Java API GetPrinters() incorrect

[Benjamin Wagner]

Hi all,

i want to use the CUPS Java API in my web app to print some file on the server side. Im using CUPS 1.1.23, Java 1.5, JBoss 4.0.3SP1 all running on a suse 9.3 system. I have 2 Problems:

1. this seems to me a bug in the API:
somtimes the cups.cupsGetPrinters() seems to hang - like its waiting for a response. The problem is in the 'case REQ_STATE_READ_RESPONSE:' Block of the Cups.doRequest() function:
when the http.read_header() function returns 0 while the http.status is OK (which is sometimes the case for me), the state flag is never changed and the loop is never ended - the http.read_header() function is called over and over again.
I made 2 changes to fix it:
a) added these two lines (line 750-755 including comments)
  case REQ_STATE_READ_RESPONSE:
+    if (http.status == IPPHttp.HTTP_OK)
+        http.status = 0;
    read_length = http.read_header();

b) changed (line 781 - 786)
if ((read_length > 0) && (state == REQ_STATE_READ_RESPONSE))
{
    http.read_buffer = http.read(read_length);
    ipp = http.processResponse();
    state++;
}
into
if (state == REQ_STATE_READ_RESPONSE)
{
    if (read_length == 0) {
        return false;
    }
    http.read_buffer = http.read(read_length);
    ipp = http.processResponse();
    state++;
}


2. this is related to the first problem, but i don't know why it happens:
Sometimes i get the list with all the printers and sometimes i don't - nearly every second time. It happends when the http.read_header() function returns 0. So i added some debug outputs in this function, but in these cases there is no response (http.read_line() returns an empty string). It strange to my, since i have no problem to create a printer object by setting the printer name manualy - i get its attributes and can start print jobs. Any ideas??

regards
Ben