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From: Rich Winkel <rich@pencil.math.missouri.edu>
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Subject: Re: SIGSEGV under FBSD 4.1-release with compat 3.x
In-Reply-To: <200009302120.PAA09314@nomad.yogotech.com> "from Nate Williams at
Sep 30, 2000 03:20:53 pm"
To: Nate Williams <nate@yogotech.com>
Date: Tue, 3 Oct 2000 12:23:14 -0500 (CDT)
Cc: freebsd-java@freebsd.org
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According to Nate Williams:
> > Hi, I'm having problems with jdk-1.1.8 under 4.1-R with the compat
> > 3.x libraries installed. Whatever I try, I get:
> >
> > SIGSEGV 11* segmentation violation
>
> This is almost always because the compat libraries aren't really
> installed, but are symlinks to the newer libraries. Are you
> *absolutely* sure the libraries are correctly installed?
Thanks for the reply!
I ran "find . -type l -print" under /usr/lib/compat and found only two:
./aout/libcrypt.so.2.0
./aout/libtermlib.so.2.1
Following is the /etc/make.conf used to build the system:
CFLAGS= -O -pipe
COPTFLAGS= -O -pipe
COMPAT22= yes
COMPAT3X= yes
KRB5_HOME= /usr/bin
MODULES_WITH_WORLD= true
NOPROFILE= true
NO_MODULES= true
NO_OPENSSH= true
PRINTERDEVICE= ps
USA_RESIDENT= NO
Just to be sure I ran /stand/sysinstall and
installed the compat3.x libraries from the 4.1 CD, and rebooted.
Still the same problem.
Is anyone else running java under 4.1R?
Thanks,
Rich
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To: Rich Winkel <rich@pencil.math.missouri.edu>
Cc: Nate Williams <nate@yogotech.com>, freebsd-java@freebsd.org
Subject: Re: SIGSEGV under FBSD 4.1-release with compat 3.x
In-Reply-To: <200010031723.MAA23312@pencil.math.missouri.edu>
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<200010031723.MAA23312@pencil.math.missouri.edu>
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> > > Hi, I'm having problems with jdk-1.1.8 under 4.1-R with the compat
> > > 3.x libraries installed. Whatever I try, I get:
> > >
> > > SIGSEGV 11* segmentation violation
> >
> > This is almost always because the compat libraries aren't really
> > installed, but are symlinks to the newer libraries. Are you
> > *absolutely* sure the libraries are correctly installed?
>
> Thanks for the reply!
>
> I ran "find . -type l -print" under /usr/lib/compat and found only two:
> ./aout/libcrypt.so.2.0
> ./aout/libtermlib.so.2.1
These aren't the 3.X compatability libraries.
> Following is the /etc/make.conf used to build the system:
> CFLAGS= -O -pipe
> COPTFLAGS= -O -pipe
> COMPAT22= yes
> COMPAT3X= yes
I don't know how the compatability libraries are installed via
buildworld. I just install them via the package off the net.
> Just to be sure I ran /stand/sysinstall and
> installed the compat3.x libraries from the 4.1 CD, and rebooted.
> Still the same problem.
Weird.
> Is anyone else running java under 4.1R?
I get alot of email saying that, but I'll let others pipe up.
Nate
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From owner-freebsd-java Tue Oct 3 11:22:40 2000
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To: Rich Winkel <rich@pencil.math.missouri.edu>
Cc: freebsd-java@FreeBSD.ORG
Subject: Re: SIGSEGV under FBSD 4.1-release with compat 3.x
In-Reply-To: <200010031723.MAA23312@pencil.math.missouri.edu>
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>>>>> "Rich" == Rich Winkel <rich@pencil.math.missouri.edu> writes:
Rich> According to Nate Williams:
>> > Hi, I'm having problems with jdk-1.1.8 under 4.1-R with the compat
>> > 3.x libraries installed. Whatever I try, I get:
>> >
>> > SIGSEGV 11* segmentation violation
>>
>> This is almost always because the compat libraries aren't really
>> installed, but are symlinks to the newer libraries. Are you
>> *absolutely* sure the libraries are correctly installed?
Rich> Is anyone else running java under 4.1R?
Runs ok for me on 4.0-R install upgraded to 4.1-S as of Sep 14.
Martin
--
Martin Hopkins | martin.hopkins@insignia.com
Insignia Solutions Plc, | martin@uk.freebsd.org
The Mercury Centre, Wycombe Lane | Tel: (+44) 1628 539537
Wooburn Green, Bucks, HP10 0HH, UK. | Fax: (+44) 1628 539501
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From owner-freebsd-java Tue Oct 3 13: 2:13 2000
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From: Greg Lewis <glewis@trc.adelaide.edu.au>
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Subject: Re: SIGSEGV under FBSD 4.1-release with compat 3.x
In-Reply-To: <200010031723.MAA23312@pencil.math.missouri.edu> from Rich Winkel
at "Oct 3, 2000 12:23:14 pm"
To: Rich Winkel <rich@pencil.math.missouri.edu>
Date: Wed, 4 Oct 2000 05:31:46 +0930 (CST)
Cc: freebsd-java@freebsd.org
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Rich Winkel wrote:
> According to Nate Williams:
> > > Hi, I'm having problems with jdk-1.1.8 under 4.1-R with the compat
> > > 3.x libraries installed. Whatever I try, I get:
> > >
> > > SIGSEGV 11* segmentation violation
> >
> > This is almost always because the compat libraries aren't really
> > installed, but are symlinks to the newer libraries. Are you
> > *absolutely* sure the libraries are correctly installed?
