diff --git a/_py/code/assertion.py b/_py/code/assertion.py
index 4d53d59e4..32a150d91 100644
--- a/_py/code/assertion.py
+++ b/_py/code/assertion.py
@@ -37,7 +37,7 @@ def _format_explanation(explanation):
     return '\n'.join(result)
 
 
-if sys.version_info >= (2, 6):
+if sys.version_info >= (2, 6) or (sys.platform.startswith("java")):
     from _py.code._assertionnew import interpret
 else:
     from _py.code._assertionold import interpret
diff --git a/_py/code/code.py b/_py/code/code.py
index 86582909a..f6336be8a 100644
--- a/_py/code/code.py
+++ b/_py/code/code.py
@@ -28,6 +28,9 @@ class Code(object):
             if rec-cursive is true then dive into code 
             objects contained in co_consts. 
         """ 
+        if sys.platform.startswith("java"):
+            # XXX jython does not support the below co_filename hack
+            return self.raw 
         names = [x for x in dir(self.raw) if x[:3] == 'co_']
         for name in kwargs: 
             if name not in names: 
diff --git a/_py/log/warning.py b/_py/log/warning.py
index 6a71b6d5c..3a9a578bf 100644
--- a/_py/log/warning.py
+++ b/_py/log/warning.py
@@ -50,6 +50,8 @@ def warn(msg, stacklevel=1, function=None):
         fnl = filename.lower()
         if fnl.endswith(".pyc") or fnl.endswith(".pyo"):
             filename = filename[:-1]
+        elif fnl.endswith("$py.class"):
+            filename = filename.replace('$py.class', '.py')
     else:
         if module == "__main__":
             try:
diff --git a/_py/test/plugin/pytest_assertion.py b/_py/test/plugin/pytest_assertion.py
index c4e221319..44974d194 100644
--- a/_py/test/plugin/pytest_assertion.py
+++ b/_py/test/plugin/pytest_assertion.py
@@ -8,6 +8,9 @@ def pytest_addoption(parser):
         help="disable python assert expression reinterpretation."),
 
 def pytest_configure(config):
+    if sys.platform.startswith("java"):
+        return # XXX assertions don't work yet with jython 2.5.1
+
     if not config.getvalue("noassert") and not config.getvalue("nomagic"):
         warn_about_missing_assertion()
         config._oldassertion = py.builtin.builtins.AssertionError
diff --git a/testing/code/test_assertion.py b/testing/code/test_assertion.py
index 25b65d0a9..7427df371 100644
--- a/testing/code/test_assertion.py
+++ b/testing/code/test_assertion.py
@@ -1,5 +1,7 @@
 import py
 
+pytestmark = py.test.mark.skipif("sys.platform.startswith('java')")
+
 def exvalue():
     return py.std.sys.exc_info()[1]
 
diff --git a/testing/code/test_code.py b/testing/code/test_code.py
index 872029343..673342513 100644
--- a/testing/code/test_code.py
+++ b/testing/code/test_code.py
@@ -3,6 +3,8 @@ import py
 import sys
 from _py.code.code import safe_repr
 
+failsonjython = py.test.mark.xfail("sys.platform.startswith('java')")
+
 def test_newcode(): 
     source = "i = 3"
     co = compile(source, '', 'exec') 
@@ -16,10 +18,12 @@ def test_ne():
     code2 = py.code.Code(compile('foo = "baz"', '', 'exec'))
     assert code2 != code1
 
+@failsonjython
 def test_newcode_unknown_args(): 
     code = py.code.Code(compile("", '', 'exec'))
     py.test.raises(TypeError, 'code.new(filename="hello")')
 
+@failsonjython
 def test_newcode_withfilename():
     source = py.code.Source("""
         def f():
@@ -44,6 +48,7 @@ def test_newcode_withfilename():
     assert 'f' in names
     assert 'g' in names
 
+@failsonjython
 def test_newcode_with_filename(): 
     source = "i = 3"
     co = compile(source, '', 'exec') 
@@ -58,6 +63,7 @@ def test_newcode_with_filename():
     assert str(s) == source 
 
 
+@failsonjython
 def test_new_code_object_carries_filename_through():
     class mystr(str):
         pass
diff --git a/testing/code/test_excinfo.py b/testing/code/test_excinfo.py
index 8b249d1f5..0c3314a95 100644
--- a/testing/code/test_excinfo.py
+++ b/testing/code/test_excinfo.py
@@ -384,7 +384,7 @@ raise ValueError()
 
     def test_repr_local(self):
         p = FormattedExcinfo(showlocals=True)
-        loc = {'y': 5, 'z': 7, 'x': 3, '__builtins__': __builtins__}
+        loc = {'y': 5, 'z': 7, 'x': 3, '__builtins__': {}} # __builtins__}
         reprlocals = p.repr_locals(loc) 
         assert reprlocals.lines 
         assert reprlocals.lines[0] == '__builtins__ = <builtins>'
diff --git a/testing/path/common.py b/testing/path/common.py
index faf549887..2ac18ffd9 100644
--- a/testing/path/common.py
+++ b/testing/path/common.py
@@ -132,6 +132,7 @@ class CommonFSTests(object):
         assert not l1.relto(l2)
         assert not l2.relto(l1)
 
+    @py.test.mark.xfail("sys.platform.startswith('java')")
     def test_listdir(self, path1):
         l = path1.listdir()
         assert path1.join('sampledir') in l
@@ -177,6 +178,7 @@ class CommonFSTests(object):
         assert "sampledir" in l
         assert "otherdir" in l
 
