Issue1271

Given:
- Two Java classes, 'Base' and 'Derived', where 'Derived' extends 'Base'
- Where 'Base' implements the method 'foo()'
- Where 'Derived' implements the method 'getFoo()'

The bean property accessor that is generated for 'Derived.getFoo()'
which allows it to be called by using the expression 'derived.foo'.
Unfortunately, this covers the 'Base.foo()' method, making 'Base.foo()'
unaccessable for instances of 'Derived'.

Please find attached a unit test that will test for this bug.

Please find attached a patch which fixes this issue. The patch affects
the init() method of org.python.core.PyJavaType.

Hi Geoffrey, I finally got a chance to apply and test this, but it
causes test_java_integration.py to fail.  If you can get that working I
could apply this.  I pulled your tests into a (somewhat lame) test for
the tests/ directory.  We don't have a good way to compile Java in the
regrtest, so it's easier (if ugly) to put the tests in a Java unit test.
 I commented them out but checked them in here:

tests/java/org/python/tests/props/PropShadow.java
tests/java/org/python/tests/props/BeanPropertyTest.java

Please find attached a patch which fixes the issue without breaking the
tests you mentioned.

Cause: PyJavaType.init() refusing to overwrite any 'dict' entry with the
same name, with a bean property, that was not already a bean property or
bean event.

The desired behavior (of my original patch) was to prevent methods in
superclasses being overridden, *but*, the behavior that resulted
prevented bean properties from being registered when anything was
registered under that name, including class properties.

The new patch ensures that overriding is only prevented when the
definition being overridden comes from a superclass, by calling
lookup_where() instead of lookup(), and checking that the original
definition is NOT from the current class.

Applied in r6224, thanks!