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[5:38] <agronholm> I have a big problem. I found I can no longer deploy my Jython app via Java Web Start. This is because sys.prefix is None and so sysconfig.py crashes when it tries to normalize the sys.prefix. What can I do?
[5:38] <agronholm> I was supposed to deploy this app yesterday.
[5:51] <agronholm> I do PySystemState.initialize() and then new PythonInterpreter() and there it crashes
[5:57] <agronholm> the exact same kind of initialization worked with 2.5.x
[5:59] <agronholm> also, if I use an umodified standalone jar, it will raise ImportError: No module named site
[5:59] <agronholm> apparently it can't find the modules in Lib/
[6:02] <paolo> did this kind of deploy work in the past?
[6:02] <agronholm> yes, for many years
[6:02] <paolo> oh sorry missed that you also wrote that
[6:02] <agronholm> it stopped working once I switched to Jython 2.7
[6:03] <agronholm> also for some incomprehensible reason, ant also stopped working but I could work around that
[6:03] <agronholm> it stopped working on all my machines X_X
[6:03] <agronholm> it couldn't find a clbuild.xml:35: taskdef A class needed by class org.python.util.JycompileAntTask cannot be found: org/python/apache/tools/ant/taskdefs/MatchingTask
[6:03] <agronholm> using the classloader AntClassLoader[/home/etikettu/jython2.7/jython.jar]
[6:03] <agronholm> oops
[6:04] <agronholm> anyway it couldn't find a class that was clearly on the class path
[6:04] <agronholm> and this had worked just fine until I upgraded to openjdk 7
[6:05] <paolo> ant stopped working doing what? while compiling jython from source?
[6:05] <agronholm> no, it wouldn't run JycompileAntTask anymore
[6:05] <agronholm> which is the ant equivalent of jython -m compileall
[6:06] <agronholm> I'm going to bed now. If anyone has any ideas how to fix this, please let me know.
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[9:07] <paolo> agronholm: i found this, "The quickest way to solve this problem (sys.prefix which is None) is to set a value for the python.home property in the web.xml for your modjy application."
[9:08] <paolo> your app is not on modjy, but you should have a web.xml anyway
[9:09] <paolo> and with a bit of luck maybe it can work for your case, too.
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[13:57] <agronholm> paolo: thanks. I'll see if setting python.home will do anything.
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[15:06] <jimbaker> agronholm, paolo - thanks for digging into this re sys.prefix
[15:06] <jimbaker> agronholm, i also need to follow up on html5lib-python
[15:07] <agronholm> it just seemed odd to me that it worked in development, and running the standalone jar works fine but for some reason it doesn't work with JWS
[15:07] <agronholm> the only way to make it find the stdlib modules is to move them from Lib/ to the root of the jar
[15:32] <a42niem> hm, I still get an error regarding "duplicate entry: META-INF/BCKEY.DSA" when trying to create 2.7b3 standalone using the installer
[15:36] <agronholm> a42niem: so download the prepackaged one
[15:43] <a42niem> sure, sorry
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[16:24] <jimbaker> a42niem, this is a bug we have, sorry about that - http://bugs.jython.org/issue2196
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[19:11] <agronholm> jimbaker: any idea what might cause the problem with ant?
[19:11] <agronholm> does the jython ant compile task work for you?
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[21:13] <paolo> guys anyone using execnet to call jython from python?
[21:13] <paolo> i'm trying to do that but have some problem
[21:13] <paolo> if anyone can help, here it is https://gist.github.com/paolodina/f2cbf7b1c7cee2756b05
[21:14] <paolo> thanks :)
[21:16] <agronholm> paolo: wouldn't py4j serve that purpose better?
[21:17] <paolo> let's check
[21:19] <paolo> agronholm: does py4j replace jython?
[21:19] <agronholm> paolo: no
[21:19] <paolo> ok, then i have to understand how they work together
[21:19] <agronholm> but I'm using it to interface with java libraries from a cpython app
[21:21] <paolo> i have a webapp in django that could run on cpython, except for a couple of calls to java methods. my idea is to run the app on python (replacing jython) and use some bridge to call java from python
[21:22] <paolo> it makes sense to me
[21:24] <agronholm> sounds like py4j is the thing for you
[21:28] <paolo> but... does py4j handle custom instances derived from custom java types, or just "simple types" like builtins?
[21:29] <paolo> because the java methods return arraylists of that kind of instances
[21:31] <agronholm> paolo: you can set up a callback server and define the implemented interfaces in your class
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[21:32] <paolo> wow.
[21:32] <agronholm> I use py4j with jasperreports which required me to do just that
[21:33] <agronholm> it's pretty easy too
[21:34] <paolo> agronholm: does it perform well, too?
[21:35] <agronholm> well, it's java
[21:35] <agronholm> running in an actual jvm process
[21:35] <paolo> oh right, native
[21:51] <paolo> an update, the docs says that jython performs better than py4j (because the latter relies on sockets)
[21:51] <paolo> http://py4j.sourceforge.net/about.html#alternatives-to-py4j
[21:51] <agronholm> that really depends on your operating model
[21:51] <agronholm> also you get to use cpython 3
[21:52] <agronholm> if you only need one java lib, py4j is the better choice IMO
[21:55] <paolo> the final goal is to interact from python with java classes that use neo4j and spring jars to return a result
[21:56] <paolo> and i'm doing that in python 2.7
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