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| <h1 class="title">Migrating from Jena2 to Jena3</h1> |
| |
| <p>Apache Jena3 is a major version release for Jena - it is not binary compatible with |
| Jena2. The migration consists of package renaming and database reloading.</p> |
| <h2 id="key-changes">Key Changes</h2> |
| <ul> |
| <li><a href="#packaging">Package renaming</a></li> |
| <li><a href="#rdf11-plain-literals">RDF 1.1 Semantics for plain literals</a></li> |
| <li><a href="#persistent-data">Persistent data (TDB, SDB) should be reloaded.</a></li> |
| <li>Java8 is required.</li> |
| <li><a href="#permissions-changes">Security renamed to Permissions. Security Evaluator changes required</a></li> |
| </ul> |
| <h2 id="packaging">Package Name Changes</h2> |
| <p>Packages with a base name of <code>com.hp.hpl.jena</code> become <code>org.apache.jena</code>.</p> |
| <p>Global replacement of <code>import com.hp.hpl.jena.</code> with <code>import org.apache.jena.</code> will cover the majority of cases.</p> |
| <p>The Jena APIs remain unchanged expect for this renaming.</p> |
| <h3 id="vocabularies-unchanged">Vocabularies unchanged</h3> |
| <p>Only java package names are being changed. Vocabularies are not affected.</p> |
| <h3 id="assemblers">Assemblers</h3> |
| <p>Migration support is provided by mapping <code>ja:loadClass</code> names beginning |
| <code>com.hp.hpl.jena</code> internally to <code>org.apache.jena</code>. A warning is logged.</p> |
| <h3 id="logging">Logging</h3> |
| <p>This will also affect logging: logger names reflect the java class naming |
| so loggers for <code>com.hp.hpl.jena</code> become <code>org.apache.jena</code></p> |
| <h2 id="rdf-11">RDF 1.1</h2> |
| <p>Many of the changes and refinements for RDF 1.1 are already in Jena2. The |
| parsers for Turtle-family languages already follow the RDF 1.1 grammars |
| and output is compatible with RDF 1.1 as well as earlier output details.</p> |
| <h3 id="rdf11-plain-literals">RDF 1.1 changes for plain literals</h3> |
| <p>In RDF 1.1, all literals have a datatype. The datatype of a plain |
| literal with no language tag (also called a “simple literal”) has datatype |
| <code>xsd:string</code>. A plain literal with a language tag has datatype |
| <code>rdf:langString</code>.</p> |
| <p>Consequences:</p> |
| <p><code>"abc"</code> and <code>"abc"^^xsd:string</code> are the same RDF term in RDF 1.1. Jena2 |
| memory models have always treated these as the same value, but different |
| terms. Jena2 persistent models treated them as two separate term and two |
| separate values.</p> |
| <p>Data is not invalidated by this change.</p> |
| <ul> |
| <li> |
| <p>The parsers will give datatypes to all data read, there is no need to |
| change the data.</p> |
| </li> |
| <li> |
| <p>Output is in the datatype-less form (an abbreviated syntax) even in |
| N-triples.</p> |
| </li> |
| <li> |
| <p>Applications which explicitly use <code>^^xsd:string</code> (or in RDF/XML, |
| <code>rdf:datatype="http://www.w3.org/2001/XMLSchema#string"</code>) will see a change |
| in appearance.</p> |
| </li> |
| <li> |
| <p>Applications with a mix of plain literals and explicit <code>^^xsd:string</code> |
| (the RDF 1.1 Work Group believed these to be uncommon) may see changes.</p> |
| </li> |
| <li> |
| <p>Applications that do their own RDF output need to be careful to not assume |
| that having datatype excludes the possibility of also having a language tag.</p> |
| </li> |
| </ul> |
| <h2 id="persistent-data">Persistent Data</h2> |
| <p>For data stored in <a href="tdb/">TDB</a> and <a href="sdb/">SDB</a>, it is advisable to reload data.</p> |
| <p>Data that does not use explicit <code>xsd:string</code> should be safe but it is still |
| recommended that data is reloaded at a convenient time.</p> |
| <p>Data that does use explicit <code>xsd:string</code> must be reloaded.</p> |
| <h2 id="permissions-changes">Security package renamed to Permissions</h2> |
| <p>Jena Security has been renamed Jena Permissions and the Maven |
| <em>artifact id</em> has been changed to <em>jena-permissions</em> to reflect this change.</p> |
| <p>Shim code that was introduced to map Jena classes to security classes |
| has been removed. This change requires changes to <code>SecurityEvaluator</code> |
| implementations. More details are available at the |
| <a href="permissions/migration2To3.html">Permissions |
| migration documentation</a>.</p> |
| <h2 id="other">Other</h2> |
| <ul> |
| <li><code>GraphStore</code> interface has been removed</li> |
| <li><code>ModelFactory.createFileModelMaker</code> has been removed</li> |
| <li><code>LateBindingIterator</code> has been removed: use <code>LazyIterator</code> instead</li> |
| <li><code>EarlyBindingIterator</code> has been removed: no replacement</li> |
| <li><code>UniqueExtendedIterator</code> has been removed: use <code>ExtendedIterator</code> with unique filter</li> |
| </ul> |
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