>
> Thanks for the reply!
>
> I ran "find . -type l -print" under /usr/lib/compat and found only two:
> ./aout/libcrypt.so.2.0
> ./aout/libtermlib.so.2.1
Ok, well what you are looking for is /usr/lib/compat/libc.so.3. Here is the
information from my 4.1-R system with the 3.x compat libraries installed:
> ls -l /usr/lib/compat/libc.so.3
-r--r--r-- 1 root wheel 520040 Jul 28 22:34 /usr/lib/compat/libc.so.3
> md5 /usr/lib/compat/libc.so.3
MD5 (/usr/lib/compat/libc.so.3) = a1fb1ba200942ff34a90e9cbb4c84c80
If those pieces of information are different to that on your system then
that may be the cause of your problem. JDK 1.1.8 does work ok for me.
> Just to be sure I ran /stand/sysinstall and
> installed the compat3.x libraries from the 4.1 CD, and rebooted.
> Still the same problem.
That is odd, I installed off the cdrom too.
> Is anyone else running java under 4.1R?
Yep, multiple versions even :).
- Greg
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From owner-freebsd-java Tue Oct 3 13:34:30 2000
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Date: Tue, 03 Oct 2000 16:34:02 -0400
From: "Newman, Alexander" <AJ@AJNewman.net>
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Subject: Sun Keynote at JavaCon2000
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FYI, George Paolini (VP Sun) gave a keynote at JavaCon2000, and notable
on the slides was an official port of JDK1.3 to FreeBSD/BSDi.
Regards (and thanks for all the excellent work)
Alexander
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From owner-freebsd-java Tue Oct 3 15: 9:55 2000
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From: "Joe Shevland" <shevlandj@kpi.com.au>
To: <freebsd-java@FreeBSD.ORG>
Subject: RE: Sun Keynote at JavaCon2000
Date: Wed, 4 Oct 2000 09:16:36 +1100
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Thats fantastic news,
Cheers,
Joe
> -----Original Message-----
> From: owner-freebsd-java@FreeBSD.ORG
> [mailto:owner-freebsd-java@FreeBSD.ORG]On Behalf Of Newman, Alexander
> Sent: Wednesday, October 04, 2000 7:34 AM
> To: freebsd-java@FreeBSD.ORG
> Subject: Sun Keynote at JavaCon2000
>=20
>=20
> FYI, George Paolini (VP Sun) gave a keynote at JavaCon2000, and =
notable
> on the slides was an official port of JDK1.3 to FreeBSD/BSDi.
>=20
> Regards (and thanks for all the excellent work)
>=20
> Alexander
>=20
>=20
>=20
> To Unsubscribe: send mail to majordomo@FreeBSD.org
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>=20
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From owner-freebsd-java Tue Oct 3 15:30:54 2000
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Date: Tue, 03 Oct 2000 16:13:27 -0600
To: freebsd-java@FreeBSD.ORG
From: "Mark J. Sommer" <msommer@argotsoft.com>
Subject: Re: Sun Keynote at JavaCon2000
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Oh man, is that ever good news. But we'll wait and see.
At 04:34 PM 10/3/00 -0400, Newman, Alexander wrote:
>FYI, George Paolini (VP Sun) gave a keynote at JavaCon2000, and notable
>on the slides was an official port of JDK1.3 to FreeBSD/BSDi.
>
>Regards (and thanks for all the excellent work)
>
>Alexander
>
>
>
>To Unsubscribe: send mail to majordomo@FreeBSD.org
>with "unsubscribe freebsd-java" in the body of the message
>
>
~Mark
--------------------------------------------------------------------------------
Mark J. Sommer ARGOT Software Corporation,
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From owner-freebsd-java Tue Oct 3 15:57: 3 2000
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From: "Renaud Waldura" <renaud@waldura.com>
To: <freebsd-java@freebsd.org>
References: <3.0.3.32.20001003161327.00a63820@mail>
Subject: Re: Sun Keynote at JavaCon2000
Date: Tue, 3 Oct 2000 15:56:56 -0700
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This is *very* exciting news.
I had to let go of a lot of my FreeBSD installs only because I found it
impossible to justify running the Linux JDK in "emulation mode" on FreeBSD
when it could be running so well (so fast) in native mode on a Linux box
with an equivalent price tag.
Any documents related to this port on the Sun site?
--Renaud
----- Original Message -----
From: Mark J. Sommer <msommer@argotsoft.com>
To: <freebsd-java@FreeBSD.ORG>
Sent: Tuesday, October 03, 2000 3:13 PM
Subject: Re: Sun Keynote at JavaCon2000
> Oh man, is that ever good news. But we'll wait and see.
>
> At 04:34 PM 10/3/00 -0400, Newman, Alexander wrote:
> >FYI, George Paolini (VP Sun) gave a keynote at JavaCon2000, and notable
> >on the slides was an official port of JDK1.3 to FreeBSD/BSDi.
> >
> >Regards (and thanks for all the excellent work)
> >
> >Alexander
> >
> >
> >
> >To Unsubscribe: send mail to majordomo@FreeBSD.org
> >with "unsubscribe freebsd-java" in the body of the message
> >
> >
>
> ~Mark
> --------------------------------------------------------------------------
------
> Mark J. Sommer ARGOT Software Corporation,
> P.O. Box 92020, Albuquerque, New Mexico 87199-2020
> FAX: 505-771-0274 PHONE: 505-867-6750 E-MAIL:
msommer@argotsoft.com
>
>
>
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> with "unsubscribe freebsd-java" in the body of the message
>
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From owner-freebsd-java Tue Oct 3 16: 4:21 2000
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Date: Tue, 3 Oct 2000 19:03:52 -0400
To: "Newman, Alexander" <AJ@AJNewman.net>, freebsd-java@FreeBSD.ORG
From: Garance A Drosihn <drosih@rpi.edu>
Subject: Re: Sun Keynote at JavaCon2000
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At 4:34 PM -0400 10/3/00, Newman, Alexander wrote:
>FYI, George Paolini (VP Sun) gave a keynote at JavaCon2000,
>and notable on the slides was an official port of JDK1.3 to
>FreeBSD/BSDi.
