Issue2509

Traceback (innermost last): File "<string>", line 1, in ? File "C:\jython2.7.0\Lib\modjy\modjy.py", line 30, in ? File "C:\jython2.7.0\Lib\modjy\modjy_exceptions.py", line 23, in ? SyntaxError: ('invalid syntax', ('C:\\jython2.7.0\\Lib\\traceback.py', 194, 58, " caretspace = ((c.isspace() and c or ' ') for c in caretspace)")) :org.python.core.PySyntaxError:null

This looks like an issue with the traceback module (The error is reported when modjy tries to import the traceback module, on line 23 of modjy_exceptions.py).

The following line of traceback.py, which contains a generator comprehension, is choking the parser somehow.

Traceback.py, line 194
caretspace = ((c.isspace() and c or ' ') for c in caretspace)

The indicated position of the error is character 598, just before the 'for'.

Until this is resolved, a simple workaround is to comment out the usage of the traceback module in modjy_exceptions.py. It is only ever used for debugging anyway.

Comment out the "import traceback" statement on line 23

https://hg.python.org/jython/file/tip/Lib/modjy/modjy_exceptions.py#l23

and comment out the for loop that refers to it, on line 73 and 74.

https://hg.python.org/jython/file/tip/Lib/modjy/modjy_exceptions.py#l73

That should get it working again.

Lastly, I note that you are experiencing this error with jython 2.7.0, which is quite old at this stage: jython is now at version 2.7.1.

Dozens of bugs have been fixed since jython 2.7.0

https://hg.python.org/jython/file/tip/NEWS

If you try with the latest jython 2.7.1, the problem will quite likely have been solved.

Thx for reply,

According to my investigation, it is found that the jython version, which weblogic12c includes, is 2.21........much older than 2.7.

After comment that line of codes, further syntax error occurs elsewhere. Further check will be carried on after I have done this on Monday.

Ref link.
https://technology.amis.nl/2015/10/04/how-to-use-wlst-as-a-jython-2-7-module/

Thank you very much.

Did you get this problem resolved?

Is there some way you can bypass the embedded jython 2.2 interpreter, and make weblogic use jython 2.7 for the web app?

Searching for a few days, I still cannot figure out how to change the default JYTHON_HOME/PYTHON_HOME location. May be it is difficult to do so since the command line interface of Weblogic is written in JYTHON, and the jython core is located in some Library of weblogic.

I have also take a look in the startup script of Weblogic, but still have no solution. 

The best solution I think is let Oracle upgrade their own product library, if it is not able to change the JYTHON_HOME by the user

These web logic links discuss using a modern version of jython with weblogic.

http://stackoverflow.com/questions/11881659/wlst-vs-jython-weblogic-10-3-3

https://technology.amis.nl/2015/10/04/how-to-use-wlst-as-a-jython-2-7-module/