491671 - Firefox hangs for a few minutes on java applets

Status: RESOLVED DUPLICATE of bug 501173

(Firefox :: General, defect)

Description

[m]

User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-GB; rv:1.9.0.10) Gecko/2009042708 Fedora/3.0.10-1.fc10 Firefox/3.0.10
Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-GB; rv:1.9.0.10) Gecko/2009042708 Fedora/3.0.10-1.fc10 Firefox/3.0.10

whenever I want to do anything on the web what includes java applets, I feel a trouble coming. In 8 out 10 cases firefox will hang indefinitely while trying to load a java applet. sometimes it eventually loads a java applet and lets me use it, but in most cases I am using firefox within virtual machine, because it just works.

Reproducible: Always

Steps to Reproduce:
1. Open new firefox window
2. go to facebook.com, create a new album
3. try to add some pictures (via java applet)
Actual Results:  
firefox hangs for 2-3 minutes or indefinitely, firefox uses around 50% cpu while java_vm uses less than 5%

Expected Results:  
firefox loads a plugin within a few seconds without hangs or crashes.

I've got a Windows XP Virtual Machine where I have latest firefox and java installed - in this environment bulk image upload applet loads within 2-3 seconds, so I guess something is wrong with Firefox for linux.

I've mention facebook as an example, but it actually applies to all java applets - ie. at work I need to develop a site which has java applet - so I have to use firefox in wirtual machine as native linux firefox is not usable at all.

Comment 1

[m]

Attachment: 8 of 10 times I see this when I want to load any java applet

Comment 2

[m]

Attachment: CPU usage while loading a java applet

Comment 3

[Matthias Versen [:Matti]]

Why do you guess that something is wrong with Firefox on linux and not with Java on Linux ?
You missed to include the used Java version.

Comment 4

[m]

(In reply to comment #3)
> Why do you guess that something is wrong with Firefox on linux and not with
> Java on Linux ?

sometimes after a few minutes Firefox asks whether to stop or allow to continue some chrome/Ns*.js script - which is a part of Firefox - that was easy to get with Minefield, but at the moment (latest version from trunk) crashes when I am trying to open a webpage with java applet:

[marek@d620 firefox]$ ./firefox --no-remote -ProfileManager
INTERNAL ERROR on Browser End: Could not get the JVM manager
System error?:: Resource temporarily unavailable
./run-mozilla.sh: line 131:  4478 Segmentation fault      "$prog" ${1+"$@"}

> You missed to include the used Java version.

[marek@d620 Desktop]$ java -version
java version "1.6.0_11"
Java(TM) SE Runtime Environment (build 1.6.0_11-b03)
Java HotSpot(TM) Server VM (build 11.0-b16, mixed mode)
[marek@d620 Desktop]$

Comment 5

[Matthias Versen [:Matti]]

>INTERNAL ERROR on Browser End: Could not get the JVM manager


This is an error message from the java plugin itself. I guess that the plugin can not find (?) the JVM. This can happen if you copy the plugin instead of symlinking it.

>ometimes after a few minutes Firefox asks whether to stop or allow to continue
>some chrome/Ns*.js script

You should be able to copy the error message from the dialog. It would be nice to get the full error message.

Comment 6

[Kevin Brosnan]

Needed response to comment 5. Closing as incomplete. If you can still produce this bug after symlinking the java plugin please comment and the bug can be reopened.

Comment 7

[m]

(In reply to comment #6)
> Needed response to comment 5. Closing as incomplete. If you can still produce
> this bug after symlinking the java plugin please comment and the bug can be
> reopened.

Unfortunatelly I am unable to get this message again, but problem is still not solved. Just fired up a Firefox 3.5 beta 4 (shipped with fedora 11), latest Java Sun plugin installed (1.6.0.13) and ... still the same problem - see attached image, how my browser looks like when I try to upload images.

I must say, that that does not happen on all websites - sometimes I visit chateria.interia.pl web-chat written in Java and this one has never made browser frozen, see: http://czateria.interia.pl/czat,room,126,Pub

the difference is working one uses “old” java, the Facebook one uses fancy gnome widgets which look nice (when I am lucky enough to get java working), but in most cases they make my browser crash.

Comment 8

[m]

Attachment: just tested, on facebook.com

of course CPU went up to 50% (one core was busy, the other one not), firefox caused that heavy usage, while java_vm stayed calm (<2%).

Comment 9

[m]

As I wrote already - I cannot reproduce the error message - but Java still doesn't work on facebook.com for me. Sometimes when I am lucky enough after 2-3 mintues, it suddenly calms and works like nothing happened, but if I come back to the page with a java, it will hung again and this time I have to kill browser, as it won't unlock.

is there any way I could see, which part of firefox gets busy while I am getting this hungs? I am happy to help, but I don't know how to help. At the moment any time I want to add photos to facebook, I need to fire up VirtualBox and do it from Windows.

Comment 10

[m]

Attachment: Browser error when loading java plugin

finally I've managed to re-create the javascript error, I've spotted it by accident on flightview.com website, I have visited that website before a few times and today is a first time when I got this message - usually firefox freezes for a few minutes and is not responding or responds after a few minutes.

1. typed http://www.flightview.com/TravelTools/default.asp
2. selected flight BA 95
3. clicked 'Lunch live', then 'Go live' in popup window
4. after two minutes got this error
5. after clicking 'Continue' after around 10-15 seconds firefox become responsible again.

Comment 11

[Tyler Downer [He/Him]]

Does this happenw ith Firefox 3.5 final or later in a new Firefox profile and Java 6 update 14

Comment 12

[m]

I must say, just found why java is not loading correctly - I am using just three extensions - fire bug, web developer and adblock plus - the last one is causing java to behave abnormally. when I disable adblock, I can see nice “java loading” animation and plugin just works.

Though I need adblock to block all this flashy stuff which I don't need as it slows down firefox a lot and drives me crazy... :(

closing as not-a-bug.