Re: Java Runtime Environment

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Java Runtime Environment
\ nearlydeparted (7 Oct 2007)
. \ Melchert Fruitema (7 Oct 2007)
. \ , , Upsdell (7 Oct 2007)
. . \ Alex K. (8 Oct 2007)

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Subject:	Re: Java Runtime Environment
Group:	Mozilla-support-firefox
From:	Alex K.
Date:	8 Oct 2007

C A Upsdell > wrote:
> nearlydeparted wrote:
>> In the past month or so, I've had a few web sites I've visited
>> that wouldn't come up until I installed the JRE.
>> But ... I've had that installed all along.
>> It's unnerving to have some random web site offer me a plugin
>> for something I already have --
>> I'm strongly inclined to believe that it's a scam, or much, much worse.
>> Can anyone explain what's happened?
>
> There are many versions of Java, and newer versions may not be entirely
> compatible with older versions. I have 3 versions myself, just for this
> reason. Maybe they need a specific older version?
>

What I recall, from the last time I looked into a similar issue, was
that the page author was *too* specific, when specifying the version number.

If you look at the Java listings in about:config, you will see multiple
.dlls, covering the different versions. I'll just show one, as an example:

Java(TM) Platform SE 6 U2 [I see that I need to update this one, U3 is
now available.]

File name: npjava13.dll
Java Plug-in 1.6.0_02 for Netscape Navigator (DLL Helper)

MIME Type
application/x-java-applet;version=1.3.1
application/x-java-bean;version=1.3.1
application/x-java-applet;version=1.4
application/x-java-bean;version=1.4
application/x-java-applet;version=1.4.1
application/x-java-bean;version=1.4.1

So this plugin, npjava13.dll, even though it is part of the Java Plug-in
1.6.0_02 package, is the one that would be called when the version
specified is 1.3.1, 1.4, or 1.4.1. This will work as long as the author
specifies these version numbers.

But, suppose that the author specifies 1.4.1_03? In that case you would
be prompted to download it, because it would be looking for that
*specific version only*, even though the 1.4.1 version that is installed
should have all the updates to the 1.4.1 series included.

Here are the other .dlls and the associated versions:

File name: npjava14.dll
Versions: 1.4.2, 1.5, & 1.6

File name: npjava32.dll
Versions: 1.3, 1.2.2, & 1.2.1

File name: npjava11.dll
Versions: 1.1.1 & 1.1

File name: npjava12.dll
Versions: 1.2, 1.1.3, & 1.1.2

File name: npjpi160_02.dll
Version: 1.6.0_02

As Melchert said, if the OP posts a link, we could verify this.

--
Alex K.
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