Re [Jython-users] jreload issue

[Samuele P. <ped...@bl...>]

Hi.

> Shouldn't the following be equivalent?  I can't seem to get the jreload
> version to work.

No they are not equivalent. So the error you get is not a bug,
although I see what you want to achieve so see below.

> start jython with some.jar in cp, then:
>
> from org import somepackage

if I do:

import org
org2 = org
from org2 import somepackage

it fails, same story below.

> OR start jython with no classpath:
>
> import jreload
> ls = jreload.makeLoadSet('myls', ["/path/to/some.jar"])
> from myls import org
> from org import somepackage
> ImportError: cannot import name somepackage

from p.k.g import something

p.k.g referes to the packages namespace, nothing to do
with the current local/global scope.

from myls.org import somepackage works but - I know -
is not what you want.

If you know a point in the package hierarchy in your jar
that is disjunct from the hiearchy on classpath and sys.path
(NB typically org is not such a point <wink>), e.g.
org.iMnotToBeFoundAlongClassPathAndSysPath
org.empire.iMjustInTheJar

you can do the following:

import sys
import jreload
ls = jreload.makeLoadSet('someJarLS', ["/path/to/some.jar"])
sys.modules['org.iMnotToBeFoundAlongClassPathAndSysPath']=ls.org.iMnotToBeFound
AlongClassPathAndSysPath
sys.modules['org.empire.iMjustInTheJar']=ls.org.empire.iMjustInTheJar

then

from org.empire.iMjustInTheJar import somepackage
from org.iMnotToBeFoundAlongClassPathAndSysPath import somepackage

will work but

from org import iMnotToBeFoundAlongClassPathAndSysPath

will not.

Btw if you play the trick with a point not disjunct, you will get some major
troubles.
[Yup it is a hack, but the limitations of jreload come from the fact that it
allows
reloading, sys.path and classpath don't.]

regards, Samuele Pedroni.