sun jdk vs java-1.6.0-openjdk

Deepak Bhole dbhole at
Tue Jul 27 14:54:13 UTC 2010

* Joerg Bergmann <email at> [2010-07-26 06:34]:
>   Am 26.07.2010 11:41, schrieb Andrew Haley:
> > On 07/25/2010 05:43 AM, Bob Hartung wrote:
> >
> >>     I have loaded Fedora13 without a hitch and am impressed by the
> >> improvements!
> >>
> >>     However, I am just now beginning Java programming and I am wondering
> >> if there is any substantial difference between java-1.6.0-openjdk and
> >> the sun jdk.
> > They are based on the same source code and both conform to the same
> > language specification.  For almost all purposes you won't see any
> > difference.
> >
> I cannot confirm that. In real live, with Java apps not developed
> for OpenJava, 50% of the "large" applets as developed using Sun
> JDK fail with OpenJava. A simple example: The german tax office
> has an online tax system called "Elster". There is an applet
> for secure communication with Elster using public/private
> keys, this applet fails using OpenJava. Another example is related
> to javax.imageio, output of images to files simply does not work
> in OpenJava. Installation of Sun Java is one of the first modifications
> I do to Fedora. Unfortunately, on every update of OpenJava, OpenJava
> would become the default Java again.

As Andrew mentioned in another reply, the plugin and webstart in
Fedora's OpenJDK rpm are independent of upstream OpenJDK itself.
Upstream OpenJDK distributed by Oracle does not contain plugin and
WebStart implementations, and we add them later via the IcedTea project

That said, I don't think '50% working' is correct for the plugin 
in Fedora. It works far better than that. Additionally, we follow up
on bugs and try to fix whatever we can. However the proprietary nature
of many applets makes it quite challenging -- impossible in some cases
without decompiling their code, which is something we cannot do.

What is the bug# for the Elster system not working?



> M$ has given the freedom of selecting between IE, Firefox, Opera etc.
> It would be a good act of freedom to give the fedora user the choice
> between OpenJava and SunJava. At now, half the Fedora System depends
> on OpenJava (same story as of Windows depends on IE), for that reason
> I cannot deselect OpenJava.
> Joerg
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