Hi all,
as some may know Groovy has this @Grab feature, which works only
partially in JDK9, because of the change of not using an URLClassLoader
anymore for the startup class loaders.
Now I am of course wondering what the exact requirements are for a
program to get a module jar from the Internet (let us assume we have a
solution for that part), and then load it, so that a program can use
classes from this module as well as any services the module may provide.
And of course let us discuss this for Java-only code, I should then be
able to make the transition to Groovy code quite easily.
So the scenario I would like to sketch out is the following... I want to
deliver a precompiled jar that will download its dependencies by itself.
Let us say we will use a sql driver as well as a custom xml parser and
asciidoc. The driver spec will be given in at the command line. The
purpose of the program is to load an xml report, transform it to
asciidoc and then save that in a predefined sql table.
To start off I guess there would be a small gateway program, that
handles the command line arguments and issues the download of the
modules. What comes after that? Is it as easy as spawning a new class
loader and load the modules in that loader as well as the reminder of
the program? Is there an alternative way of doing this? How do I add the
modules to the current layer? Or if a different layer... Will my program
then still have access to the services?
bye Jochen
- automatically downloading and enabling a jigsaw module Jochen Theodorou
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