NullPointerException when close a ResultSet of getColumns()

[Weiqing Xu]

When I close the ResultSet of GetColumns(), it will throw a NullPointerException. Here is the java code.

                DatabaseMetaData dbmd = conn.getMetaData();
  ResultSet res = dbmd.getColumns(null, null, "QATABU", null);
  ResultSetMetaData rsMd = res.getMetaData();
  System.out.println("");
  System.out.println("No. of Columns " + rsMd.getColumnCount());
  for (int j = 1; j <= rsMd.getColumnCount(); j++) {
   System.out.println("Column " + j
     + " DataType: " + rsMd.getColumnTypeName(j)
     + "Name: " + rsMd.getColumnName(j));
  }
  res.close();
  conn.close();