Hi,
I have a mystery case that with missing bytes when read servlet inputstream.
I have hard time to pin point the cause and put an effective debugging code.
Any one has insight or suggestion on this would be very much appreciated.
I use apache web server and Jsev 1.1.2. The server receives lots email or
data uploading.
The incoming requests are in XML format and feed to SAXParser upon arrival.
Everyday, I now constantly get about 50 or more exceptions thrown from SAX Parser
complaining either truncated data or no data at all(the input to parser is
ServletInputStream
wrapped by a InputStreamReader and bufferedReader).
In all of these missing bytes cases, the content length from HttpServletRequest
were always set properly and provide no clue. If I try to read inputstream
to a buffer before parse, when encounter missing bytes, the read() operation
would not return till 5 minutes later.(seems like a time out from the socket read).
Same delay would happen in parsing if I do not read out in forehand.
5 minutes is a long time (it takes less than 100ms in normal case for read out),
I tried to use Inputstream.available(), it returned right away, but it returns
same thing as the ContentLength, even though I found missing or no bytes
when read them out.
I would really like to nail down where and why these data get lost.
And for now, I am struggling to find a dependable way to detect this
condition without such long delay.
Here is some relevant code:
BufferedReader rd = new BufferedReader(
new InputStreamReader(Decompressor.decompressData(
Decompressor.ZLIB_COMPRESSED, inputstream) ) );
// debugging code, try to read input out
CharArrayWriter writer = new CharArrayWriter();
char bytes[] = new char[contentLen];
while(true) {
// this read will take 5 minutes if the missing bytes happening
bytesRead = rd.read(bytes, 0, contentLen);
if (bytesRead == -1) {
break;
}
writer.write(bytes, 0, bytesRead);
}
Reader reader = new CharArrayReader(writer.toCharArray());
InputSource = new InputSource(reader);
parser = new ValidatingParser ();
parser.setErrorHandler (SAXErrorHandler.errorHandler);
// the exceptions were thrown from here if I do not read them out
parser.parse (in);
Thank you in advance for helping!
Dunping
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