Using Stardog in Maven/OSGi

[Niels Van Hauwermeiren]

Hello,

I've been succesfully using Stardog in a java project for a few months now and everything works fine, but recently I'm trying to port my existing project to OSGi to make it more modular. And I have encountered a few problems with Stardog while doing this.

The main point is that Maven doesn't seem to find the libraries needed to work with Stardog. Sure there are some libraries for "groovy" or "spring" but none of those seem to be able to do even the most basic of things.

Here's an example of basic Java code to connect to a Stardog-server:

Connection aConn = ConnectionConfiguration.to(database).credentials(databaseUsername, databasePassword).server(databaseLocation).connect();

(database, databasePassword, databaseUsername and databaseLocation are Strings with the correct info in them)

This code works fine if I manually add all the jars in a regular Java-project but they don't work with Maven. Maven doesn't seem to find these dependencies. 

com.complexible.stardog.api.Connection;

com.complexible.stardog.api.ConnectionConfiguration

Running the MavenInstall.bat script as explained on the website did not help this. 

Can anyone who has successfully used Stardog in a Maven-project help me out here?

Surely, I can't be the first one with this problem?

cheers, 

Niels Van Hauwermeiren

[Al Baker]

Niels,

Make sure your Maven is configured to use your local m2 cache repository.   That's where the mavenInstall script places the jars.

If you use Gradle, use the mavenLocal () call before mavenCentral ().  For Maven proper, the setting goes in your settings.xml.

Regards,
Al

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[Niels Van Hauwermeiren]

Al,

It was indeed a matter of configuring my settings.xml and then updating the local repository index under netBeans Everything works fine now.

Thanks for the fast reply,

Niels

[Niels Van Hauwermeiren]

Hi Al,

I have a bit of a follow-up question regarding the same issue as yesterday.

So after configuring my settings.xml Maven managed to find the packages and I could work with them as usual. Which I spent most of today doing.

However this only seems to work at compile-time. once I try to run the osgi-bundle in glassfish it gets installed, but not started.

Trying to manually start it gives me this error:

org.osgi.framework.BundleException: Unresolved constraint in bundle thesis.DataBroker [330]: Unable to resolve 330.1: missing requirement [330.1] osgi.wiring.package; (osgi.wiring.package=com.complexible.common.iterations)

If I get it correctly he doesn't actually load the needed jar into the bundle and thus can't properly run?

So do you have any idea what is causing this weird behaviour  and how to solve this? 

Cheers,

Niels

[Al Baker]

Hi Niels,

The Stardog jars do not include a Manifest line for the packages they export for use w/ OSGi, so you’ll have to add them to your own, see here for a discussion on this topic:

http://stackoverflow.com/questions/8352710/osgi-missing-requirement-error

Thanks,

Al