Re: Help, Setting classpath, using external java libraries with Kawa

[Vasantha Ganesh <vasanthaganesh dot k at gmail dot com>]

Hello,
  I'm trying to convert this(http://lpaste.net/354170) Java code into
Scheme(Kawa) (http://lpaste.net/354171).

I ran this for java and it ran without hickups,

java -cp /usr/share/java/jnr-ffi.jar:.:/usr/lib/java/jffi.jar:/usr/lib/java/jffi-native.jar:/usr/share/java/objectweb-asm/asm.jar
Getpid.java

and for kawa, I ran this:

kawa -J -cp /usr/share/java/jnr-ffi.jar:.:/usr/lib/java/jffi.jar:/usr/lib/java/jffi-native.jar:/usr/share/java/objectweb-asm/asm.jar
getpid.scm

The exact error that I get is:

Error: Could not find or load main class

Thank you,

Vasantha Ganesh K.

On Sat, Apr 1, 2017 at 6:24 PM, Per Bothner <per@bothner.com> wrote:
> On 04/01/2017 02:35 AM, Vasantha Ganesh wrote:
>>
>> Hello Bothner,
>>   This is probably a noob question. In Java while compiling and using
>> external libraries  we use -classpath option. How to use external java
>> libraries with Kawa?
>>
>> I read https://www.gnu.org/software/kawa/Compiling.html
>>
>> Then I tried to compile scheme program with `--main` and `-C` options
>> and generated a .class file. Then I tried to  run it with Java like a
>> normal class file by setting -classpath option, but I get:
>>
>> Error: Could not find or load main class somescript
>>
>> I also tried the -J option with kawa and I get
>>
>> Error: Could not find or load main class
>>
>> I also tried to set the CLASSPATH to the external library (jar file),
>> it does not work.
>
>
> Show us the actual commands you're trying, including the command used
> to create the jar file.
>
> Both setting CLASSPATH and using -J should work.
>
> Note you have to use a separate -J option for each "word":
>
> kawa -J-cp -Jfoo.jar
>
> is roughly equivalent to
>
> java -cp foo.jar kawa.repl
>
> On 04/01/2017 04:23 AM, Sudarshan S Chawathe wrote:>> From: Vasantha Ganesh
> <vasanthaganesh.k@gmail.com>
>
>> If I understand your question correctly then it seems you need to use
>> the -D option to define java.library.path suitably.  Example:
>>
>>   kawa -Djava.library.path="/where/the/java/libs/are:/another/one:/so/on"
>
>
> The java.library.path relates to native libraries (.so/.dll, not .class or
> .jar files).
> It don't think it is relevant here.
> --
>         --Per Bothner
> per@bothner.com   http://per.bothner.com/