Various applets don't load in browser but work in appletviewer

[Braden Obrzut]

I'm having trouble viewing certain Java applets from Firefox. The applets work fine if the url is fed into appletviewer (provided by openjdk-6-jdk), but running them in the browser gives various errors related to class loading. Examples of such errors would be either a class cast exception or class loader magic number error.

Problematic applets:
http://games.yahoo.com/console/tx
https://www.thirdfederal.com/Calculators/fixedmortgagecalculator.aspx

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: icedtea6-plugin 6b21.1.3-1ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 1.23-0ubuntu3
Architecture: amd64
Date: Sat Oct 29 14:03:20 2011
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: icedtea-web
UpgradeStatus: Upgraded to oneiric on 2011-10-15 (14 days ago)

[Matthias Klose (doko)]

forwarded from https://launchpad.net/883598, reproduced with 1.2

"I'm having trouble viewing certain Java applets from Firefox. The applets work fine if the url is fed into appletviewer (provided by openjdk-6-jdk), but running them in the browser gives various errors related to class loading. Examples of such errors would be either a class cast exception or class loader magic number error.

Problematic applets:
http://games.yahoo.com/console/tx
https://www.thirdfederal.com/Calculators/fixedmortgagecalculator.aspx
"

[Matthias Klose (doko)]

seen as well with 1.2

[Adomurad (adomurad)]

I have looked into the issue and confirmed it as a general issue.
I have labelled the bug with what, as far as I can tell, causes the issue.

Will look into a solution, thanks.

[Mercurial (mercurial)]

details: http://icedtea.classpath.org//hg/icedtea-web?cmd=changeset;node=e7d3c75b2656
author: Adam Domurad <email address hidden>
date: Tue Aug 28 14:32:12 2012 -0400

 Reproducer for PR920, linkage error sometimes occurs

[Mercurial (mercurial)]

details: http://icedtea.classpath.org//hg/icedtea-web?cmd=changeset;node=855087771e7e
author: Adam Domurad <email address hidden>
date: Tue Aug 28 14:36:06 2012 -0400

 Fix for PR920: Classes attempted to load twice when class extends from outside jar

[Adomurad (adomurad)]

Fix in HEAD, closing as resolved.

If you wouldn't mind, I would appreciate validation that the latest release at the hg repository http://icedtea.classpath.org/hg/icedtea-web is working as expected.

Instructions can be found at:
http://icedtea.classpath.org/wiki/IcedTea-Web#Getting_IcedTea-Web

[Braden Obrzut (blzut3)]

I quickly tried to build the latest plugin and I'm getting "configure: error: "A JRE home directory could not be found."" Is there a specific configure command I should run to have it overwrite the plugin provided by Ubuntu?