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Re: HELP: java path and classpath question
- From: Randall R Schulz <rrschulz at cris dot com>
- To: wally liau <wally_2nd at yahoo dot com>, cygwin at cygwin dot com
- Date: Mon, 11 Feb 2002 11:11:49 -0800
- Subject: Re: HELP: java path and classpath question
[ 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,
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.
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
>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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