Re: [Jython-dev] Trying to make my "hello world" to run as a compiled class

[Robert W. B. <rb...@di...>]

On Wed, 24 Oct 2001, Ming-Lun Tung wrote:
> Help!
>
> I have successfully compiled my "hello world" python script into a java class
>
> The python code goes like this:
>
> print 'Hello World!'
>
> I figured that it will compile through jythonc, and it did, outputting a hello.class file.

You should also have a hello$_PyInner.class. Both are required to run.

> Then I typed "java hello" and I got a
> "Exception in thread "main" java.lang.NullPointerException"
>
> My command line for java is "java -classpath .;c:\jython-2.1a3 hello.class"

Make sure that the jython.jar file is in the classpath, and don't use the
".class" extension when invoking the class with java.  e.g.:

"java -classpath .;c:\jython-2.1a3\jython.jar hello"

> Am I doing something wrong?

See command-line tweak above.

> I thought it will just output "hello world" from the prompt.

It will.


-robert