Re: new JVM feature, just an idea

Rodrigo Ruiz Mon, 15 Dec 2003 01:53:22 -0800

Just an idea, a jar archive can contain a list of jar dependencies in its META-INF/manifest.mf file. You could create such a jar in a fixed location in your system, and set your CLASSPATH point to it.

An example of such a manifest could be:

Manifest-Version: 1.0
Created-By: myself
Class-Path: d:\usr\local\jakarta\apache-ant-1.5.4\lib\xmltask.jar
d:\usr\local\jakarta\apache-ant-1.5.4\lib\xml-apis.jar
d:\usr\local\jakarta\apache-ant-1.5.4\lib\xercesImpl.jar
d:\usr\local\jakarta\apache-ant-1.5.4\lib\optional.jar
d:\usr\local\jakarta\apache-ant-1.5.4\lib\ant.jar
d:\arquiv~1\j2sdk1.4.1_01\commapi\comm.jar
d:\usr\local\skinlf-1.2.4\lib\skinregion.jar;
...

This way, including this jar in your classpath will be equivalent to include all its dependencies :-)

Another think that could help would be to create a d:\jars directory, and place a copy of all your jars into it. This way, the CLASSPATH variable will be shorter (and BTW, your ant scripts too ;-)

Hope this helps,
Rodrigo Ruiz

Edson Alves Pereira wrote:

        That�s right, but even using a GUI IDE like JBuilder or Netbeans
this problem can occours, because in a low level these tools make a command
like to compile, to build a webbapp or to create a jar file.
----------
De:     Shapira, Yoav[SMTP:[EMAIL PROTECTED]
Responder:      Tomcat Users List
Enviada:        sexta-feira, 12 de dezembro de 2003 15:18
Para:   Tomcat Users List
Assunto:        RE: new JVM feature, just an idea
Howdy,

And Yoav, you did say that in almost 10 years no one complains about it, but as i know there are many people facing this issue all over

internet

also. My neibour here has a windows 2000, he will make some tests with

its

command line.
I misunderstood your problem when I said no one else has it.  What you
describe is a common issue.  It used to be more common before people used
Ant and IDEs, when they did more stuff on the command line.  I just
haven't compiled anything in a DOS window for ages, so I forgot ;)
Yoav Shapira
----------
De:     Shapira, Yoav[SMTP:[EMAIL PROTECTED]
Responder:      Tomcat Users List
Enviada:        sexta-feira, 12 de dezembro de 2003 14:41
Para:   Tomcat Users List
Assunto:        RE: new JVM feature, just an idea
Howdy,
I see -- thanks for the example.
You do realize Ant adds a lot of these jars for you automatically to
the

classpath, right? You don't need to add anything in ANT_HOME/lib, as that's automatically included. Furthermore, if you're using JDK 1.4 or later, you can remove a bunch of other jars from the path as they're included in the JDK, e.g. JAXP, Crimson, JDBC 2.0 extensions. Finally, you have a number of duplicates, e.g. the XML APIs, repeated a number

of
times in the path.
Yoav Shapira
Millennium ChemInformatics
-----Original Message-----
From: Edson Alves Pereira [mailto:[EMAIL PROTECTED]
Sent: Friday, December 12, 2003 1:35 PM
To: 'Tomcat Users List'
Subject: RE: new JVM feature, just an idea
This mainly it happen with ant, here a snapshot of it:

D:\home\edson>set LOCALCLASSPATH=d:\usr\local\jakarta\apache-ant-1.5.4\lib\xmlta sk.jar;d:\usr\local\jakarta\apache-ant-1.5.4\lib\xml- apis.jar;d:\usr\local\j akar
ta\apache-ant-1.5.4\lib\xercesImpl.jar;d:\usr\local\jakarta\apache-ant-

1.5.4 \lib \optional.jar;d:\usr\local\jakarta\apache-ant- 1.5.4\lib\ant.jar;d:\arquiv~1\ j2sd k1.4.1_01\commapi\comm.jar;d:\usr\local\skinlf- 1.2.4\lib\skinregion.jar;d:\u sr\l ocal\skinlf-1.2.4\lib\skinlf.jar;d:\usr\local\ecs-1.4.1\lib\xerces- 1.2.2.jar ;d:\ usr\local\ecs-1.4.1\lib\jakarta-regexp-1.2.jar;d:\usr\local\ecs-

1.4.1\ecs

-

1. 4.1.

jar;d:\usr\local\java_cup\java_cup.jar;d:\usr\local\hsqldb_v.1.61\lib\hs
q

ld

b .jar ;d:\usr\local\junit3.7\junit.jar;d:\usr\local\jakarta\apache-ant- 1.5.4\lib\x mlta sk.jar;d:\usr\local\jakarta\apache-ant-1.5.4\lib\xml- apis.jar;d:\usr\local\j akar

ta\apache-ant-1.5.4\lib\xercesImpl.jar;d:\usr\local\jakarta\apache-ant-

1.5.4 \lib \optional.jar;d:\usr\local\jakarta\apache-ant- 1.5.4\lib\ant.jar;d:\desenv\os ctrl

