[ANN] Eclipse RDF4J 2.4 released

We are very pleased to announce the release of Eclipse RDF4J 2.4. This
release addresses over 50 issues, and includes several major new features
and improvements, including:

   - Several improvements to the RDF4J Console
   <http://docs.rdf4j.org/server-workbench-console/#_rdf4j_console>,
   including command history, a convert and an export command.
   - RDF4J SparqlBuilder <http://docs.rdf4j.org/sparqlbuilder/>, a new
   fluent API for creating SPARQL queries in Java
   - Enhanced JSON-LD support with hierarchical JSON-LD writing
   <https://github.com/eclipse/rdf4j/issues/1049>
   - Improved GeoSPARQL <http://docs.rdf4j.org/programming/#_geosparql>
   support
   - Apache Lucene and Apache Solr support upgraded to version 6.6
   - ElasticSearch support upgraded to version 5.6
   - An official RDF4J Server/Workbench docker image
   - Improvements to the experimental SHACL implementation

For a full overview of all addressed issues, see the release notes
<https://github.com/eclipse/rdf4j/releases/tag/2.4.0>.

RDF4J 2.4 is a minor release and as such it is backward compatible with
previous releases. Existing users of the Lucene, Solr, and ElasticSearch
functionality are advised to upgrade their indexes
<https://lucene.apache.org/core/6_6_0//core/org/apache/lucene/index/IndexUpgrader.html>
for best performance.

Note: as this release is hot off the press, it may take a little while for
it show up in the Central Repository.
Links

   - Download RDF4J <http://rdf4j.org/download/>
   - RDF4J 2.4.0 release notes
   <https://github.com/eclipse/rdf4j/releases/tag/2.4.0>
   - Sesame to RDF4J Migration Guide
   <http://rdf4j.org/doc/sesame-to-rdf4j-migration-guide/>
   - Eclipse RDF4J project planning
   <https://projects.eclipse.org/projects/technology.rdf4j>


Regards,

The RDF4J Developers