Hi Andy, There are a few things that make OSGi provisioning difficult. Specifically, the jena-osgi artifact (in its current form in 4.2.0-RC-1 and on the main branch) includes the following Import-Package declarations:
com.apicatalog.jsonld, com.apicatalog.jsonld.api, com.apicatalog.jsonld.document, com.apicatalog.rdf, com.apicatalog.rdf.spi, jakarta.json;version="[2.0,3)" This requires the titanium and jakarta dependencies to be present. Those dependencies are not present in Jena's features.xml configuration, though a user could add those bundles separately. Unfortunately, the Titanium dependencies are not OSGi bundles, so they cannot be added directly. In Apache Karaf, there is a mechanism by which one can "wrap" a non-OSGi bundle, but this does not work with Titanium. I am not entirely sure why it doesn't work, but I suspect that it is an upstream issue that should be sorted out with the titanium project (I will pursue that separately). There is no particular difficulty installing the jakarta.json bundle, but that is only needed when Titanium is present. By setting those dependencies as optional (as is done in that PR), a user who does not use those features will not need to have those dependencies present. And given that Titanium doesn't appear to work in OSGi, an OSGi user will likely not be using Titanium. I will add, though, that I have more or less given up on working with OSGi -- it presents a lot of challenges that can be hard to sort out (as you can see based on this thread). Plus, in my opinion, many of the advantages of OSGi are relevant only in servers where multiple applications exist in a shared JVM runtime. With runnable jars, docker, kubernetes, etc, I have found deployment models that are much easier to manage than OSGi runtimes. All of which is to say: perhaps the Jena project should consider whether OSGi should be supported in the future. -Aaron On Tue, 14 Sept 2021 at 05:47, Andy Seaborne <a...@apache.org> wrote: > > > On 14/09/2021 01:18, Aaron Coburn wrote: > ... > > I did find that the OSGi deployment failed on the new Titanium > > dependencies. I have submitted a PR that fixes this: > > https://github.com/apache/jena/pull/1072 > > Hi Aaron, > > Not being an OSGi user, I have some simple questions: > > What's the issue here? (what actually goes wrong - the PR says > installing Jena in an OSGi runtime is difficult - does that mean > impossible?) > > Is it with Titanium or the jakarta dependencies? > > If it's Titanium, is there something to ask for upstream? > > Andy >