>
>Regards (and thanks for all the excellent work)
Was there anything said about an expected timetable?
---
Garance Alistair Drosehn = gad@eclipse.acs.rpi.edu
Senior Systems Programmer or drosih@rpi.edu
Rensselaer Polytechnic Institute
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> FYI, George Paolini (VP Sun) gave a keynote at JavaCon2000, and notable
> on the slides was an official port of JDK1.3 to FreeBSD/BSDi.
Really? First I've heard about this, and I've been in direct contact
with Sun on this.
This isn't to say that it isn't true, but suffice it to say that I'm
thinking someone may have gotten their stories crossed inside of Sun.
Nate
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From owner-freebsd-java Tue Oct 3 21:41:33 2000
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From: Michael Robinson <robinson@netrinsics.com>
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Subject: Re: Sun Keynote at JavaCon2000
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>FYI, George Paolini (VP Sun) gave a keynote at JavaCon2000, and notable
>on the slides was an official port of JDK1.3 to FreeBSD/BSDi.
And two years ago they had slides with Hotspot outperforming C++.
If Sun/BSDi have multiple programmers tasked, milestones, and a release
schedule, then why is it such a big secret?
If not, then what is that slide supposed to mean? That when Nate and Greg get
done doing all the work in their spare time, Sun will bless it as an official
Sun product (ala Blackdown)? Something else?
-Michael Robinson
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From owner-freebsd-java Wed Oct 4 0: 5: 3 2000
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From: Chris BeHanna <behanna@zbzoom.net>
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To: FreeBSD-Java <java@FreeBSD.ORG>
Subject: Re: Sun Keynote at JavaCon2000
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On Tue, 3 Oct 2000, Mark J. Sommer wrote:
> Oh man, is that ever good news. But we'll wait and see.
>
> [...Sun announced that JDK 1.3 will be ported to FreeBSD...]
I hope they'll port HotSpot while they're at it. The performance
improvement is dramatic.
More good news: there's a JSR in the approval process to add C++
style templates to Java. Hooray!
--
Chris BeHanna
Software Engineer (at yourfit.com)
behanna@zbzoom.net
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From owner-freebsd-java Wed Oct 4 6:57:41 2000
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Date: Wed, 04 Oct 2000 09:57:28 -0400
From: Rob Furphy <rfurphy@ox.com>
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To: behanna@zbzoom.net
Cc: FreeBSD-Java <java@FreeBSD.ORG>
Subject: Re: Sun Keynote at JavaCon2000 - C++ templates
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I'm curious,
what is it about C++ style templates that you feel will be good for
java?
(Anyone?)
I don't see mention of such a jsr here:
http://java.sun.com/aboutJava/communityprocess/search.html
just this (from 1996):
http://developer.java.sun.com/developer/techDocs/SearchData/qa/RE__Templates_in_JAVA.html
and a discussion here
http://forum.java.sun.com/read/16789759/q_7AqCh8PLXkAAZIZ#LR
Rob F.
Chris BeHanna wrote:
> On Tue, 3 Oct 2000, Mark J. Sommer wrote:
>
> > Oh man, is that ever good news. But we'll wait and see.
> >
> > [...Sun announced that JDK 1.3 will be ported to FreeBSD...]
>
> I hope they'll port HotSpot while they're at it. The performance
> improvement is dramatic.
>
> More good news: there's a JSR in the approval process to add C++
> style templates to Java. Hooray!
>
> --
> Chris BeHanna
> Software Engineer (at yourfit.com)
> behanna@zbzoom.net
>
> To Unsubscribe: send mail to majordomo@FreeBSD.org
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From owner-freebsd-java Wed Oct 4 7:36:46 2000
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Date: Thu, 5 Oct 2000 00:36:27 +1000 (EST)
From: Ian Smith <smithi@nimnet.asn.au>
To: "Newman, Alexander" <AJ@AJNewman.net>
Cc: freebsd-java@FreeBSD.ORG
Subject: Re: Sun Keynote at JavaCon2000
In-Reply-To: <39DA42BA.808EB629@AJNewman.net>
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On Tue, 3 Oct 2000, Newman, Alexander wrote:
> FYI, George Paolini (VP Sun) gave a keynote at JavaCon2000, and notable
> on the slides was an official port of JDK1.3 to FreeBSD/BSDi.
Yay!
> Regards (and thanks for all the excellent work)
Aye!
Cheers, Ian
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From owner-freebsd-java Wed Oct 4 8: 1:51 2000
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From: Panagiotis Astithas <past@netmode.ntua.gr>
To: Rob Furphy <rfurphy@ox.com>
Cc: behanna@zbzoom.net, FreeBSD-Java <java@FreeBSD.ORG>
Subject: Re: Sun Keynote at JavaCon2000 - C++ templates
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On Wed, Oct 04, 2000 at 09:57:28AM -0400, Rob Furphy wrote:
> I'm curious,
> what is it about C++ style templates that you feel will be good for
> java?
> (Anyone?)
