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Message-ID: <20020211223949.70868.qmail@web13401.mail.yahoo.com>
Date: Mon, 11 Feb 2002 14:39:49 -0800 (PST)
From: wally liau <wally_2nd AT yahoo DOT com>
Subject: Re: HELP: java path and classpath question
To: Randall R Schulz <rrschulz AT cris DOT com>, cygwin AT cygwin DOT com
In-Reply-To: <5.1.0.14.2.20020211105436.024f3b00@pop3.cris.com>
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He Randall, thanks a lot for the message. 

The java compiler I am using is called generic java
(with extended utility classes, see
http://www.research.avayalabs.com/user/wadler/pizza/gj/and
http://developer.java.sun.com/developer/earlyAccess/adding_generics/).


those environment variables and alias are set in
.bashrc. "gjc" is supposed to compile java source
files containing templates into stardard class files. 

I am confused with cygwin- and window-style paths. A
simple question is which style to use in order to
invoke window java vm, and if window-style path is the
one to be used, how to put it in a file like .bashrc. 

Thanks again. 

I think you are right about 
--- Randall R Schulz <rrschulz AT cris DOT com> wrote:
> Wally,
> 
> [ For those of us doing Java programming under
> Cygwin, this has become a 
> FAQ and there are messages in the Cygwin mail
> archive that cover it. ]
> 
> 
> Please give us more information about what happens.
> Specifically, what 
> commands are you issuing. Tell us what program
> you're invoking (since your 
> alias invokes the "java" command via the PATH, tell
> us what PATH is so we 
> know which java command is being executed). Tell us
> what error message(s) 
> result.
> 
> 
> After I see through the confusing names that suggest
> that you're using the 
> Gnu Java Compiler (which, as far as I know, is not
> yet available for 
> Cygwin), it appears that at least part of your
> problem (quite possibly all 
> of it) is that you're using POSIX-style class-path
> syntax when in fact 
> you're invoking a Windows Java VM and hence must use
> a Windows-style 
> class-path (semicolons separating the components and
> Windows-style full 
> names, not Cygwin / POSIX -style). This applies both
> to the CLASSPATH 
> environment variable and the various file name and
> class-path arguments to 
> the JVM / JRE and Java compiler (all the Sun JDK and
> / or JRE executables, 
> in fact).
> 
> If you're unaware of how to accommodate this, look
> into the "cygpath" 
> command. It translates path names between POSIX and
> Windows formats. It can 
> operate on an individual file name or PATH
> variable-like strings. There's 
> no man page, use "cygpath --help".
> 
> For your own convenience, I suggest you write some
> wrapper scripts that 
> obscure the need for Windows file name and path
> formats by transforming 
> Cygwin-style arguments to their Windows equivalents
> for you. Otherwise your 
> makefiles and other build scripts lose their
> portability to other POSIX 
> environments. I use a generic script that I link
> (hard or symbolic) to a 
> file with the same name as the target command. That
> way I achieve complete 
> transparency and / or compatibility with native
> POSIX environments such as 
> Solaris, Linux or *BSD and need only make a new link
> should a new tool be 
> added to the Java SDK.
> 
> Randall Schulz
> Mountain View, CA USA
> 
> 
> At 10:45 2002-02-11, wally liau wrote:
> >I am having a problem compiling generic java source
> file with following 
> >settings:
> >
> >alias gjc='java -ms12m gjc.Main -bootclasspath
>
>$GJ_HOME/classes:/cygdrive/c/jdk1.3.1_01/jre/lib/rt.jar:/cygdrive/c/jdk1.3.1_01/jre/lib/i18n.jar'
> >
> >
> >export JAVA_HOME=/cygdrive/c/jdk1.3.1_01
> >export GJ_HOME=/cygdrive/c/Programs/gj
> >
> >The error messages show that cygwin can't find java
> class (eg, it can't 
> >find String class). However, compiling stardard
> java code using "javac" 
> >works fine. I guess there may be some problems with
> how to set up paths 
> >and hope someone out there could help me to fix it.
> Thanks a lot.
> 


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