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Re: HELP: java path and classpath question
- From: wally liau <wally_2nd at yahoo dot com>
- To: Randall R Schulz <rrschulz at cris dot com>, cygwin at cygwin dot com
- Date: Mon, 11 Feb 2002 14:39:49 -0800 (PST)
- Subject: Re: HELP: java path and classpath question
He Randall, thanks a lot for the message.
The java compiler I am using is called generic java
(with extended utility classes, see
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.
I think you are right about
--- Randall R Schulz <email@example.com> wrote:
> [ 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)
> 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
> >alias gjc='java -ms12m gjc.Main -bootclasspath
> >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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