Issue2259

This problem is absent without "from __future__ import absolute_import".

$ cd /tmp
$ mkdir test
$ touch test/__init__.py
$ echo $'from __future__ import absolute_import\nfrom . import *' > test/x.py
$ echo $'from __future__ import absolute_import\nfrom .z import *' > test/y.py
$ touch test/z.py
$ tree test
test
├── __init__.py
├── x.py
├── y.py
└── z.py

0 directories, 4 files
$ cat test/x.py
from __future__ import absolute_import
from . import *
$ cat test/y.py
from __future__ import absolute_import
from .z import *
$ python2.7 -c 'import test.x'
$ python2.7 -c 'import test.y'
$ jython2.7 -c 'import test.x'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "test/x.py", line 2, in <module>
    from . import *
ValueError: Empty module name
$ jython2.7 -c 'import test.y'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "test/y.py", line 2, in <module>
    from .z import *
ImportError: No module named z
$

Turns out to be a duplicate of #2158, currently fixed on my local repo:

> type test\x.py
from __future__ import absolute_import
from . import *
> type test\y.py
from __future__ import absolute_import
from .z import *
> type test\z.py
#
> type test\__init__.py
#
> %jt%\dist\bin\jython -c"import test.x"

> %jt%\dist\bin\jython -c"import test.y"

>

Fixed at: https://hg.python.org/jython/rev/9483b3252bd5