Issue2101

First the sample code (ugly formatting for brevity):

class A(object):
    def method(self): pass

class B(A):
    __slots__ = ('b')
    def method(self):
        sys.stdout.write('B.method begin\n')
        super(B, self).method()
        self.b = 'b'

class C(A):
    def method(self):
        sys.stdout.write('C.method begin\n')
        super(C, self).method()
        self.c = 'c'

class D1(B, C):
    def method(self): super(D1, self).method()

class D2(C, B):
    def method(self): super(D2, self).method()

D1().method()
D2().method()

This works as expected in python. Output is the following:
B.method begin
C.method begin
C.method begin
B.method begin

On jython I get an exception when assigning to self.b under D2.method:
B.method begin
C.method begin
C.method begin
B.method begin
Traceback (most recent call last):
  File "jymulti.py", line 28, in <module>
    D2().method()
  File "jymulti.py", line 25, in method
    def method(self): super(D2, self).method()
  File "jymulti.py", line 18, in method
    super(C, self).method()
  File "jymulti.py", line 13, in method
    self.b = 'b'
java.lang.ArrayIndexOutOfBoundsException: 0

#1996 likely same bug.

Straightforward test for a complex problem

Need to investigate for beta 4

Related to #1996

Fixed as of https://hg.python.org/jython/rev/4884658aa644.