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From: Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid>
Newsgroups: comp.lang.java.programmer
Subject: Re: What's wrong with this Java Jython call?
Date: Sun, 14 Jun 2020 16:23:40 +0200
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On 2020-06-13 13:15, vjp2.at@at.BioStrategist.dot.dot.com wrote:
> First, many thanks.
> 
> Here's where I am.
> 1. Is the ";jython" correct?
> 2. I added -jar to run jython alone
> 3. the "wrappers" are files with extension .i
> 4. I posted a question on the RDKIT sourceforce list, no reply
> 5. Yes, I removed the script, but how do I use it to init then return to
>       prompt? TEE? |?
> 
> Thanks again
> 
> @echo off
> SET RD_HOME=.
> SET JAVA_HOME=..\CommonFiles\JAVA
> SET JAVA_COMMAND=%JAVA_HOME%\bin\java.exe
> SET LOCAL_CLASSPATH=%RD_HOME%\org.RDKit.jar
> "%JAVA_COMMAND%" -classpath "%LOCAL_CLASSPATH%"  -jar "%JAVA_HOME%"\jython-standalone-2.5.jar; jython -Djava.library.path="%RD_HOME%"\rdkit-master\Code\JavaWrappers\gmwrapper  
> rem if remove semicolon complains jython not found in rdkit - of course it's in common
> rem able to run jython as jar run print "hello" or print 3+4
> rem some docs have rdkit.jar in gmwrapper; what are dlls but no exe doing here?
> pause
> rem < "%RD_HOME%"\start.rdk 
> rem how can I run this and return to prompt?
> :END
> 
> rem these are in start.rdk
> rem from org.RDKit import *
> rem from java import lang
> rem lang.System.loadLibrary('GraphMolWrap')
> rem m = RWMol.MolFromSmiles('c1ccccc1')
> rem m.getNumAtoms()
> 6L

> if remove semicolon complains jython not found in rdkit - of course
it's in common

This is weird.
What happens if you just run `jython` on the command line? From what I
could see the default jython install puts it on the $PATH. IOW what
happens if you remove everything from your line up to and including the
semicolon?

> how can I run this and return to prompt?

What is the problem exactly?

Is the script launching a background process that you wish to keep
alive, equivalent to running in background on Unix?

Or is the script supposed to return a value, but for some reason it's
not exiting properly and you would like it to exit properly?

If the latter, try adding a `sys.exit` at the end of your python code.
Maybe the loadLibrary call or something else that library does is
keeping the JVM alive.

-- 
DF.