FireFoc support forums (Re: FF3.6 Stack output from Too Much Recursion)

"Richard Maher" <>
Tue, 9 Mar 2010 07:30:00 +0800
Ok, can anyone recommend a FireFox-specific (or Mozilla?) support and/or
user forum? Looks active. Any better?

Cheers Richard Maher

"Richard Maher" <> wrote in message

"Richard Maher" <> wrote in message

Hi Stefan,

"Stefan Weiss" <> wrote in message

On 02/03/10 00:17, Richard Maher wrote:

Sorry for labouring on this but I upgraded to FireFox 3.6 and




a bit more useful output that might ring a bell with somebody. The


is a dump of the exception properties that was thrown from the code


(Search for "4" to locate the source): -

I don't have FF 3.6 available for testing, but I've experienced this
error sporadically in FF 3.0. In my case, I had suspected Firebug (I
think we talked about this before, not sure), but it could easily have
been something else. By the time I reactivated Firebug, it had been
updated, and the problem had disappeared: correlation, but not
necessarily causation.

The very first thing I would try: disable *all* Firefox add-ons, and I
mean really disable and restart.

Done, but still no joy I'm afraid :-(

A few weeks ago, I spent most of an
afternoon tracking down a weird JavaScript error ("e is not defined"),
and when I finally found the source, it turned out to be a typo in the
NoScript add-on. If you can eliminate the possibility of an error
outside your own code, that would help narrow it down. If you could
reproduce the error with Java disabled, that would be even better, but


don't know if that's possible in your application.

Jorge was good enough to try that (see below for details) but


when the JAVA applet is removed from the equation it all seems to work.


looks like I'll have to try and come up with a scaled-down Applet

Any ideas what's happening? FF2 is fine, IE and Chrome do not



problem :-(

1) Is "canvas" now a dodgy reserved word?


OK, with HTML5 support appearing I thought I'd clutch at that straw :-)

2) Is setTimeout with zero millises some sort of optimized "inline"



does not place a *non-recursive* event on the Event Dispatching


Don't know how to answer that, because I can't look into your applet


browsers don't have an EDT (well, maybe HotJava does). I don't know


you mean by "optimized inline call", there's no such thing in

I was dreaming that a setTimeout(x.0); was being optimized to x();


in "x" being executed inline and that might possibly explain the


that I am yet to see! Ridiculous perhaps but I'm running short of


Calling window.setTimeout with 0 as the second argument
should result in the function being called "at the earliest
opportunity", after the main (=only) JS thread has become idle (and


other functions queued with setTimeout have been called, if


Yes. So: -

function x(){
  setTimeout(x,0); //Along the lines of what I'm doing

Does not induce any bloody form of recursion unlike: -

function x(){
  x(); // This will crap out at 3000 (reported stack depth) on FF3.6

Which is what I'm *not* doing.

I guess I just wish someone who could read the Mozilla code could tell


what FF3 considers a recursive check/condition (especially given the


property in the Exception that I included earlier) Once again the code


Applet* works fine with only one EmpPicker() selected/instantiated but


another (up to 5) is introduced the "recursion" is trapped at around 153
iterations. The code is also happily chugging away on Chrome as we


Why would multiple concurrent (Jorge's code can not induce the 1.5sec


my server can) timers flag a false recursion flag/exception when a sigle


does not? And why only after 153 successful iterations?


Thanks for your continued interest and advice!

Cheers Richard Maher

Here's Jorge's "working" code (replacing the Applet bits in
Tier3Client.js): -

"Jorge" <> wrote in message

****FROM HERE****
On Jan 30, 11:01 am, "Richard Maher" <>

Removing the applet and the back-and-forth between Java-JS the
resulting java-less version seems to run fine:

<script type="text/javascript">
  function Tier3Client () {
    (this.chan= {}).rendezvous= function () {
      console.log("this.chan.rendezvous(), "+ (+new Date()));

    this.chan.send= function (msgCandidate, msgBody, async) {
      var r=


      if (async) {
        setTimeout(function () {
          msgCandidate.dispatcher(r, 0, 0);
        }, (2e3*Math.random())|0);
      } else {
        msgCandidate.dispatcher(r, 0, 0);

    this.chan.appendConsoleMsg= function (p) {
      console.log("appendConsoleMsg: "+ p);

  (Tier3Client.prototype = {}).send= function (msgBody, callback,
async) {
    var chan = this.chan;
    var callbackArgs = [];
    var i = 0;
    var msgCandidate = {
      dispatcher : function (responseMsg, msgSlotId, msgSeqNum) {
        callbackArgs[0] = responseMsg;
        callback.apply(this, callbackArgs);
      rendezvous : function () {
        console.log("msgCandidate.rendezvous(), "+ (+new Date()));
        return chan.rendezvous();
    for (i=3; i<arguments.length; i++) {
      callbackArgs[i - 2] = arguments[i];
    return chan.send(msgCandidate, msgBody, async);

  Tier3Client.prototype.appendConsoleMsg= function (msg) {
    console.log("Tier3Client.prototype.appendConsoleMsg(), "+ (+new

****TO HERE****

I will put in the not insubstantial effort to come with (hopefully) a


reproducer, but in the mean time here's a couple of bits of information


might lead someone to explain to me why FireFox 3 is giving me "too much

The architected JAVA and Javascript behaviour is as follows: -

Page Load:-
1) Javascript invokes an Applet Method (Creates a Tier3Client instance)
2) The Applet init() method does many things including create a Socket and


Thread that reads from the socket

EmpPicker() Javascript Object (1 to 5 created on demand by the user): -
1) setTimeout(sendRequest,0)
2) sendRequest calls an Applet method specifying "callback" and then


in Applet
3) Thread reading socket calls the Javascript callback routine
4) When ready, the Javascript "rendezvous()" method calls back into the
Applet and "notify"s the original sending thread that it can exit back to
5) The callback routine then setTimeout(fadeIt,fadeInterval)
6) If we're still fading schedule another fade else schedule another READ
5b) The sendRequest is ready to recieve control back from the Applet but


new JAVA plugin waits until the callback has returned to JAVA thus
preserving "conceptually, the single-threaded nature of today's modern

For more JAVA/Javascript threading behaviour info, please see: -

C'mon guys/gals, I bet you have the answer and can have a whole weeks


supply of vicodin if you can just come up with a semi-resonable diagnosis!
(Not me dick-head, the problem :-)

a) FireFox II is perfectly fine with it!
b) FireFox3 doesn't have any issues until more than one instance of
EmpPicker() is active.
c) Chrome have 5 EmpPickers going simultaneously for 20,000 iteractions


no signes of distress
d) 148 is no where near 3000

So is something else using up the Stack space? It certainly doesn't report
as being corrupt.
Has FF3 introduced some too-clever-by-half stack monitor/walker thread to
proactively pounce on errant Javascript
Anyone seen a half-relevant release note?

Go on, take a shot, make a name for yourself, and most importantly save a
patient :-)

Cheers Richard Maher

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