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/scripting/reactor/ReactorScriptManager.java

@@ -22,6 +22,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 package scripting.reactor;
 
 import client.MapleClient;
+import java.sql.Connection;
 import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.util.HashMap;
@@ -82,7 +83,8 @@ public class ReactorScriptManager extends AbstractScriptManager {
         if (ret == null) {
             ret = new LinkedList<>();
             try {
-                try (PreparedStatement ps = DatabaseConnection.getConnection().prepareStatement("SELECT itemid, chance, questid FROM reactordrops WHERE reactorid = ? AND chance >= 0")) {
+                Connection con = DatabaseConnection.getConnection();
+                try (PreparedStatement ps = con.prepareStatement("SELECT itemid, chance, questid FROM reactordrops WHERE reactorid = ? AND chance >= 0")) {
                     ps.setInt(1, rid);
                     try (ResultSet rs = ps.executeQuery()) {
                         while (rs.next()) {
@@ -90,6 +92,8 @@ public class ReactorScriptManager extends AbstractScriptManager {
                         }
                     }
                 }
+                
+                con.close();
             } catch (Throwable e) {
                 FilePrinter.printError(FilePrinter.REACTOR + rid + ".txt", e);
             }