CT_0_Interlude/java/org/l2jmobius/gameserver/instancemanager/IdManager.java

@@ -21,8 +21,8 @@ import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.Statement;
 import java.util.BitSet;
-import java.util.HashSet;
+import java.util.LinkedList;
-import java.util.Set;
+import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.logging.Logger;
 
@@ -204,7 +204,7 @@ public class IdManager
 			_freeIdCount = new AtomicInteger(FREE_OBJECT_ID_SIZE);
 			
 			// Collect already used ids.
-			final Set<Integer> usedIds = new HashSet<>();
+			final List<Integer> usedIds = new LinkedList<>();
 			try (Connection con = DatabaseFactory.getConnection();
 				Statement statement = con.createStatement())
 			{

L2J_Mobius_CT_2.4_Epilogue/java/org/l2jmobius/gameserver/instancemanager/IdManager.java

@@ -21,8 +21,8 @@ import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.Statement;
 import java.util.BitSet;
-import java.util.HashSet;
+import java.util.LinkedList;
-import java.util.Set;
+import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.logging.Logger;
 
@@ -209,7 +209,7 @@ public class IdManager
 			_freeIdCount = new AtomicInteger(FREE_OBJECT_ID_SIZE);
 			
 			// Collect already used ids.
-			final Set<Integer> usedIds = new HashSet<>();
+			final List<Integer> usedIds = new LinkedList<>();
 			try (Connection con = DatabaseFactory.getConnection();
 				Statement statement = con.createStatement())
 			{

L2J_Mobius_CT_2.6_HighFive/java/org/l2jmobius/gameserver/instancemanager/IdManager.java

@@ -21,8 +21,8 @@ import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.Statement;
 import java.util.BitSet;
-import java.util.HashSet;
+import java.util.LinkedList;
-import java.util.Set;
+import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.logging.Logger;
 
@@ -208,7 +208,7 @@ public class IdManager
 			_freeIdCount = new AtomicInteger(FREE_OBJECT_ID_SIZE);
 			
 			// Collect already used ids.
-			final Set<Integer> usedIds = new HashSet<>();
+			final List<Integer> usedIds = new LinkedList<>();
 			try (Connection con = DatabaseFactory.getConnection();
 				Statement statement = con.createStatement())
 			{

L2J_Mobius_Classic_1.0/java/org/l2jmobius/gameserver/instancemanager/IdManager.java

@@ -21,8 +21,8 @@ import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.Statement;
 import java.util.BitSet;
-import java.util.HashSet;
+import java.util.LinkedList;
-import java.util.Set;
+import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.logging.Logger;
 
@@ -190,7 +190,7 @@ public class IdManager
 			_freeIdCount = new AtomicInteger(FREE_OBJECT_ID_SIZE);
 			
 			// Collect already used ids.
-			final Set<Integer> usedIds = new HashSet<>();
+			final List<Integer> usedIds = new LinkedList<>();
 			try (Connection con = DatabaseFactory.getConnection();
 				Statement statement = con.createStatement())
 			{

L2J_Mobius_Classic_1.5_AgeOfSplendor/java/org/l2jmobius/gameserver/instancemanager/IdManager.java

@@ -21,8 +21,8 @@ import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.Statement;
 import java.util.BitSet;
-import java.util.HashSet;
+import java.util.LinkedList;
-import java.util.Set;
+import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.logging.Logger;
 
@@ -190,7 +190,7 @@ public class IdManager
 			_freeIdCount = new AtomicInteger(FREE_OBJECT_ID_SIZE);
 			
 			// Collect already used ids.
-			final Set<Integer> usedIds = new HashSet<>();
+			final List<Integer> usedIds = new LinkedList<>();
 			try (Connection con = DatabaseFactory.getConnection();
 				Statement statement = con.createStatement())
 			{

L2J_Mobius_Classic_2.0_Saviors/java/org/l2jmobius/gameserver/instancemanager/IdManager.java

@@ -21,8 +21,8 @@ import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.Statement;
 import java.util.BitSet;
-import java.util.HashSet;
+import java.util.LinkedList;
-import java.util.Set;
+import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.logging.Logger;
 
