In short in the asciidoctor-gradle-plugin we serialise closures out because by
default we run asciidoctorj in a separate JVM.Basically you have to dehydrate
the closure before serialisation and then rehydrate it after deserialisation.
This is to set an owner & delegate.Sent from my Samsung device
-------- Original message --------
From: Ralph Johnson <rjohnson.u...@gmail.com>
Date: 31/10/2019 21:30 (GMT+01:00)
To: users@groovy.apache.org
Subject: serializing closures
I've got a system with two apps, both of which read and write a large file of
serialized objects. One object, actually, which is "the database". I've
been updating this system to run under 2.5.8 and finally got around to testing
the first app writing this file and the second app reading it. All the
objects that are in "the database" are defined in a library that both apps use,
so there haven't been many problems in the past, except for the usual one of
adding a new class and forgetting to make sure it is serializable.I am getting
an invalidClassException because the serialVersionUIDs don't match, but the
class that is not matching is a class for a closure. In other words, I didn't
create this class, this is a class that Groovy creates to implement a closure.
This raises many questions.My system goes to some trouble to NOT serialize
closures. So, my real problem is figuring out where I am referring to a
closure where I shouldn't be. That is not the point of this message.
Instead, it is: 1) Wow! You can serialize closures? I wonder how that can
work? I suppose you should only evaluate them and get a return value. You
shouldn't raise an exception or anything funky like that. Serializing them
must serialize everything that the closure references.2) So the Groovy compiler
won't give the same serialVersionUID to the same closure class compiled two
different times? Doesn't that sort of defeat the purpose of serializing
closures? Or is something causing this problem, like using two different
versions of the Groovy compiler? As far as I can tell, I am using the same
version for both programs.I always assumed that you couldn't serialize
closures. It would be helpful to me if there were a way to cause an error
when I tried to write out a closure, rather than waiting until I read it back
in.-Ralph Johnson