_lib\classes;d:\desenv\osctrl\classes;d:\desenv\pannet\src\servlets\ifin

a

nc

e \cla

sses;d:\desenv\pannet\src\servlets\intranet\classes;d:\desenv\pannet\src

\

se

r vlet

s\panfinance\classes;d:\desenv\pannet\src\servlets\base\classes;d:\desen

v
\p

a nnet \java-lib\jasper-runtime.jar;d:\desenv\pannet\java-lib\jasper- compiler.jar;d :\de senv\pannet\java-lib\jdbc2_0-stdext.jar;d:\desenv\pannet\java- lib\tinySQL.ja r;d: \desenv\pannet\java-lib\servlet.jar;d:\desenv\pannet\java- lib\ojdbc14.jar;d: \des env\pannet\java-lib\shell_term.jar;d:\desenv\pannet\java- lib\crimson.jar;d:\ dese nv\pannet\java-lib\jconcept.zip;d:\desenv\pannet\java- lib\com.zip;d:\desenv\ pann et\java-lib\acme.zip;d:\desenv\pannet\java- lib\xBaseJ.jar;d:\desenv\pannet\j ava- lib\oreilly.jar;d:\desenv\pannet\java-

lib\mail.jar;d:\desenv\pannet\java-
lib
\jst
yle.jar;d:\desenv\pannet\java-lib\jndi.jar;d:\desenv\pannet\java-
lib\jcServl
et.j
ar;d:\desenv\pannet\java-
lib\activation.jar;d:\jbuilder4\lib\jaxp.jar;d:\arq
uiv~
1\j2sdk1.4.1_01\lib\tools.jar;d:\arquiv~1\j2sdk1.4.1_01\lib\dt.jar;.;;
        I couldn�t take correctly ant�s command line, but i think that it
gives some idea.
----------
De:     Shapira, Yoav[SMTP:[EMAIL PROTECTED]
Responder:      Tomcat Users List
Enviada:        sexta-feira, 12 de dezembro de 2003 14:07
Para:   Tomcat Users List
Assunto:        RE: new JVM feature, just an idea
Howdy, It's fascinating other people in the almost decade-long history of
the
language haven't had this problem. Don't you find that curious? ;)

Can
you post one such classpath example that's giving you problems?
Yoav Shapira
Millennium ChemInformatics
-----Original Message-----
From: Edson Alves Pereira [mailto:[EMAIL PROTECTED]
Sent: Friday, December 12, 2003 1:03 PM
To: 'Tomcat Users List'
Subject: RE: new JVM feature, just an idea
Exactly, that�s it! Even using environment variable in a
MSDOS
shell
you can reach the line limit.
----------
De:     Shapira, Yoav[SMTP:[EMAIL PROTECTED]
Responder:      Tomcat Users List
Enviada:        sexta-feira, 12 de dezembro de 2003 13:57
Para:   Tomcat Users List
Assunto:        RE: new JVM feature, just an idea
Howdy, So you really have a classpath environment variable that's bigger
than
128KB? (If that's really the limit, as you say in your original

message).
Yoav Shapira
Millennium ChemInformatics
-----Original Message-----
From: Edson Alves Pereira [mailto:[EMAIL PROTECTED]
Sent: Friday, December 12, 2003 12:51 PM
To: 'Tomcat Users List'
Subject: RE: new JVM feature, just an idea
The point here is that my classpath is very big and even
using
environment variables winnt complain about it.
----------
De:     Shapira, Yoav[SMTP:[EMAIL PROTECTED]
Responder:      Tomcat Users List
Enviada:        sexta-feira, 12 de dezembro de 2003 10:47
Para:   Tomcat Users List
Assunto:        RE: new JVM feature, just an idea
Howdy, You can use the environment variables on windows as well. And
FYI,

though

I'm not a big M$ fan, Windows XP and 2003 are not bad, I've
been
working
with them a bit without stability problems.
Yoav Shapira
Millennium ChemInformatics
-----Original Message----- From: Edson Alves Pereira
[mailto:[EMAIL PROTECTED]
Sent: Friday, December 12, 2003 9:16 AM
To: 'Tomcat-User List'
Subject: new JVM feature, just an idea
Hello folks, as you know windows has a limit for
command-line (

something like 128kb ), i�m not a windows fan, but here for a
while

i

still

using this OS.

Then as we cannot change this behaviour ( in win95, win98

and

winnt,

others i don�t known and i hope never use them ), would be a
good

idea

make

JVM read classpath form a file named .javarc like
.bash_profile
and
there
create a entrypoint like:
###########################################################
#/home/edson/.javarc
classpath=d:\arquiv~1\j2sdk1.4.1_01\commapi\comm.jar;\
d:\usr\local\skinlf-1.2.4\lib\skinregion.jar;\
d:\usr\local\skinlf-1.2.4\lib\skinlf.jar;\
d:\usr\local\ecs-1.4.1\lib\xerces-1.2.2.jar;\
d:\usr\local\ecs-1.4.1\lib\jakarta-regexp-1.2.jar;\
d:\usr\local\ecs-1.4.1\ecs-1.4.1.jar;\
d:\usr\local\java_cup\java_cup.jar;\
d:\usr\local\hsqldb_v.1.61\lib\hsqldb.jar;\
d:\usr\local\junit3.7\junit.jar;\
d:\usr\local\jakarta\apache-ant-1.5.4\lib\xmltask.jar;\
d:\usr\local\jakarta\apache-ant-1.5.4\lib\xml-apis.jar;\
d:\usr\local\jakarta\apache-ant-1.5.4\lib\xercesImpl.jar;\
d:\usr\local\jakarta\apache-ant-1.5.4\lib\optional.jar;\
d:\usr\local\jakarta\apache-ant-1.5.4\lib\ant.jar;
###########################################################
Here i give up to find a solution for my winnt, because
there

isn�t

solution. Then i�ll create a new ClassLoader for my winnt

machine

to

find

my classpath in this file also. What do you think about it? Does

it

could

be

a

good implementation for JVM for windows or all JVMs?

Regards, Edson

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Re: new JVM feature, just an idea

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