You may find a few answers here:
http://www.ddj.com/articles/2000/0002/0002a/0002a.htm
-past
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From owner-freebsd-java Wed Oct 4 8:57:19 2000
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To: behanna@zbzoom.net
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Subject: Re: Sun Keynote at JavaCon2000
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> > Oh man, is that ever good news. But we'll wait and see.
> >
> > [...Sun announced that JDK 1.3 will be ported to FreeBSD...]
>
> I hope they'll port HotSpot while they're at it. The performance
> improvement is dramatic.
In order to get 'dramatic' performance, we need kernel threads. FreeBSD
doesn't (yet) have kernel threads.
Nate
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From owner-freebsd-java Wed Oct 4 8:57:57 2000
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Date: Wed, 4 Oct 2000 11:58:30 -0400 (EDT)
From: Chris BeHanna <behanna@zbzoom.net>
Reply-To: behanna@zbzoom.net
To: FreeBSD-Java <java@FreeBSD.ORG>
Subject: Re: Sun Keynote at JavaCon2000 - C++ templates
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On Wed, 4 Oct 2000, Rob Furphy wrote:
> I'm curious, what is it about C++ style templates that you feel will
> be good for java?
> (Anyone?)
Type-safe collections, allowing compile-time type-checking. In
large C++ systems, huge numbers of potential errors are caught this
way. Better 100 compile-time errors than a single run-time
error--*especially* if that error is discovered after deployment!
There are other uses; e.g., generic algorithms implemented in
template classes that again offer compile-time type checking, thereby
reducing the number of run-time type errors that you'd have to track
down.
> I don't see mention of such a jsr here:
> http://java.sun.com/aboutJava/communityprocess/search.html
Try
http://java.sun.com/aboutJava/communityprocess/jsr/jsr_014_gener.html .
--
Chris BeHanna
Software Engineer (at yourfit.com)
behanna@zbzoom.net
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From owner-freebsd-java Wed Oct 4 8:58:43 2000
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To: Michael Robinson <robinson@netrinsics.com>
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Subject: Re: Sun Keynote at JavaCon2000
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<200010040442.e944go000679@netrinsics.com>
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Reply-To: nate@yogotech.com (Nate Williams)
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> >FYI, George Paolini (VP Sun) gave a keynote at JavaCon2000, and notable
> >on the slides was an official port of JDK1.3 to FreeBSD/BSDi.
>
> And two years ago they had slides with Hotspot outperforming C++.
>
> If Sun/BSDi have multiple programmers tasked, milestones, and a release
> schedule, then why is it such a big secret?
>
> If not, then what is that slide supposed to mean? That when Nate and
> Greg get done doing all the work in their spare time, Sun will bless
> it as an official Sun product (ala Blackdown)? Something else?
As I understand, 'official' doesn't mean 'Sun product', but means 'Sun
blessed'. In other words, it passes the JCK, meaning it's an 'official'
Java licensed product just like JBuilder, VCafe, and other Java
products.
Nate
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From owner-freebsd-java Wed Oct 4 9:13: 0 2000
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Date: Wed, 4 Oct 2000 12:13:31 -0400 (EDT)
From: Chris BeHanna <behanna@zbzoom.net>
Reply-To: behanna@zbzoom.net
To: FreeBSD-Java <java@FreeBSD.ORG>
Subject: Re: Sun Keynote at JavaCon2000
In-Reply-To: <200010041557.JAA00298@nomad.yogotech.com>
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On Wed, 4 Oct 2000, Nate Williams wrote:
> > > Oh man, is that ever good news. But we'll wait and see.
> > >
> > > [...Sun announced that JDK 1.3 will be ported to FreeBSD...]
> >
> > I hope they'll port HotSpot while they're at it. The performance
> > improvement is dramatic.
>
> In order to get 'dramatic' performance, we need kernel threads. FreeBSD
> doesn't (yet) have kernel threads.
I don't disagree; however, my own experience was that the quality
of the JIT makes an enormous difference (factor of ten, by my
observation: IBM JDK 1.3.0's JVM executes the LINPACK benchmark ten
times faster than Blackdown's 1.2.2 or Kaffe's JVM).
--
Chris BeHanna
Software Engineer (at yourfit.com)
behanna@zbzoom.net
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From owner-freebsd-java Wed Oct 4 9:16:32 2000
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Subject: Re: Sun Keynote at JavaCon2000
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> > > > Oh man, is that ever good news. But we'll wait and see.
> > > >
> > > > [...Sun announced that JDK 1.3 will be ported to FreeBSD...]
> > >
> > > I hope they'll port HotSpot while they're at it. The performance
> > > improvement is dramatic.
> >
> > In order to get 'dramatic' performance, we need kernel threads. FreeBSD
> > doesn't (yet) have kernel threads.
>
> I don't disagree; however, my own experience was that the quality
> of the JIT makes an enormous difference (factor of ten, by my
> observation: IBM JDK 1.3.0's JVM executes the LINPACK benchmark ten
> times faster than Blackdown's 1.2.2 or Kaffe's JVM).
I didn't make myself clear. In order for HotSpot to have dramatic
performance improvements, we need kernel threads. HotSpot assumes that
multiple system calls can be made at the same time, and as such
*requires* kernel threads. (At least, this is the consensus we came up
with while talking with the Sun engineers.)
Nate
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From owner-freebsd-java Wed Oct 4 14:16: 5 2000
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Subject: Re: Sun Keynote at JavaCon2000 - C++ templates
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Chris BeHanna wrote:
> On Wed, 4 Oct 2000, Rob Furphy wrote:
>
> > I'm curious, what is it about C++ style templates that you feel will
> > be good for java?
