https://github.com/beachmachine/django/commit/1c6104cb8f395bfa344da035b5b78c30a6037a9d

django_basepy_getcallargs.patch

--- base.py	2014-09-06 22:50:21.391493603 +0100
+++ base_getcallargs_patched.py	2014-09-06 22:49:47.043494548 +0100
@@ -1,9 +1,10 @@
 from __future__ import unicode_literals
 
 import re
+import sys
 from functools import partial
 from importlib import import_module
-from inspect import getargspec, getcallargs
+from inspect import getargspec
 
 from django.apps import apps
 from django.conf import settings
@@ -788,6 +789,10 @@
                             current = current()
                         except TypeError:
                             try:
+                                # `getcallargs` not available on Jython
+                                if sys.platform.startswith('java'):
+                                    raise
+                                from inspect import getcallargs
                                 getcallargs(current)
                             except TypeError:  # arguments *were* required
                                 current = settings.TEMPLATE_STRING_IF_INVALID  # invalid method call