IMAGEIO.write, create an empty file on my filesystem

hi,
I'm trying to write an image to my filesystem using this method, but it just create an empty BMP file.
I can't understand why.. I'm sure that I getAsBufferedImage returns a BufferedImage (I checked the raster in debug mode)
ImageIO.write(planarImage.getAsBufferedImage(), "BMP", new File(pathname));thank you
bye

Thank you. I'm in 8i.
SQL> SET head off
SQL> SET pagesize 0
SQL> SET verify off
SQL> SET feedback off
SQL> SET serverout on
SQL> SPOOL empty_file.txt
SQL> BEGIN
2 DBMS_OUTPUT.put_line (RPAD (' ', 2000, ' '));
3 END;
4 /
BEGIN
ERROR at line 1:
ORA-06502: PL/SQL: numeric or value error
ORA-06512: at "SYS.DBMS_OUTPUT", line 57
ORA-06512: at line 2
Any solution ?

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Thank you. I'm in 8i.
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