Hi,
I'm trying to switch a project from OSGi to Jigsaw with the latest JDK 9
ea build (168). The most is working fine and I like that it is much
easier and much more practical than OSGi.
But there is one strong limitation within Jigsaw which I don't
understand, which is much more restrictive even than OSGi and which will
be a big problem to introduce Jigsaw in other projects: Non-exported
split packages
(http://openjdk.java.net/projects/jigsaw/spec/issues/#AvoidConcealedPackageConflicts).
OSGi allows such private split packages, Jigsaw doesn't. In my
understanding only packages which are declared in the module-info class
should get checked for split packages and Jigsaw shouldn't care about
internal module structures.
Mark Reinhold wrote, that it will be solved in a future release, but
this is a strong, useless, unnecessary restrictive limitation which will
cause a lot of problems when the people try to use Jigsaw in their
projects. It blocks me and it will block others. And even worse: It will
lead and force to senseless internal module structures, which can get
reverted when the future release gets released...
There is a very practical example which isn't a bad practice: Resources.
Imagine that every Java module has its own ResourceBundle properties for
multi-language support (or imagine any other file which is not a Java
class). These files are typically placed in a "conf", "etc" or
"resources" folder structure and added to the classpath. It should not
be necessary that every module has another place for such resources,
that would be a bad solution! Java throws a LayerInstantiationException
on starting the application when multiple modules have the same resource
folder structures... How should resources be organized in your opinion?
Should conf/etc/resources renamed and restructured to common package
names starting with the top level domain? I don't want to change my
projects in such a way for Jigsaw, it shouldn't be necessary...
I would be happy when this is fixed within the first release of Java 9 /
Jigsaw (and I don't belong to Red Hat or IBM ;-)).
Thank you in advance.
Best regards,
Sven Strohschein
