Re: [Jython-users] how to run jython coverage with an explicit java.exe?

[Jeff A. <ja...@fa...>]

Hi Hartmut. Thanks for experimenting with solutions.

I've never used coverage myself, but when I run jython (on Windows) it 
picks up the JVM on my path.

I do not understand why, in your account of the error, 
coverage-script.py is in the Jython bin directory. I would expect that 
to be in site-packages, or somewhere of its own, and the paths to 
modules it needs would then be on the sys.path. The error about not 
being able to find a module does not scream "wrong JVM" to me.

pkg_resources is in site-packages, as part of the pip installation we 
do. However, pip as a whole is broken for all versions of Jython thanks 
to changes at pypi.org and our slowness to adapt. pkg_resources is not 
necessarily affected.

Running the jython.jar directly may not work well because additional 
JARs you may need are precluded by the -jar option. The jython.exe 
launcher has a --print command that tells you what it would have done, 
which is useful when you need to roll your own command line. --help will 
tell you which environment variables it pays attention to in creating 
that command.

-- 

Jeff Allen

On 15/02/2022 10:33, Niemann, Hartmut wrote:
>
> Hi!
>
> I need to specify which java is used for a coverage run.
>
> I am using Jython 2.7.0 and coverage 3.4.3
>
> I used to use “coverage.exe” but how could I tell it which java to start?
>
> I succeded starting “jython.exe  coverage-script.py” , but same 
> problem: which java VM is used?
>
> I can run Jython with an explicit JAVA executable and some simple example
>
> %JAVA64% -jar "somepath\jython.jar" %JYTHON_DIR%\bin\hello.py
>
> But when I combine these to
>
> %JAVA64% -jar "C:\SIBAS32\JAVA_LIBS\jython\jython.jar" 
> %JYTHON_DIR%\bin\coverage-script.py
>
> I get
>
> Traceback (most recent call last):
>
>   File "C:\DEVTOOLS\Jython\2.7.0\bin\coverage-script.py", line 5, in 
> <module>
>
>     from pkg_resources import load_entry_point
>
> ImportError: No module named pkg_resources
>
> So I would need to convince coverage.exe or jython.exe to use the 
> Java.exe I want, or teach java.exe -jar … coverage-script.py where to 
> look for the pkg_resources directory.
>
> On
>
> https://www.jython.org/jython-old-sites/archive/21/docs/interpreter.html
>
> I found the sentence
>
> “jythonis a short script that invokes your local JVM, [..]”
>
> which unfortunately does not tell me how the JVM is selected from the 
> (four?) JVMs I have installed.
>
> What would you recommend?
>
> Regards
>
> Hartmut
>
>