Groups > comp.lang.java.programmer > #14505

Re: JavaT Runtime Environment Version Selection

From	Lew <noone@lewscanon.com>
Newsgroups	comp.lang.java.programmer
Subject	Re: JavaT Runtime Environment Version Selection
Date	2012-05-14 07:26 -0700
Organization	albasani.net
Message-ID	<jor4li$5n7$1@news.albasani.net> (permalink)
References	<joqmn9$aes$1@speranza.aioe.org>

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Richard Maher wrote:
> On May 10, 11:36 am, Richard Maher<mahe...@googlemail.com>  wrote:

Why start a new thread? Just continue in the original one.

>> In my Applet's<object>  tag I specify the "java_sersion" parameter as
>> follows: -
>>
>> <param name="java_version"       value="1.7+">
>>
>> I'd expected this clause to trigger the Java plugin (as long as after
>> 1.6_10) to throw/report some sort of excption if there was now Java
>> version available>= 1.7. Unfortunately, the Java plugin (1.6_31 in
>> this case) seems very happy just to attempt to run the Applet on that
>> version and ignore the later version requirement.
>>
>> Is this to be expected?
>>
>> Have I specified the parameter incorrectly?

No, but you have failed to read the documentation. It's working as it's 
supposed to.

>> I thought it might just have been crappy Safari on OS/X but it also
>> limps-on or completely ignores this parameter on FireFox and Windows.
>>
>> I would like the Applet load to fail if there is no 1.7+ version; how
>> can I achieve this?

Use JNLP.

As already advised. Why you not follow advice?

> On May 11, 10:27 pm, Richard Maher<mahe...@googlemail.com>  wrote:
>> Honestly, here's a very simple applet: -

You're recapitulating the entire thread - well, your part of it. You should 
have stayed in context.

>> <HTML>
>> <HEAD>
>> <TITLE>  A Simple Program</TITLE>
>> </HEAD>
>> <BODY>
>>
>> Here is the output of my program:
>> blah blah blah
>>
>> Can *anyone* show me *any version* or Java +/- browser wher the
>> "java_version" applet parameter does *anything* other than take up
>> space? APPLET, OBJECT, or EMBED tags.

It does exactly what it's documented to do. Your problem?

>> What is supposed to hapen when I ask/demand 7.0 and 7.0 does not
>> exists???

See the relevant quote below. It's from the documentation.

>> Is larry pre-occupied on courtroom battles to concentrate on something
>> that should be so simple?

Still a stupid question, new thread notwithstanding.

> Once again, for those following at home, I did some more tests and realized
> that if you have multiple JREs available then you can choose a specific
> lower version that is on your system (For example if you have 1.7 and 1.6
> available and some applet is already running in 1.7 then yours can elect to
> run in a 1.6 JVM and it will be duly created) The problem, as I see it, is
> that if you elect/mandate a JRE version that is not available then the new
> plugin will just opt for limp-home mode and gives you the latest version
> available, push it up the flag-pole and see if anyone salutes, in a
> suck-it-and-see strategy :-(
>
> Details can be found here: -
> http://www.oracle.com/technetwork/java/javase/index-141751.html#BEHAVIOR
>
> I am aghast at this and implore those in a position to do something (the
> http://forums.java.net/jive/forum.jspa?forumID=77 link doesn't seem very
> active) to introduce a "just do what you're bloody well told" flag!

If the tag did as you suggest it would violate the documented behavior:
"When considering a request to launch an applet on a particular family or any 
later family, the latest available JRE will be used to launch the applet."

So the thing is working the way it's supposed to.

RTFM.

-- 
Lew
Honi soit qui mal y pense.
http://upload.wikimedia.org/wikipedia/commons/c/cf/Friz.jpg

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JavaT Runtime Environment Version Selection "Richard Maher" <maher_rj@hotspamnotmail.com> - 2012-05-14 18:27 +0800
  Re: JavaT Runtime Environment Version Selection Lew <noone@lewscanon.com> - 2012-05-14 07:26 -0700

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