[Plplot-devel] Java examples don't work for me

[Alan W. I. <ir...@be...>]

I tried plplot java with both the IBM jdk and Blackdown version.  (Both are
version 1.1.8.) (BTW, kaffe is not a complete JDK so it is out of the
running.) Both the IBM and Blackdown versions worked with no problems
up to and including make jdemos.  After that, however, no example
would work.

Here was my environment (for the Blackdown version.  The IBM version
was the same except for JAVA_HOME.)

pwd
/home/software/plplot_cvs/HEAD/plplot/tmp

printenv JAVA_HOME
/usr/lib/jdk1.1/

printenv CLASSPATH
java

Note I also tried this as an absolute path and it did not work.

printenv LD_LIBRARY_PATH
/home/software/plplot_cvs/HEAD/plplot/tmp

ls java/plplot/examples/
x01.class*  x04.java@   x08.class*  x11.java@   x15.class*  x18.java@
x01.java@   x05.class*  x08.java@   x12.class*  x15.java@   x19.class*
x02.class*  x05.java@   x09.class*  x12.java@   x16.class*  x19.java@
x02.java@   x06.class*  x09.java@   x13.class*  x16.java@
x03.class*  x06.java@   x10.class*  x13.java@   x17.class*
x03.java@   x07.class*  x10.java@   x14.class*  x17.java@
x04.class*  x07.java@   x11.class*  x14.java@   x18.class*

Here is the error message when I attempted to execute the first example.

java plplot/examples/x01
Invalid class name: plplot/examples/x01
Usage: java [-options] class
.
.
.

To test that my jdk was working, I compiled the following incredibly
complicated programme:
**************
class HelloWorld
{

   public static void main(String args[])
     {

	System.out.println("Hello World!");
     }

}

javac compiled it and java ran it without problems.  I also tried
appletview on several rather complicated examples such as molecule viewing,
etc.  They all worked.

Thus, I am stumped why plplot java does not work for me when I believe
I have followed Geoffrey's cookbook exactly.

But wait.... After thinking about that last sentence I tried moving my hello
world programme around.  If I execute it as java HelloWorld (i.e., no
partial path before HelloWorld and with CLASSPATH set to the *entire path*)
it works fine.  But any attempt to have a partial pathname with it, e.g.,
setenv CLASSPATH /home; java irwin/HelloWorld produces the same bad symptoms
as above. So for my version of java it seems no partial path can be part of
the class name when java executes a class.  Armed with that knowledge, I tried

setenv CLASSPATH java/plplot/examples
java x03
Error loading class x03: Wrong name

so clearly this "full CLASSPATH" strategy isn't the whole answer.

Do you have any ideas how to overcome these CLASSPATH problems, Geoffrey?

Does JDK-1.1.8 have a limitation that your JDK does not have?

Alan

email: ir...@be...
phone: 250-727-2902	FAX: 250-721-7715
snail-mail:
Dr. Alan W. Irwin
Department of Physics and Astronomy,
University of Victoria, P.O. Box 3055,
Victoria, British Columbia, Canada, V8W 3P6
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