Experimental DB pool + fixed stat overflow on equips

Implemented EXPERIMENTAL DBCP (connection pool), trying to improve
concorrent access to DB. Added door portals on Kerning Square. Fixed
equipments getting stat overflow when upgrading stats. Fixed expiring
pets crashing the client in some cases.

src/net/server/handlers/login/ViewCharHandler.java

@@ -23,6 +23,7 @@ package net.server.handlers.login;
 
 import client.MapleCharacter;
 import client.MapleClient;
+import java.sql.Connection;
 import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.util.ArrayList;
@@ -40,7 +41,9 @@ public final class ViewCharHandler extends AbstractMaplePacketHandler {
             short charsNum;
             List<Integer> worlds;
             List<MapleCharacter> chars;
-            try (PreparedStatement ps = DatabaseConnection.getConnection().prepareStatement("SELECT world, id FROM characters WHERE accountid = ?")) {
+            
+            Connection con = DatabaseConnection.getConnection();
+            try (PreparedStatement ps = con.prepareStatement("SELECT world, id FROM characters WHERE accountid = ?")) {
                 ps.setInt(1, c.getAccID());
                 charsNum = 0;
                 worlds = new ArrayList<>();
@@ -75,6 +78,8 @@ public final class ViewCharHandler extends AbstractMaplePacketHandler {
                 }
                 c.announce(MaplePacketCreator.showAllCharacterInfo(w, chrsinworld));
             }
+            
+            con.close();
         } catch (Exception e) {
             e.printStackTrace();
         }