Ceylon Fat Jars
Ceylon 1.2.3 is looming closer, and so we should start talking about some of the new features that
it will contain. One of those new features is the new
ceylon fat-jar command.
ceylon fat-jar my.module/1 lets you generate a jar which contains the
my.module/1 module and
every required dependency. Once you have that jar, you can execute it with
java -jar my.module-1.jar
and it will execute the module.
Naturally, you can customise the function or class to execute with the
--run option, but the default
run method in your module (
my.module::run in our case).
The modules are executed in a "flat classpath" mode, without JBoss Modules or any sort of module isolation,
and with the metamodel already set up statically when the fat jar was created, so it's a little bit different
to the older alternative of running Ceylon modules using the
ceylon classpath tool, which did not deal
with packing all the dependencies. It is also different to the
ceylon run --flat-classpath in that it does
not require a module repository at run-time, since
ceylon fat-jar packs it all together.
Try it out, it's pretty useful to distribute Ceylon programs and run them in places without having to install the Ceylon distribution.