Re: [Jython-users] jython servlet and modules

[Robert W. B. <rb...@di...>]

Hellow Mike,

On Fri, 24 Aug 2001, Krajnak, Mike (MED) wrote:
> Summary:  When I split my classes into multiple
> files the JythonServlet reports a type error and
> can't find the extra classes.
>
> Details:
> I've set up and run the JythonServlet on my Win2K
> box and created some sample servlets.  I'm using
> Jython 2.1a3.
>
> I have jython in D:\opt\jython and my servlet context
> for Tomcat is at D:\dev\jyserv.  The jyserv directory
> looks like this:
>
> \jyserv
>    \WEB-INF
>        \classes
>        \lib
>             jython.jar
>        \jython
>    \sample
>         test1.py
>
> And test1.py is:
>
> --- jyserv/sample/test1.py:
> import sys
> from javax.servlet.http import HttpServlet
>
> class message:
>     def __init__(self, pMsg):
>         self.msg = pMsg
>
>     def getMessage(self):
>         return self.msg
>
> class test1(HttpServlet):
>     def doGet(self, request, response):
>         response.setContentType("text/html")
>         out = response.getOutputStream()
>
>         self.mesg = message("Hi Bob!")
>         out.println(self.mesg.getMessage())
>
>         out.close()
>         return
> ---eof
>
> Running jython servlet in Tomcat and going to
> http://localhost:8080/jyserv/sample/test1.py
>
> Displays the "Hi Bob!" message as expected.  If I
> split the files into two like so:
>
> --- jyserv\sample\message.py:
> class message:
>     def __init__(self, pMsg):
>         self.msg = pMsg
>
>     def getMessage(self):
>         return self.msg
> ---eof
>
> --- jyserv\sample\test1.py:
> import sys
> from javax.servlet.http import HttpServlet
>
> class test1(HttpServlet):
>     def doGet(self, request, response):
>         response.setContentType("text/html")
>         out = response.getOutputStream()
>
>         self.mesg = message("Hi Bob!")
>         out.println(self.mesg.getMessage())
>
>         out.close()
>         return
> ---eof
>
> And after restarting Tomcat I get a type error:
>
> Traceback (innermost last):
>   File "D:\dev\jythonservlet\worklist\test.py", line 9, in doGet
> TypeError: call of non-function (module 'message')
>
> I've tried various forms of import and from.  I've inspected
> python path to make sure \dev\jyserv was in the path.  I'm fairly
> new to Python.  Has anyone else had this problem?  Why can't I
> split up my classes into different files?

The import statement that imports "message" is missing from the test1.py
example, so I cannot say for sure, but this usually happens when Java
habits mix up Jython imports :) in other words, the
difference between jython's package/module/class hierarchy as opposed to
Java's package/class.

If you used "import message" rather than "from message import message",
you are calling the module when you do "self.mesg=message("Hi Bob!")".
However, Jython doesn't let you call a module- thus the TypeError: call of
non-function (module 'message').

Remember, your message class is in the message module, so references must
be either:

import message
self.message = message.message("Hi Bob!")   # BTW, Hi!

OR

from message import message
self.message = message("Hi Bob!")


cheers,
Robert