@@ -190,7 +190,7 @@ public class IdManager
 			_freeIdCount = new AtomicInteger(FREE_OBJECT_ID_SIZE);
 			
 			// Collect already used ids.
-			final Set<Integer> usedIds = new HashSet<>();
+			final List<Integer> usedIds = new LinkedList<>();
 			try (Connection con = DatabaseFactory.getConnection();
 				Statement statement = con.createStatement())
 			{

L2J_Mobius_Classic_2.5_Zaken/java/org/l2jmobius/gameserver/instancemanager/IdManager.java

@@ -21,8 +21,8 @@ import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.Statement;
 import java.util.BitSet;
-import java.util.HashSet;
+import java.util.LinkedList;
-import java.util.Set;
+import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.logging.Logger;
 
@@ -190,7 +190,7 @@ public class IdManager
 			_freeIdCount = new AtomicInteger(FREE_OBJECT_ID_SIZE);
 			
 			// Collect already used ids.
-			final Set<Integer> usedIds = new HashSet<>();
+			final List<Integer> usedIds = new LinkedList<>();
 			try (Connection con = DatabaseFactory.getConnection();
 				Statement statement = con.createStatement())
 			{

L2J_Mobius_Classic_2.7_Antharas/java/org/l2jmobius/gameserver/instancemanager/IdManager.java

@@ -21,8 +21,8 @@ import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.Statement;
 import java.util.BitSet;
-import java.util.HashSet;
+import java.util.LinkedList;
-import java.util.Set;
+import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.logging.Logger;
 
@@ -190,7 +190,7 @@ public class IdManager
 			_freeIdCount = new AtomicInteger(FREE_OBJECT_ID_SIZE);
 			
 			// Collect already used ids.
-			final Set<Integer> usedIds = new HashSet<>();
+			final List<Integer> usedIds = new LinkedList<>();
 			try (Connection con = DatabaseFactory.getConnection();
 				Statement statement = con.createStatement())
 			{

L2J_Mobius_Classic_2.8_SevenSigns/java/org/l2jmobius/gameserver/instancemanager/IdManager.java

@@ -21,8 +21,8 @@ import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.Statement;
 import java.util.BitSet;
-import java.util.HashSet;
+import java.util.LinkedList;
-import java.util.Set;
+import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.logging.Logger;
 
@@ -190,7 +190,7 @@ public class IdManager
 			_freeIdCount = new AtomicInteger(FREE_OBJECT_ID_SIZE);
 			
 			// Collect already used ids.
-			final Set<Integer> usedIds = new HashSet<>();
+			final List<Integer> usedIds = new LinkedList<>();
 			try (Connection con = DatabaseFactory.getConnection();
 				Statement statement = con.createStatement())
 			{

L2J_Mobius_Classic_2.9.5_Saviors/java/org/l2jmobius/gameserver/instancemanager/IdManager.java

@@ -21,8 +21,8 @@ import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.Statement;
 import java.util.BitSet;
-import java.util.HashSet;
+import java.util.LinkedList;
-import java.util.Set;
+import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.logging.Logger;
 
@@ -190,7 +190,7 @@ public class IdManager
 			_freeIdCount = new AtomicInteger(FREE_OBJECT_ID_SIZE);
 			
 			// Collect already used ids.
-			final Set<Integer> usedIds = new HashSet<>();
+			final List<Integer> usedIds = new LinkedList<>();
 			try (Connection con = DatabaseFactory.getConnection();
 				Statement statement = con.createStatement())
 			{

L2J_Mobius_Classic_2.9_SecretOfEmpire/java/org/l2jmobius/gameserver/instancemanager/IdManager.java

@@ -21,8 +21,8 @@ import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.Statement;
 import java.util.BitSet;
-import java.util.HashSet;
+import java.util.LinkedList;
-import java.util.Set;
+import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.logging.Logger;
 
@@ -190,7 +190,7 @@ public class IdManager
 			_freeIdCount = new AtomicInteger(FREE_OBJECT_ID_SIZE);
 			