> > (Anyone?)
>
> Type-safe collections, allowing compile-time type-checking. In
> large C++ systems, huge numbers of potential errors are caught this
> way. Better 100 compile-time errors than a single run-time
> error--*especially* if that error is discovered after deployment!
>
> There are other uses; e.g., generic algorithms implemented in
> template classes that again offer compile-time type checking, thereby
> reducing the number of run-time type errors that you'd have to track
> down.
What he said :). Yay! I have definitely missed this feature in Java.
Not only do you get the much improved compile time type safety Chris has
mentioned above, there are also potential performance benefits.
- Greg
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Date: Wed, 4 Oct 2000 18:54:57 -0400 (EDT)
From: Chris BeHanna <behanna@zbzoom.net>
Reply-To: behanna@zbzoom.net
To: Jay Sachs <jay@avacet.com>
Cc: Greg Lewis <glewis@trc.adelaide.edu.au>,
FreeBSD-Java <java@FreeBSD.ORG>
Subject: Re: Sun Keynote at JavaCon2000 - C++ templates
In-Reply-To: <39DBA3DF.427E0BF0@avacet.com>
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On Wed, 4 Oct 2000, Jay Sachs wrote:
> Greg Lewis wrote:
> >
> > Chris BeHanna wrote:
> > > On Wed, 4 Oct 2000, Rob Furphy wrote:
> > >
> > > > I'm curious, what is it about C++ style templates that you feel will
> > > > be good for java?
> > > > (Anyone?)
> > >
> > > Type-safe collections, allowing compile-time type-checking. In
> > > large C++ systems, huge numbers of potential errors are caught this
> > > way. Better 100 compile-time errors than a single run-time
> > > error--*especially* if that error is discovered after deployment!
> > >
> > > There are other uses; e.g., generic algorithms implemented in
> > > template classes that again offer compile-time type checking, thereby
> > > reducing the number of run-time type errors that you'd have to track
> > > down.
> >
> > What he said :). Yay! I have definitely missed this feature in Java.
> >
> > Not only do you get the much improved compile time type safety Chris has
> > mentioned above, there are also potential performance benefits.
>
> Unfortunately, these performance benefits won't be realized because of
> the need to maintain compatibility at the JVM level. If you look at GJ
> (nee Pizza I think), the GJ compiler still needs to insert all sorts of
> casts that it knows will succeed.
GJ is a prototype proof-of-concept, not a product-quality
offering.
JVM compatibility is explicitly *NOT* a requirement listed in the
JSR, precisely for this reason. At least, that is to say that .class
files made with an earlier javac are not required to run on a
template-enabled JVM. Source-code backward compatibility is a requirement,
however.
Hearken back:
In the beginning, there was cfront, and yea, verily, it had its
limitations. Time passed, and very good "real" C++ compilers evolved.
I would not expect anything different from GJ and javac.
--
Chris BeHanna
Software Engineer (at yourfit.com)
behanna@zbzoom.net
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From owner-freebsd-java Wed Oct 4 22:52:42 2000
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From: "Renaud Waldura" <renaud@waldura.com>
To: <behanna@zbzoom.net>, "Jay Sachs" <jay@avacet.com>
Cc: "Greg Lewis" <glewis@trc.adelaide.edu.au>,
"FreeBSD-Java" <java@FreeBSD.ORG>
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Subject: Re: Sun Keynote at JavaCon2000 - C++ templates
Date: Wed, 4 Oct 2000 22:52:35 -0700
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How are we going to create those generic classes by name? It doesn't seem to
be addressed in the spec. What if the parameterized type doesn't exist yet?
I don't know about this... It really looks like to me that in effect
parameterized classes are meta-classes, and maybe they should be identified
as such. How about a meta class type, that you can instantiate with your
parameter type the regular way?
It sounds like a parameterized class is a class describing potentially many
very different classes: a meta class. Just like classes specify instances
with different fields, meta classes specify classes with different types.
"Instantiate" a meta class to get a class parameterized to your type.
It feels like we're about to introduce this strange new citizen into the
language, the "parameterized class", which is not really a class, but
somehow is.
--Renaud
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From: Michael Robinson <robinson@netrinsics.com>
Message-Id: <200010051609.e95G91507364@netrinsics.com>
To: freebsd-java@FreeBSD.ORG
Subject: Re: Sun Keynote at JavaCon2000
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>> >FYI, George Paolini (VP Sun) gave a keynote at JavaCon2000, and notable
>> >on the slides was an official port of JDK1.3 to FreeBSD/BSDi.
>As I understand, 'official' doesn't mean 'Sun product', but means 'Sun
>blessed'. In other words, it passes the JCK, meaning it's an 'official'
>Java licensed product just like JBuilder, VCafe, and other Java
>products.
So, basically, the aforementioned slide really means that they've signed
paperwork that allows Nate Williams (or anyone else licensed to use the JCK),
to create "an official port of JDK1.3 to FreeBSD".
You do all the work, they do all the self-congradulation. Same old same old.
-Michael Robinson
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From owner-freebsd-java Thu Oct 5 9:48:35 2000
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From: Chris BeHanna <behanna@zbzoom.net>
Reply-To: behanna@zbzoom.net
To: FreeBSD-Java <java@FreeBSD.ORG>
Subject: Re: Sun Keynote at JavaCon2000 - C++ templates
In-Reply-To: <00e801c02e90$75f47fe0$0302010a@biohz.net>
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On Wed, 4 Oct 2000, Renaud Waldura wrote:
> How are we going to create those generic classes by name? It doesn't
> seem to be addressed in the spec. What if the parameterized type
> doesn't exist yet?
