I think I have found a problem in the IO taglib.
I have a site where I use JSP with JSTL and the IO taglibs to provide a
web frount end to a servlet which takes XML requests and delivers
XML responses (this is used by some embedded systems as well as
the web UI).
Every now and then I get a null response back from the servlet when
using the IO taglib. The embedded systems never hit this problem.
The log at the Servlet indicates that a response was sent, and ethereal
concures.
Originally the servlet only accepted https requests, even from the
web UI, and this is where I hit this problem first. I changed the
servlet so that it would accept http requests from localhost and
the problem diminished but did not go away.
The problem - I think - is in the org.apache.taglibs.io.PipiHelper
class, in the pipe routine. It currently reads:-
while (true) {
int size = input.read( buffer );
if ( size <= 0 ) {
return;
}
output.write( buffer, 0, size );
The problem is that size can be zero, especially for https
sessions when the stream is not at end of file. The only
real end of file is when size == -1.
The code should read:-
while (true) {
int size = input.read( buffer );
if ( size < 0 ) {
return;
}
else if( size == 0) {
Thread.sleep( 1);
}
else {
output.write( buffer, 0, size );
}
I am not sure whether the Thread sleep is necessary, but it does
give the scheduler a chance when the request is to a local source
in the same process (i.e. to a Tomcat servlet).
I am currently trying to build the IO taglibs with this fix to confirm
that it fixes the problem, but I am having difficulties largely to do with
constructing a build environment.
David
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