 			// Collect already used ids.
-			final Set<Integer> usedIds = new HashSet<>();
+			final List<Integer> usedIds = new LinkedList<>();
 			try (Connection con = DatabaseFactory.getConnection();
 				Statement statement = con.createStatement())
 			{

L2J_Mobius_Classic_3.0_TheKamael/java/org/l2jmobius/gameserver/instancemanager/IdManager.java

@@ -21,8 +21,8 @@ import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.Statement;
 import java.util.BitSet;
-import java.util.HashSet;
+import java.util.LinkedList;
-import java.util.Set;
+import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.logging.Logger;
 
@@ -190,7 +190,7 @@ public class IdManager
 			_freeIdCount = new AtomicInteger(FREE_OBJECT_ID_SIZE);
 			
 			// Collect already used ids.
-			final Set<Integer> usedIds = new HashSet<>();
+			final List<Integer> usedIds = new LinkedList<>();
 			try (Connection con = DatabaseFactory.getConnection();
 				Statement statement = con.createStatement())
 			{

L2J_Mobius_Classic_Interlude/java/org/l2jmobius/gameserver/instancemanager/IdManager.java

@@ -21,8 +21,8 @@ import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.Statement;
 import java.util.BitSet;
-import java.util.HashSet;
+import java.util.LinkedList;
-import java.util.Set;
+import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.logging.Logger;
 
@@ -189,7 +189,7 @@ public class IdManager
 			_freeIdCount = new AtomicInteger(FREE_OBJECT_ID_SIZE);
 			
 			// Collect already used ids.
-			final Set<Integer> usedIds = new HashSet<>();
+			final List<Integer> usedIds = new LinkedList<>();
 			try (Connection con = DatabaseFactory.getConnection();
 				Statement statement = con.createStatement())
 			{

L2J_Mobius_Essence_4.2_DwellingOfSpirits/java/org/l2jmobius/gameserver/instancemanager/IdManager.java

@@ -21,8 +21,8 @@ import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.Statement;
 import java.util.BitSet;
-import java.util.HashSet;
+import java.util.LinkedList;
-import java.util.Set;
+import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.logging.Logger;
 
@@ -190,7 +190,7 @@ public class IdManager
 			_freeIdCount = new AtomicInteger(FREE_OBJECT_ID_SIZE);
 			
 			// Collect already used ids.
-			final Set<Integer> usedIds = new HashSet<>();
+			final List<Integer> usedIds = new LinkedList<>();
 			try (Connection con = DatabaseFactory.getConnection();
 				Statement statement = con.createStatement())
 			{

L2J_Mobius_Essence_5.2_FrostLord/java/org/l2jmobius/gameserver/instancemanager/IdManager.java

@@ -21,8 +21,8 @@ import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.Statement;
 import java.util.BitSet;
-import java.util.HashSet;
+import java.util.LinkedList;
-import java.util.Set;
+import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.logging.Logger;
 
@@ -190,7 +190,7 @@ public class IdManager
 			_freeIdCount = new AtomicInteger(FREE_OBJECT_ID_SIZE);
 			
 			// Collect already used ids.
-			final Set<Integer> usedIds = new HashSet<>();
+			final List<Integer> usedIds = new LinkedList<>();
 			try (Connection con = DatabaseFactory.getConnection();
 				Statement statement = con.createStatement())
 			{

L2J_Mobius_Essence_6.2_Vanguard/java/org/l2jmobius/gameserver/instancemanager/IdManager.java

@@ -21,8 +21,8 @@ import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.Statement;
 import java.util.BitSet;
-import java.util.HashSet;
+import java.util.LinkedList;
-import java.util.Set;
+import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.logging.Logger;
 
@@ -190,7 +190,7 @@ public class IdManager
 			_freeIdCount = new AtomicInteger(FREE_OBJECT_ID_SIZE);
 			
 			// Collect already used ids.
-			final Set<Integer> usedIds = new HashSet<>();
+			final List<Integer> usedIds = new LinkedList<>();
 			try (Connection con = DatabaseFactory.getConnection();
 				Statement statement = con.createStatement())
 			{