Re: FF3.6 Stack output from Too Much Recursion

"Richard Maher" <>
Tue, 2 Mar 2010 21:45:40 +0800
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 managed to


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

Jorge was good enough to try that (see below for details) but unfortunately
when the JAVA applet is removed from the equation it all seems to work. It
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 exhibit


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" call


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

Don't know how to answer that, because I can't look into your applet and
browsers don't have an EDT (well, maybe HotJava does). I don't know what
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(); resulting
in "x" being executed inline and that might possibly explain the recursion
that I am yet to see! Ridiculous perhaps but I'm running short of options.

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 any
other functions queued with setTimeout have been called, if necessary).

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 me
what FF3 considers a recursive check/condition (especially given the "stack"
property in the Exception that I included earlier) Once again the code *with
Applet* works fine with only one EmpPicker() selected/instantiated but when
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 speak.

Why would multiple concurrent (Jorge's code can not induce the 1.5sec delay
my server can) timers flag a false recursion flag/exception when a sigle one
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****

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