Fixed #20016: worked around Jython not having a buffer.

    _assertRaisesRegex = "assertRaisesRegexp"

    _assertRegex = "assertRegexpMatches"

    # memoryview and buffer are not stricly equivalent, but should be fine for

    # django core usage (mainly BinaryField)

    # django core usage (mainly BinaryField). However, Jython doesn't support

    # buffer (see http://bugs.jython.org/issue1521), so we have to be careful.

    if sys.platform.startswith('java'):

        memoryview = memoryview

    else:

        memoryview = buffer