[e-lang] Embed E in Java

[Kevin Reid]

On Oct 21, 2009, at 13:25, Mark Miller wrote:
> On Tue, Oct 20, 2009 at 9:17 AM, Kevin Reid <kpreid at mac.com> wrote:
>> MarkM: Is there a non-historical reason NestedException/
>> NestedThrowable/etc exist instead of using the Java 1.4
>> Throwable.getCause() mechanism?
>
> Mostly history. The NestedException,.. mechanism predates Java 1.4.
> Since it worked, I have never examined the new getCause() API. I do
> not know whether or not it would be safe to use instead.

[rest of thread omitted]

Here's my draft patch for this. Please review.

It makes the following changes:

* NestedException and NestedIOException now use the Throwable cause  
field to store the provided exception. (The constructor parameter  
order is backwards from the Java conventional one, but I decided not  
to make the effort to change that.)

* Deleted NestedError, as that class was not used.

* Renamed Nested* to EBacktrace*, reflecting the primary use of these  
classes since 'nesting' is now in general possible with plain Java  
throwables. (I'm not sure this is a good idea.)

* Enabled getCause() and initCause(throwable) in Throwable.safej. (I  
also noticed that printStackTrace() is enabled, but should not be, as  
it carries authority to stderr; I intend to fix this as a separate  
commit.)

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-- 
Kevin Reid                                  <http://switchb.org/kpreid/>