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RE: DESPERATION: QTSession.open() CRASHE

QTJava uses different methods to get the native window handle in 1.3.1 and 1.4.1 but as far as I know it determines the method to use dynamically based on the java.version property, not on the registry.

Running different JREs means you could be picking up different copies of QTJava.zip from the various lib/ext folders, perhaps you're using QTJava.zip that came with QT5 with QTJava.dll that came with QT6 or vice versa? Old versions of QTJava did NOT work with 1.4.1, though I thought they gave a runtime error rather than crash (but I could be wrong).

-Rolf

At 15:57 +0000 7/2/03, email@hidden wrote:
In our testing we found that QT6 does 'seem' to look at the registry at runtime! Please could apple confirm this.

Simply copying over our 1.4 jre (1.4.1_01 to be precise) and running our java app from there fails in the same way as described. We need to run the actual sun installer (a registry hack may achieve the same goal). This is not cool as if the users jre environment is 1.3 based then we are forcing them to go 1.4 (and if they then install 1.3 after our app ins installed) then we are stuffed.

My wild guess at the problem is that qt draws to the screen in a different way in jre 1.4 than in jre 1.3 and apple uses the registry to figure out what is current. If the registry and what you running is out of sync then you are stuffed.

We need to install (like most people) our product with the it's own jre.

Phil

TISL

-----Original Message-----
From: email@hidden [mailto:MIME :email@hidden]
Sent: 07 February 2003 09:59
To: email@hidden
Cc: email@hidden
Subject: Re: DESPERATION: QTSession.open() CRASHES without JRE !!





-------------------------------------------------------------------------- --
And how does that contradict what I said? :-) You said QTSession.open()
checked the registry, and I said it was only checked by the installer.

-Rolf

----- Original Message -----
From: "Rolf Howarth" <email@hidden>
To: <email@hidden>
Sent: Friday, February 07, 2003 1:39 AM
Subject: Re: DESPERATION: QTSession.open() CRASHES without JRE !!


I didn't think QTJava looked at the registry at all except when it's
being installed. Are you sure it's not a class path issue? If you do
a search on your hard drive for QTJava.zip how many copies do you
have and where are they? Running your own VM rather than the one
specified in the registry would mean you pick up a different lib/ext
folder and could well explain why one crashes and the other doesn't.

Trust me:

When you install quicktime and you choose to install qtjava, the
installer
checks for the presence of a suitable java runtime through this key:

[HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Runtime Environment]

If it doesn't find it, it doesn't even install qtjava.zip and its dlls
(that's really silly!! Read on).

The installer also looks for a suitable path where to install
qtjava.zip. If
it finds a "lib/ext" path (java2) it copies qtjava.zip there. In any
case it
copies qtjava.zip into the windows/system directory.
If you have java2 jre intalled, you can be sure that a qtjava
installation
will create a pair of qtjava.zip archives: one in "<jre>/lib/ext" and
one in
"windows/system".

There's a quick trick in order to "fool" the qt installer and get your
QTSession.open() back at work. When you install your app with your own
JVM
you must create the following keys:

REGEDIT4

[HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft]

[HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Runtime Environment]
"CurrentVersion"="MYJVM"

[HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Runtime Environment\MYJVM]
"JavaHome"=<INSERT HERE YOUR JRE_HOME PATH>

Cheers!

Mik
=========================================================================

===
ClassX Development Italy Via Francesca, 463 I-56030 Montecalvoli
(PI) <
Tel.(+39)-0587-749206 Fax.(+39)-0587-749206 WEB:
http://www.classx.it <
=========================================================================

===
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-- Rolf Howarth, Square Box Systems Ltd, Stratford-upon-Avon UK.
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--
Rolf Howarth, Square Box Systems Ltd, Stratford-upon-Avon UK.
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References: 
 >RE: DESPERATION: QTSession.open() CRASHE (From: email@hidden)



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