Mail Archives: cygwin/2002/02/11/17:40:34
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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