连接持续增加，不能释放，请帮忙看看是不是递归引起？

/* 判断该类别下面是否有子类别 */public boolean HasSon(int parent) throws SQLException, NamingException
    {
        Connection conn=null;
        PreparedStatement pstmt = null;
        ResultSet rs=null;
        int i=0;
        try
        {
            String sql="select count(*) total from procat where parent=?";
            conn = pool.getConnection();
            pstmt = conn.prepareStatement(sql);
            pstmt .setInt(1,parent);
            rs=pstmt.executeQuery();
            if(rs.next()){
              i = rs.getInt("total");
            }            
        }
        finally{
            pool.cleanup(conn,pstmt,rs);
        }
        return i>0;
   }/*按照深度得到当前类别下面所有类别,递归调用 */public void getCatalog(ArrayList list, int parent,int depth) throws SQLException,NamingException
    {
        Connection conn=null;
        PreparedStatement pstmt = null; 
        ResultSet rs=null;    
        String sql="select * from procat where parent=? order by pos desc,catid desc";
        try{
            conn=pool.getConnection();
            pstmt=conn.prepareStatement(sql);
            pstmt.setInt(1,parent);
            rs = pstmt.executeQuery();
            while (rs.next()){
                CatalogMsg m=new CatalogMsg();
                m.setCatID(rs.getInt("catID"));
                m.setCatName(rs.getString("catName"));
                m.setPos(depth);
                list.add(m);
                boolean hasson = HasSon(rs.getInt("catID"));
                if(hasson){
                    getCatalog(list,rs.getInt("catID"),depth+1);
                }
            }
        }finally
        {
            pool.cleanup(conn,pstmt,rs);    
        }
    }
/* cleanup 释放连接 */
public void cleanup(Connection databaseConnection,
                        Statement statement1,ResultSet resultSet) throws SQLException {
        try {
            // Close the database connection and statement
            if (statement1 != null) {
                statement1.close();
            }
            if (resultSet  !=null)
            {
                resultSet.close();
            }
        }
        finally {
            // Make sure we always try to close the connection, even
            // if something went wrong trying to close a statement
            if (databaseConnection != null) {
                databaseConnection.close();
            }
        }
  }
数据库是oralce9i,用SELECT sql_text,COUNT(*) FROM v$sql s , v$session se WHERE se.prev_hash_value =s.hash_value GROUP BY sql_text,检查连接发现 SQL_text                                              count 
     select count(*) total from procat where parent=:1       6count 会持续增加，最高曾达到90，导致连接数过多，增加oracle连接数指标不治本,请问如何修改程序？