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Implement custom RDF4J function for GraphDB


Implement custom RDF4J function for GraphDB

By : dasteralo
Date : October 21 2020, 08:10 PM
help you fix your problem In case the graphdb comes as a platform dependent embedded launcher, e.g. .exe, .deb etc. you'll need an additional step.
Under the installation folder (say GrapDBFree), there is a folder named app. First, place the jar with the custom function within app/lib folder and then, edit the app/GraphDBFree.cfg file by adding the jar to the app.classpath= entry declared there.
code :


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Sesame And RDF4J Custom Server Data Location

Sesame And RDF4J Custom Server Data Location


By : Alp Enes Arıcı
Date : March 29 2020, 07:55 AM
it helps some times OpenRDF Sesame is no longer maintained, it has been succeeded by the Eclipse RDF4J project. There is a migration guide available to help you figure out what to do when updating your project.
Although the Sesame project is no longer maintained, a documentation archive is available, and of course a lot of the RDF4J documentation also applies to Sesame, albeit with slightly different package names.
OpenDaylight OSGi not able to find RDF4J classes even after installing RDF4J bundles

OpenDaylight OSGi not able to find RDF4J classes even after installing RDF4J bundles


By : orm
Date : March 29 2020, 07:55 AM
hope this fix your issue Okay, I have got it working for now. I manually installed the rdf4j-runtime-osgi bundle and other required dependencies. These are the bundles I installed:
code :
bundle:install -s mvn:org.mapdb/mapdb/1.0.8
bundle:install -s mvn:com.spatial4j/spatial4j/0.4.1
bundle:install -s mvn:com.opencsv/opencsv/3.2
bundle:install -s mvn:org.apache.httpcomponents/httpcore-osgi/4.4.6
bundle:install -s mvn:org.apache.httpcomponents/httpclient-osgi/4.5.3
bundle:install -s mvn:com.fasterxml.jackson.core/jackson-annotations/2.9.0
bundle:install -s mvn:com.fasterxml.jackson.core/jackson-core/2.9.0
bundle:install -s mvn:com.fasterxml.jackson.core/jackson-databind/2.9.0
bundle:install -s mvn:ch.qos.logback/logback-core/1.2.2
bundle:install -s mvn:org.slf4j/slf4j-api/1.7.25
bundle:install -s mvn:ch.qos.logback/logback-classic/1.2.2
bundle:install -s mvn:com.github.jsonld-java/jsonld-java/0.11.1
bundle:install -s mvn:org.eclipse.rdf4j/rdf4j-runtime-osgi/2.2.2
    <bundle><![CDATA[wrap:mvn:org.mapdb/mapdb/1.0.8$Bundle-Version=1.0.8&Bundle-SymbolicName=mapdb]]></bundle>
    <bundle><![CDATA[wrap:mvn:com.spatial4j/spatial4j/0.4.1$Bundle-Version=0.4.1&Bundle-SymbolicName=spatial4j]]></bundle>
    <bundle><![CDATA[wrap:mvn:com.opencsv/opencsv/3.2$Bundle-Version=3.2&Bundle-SymbolicName=opencsv]]></bundle>
    <bundle><![CDATA[wrap:mvn:org.apache.httpcomponents/httpcore-osgi/4.4.6$Bundle-Version=4.4.6&Bundle-SymbolicName=httpcore-osgi]]></bundle>
    <bundle><![CDATA[wrap:mvn:org.apache.httpcomponents/httpclient-osgi/4.5.3$Bundle-Version=4.5.3&Bundle-SymbolicName=httpclient-osgi]]></bundle>
    <bundle><![CDATA[wrap:mvn:com.fasterxml.jackson.core/jackson-annotations/2.9.0$Bundle-Version=2.9.0&Bundle-SymbolicName=jackson-annotations]]></bundle>
    <bundle><![CDATA[wrap:mvn:com.fasterxml.jackson.core/jackson-core/2.9.0$Bundle-Version=2.9.0&Bundle-SymbolicName=jackson-core]]></bundle>
    <bundle><![CDATA[wrap:mvn:com.fasterxml.jackson.core/jackson-databind/2.9.0$Bundle-Version=2.9.0&Bundle-SymbolicName=jackson-databind]]></bundle>
    <bundle><![CDATA[wrap:mvn:ch.qos.logback/logback-core/1.2.2$Bundle-Version=1.2.2&Bundle-SymbolicName=logback-core]]></bundle>
    <bundle><![CDATA[wrap:mvn:org.slf4j/slf4j-api/1.7.25$Bundle-Version=1.7.25&Bundle-SymbolicName=slf4j-api]]></bundle>
    <bundle><![CDATA[wrap:mvn:ch.qos.logback/logback-classic/1.2.2$Bundle-Version=1.2.2&Bundle-SymbolicName=logback-classic]]></bundle>
    <bundle><![CDATA[wrap:mvn:com.github.jsonld-java/jsonld-java/0.11.1$Bundle-Version=0.11.1&Bundle-SymbolicName=jsonld-java]]></bundle>
    <bundle><![CDATA[wrap:mvn:org.eclipse.rdf4j/rdf4j-runtime-osgi/2.2.2$Bundle-Version=2.2.2&Bundle-SymbolicName=rdf4j-runtime]]></bundle>
Specifying result MIME type when querying GraphDB via Javascript (RDF4J Server REST API)

Specifying result MIME type when querying GraphDB via Javascript (RDF4J Server REST API)


By : user1354174
Date : March 29 2020, 07:55 AM
I wish this help you Solved by starting graphDB with -Dgraphdb.workbench.cors.enable=true and removing dataType: 'jsonp'
Can an application directly program against GraphDB's underlying RDF4J database?

Can an application directly program against GraphDB's underlying RDF4J database?


By : Ethan L
Date : March 29 2020, 07:55 AM
I wish this help you I think there is a bit of confusion here. GraphDB does not have an "underlying RDF4J/Sesame database". It's actually the other way around: RDF4J/Sesame provides a standardized Java access API for RDF databases, and GraphDB is an implementation of this API.
You can programmatically access a GraphDB store using the Sesame APIs, as explained in the GraphDB Documentation. Sesame provides ways to access a local database (embedded in your own application) or a remote database (accessible via HTTP). As you correctly surmised, you can not access a database locally with multiple applications - if more than one application needs access, you should have both applications access the database via HTTP (or have one application talk directly to the other application, but that requires a lot of custom coding).
RDF4j and GraphDB repository connection

RDF4j and GraphDB repository connection


By : C.Yeo
Date : March 29 2020, 07:55 AM
With these it helps I've a problem with rdf4j: i want to delete from my GraphDB repository "Feed" all the triples with feed:hashCode as predicate. , The problem is in this line:
code :
Repository repository = new SPARQLRepository("http://localhost:7200/repositories/Feed");
Repository repository = new SPARQLRepository("http://localhost:7200/repositories/Feed", "http://localhost:7200/repositories/Feed/statements");
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