Re: [Jython-users] class conflict

[Chris G. <cg...@gc...>]

Hi Brian,

Thanks for your response.  Yes, this is the exact behavior that I'm 
seeing...  Your work-around that you provided in  your previous message 
works great, but I'd also be interested in knowing why it does not 
produce the expected results.

Chris

Brian Zhou wrote:
> Hi Chris,
> 
> I can reliably reproduce the problem.
> 
> $ lynx -dump http://localhost:8080/ctx/helloA.py
>    from pkgA import Foo; Foo() => pkgA.Foo()
>    pkgA.Foo() => pkgA.Foo()
> $ lynx -dump http://localhost:8080/ctx/helloB.py
>    from pkgB import Foo; Foo() => pkgB.Foo()
>    pkgB.Foo() => pkgB.Foo()
> $ lynx -dump http://localhost:8080/ctx/helloA.py
>    from pkgA import Foo; Foo() => pkgB.Foo()
>    pkgA.Foo() => pkgA.Foo()
> 
> The third request shows the problem, while pkgA.Foo() and pkgB.Foo() works
> fine.
> 
> I guess different servlet URLs share the same PyServlet instance, thus the
> same PythonInterpreter instance. JSP does not have this problem because it
> does not have separate python name space.
> 
> But even with the workaround, it still puzzles me, as the following is the
> expected result.
> 
> Jython 2.1a3 on java1.4.0-beta2 (JIT: null)
> Type "copyright", "credits" or "license" for more information.
> 
>>>>from pkgA import Foo
>>>>Foo()
>>>>
> pkgA.Foo()
> 
>>>>from pkgB import Foo
>>>>Foo()
>>>>
> pkgB.Foo()
> 
>>>>from pkgA import Foo
>>>>Foo()
>>>>
> pkgA.Foo()
> 
> -Brian
> 
> ----- Original Message -----
> From: "Chris Gokey" <cg...@gc...>
> To: <jyt...@li...>
> Cc: "Dave Kendig" <dk...@gc...>
> Sent: Friday, October 05, 2001 9:02 AM
> Subject: [Jython-users] class conflict
> 
> 
> 
>>Hi everyone,
>>
>>I'm seeing some strange behavior when running jython servlets from
>>Tomcat 4.  Not sure where the source of the error is but I'll try to
>>explain.
>>
>>I have 2 classes and they both have the same name but our in different
>>packages, ie., something like this:
>>
>>pkgA.Foo
>>pkgB.Foo
>>
>>These two classes are different implementation-wise, but they both have
>>the same name.
>>
>>The code I have very explicity refers to pkgA.Foo:
>>
>>from pkgA import Foo
>>f = Foo()
>>
>>but for some reaon it is using pkgB.Foo.
>>
>>Now, since this is all loaded under the Tomcat virtual machine, it it
>>possible that pkgA.Foo did get loaded into memory, so somehow maybe it
>>overwrote the pkgB.Foo when it was loaded by another application?
>>
>>I noticed this behavior because I was getting all kinds of errors when
>>the application was loading and executing the wrong Foo.  Then when I
>>restarted the Tomcat server everything worked fine.
>>
>>I'm wondering is it possible to explicitly use a class from a particular
>>package like this:
>>
>>str = java.lang.String()
>>
>>This can be done in Java, can this be done in python?
>>
>>Hopefully this makes some sense to someone :)
>>
>>Chris
>>
>>
>>
>>--
>>  __________________________________________________
>>/\
>>
>>           \
>>\_| Christopher D. Gokey, SSAI, NASA/GCMD          |
>>   | 18 Martin Road, Shelburne Falls, MA  01370     |
>>   | Phone: Voice (413) 625-8129 / FAX 208-248-9055 |
>>   | cg...@gc... / http://gcmd.nasa.gov    |
>>   | ICQ #52132386, AOL IM: chrisgokey              |
>>   |   _____________________________________________|_
>>    \_/______________________________________________/
>>
>>
>>_______________________________________________
>>Jython-users mailing list
>>Jyt...@li...
>>https://lists.sourceforge.net/lists/listinfo/jython-users
>>
>>



-- 
  __________________________________________________
/\ 
			 
	           \
\_| Christopher D. Gokey, SSAI, NASA/GCMD          |
   | 18 Martin Road, Shelburne Falls, MA  01370     |
   | Phone: Voice (413) 625-8129 / FAX 208-248-9055 |
   | cg...@gc... / http://gcmd.nasa.gov    |
   | ICQ #52132386, AOL IM: chrisgokey              |
   |   _____________________________________________|_
    \_/______________________________________________/