Re: serialization problem with tomcat with gcj

Re: serialization problem with tomcat with gcj

[Anthony Green]

Hi Christophe,

	I suspect a bug in gcj's serialization implementation.  Would it be
possible for you to try and reproduce the bug with a stand-alone program
which serializes/deserializes the same data?  This might be easier to
debug.  If you can reproduce this, then I suggest filing a bug with the
`gccbug' program.

Thanks,

AG



On Sat, 2002-06-08 at 12:15, Christophe Roux wrote:
> I try to port a java set of servlet from jdk1.2 / tomcat-2.3.2 to gcj 
> (gcc-3.1) with tomcat-3.2.3 from rhug.
> I met a problem with object deserialization as transmitting data from a first 
> servlet to a second one with a POST request.
> I build a scenario to reproduce my problem simply (tgz joined).
> I put flags in the second servlet to see where tomcat stops (I have no 
> stack-trace and the servlet never hands back).
> The servlet stops on the instruction which create an ObjectInputStream from 
> the servlet InputStream (before flag "POST2").
> I build gcc and rhug/jakarta-tomcat with UTF-8 encoding.
> But I build my program with ISO-8859-1 encoding for my program, as I use 
> french accents in my strings.
> If you need anything more to investigate, or if you think I should contact 
> someone in charge of gcj, tell me.
> Thanks a lot.
> Christophe Roux

Re: serialization problem with tomcat with gcj

[Anthony Green]

On Sat, 2002-06-08 at 12:15, Christophe Roux wrote:
> I try to port a java set of servlet from jdk1.2 / tomcat-2.3.2 to gcj 
> (gcc-3.1) with tomcat-3.2.3 from rhug.

Ok - on second thought, ignore my previous comment.  The compiler's
inliner has been found to produce bad code in some instances.  It will
likely be disabled in GCC 3.1.1.  

This may take a long time, but it's probably a smart idea...  Try
rebuilding everything (including libgcj) with -fno-inline.  The easiest
way to do this is to add -fno-inline to gcc/libjava/libgcj.spec.in
(right after -fkeep-inline-functions) and then rebuild the library,
rhug, and your servlets.  Let me know if this fixes things.

AG

Re: serialization problem with tomcat with gcj

[Anthony Green]

On Sun, 2002-06-09 at 13:27, Christophe Roux wrote:
> After a new compilation with -fno-inline there is no difference.

Thanks for taking the time to try this.

> About your first mail, I have tested first with a simple 
> ByteArrayOutputStream, in order to test the serialization before trying with 
> tomcat.
> I hope you can help me.

So do I!  I'm in the middle of a two week vacation with my family in
Hawaii -- so I don't expect I'll be able to do much until I return at
the end of the week.  My suggestion is to report this bug on
java@gcc.gnu.org in the meanwhile.

Thanks,

AG

Re: serialization problem with tomcat with gcj

[Anthony Green]

On Mon, 2002-06-17 at 09:18, Christophe Roux wrote:
> After a few investigation about my problem of serialization, I focused on 
> InputStream on the second class side (M2).
> Do you know why in rhug the class 
> org.apache.tomcat.service.connector.AJP12RequestAdapter is not given as 
> source code?

If I recall correctly, it's because it depends on something that gcj
doesn't support.  I could be wrong though.  Does your test require it?

> What does it mean for an open-source software?
> I hope you can answer.

Now that I'm back from my holiday I'm going to make time to look into
this tonight.

A couple of other things...

 - please copy rhug-rhats@sources.redhat.com, because other people may
have insight or advice
 - I'll be on irc.openprojects.net's #gcj channel when I do this, if you
want to chat

AG



AG