Specializations of a template are created by a compiler on an
as-needed basis. Typically, what is done in C++ is that you #include
the header file that defines the template class, and the specialized
prototypes are generated based upon what uses your compilation module
has for the template. Some C++ compilers will look for a template
implementation in the same location as the header file, while others
require you to #include that, too.
Java does not have a preprocessor, per se; however, an import
specification that imports the template class will allow javac (or
gjc) to generate the specializations required for the uses that the
given compilation module has for the template.
Example:
--- file HashMap.java
public class<S,T> HashMap implements Map {
//... ctors and stuff go here
public void add( S key, T obj) { ... }
public T get( S key) { ... }
// and so on
}
--- file Fred.java
import java.util.Map;
import java.util.HashMap;
public class Fred {
Map map = new HashMap<String,String>();
public static void main(String[] args) {
Fred f = new Fred();
for( int i=0; i<(args.length)/2; i+=2) {
f.add( args[i], args[i+1]);
}
}
}
That's a contrived example, to be sure. In this case, a
specialization of HashMap<S,T> to HashMap<String,String> is generated,
which then becomes a first-class type. Its add method is specialized
to
public void add( String key, String obj)
and its get method is specialized to
public String get( String key)
This way, the compiler can catch any problems with trying to pass
parameters of the wrong type or trying to assign to values of the
wrong type.
Yes, these errors can creep into large systems when the left hand
is not aware of what the right is doing, and vice-versa. It's just
one more thing to help you with correctness of your software, and,
because the Java can know in advance that the specialization is of a
specific type, more efficient bytecode can be generated (and, perhaps,
the JIT can generate more efficient native code).
> I don't know about this... It really looks like to me that in effect
> parameterized classes are meta-classes, and maybe they should be identified
> as such. How about a meta class type, that you can instantiate with your
> parameter type the regular way?
>
> It sounds like a parameterized class is a class describing potentially many
> very different classes: a meta class. Just like classes specify instances
> with different fields, meta classes specify classes with different types.
> "Instantiate" a meta class to get a class parameterized to your type.
>
> It feels like we're about to introduce this strange new citizen into the
> language, the "parameterized class", which is not really a class, but
> somehow is.
This sounds to me more like a nomenclature problem. In C++ land,
the addition of templates allowed people to get away from using awful
DECLARE() macros. Although we don't have a macro preprocessor in
Java, someone could easily use the C preprocessor to do the same
thing, if they really had to (I even thought of doing this myself, to
avoid the ugliness and lack of run-time type safety that ensues from
having to cast everything back from Object when using Java
collections).
--
Chris BeHanna
Software Engineer (at yourfit.com)
behanna@zbzoom.net
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From owner-freebsd-java Thu Oct 5 9:50: 0 2000
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To: Michael Robinson <robinson@netrinsics.com>
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Subject: Re: Sun Keynote at JavaCon2000
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> >> >FYI, George Paolini (VP Sun) gave a keynote at JavaCon2000, and notable
> >> >on the slides was an official port of JDK1.3 to FreeBSD/BSDi.
>
> >As I understand, 'official' doesn't mean 'Sun product', but means 'Sun
> >blessed'. In other words, it passes the JCK, meaning it's an 'official'
> >Java licensed product just like JBuilder, VCafe, and other Java
> >products.
>
> So, basically, the aforementioned slide really means that they've signed
> paperwork that allows Nate Williams (or anyone else licensed to use the JCK),
> to create "an official port of JDK1.3 to FreeBSD".
Sort of. The license isn't *yet* signed, because Sun's lawyers are
having a difficult time finding acceptable verbage that allows us to do
everything we want to do. However, I've been promised I'll have
something in hand before ApacheCon.
Dealing with big companies and lawyers has been an 'enlightening'
experience, that's for sure. :) :)
Nate
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From: "Aleksandar Simic'" <alex@frustum.clara.co.uk>
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Subject: FreeBSD Java
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From owner-freebsd-java Fri Oct 6 8:23:43 2000
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Date: Fri, 6 Oct 2000 16:27:15 +0100
From: "Aleksandar Simic'" <alex@frustum.clara.co.uk>
To: freebsd-java@freebsd.org
Subject: Java CLASSPATH problem
Message-ID: <20001006162715.A745@frustum.clara.co.uk>
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Hello,
I just installed Java and I cannot get it to work properly. If you can
help me I would be very grateful.
Here is the necessary information:
[alex@~/study/internet_prog_3sfe217] uname -a
FreeBSD myname.my.domain 4.0-RELEASE FreeBSD 4.0-RELEASE #3: Sat May
27 19:54:30 BST 2000 alex@myname.my.domain:/usr/src/sys/compile/ALEX
i386
// A first java program
// HelloWorld.java
class HelloWorld
{
public static void main (String args[])
{
System.out.println("Hello world");
}
}
paths to java:
[alex@~/study/internet_prog_3sfe217] which java
/usr/local/jdk1.1.8/bin/java
[alex@~/study/internet_prog_3sfe217] which javac
/usr/local/jdk1.1.8/bin/javac
[alex@~/study/internet_prog_3sfe217]
classpath set in ~/.profile:
CLASSPATH=.:/usr/local/jdk1.1.8/lib/calsses.zip; export CLASSPATH
[alex@~/study/internet_prog_3sfe217] echo $CLASSPATH
.:/usr/local/jdk1.1.8/lib/calsses.zip
Then I do this:
[alex@~/study/internet_prog_3sfe217] javac HelloWorld.java
[alex@~/study/internet_prog_3sfe217] java HelloWorld.class
Can't find class HelloWorld.class
[alex@~/study/internet_prog_3sfe217] ls -l
total 2823
drwxr-xr-x 2 alex alex - 512 Oct 6 16:21 ./
drwxr-xr-x 14 alex alex - 512 Oct 6 00:00 ../
-rw-r--r-- 1 alex alex - 471 Oct 6 16:13 HelloWorld.class
-rw-r--r-- 1 alex alex - 137 Oct 6 00:11 HelloWorld.java
-rw-r--r-- 1 alex alex - 27583 Oct 6 01:12 install_java.html
-rw-r--r-- 1 alex alex - 2842999 Oct 6 01:35 jdk-1_1_8_003-doc.tar.gz
[alex@~/study/internet_prog_3sfe217]
What am I doing wrong ? Thank you in advance.
