<Beans Dev> XMLEncoder regression in OpenJDK

[Matthew Hall]

This bug was reported against and fixed in Sun JDK 6. See
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6852574 for background.

EnumPersistenceDelegate has a regression present in all versions of
OpenJDK, whereby any enum with custom methods (anonymous inner classes)
will fail to encode.

Example:

  class Foo {
    A(),
    B() {
      String bar() { return "aaa"; }
    }

    Foo() {}

    String bar() { return "x"; }
  }

For the value Foo.B, EnumPersistenceDelegate creates the expression
Enum.valueOf(e.getClass(), e.name()). However e.getClass() resolves not to
class Foo, but to anonymous inner class Foo$1.

When the expression is evaluated (prior to encoding),
Enum.valueOf(Foo$1.class, 'B') returns null since Foo$1 isn't considered an
enum class. Thus the original and encoded values do not match up, and
encoding fails.

EnumPersistenceDelegate should be patched to create the expression
Enum.valueOf(e.get*Declaring*Class(), e.name()) instead.

-Matthew
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