JavaT Runtime Environment Version Selection

05-14-2012

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

On May 11, 10:27 pm, Richard Maher <mahe...@googlemail.com> wrote:
> Honestly, here's a very simple applet: -
>
> <HTML>
> <HEAD>
> <TITLE> A Simple Program </TITLE>
> </HEAD>
> <BODY>
>
> Here is the output of my program:
> <APPLET CODE="HelloWorld.class" WIDTH=150 HEIGHT=25>
> <param name="java_version" value="1.4*">
> </APPLET>
> </BODY>
> </HTML>
>
> import java.awt.Graphics;
> public class HelloWorld extends java.applet.Applet {
>
> public void init() {
> resize(150,25);
> }
> public void paint(Graphics g) {
> g.drawString("Hello world!", 50, 25);
> }
>
> }
>
> 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.
>
> What is supposed to hapen when I ask/demand 7.0 and 7.0 does not
> exists???
>
> Is larry pre-occupied on courtroom battles to concentrate on something
> that should be so simple?
>
> Cheers Richard Maher

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/ja....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!

Really, what is the point of the "+" and "*" when "+" is what everyone gets?

Cheers Richard Maher

05-14-2012

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/ja....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/wikipedi.../c/cf/Friz.jpg

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