--Alex
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From owner-freebsd-java Fri Oct 6 8:29:35 2000
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Date: Sat, 07 Oct 2000 00:29:59 +0900
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From: Fuyuhiko Maruyama <fuyuhik8@is.titech.ac.jp>
To: alex@frustum.clara.co.uk
Cc: freebsd-java@freebsd.org
Subject: Re: Java CLASSPATH problem
In-Reply-To: In your message of "Fri, 6 Oct 2000 16:27:15 +0100"
<20001006162715.A745@frustum.clara.co.uk>
References: <20001006162715.A745@frustum.clara.co.uk>
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Hi,
At Fri, 6 Oct 2000 16:27:15 +0100,
Aleksandar Simic' <alex@frustum.clara.co.uk> wrote:
> classpath set in ~/.profile:
> CLASSPATH=.:/usr/local/jdk1.1.8/lib/calsses.zip; export CLASSPATH
^^^^^^^typo?
>
> [alex@~/study/internet_prog_3sfe217] echo $CLASSPATH
> .:/usr/local/jdk1.1.8/lib/calsses.zip
^^^^^^^typo?
In fact, you need not specify these.
> [alex@~/study/internet_prog_3sfe217] javac HelloWorld.java
> [alex@~/study/internet_prog_3sfe217] java HelloWorld.class
All you need to run your HelloWorld is
java HelloWorld
The suffix '.class' is never needed.
Go!
--
Fuyuhiko MARUYAMA <fuyuhik8@is.titech.ac.jp>
Matsuoka laboratory,
Department of Mathematical and Computing Sciences,
Graduate School of Information Science and Engineering,
Tokyo Institute of Technology.
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From owner-freebsd-java Fri Oct 6 8:31:40 2000
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From: saad rehmani <bonga@aitchisonians.org>
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To: Aleksandar Simic' <alex@frustum.clara.co.uk>
Cc: freebsd-java@FreeBSD.ORG
Subject: Re: Java CLASSPATH problem
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[alex@~/study/internet_prog_3sfe217] echo $CLASSPATH
.:/usr/local/jdk1.1.8/lib/calsses.zip
for one, you've misspelt classes.zip it seems.
-saad
On Fri, 6 Oct 2000, Aleksandar Simic' wrote:
> Hello,
>
> I just installed Java and I cannot get it to work properly. If you can
> help me I would be very grateful.
>
> Here is the necessary information:
>
> [alex@~/study/internet_prog_3sfe217] uname -a
> FreeBSD myname.my.domain 4.0-RELEASE FreeBSD 4.0-RELEASE #3: Sat May
> 27 19:54:30 BST 2000 alex@myname.my.domain:/usr/src/sys/compile/ALEX
> i386
>
> // A first java program
> // HelloWorld.java
> class HelloWorld
> {
> public static void main (String args[])
> {
> System.out.println("Hello world");
> }
> }
>
> paths to java:
>
> [alex@~/study/internet_prog_3sfe217] which java
> /usr/local/jdk1.1.8/bin/java
> [alex@~/study/internet_prog_3sfe217] which javac
> /usr/local/jdk1.1.8/bin/javac
> [alex@~/study/internet_prog_3sfe217]
>
> classpath set in ~/.profile:
> CLASSPATH=.:/usr/local/jdk1.1.8/lib/calsses.zip; export CLASSPATH
>
> [alex@~/study/internet_prog_3sfe217] echo $CLASSPATH
> .:/usr/local/jdk1.1.8/lib/calsses.zip
>
> Then I do this:
>
> [alex@~/study/internet_prog_3sfe217] javac HelloWorld.java
> [alex@~/study/internet_prog_3sfe217] java HelloWorld.class
> Can't find class HelloWorld.class
> [alex@~/study/internet_prog_3sfe217] ls -l
> total 2823
> drwxr-xr-x 2 alex alex - 512 Oct 6 16:21 ./
> drwxr-xr-x 14 alex alex - 512 Oct 6 00:00 ../
> -rw-r--r-- 1 alex alex - 471 Oct 6 16:13 HelloWorld.class
> -rw-r--r-- 1 alex alex - 137 Oct 6 00:11 HelloWorld.java
> -rw-r--r-- 1 alex alex - 27583 Oct 6 01:12 install_java.html
> -rw-r--r-- 1 alex alex - 2842999 Oct 6 01:35 jdk-1_1_8_003-doc.tar.gz
> [alex@~/study/internet_prog_3sfe217]
>
>
> What am I doing wrong ? Thank you in advance.
