docs: public static int forceCleanup(Thread t)
      {
          int i = 0;
          for (Map.Entry<ConnectionPool, Set<ConnPair>> e : conns.entrySet())
          {
              for (ConnPair c : e.getValue())
              {
                  if (c.thread.equals(t))
                  {
                      try
                      {
                          // This will in turn remove it from the static Map.
                          c.conn.getHandler().invoke(c.conn, Connection.class.getMethod("close"), null);
                      }
                      catch (Throwable e1)
                      {
                          e1.printStackTrace();
                      }
                      i++;
                  }
              }
          }
          return i;
      }