On 2/12/20 8:57 PM, Alex Scheel wrote: > Per $SUBJ, I was looking for guidance from the Java community about > embedding .so files within JARs. > > I found these docs: > > https://docs.fedoraproject.org/en-US/packaging-guidelines/Java/#_applicability > > Which seem to have conflicting commentary on this: > > - A Java package uses JNI if it contains a .so file. Note that this file can > be embedded within JAR files themselves. - JAR files using JNI or containing JNI shared objects themselves MUST be placed in %{_jnidir} and MAY be symlinked to %{_libdir}/%{name}. > - JNI shared objects MUST be placed in %{_libdir}/%{name} > > As long as the JAR for the application is played in > %{_libdir}/%{name}/%{name}.jar, does this mean that the .so can be > placed within the JAR? Yes. This is explicitly permitted by the rule above. > The benefit to .so-in-JAR is that the JAR always knows where to find > the .so, even if the user installs multiple versions of the same > package, or, worse, copies JARs from different systems around. > > > Wondering what the community's thoughts are, Hidden shared objects have to be unpacked somewhere in order to be used. If they're unpacked somewhere private they won't be shared. And the runtime code will need to find the correct shared object, the one relevant to the machine in use. I've seen this break on new architectures. So, generally it's not such a great idea to hide shared objects in JARS, but it's not absolutely forbidden because we know that sometimes this is what Java programs do and we don't want to burden packagers unduly. -- Andrew Haley (he/him) Java Platform Lead Engineer Red Hat UK Ltd. <https://www.redhat.com> https://keybase.io/andrewhaley EAC8 43EB D3EF DB98 CC77 2FAD A5CD 6035 332F A671 _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@xxxxxxxxxxxxxxxxxxxxxxx