>
> --Alex
>
>
> To Unsubscribe: send mail to majordomo@FreeBSD.org
> with "unsubscribe freebsd-java" in the body of the message
>
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From owner-freebsd-java Fri Oct 6 8:43:36 2000
Delivered-To: freebsd-java@freebsd.org
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(envelope-from alex)
Date: Fri, 6 Oct 2000 16:48:44 +0100
From: "Aleksandar Simic'" <alex@frustum.clara.co.uk>
To: Fuyuhiko Maruyama <fuyuhik8@is.titech.ac.jp>
Cc: freebsd-java@freebsd.org
Subject: Re: Java CLASSPATH problem
Message-ID: <20001006164844.A864@frustum.clara.co.uk>
References: <20001006162715.A745@frustum.clara.co.uk> <55d7hem1hk.wl@is.titech.ac.jp>
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In-Reply-To: <55d7hem1hk.wl@is.titech.ac.jp>; from fuyuhik8@is.titech.ac.jp on Sat, Oct 07, 2000 at 12:29:59AM +0900
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On Sat, Oct 07, 2000 at 12:29:59AM +0900, Fuyuhiko Maruyama wrote:
> Hi,
>
> At Fri, 6 Oct 2000 16:27:15 +0100,
> Aleksandar Simic' <alex@frustum.clara.co.uk> wrote:
> > classpath set in ~/.profile:
> > CLASSPATH=.:/usr/local/jdk1.1.8/lib/calsses.zip; export CLASSPATH
> ^^^^^^^typo?
Doh ! [hits the head on the nearest wall *really* hard, repeatedly]
> > [alex@~/study/internet_prog_3sfe217] echo $CLASSPATH
> > .:/usr/local/jdk1.1.8/lib/calsses.zip
> ^^^^^^^typo?
[and again]
> In fact, you need not specify these.
>
> > [alex@~/study/internet_prog_3sfe217] javac HelloWorld.java
> > [alex@~/study/internet_prog_3sfe217] java HelloWorld.class
> All you need to run your HelloWorld is
> java HelloWorld
> The suffix '.class' is never needed.
That solved the problem. Thank you. And thanks to the rest of you for
pointing this out. Fuyuhiko just happen to be the first one to spot
it.
> Go!
Yep, I'm going ... going to sit in the corner and die of embarrassment
:(
Thanks again to all.
--Alex
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From owner-freebsd-java Fri Oct 6 9:18:50 2000
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(envelope-from jpt)
From: Joseph Thomas <jpt@networkcs.com>
Message-Id: <200010061618.LAA09698@us.networkcs.com>
Subject: Re: Java CLASSPATH problem
To: alex@frustum.clara.co.uk (Aleksandar Simic')
Date: Fri, 6 Oct 2000 11:18:45 -0500 (CDT)
Cc: fuyuhik8@is.titech.ac.jp (Fuyuhiko Maruyama),
freebsd-java@FreeBSD.ORG
In-Reply-To: <20001006164844.A864@frustum.clara.co.uk> from "Aleksandar Simic'" at Oct 06, 2000 04:48:44 PM
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>
> [and again]
>
> > In fact, you need not specify these.
> >
> > > [alex@~/study/internet_prog_3sfe217] javac HelloWorld.java
> > > [alex@~/study/internet_prog_3sfe217] java HelloWorld.class
> > All you need to run your HelloWorld is
> > java HelloWorld
> > The suffix '.class' is never needed.
>
> That solved the problem. Thank you. And thanks to the rest of you for
> pointing this out. Fuyuhiko just happen to be the first one to spot
> it.
>
I think it's more an issue of you CAN'T specify the trailing
'.class'. Someone will correct me if I'm wrong but I believe that
java will always append the .class so that when you say
java HelloWorld.class
it looks for HelloWorld.class.class.
--
Joseph Thomas E/Mail: jpt@networkcs.com
Network Computing Services, Inc. jpt@magic.net
1200 Washington Ave So. Tel: +1 612 337 3558
Minneapolis, MN 55415-1227 FAX: +1 612 337 3400
An elephant is a mouse with an operating system.
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From owner-freebsd-java Fri Oct 6 11:56:46 2000
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(envelope-from rasputin)
Date: Fri, 6 Oct 2000 19:56:41 +0100
From: Rasputin <rasputin@FreeBSD-uk.eu.org>
To: freebsd-java@freebsd.org
Subject: Re: Java CLASSPATH problem
Message-ID: <20001006195641.A63752@dogma.freebsd-uk.eu.org>
References: <20001006164844.A864@frustum.clara.co.uk> <200010061618.LAA09698@us.networkcs.com>
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On Fri, Oct 06, 2000 at 11:18:45AM -0500, Joseph Thomas wrote:
> >
> > [and again]
> >
> > > In fact, you need not specify these.
> > >
> > > > [alex@~/study/internet_prog_3sfe217] javac HelloWorld.java
> > > > [alex@~/study/internet_prog_3sfe217] java HelloWorld.class
> > > All you need to run your HelloWorld is
> > > java HelloWorld
> > > The suffix '.class' is never needed.
> >
> > That solved the problem. Thank you. And thanks to the rest of you for
> > pointing this out. Fuyuhiko just happen to be the first one to spot
> > it.
> >
>
> I think it's more an issue of you CAN'T specify the trailing
> '.class'. Someone will correct me if I'm wrong but I believe that
> java will always append the .class so that when you say
> java HelloWorld.class
> it looks for HelloWorld.class.class.
AFAIK, the '.' is interpreted the same way it is in an 'import'
statement i.e.
java HelloWorld.class
means:
Run the class called 'class' in the package(directory) called
HelloWorld.
But then we knew that, didn't we?
--
Rasputin
Jack of All Trades :: Master of Nuns
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