+    @py.test.mark.xfail("sys.platform.startswith('java')")
     def test_visit_ignore(self, path1):
         p = path1.join('nonexisting')
         assert list(p.visit(ignore=py.error.ENOENT)) == []
diff --git a/testing/path/test_local.py b/testing/path/test_local.py
index 727eae911..773fdf3d2 100644
--- a/testing/path/test_local.py
+++ b/testing/path/test_local.py
@@ -3,6 +3,8 @@ import sys
 from py.path import local
 from testing.path import common
 
+failsonjython = py.test.mark.xfail("sys.platform.startswith('java')")
+
 def pytest_funcarg__path1(request):
     def setup():
         path1 = request.config.mktemp("path1")
@@ -545,11 +547,13 @@ class TestPOSIXLocalPath:
             for x,y in oldmodes.items():
                 x.chmod(y)
 
+    @failsonjython
     def test_chown_identity(self, path1):
         owner = path1.stat().owner
         group = path1.stat().group
         path1.chown(owner, group)
 
+    @failsonjython
     def test_chown_dangling_link(self, path1):
         owner = path1.stat().owner
         group = path1.stat().group
@@ -560,6 +564,7 @@ class TestPOSIXLocalPath:
         finally:
             x.remove(rec=0)
 
+    @failsonjython
     def test_chown_identity_rec_mayfail(self, path1):
         owner = path1.stat().owner
         group = path1.stat().group
diff --git a/testing/pytest/plugin/test_pytest_capture.py b/testing/pytest/plugin/test_pytest_capture.py
index 08e342ec6..8af1867f2 100644
--- a/testing/pytest/plugin/test_pytest_capture.py
+++ b/testing/pytest/plugin/test_pytest_capture.py
@@ -1,12 +1,14 @@
 import py, os, sys
 from _py.test.plugin.pytest_capture import CaptureManager
 
+needsosdup = py.test.mark.xfail("not hasattr(os, 'dup')")
+
 class TestCaptureManager:
     def test_getmethod_default_no_fd(self, testdir, monkeypatch):
         config = testdir.parseconfig(testdir.tmpdir)
         assert config.getvalue("capture") is None
         capman = CaptureManager()
-        monkeypatch.delattr(os, 'dup')
+        monkeypatch.delattr(os, 'dup', raising=False)
         try:
             assert capman._getmethod(config, None) == "sys" 
         finally:
@@ -16,14 +18,21 @@ class TestCaptureManager:
         config = testdir.parseconfig(testdir.tmpdir)
         assert config.getvalue("capture") is None
         capman = CaptureManager()
-        assert capman._getmethod(config, None) == "fd" # default
+        hasfd = hasattr(os, 'dup')
+        if hasfd:
+            assert capman._getmethod(config, None) == "fd" 
+        else:
+            assert capman._getmethod(config, None) == "sys" 
 
         for name in ('no', 'fd', 'sys'):
+            if not hasfd and name == 'fd':
+                continue
             sub = testdir.tmpdir.mkdir("dir" + name)
             sub.ensure("__init__.py")
             sub.join("conftest.py").write('option_capture = %r' % name)
             assert capman._getmethod(config, sub.join("test_hello.py")) == name
 
+    @needsosdup
     @py.test.mark.multi(method=['no', 'fd', 'sys'])
     def test_capturing_basic_api(self, method):
         capouter = py.io.StdCaptureFD()
@@ -43,6 +52,7 @@ class TestCaptureManager:
         finally:
             capouter.reset()
       
+    @needsosdup
     def test_juggle_capturings(self, testdir):
         capouter = py.io.StdCaptureFD()
         try:
@@ -242,10 +252,13 @@ class TestLoggingInteraction:
         # here we check a fundamental feature 
         rootdir = str(py.path.local(py.__file__).dirpath().dirpath())
         p = testdir.makepyfile("""
-            import sys
+            import sys, os
             sys.path.insert(0, %r)
             import py, logging
-            cap = py.io.StdCaptureFD(out=False, in_=False)
+            if hasattr(os, 'dup'):
+                cap = py.io.StdCaptureFD(out=False, in_=False)
+            else:
+                cap = py.io.StdCapture(out=False, in_=False)
             logging.warn("hello1")
             outerr = cap.suspend()
 
@@ -328,7 +341,8 @@ class TestCaptureFuncarg:
                 assert out.startswith("42")
         """)
         reprec.assertoutcome(passed=1)
-        
+       
+    @needsosdup 
     def test_stdfd_functional(self, testdir):        
         reprec = testdir.inline_runsource("""
             def test_hello(capfd):
@@ -351,6 +365,7 @@ class TestCaptureFuncarg:
             "*1 error*",
         ])
 
+    @needsosdup
     def test_keyboardinterrupt_disables_capturing(self, testdir):        
         p = testdir.makepyfile("""
             def test_hello(capfd):
diff --git a/testing/pytest/test_collect.py b/testing/pytest/test_collect.py
index e649e6013..e4b44fedb 100644
--- a/testing/pytest/test_collect.py
+++ b/testing/pytest/test_collect.py
@@ -189,7 +189,7 @@ class TestPrunetraceback:
         assert "__import__" not in result.stdout.str(), "too long traceback"
         result.stdout.fnmatch_lines([
             "*ERROR during collection*",
-            ">*import not_exists*"
+            "*mport*not_exists*"
         ])
 
 class TestCustomConftests: