Merge pkg_resources workaround

Merge branch 'pkg_resources_bugfix' of github.com:raquel-ucl/pytest into pkg-resources

This is an odd case and doesn't really make sense, it is working around a bug
in maven/jython and the old version or weird packaging of setuptools they use.
But we used to do this in the past so might as well keep doing this.

AUTHORS

@@ -106,6 +106,7 @@ Punyashloka Biswal
 Quentin Pradet
 Ralf Schmitt
 Raphael Pierzina
+Raquel Alegre
 Roberto Polli
 Romain Dorgueil
 Roman Bolshakov

CHANGELOG.rst

@@ -5,13 +5,12 @@
   in Python 2 (`#1905`_).
   Thanks `@philpep`_ for the report and `@nicoddemus`_ for the PR.
 
-*
-
 * Assertions are now being rewritten for plugins in development mode
   (``pip install -e``) (`#1934`_).
   Thanks `@nicoddemus`_ for the PR.
 
-*
+* Fix pkg_resources import error in Jython projects (`#1853`).
+  Thanks `@raquel-ucl`_ for the PR.
 
 *
 

_pytest/config.py

@@ -5,7 +5,6 @@
 import types
 import warnings
 
-import pkg_resources
 import py
 # DON't import pytest here because it causes import cycle troubles
 import sys, os
@@ -952,6 +951,7 @@ def _consider_importhook(self, args, entrypoint_name):
             except SystemError:
                 mode = 'plain'
             else:
+                import pkg_resources
                 self.pluginmanager.rewrite_hook = hook
                 for entrypoint in pkg_resources.iter_entry_points('pytest11'):
                     # 'RECORD' available for plugins installed normally (pip install)