-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Hi,
I am currently experimenting with layers and running into
NoClassDefFoundErrors. Maybe someone on the list can help me out.
I create one layer on top of the boot layer and a second one on top of
the first. The second contains code that references a class from the
first. As I understand SOTMS[1] this should work. But it doesn't and
when I execute code in the second layer I get a NoClassDefFoundError.
In a little more detail...
I verified that all classes that are accessed across module boundaries
are exported. The individual modules correctly state their
dependencies on other modules.
This is how I create both layers (inspired by the Javadoc on
java.lang.reflect.Layer):
ModuleFinder finder = ModuleFinder.of(modulePaths);
Configuration configuration =
Configuration.resolve(
ModuleFinder.empty(),
parentLayer,
finder,
moduleNames);
ClassLoader loader =
new ModuleClassLoader(configuration);
return Layer.create(
configuration,
moduleName -> loader);
For the first layer 'parentLayer' is 'Layer.boot()', for the second
it's the first.
Then I add a read edge from the module that runs all this to the one
in the second layer that contains the code I actually want to execute.
Finally I access the code I actually want to run (in the second layer)
and invoke it. I then get a NoClassDefFoundError for a class that is
present in the first layer.
I tried adapting the 'parentLayer' to be used as the 'beforeFinder' in
'Configuration.resolve' instead of 'ModuleFinder.empty()' but that
gave me a 'LayerInstantiationException' ("Module java.base is already
defined").
Where did I get it wrong?
Thanks in advance
Nicolai
[1] last paragraph:
http://openjdk.java.net/projects/jigsaw/spec/sotms/#layers
- --
PGP Key:
http://keys.gnupg.net/pks/lookup?op=vindex&search=0xCA3BAD2E9CCCD509
Web:
http://codefx.org
a blog about software development
http://do-foss.de
Free and Open Source Software for the City of Dortmund
Twitter:
https://twitter.com/nipafx
Diaspora:
n...@pod.geraspora.de
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2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=ecE9
-----END PGP SIGNATURE-----
