javac makes String non-backward compatible

See 4810933 for a description of a minor incompatibility introduced
when generics are enabled. The test test/java/lang/String/Exceptions.java
runs afoul of that by virtue of containing the code

   "foo".compareTo((Object) null);

The suggested change is to either (1) force compilation with -source 1.4,
or (2) remove the cast to Object.

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On second thought, the default compiler options include -source 1.4.
This is therefore a compiler bug.

###@###.### 2003-03-10