James, The reason you can't use "Python" is because the scripting bundle only works with JVM-based scripting languages like JRuby, Jython and Groovy. Java 6 introduced javax.script which is a package that adds a standard API for calling JVM scripting languages from a Java app.
>From from overcomplicating it, this is what simplifies the support for multiple scripting languages without getting into solutions like Py4j or doing weird things with inter-process communication like the Python API for Storm. On Sun, Apr 15, 2018 at 8:35 AM James McMahon <jsmcmah...@gmail.com> wrote: > I'm not sure I understand. The ExecuteScript processor forces me into a > Jython environment - despite selecting Python as the scripting language in > the processor configuration. I'll never understand why that route was opted > for in the first place. Why overcomplicate this, introducing yet another > dependency (on Jython)? Let the selection of python as the script language > use the installed python on my server, and decouple me from any Jython > dependencies. It's been nothing but trouble. Python code that works just > fine from the command line fails for all manner of issues with Jython when > I call it from ExecuteScript. > > I gather you've called Flask-driven python microservices from NiFi. What > NiFi processor allows you to do that? I'll look into Flask-driven > microservices now, and am certainly willing to try this. Thanks very much. > > On Sat, Apr 14, 2018 at 12:25 PM, Mike Thomsen <mikerthom...@gmail.com> > wrote: > >> From a lot of your posts, it seems like you're running into the same sort >> of problem that some of my colleagues ran into with Jython. The fact is >> that Jython is just not well supported by the Python community, and it's >> going to keep getting worse as Python 2.X EOL deadline in 2020 (IIRC) gets >> closer. As a Python developer, I think you might find it a lot easier to >> switch to Python 3 for your code and turn these scripts into Flask-driven >> microservices that are called by NiFi. >> >> Mike >> >> On Fri, Apr 13, 2018 at 5:47 PM James McMahon <jsmcmah...@gmail.com> >> wrote: >> >>> No sir. When I run from the command line - I encapsulate script-specific >>> command sequences in code triggered by SCRIPT var value, and NiFi >>> sequences encapsulated within NIFI var values - it runs in a Python >>> environment. I attempted jython -V at the command line, and it was unable >>> to find an installation of jython independent of that which comes embedded >>> in NiFi 0.7.1.c. >>> >>> Assuming that I am operating in a Jython 2.7.0 environment when in NiFi, >>> are there specific libraries or packages I should import to get it to >>> recognize what seem to be very fundamental os package commands? Is it >>> possible to override the use of the jython packages that I suspect are >>> missing, and force it to use the python packages that I know are there? >>> >>> If I must abandon os.statvfs to get this to work in NiFi, have you seen >>> anyone harvest disk usage information from any native NiFi processors? My >>> thinking is this: if I can't climb the Jython mountain, maybe I can precede >>> my ExecuteScript processor with something that does this check in advance. >>> I would then rip these calls out of my python script (NIFI sections). >>> >>> Jim >>> >>> On Fri, Apr 13, 2018 at 2:59 PM, Joe Witt <joe.w...@gmail.com> wrote: >>> >>>> Independent of NiFi have you successfully used any version of Jython >>>> to make that call? >>>> >>>> With the NiFi 1.x line that processor has been updated a little bit >>>> and in particular i think we have Jython 2.7.1 (off memory so could be >>>> totally nonsense) where as before we had 2.7.0 or something older... >>>> >>>> Thanks >>>> >>>> On Fri, Apr 13, 2018 at 6:37 PM, James McMahon <jsmcmah...@gmail.com> >>>> wrote: >>>> > Good afternoon. I am running a python script from an ExecuteScript >>>> processor >>>> > in NiFi 0.7.1.c. I'm assuming this is actually running in a Jython >>>> > environment under the hood of the processor. >>>> > >>>> > General question: How can I tell what version of Jython i am >>>> employing? >>>> > >>>> > Specific problem: I employ an os.statvfs call to check available >>>> capacity on >>>> > my disk devices that host my content repo, and that host my data >>>> landing >>>> > zone. In my command line environment - not jython - Python has this >>>> library >>>> > and so I can successfully make this call. >>>> > >>>> > In NiFi, I get this error at run time: >>>> > >>>> > javax.script.ScriptException: AttributeError: 'module' object has no >>>> > attribute ;statvfs' >>>> > >>>> > How can I correct this? I am happy to replace it if necessary with >>>> something >>>> > Jython provides, but don't fully understand the Jython environment >>>> within >>>> > NiFi. Is there a suitable Jython equivalent to fix this problem? What >>>> > package or module must i include in my script to get at that? >>>> > >>>> > Thanks in advance for your help. >>>> > >>>> > Jim >>>> >>> >
