On 24/08/2024 11:51, PavelTurk wrote:
Hello all.
Let's consider there are two java applications (in two different
processes). Application A is mine and I can do whatever I want with it.
Application B is the application I can't (or I don't want to) modify.
Now in Application A I need to get information about Application B
JPMS layers, JPMS modules etc. As I understand I can do
it via java agent. But I can't find information how I can get all JPMS
layers of the Application B in this agent.
Could anyone say how to do it, if it is possible. Or maybe there are
different ways to do it.
There aren't any APIs to enumerate "all module layers". However, if B is
deployed with a Java agent that is under A's control then code in the
agent can use Instrumentation::getAllLoadedClasses and use that to
reconstruct the directed graph of modules layers (see Class::getModule
and Module::getLayer). It would of course require an out of band means
to communicate a representation of that graph to A but that shouldn't be
too hard.
-Alan
