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| Apache Sling 12 released |
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| <strong>Table of Contents</strong> |
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| <div class="row" data-pagefind-body="true"><div><section><p>The Sling 12 release contains numerous improvements, such as official Java 17 support, complete migration to the [OSGi Feature Model](/documentation/development/feature-model.html], and various performance improvements and updates.</p> |
| <p>Read on to see more details about the individual improvements. To find out more about running Sling, see our <a href="/documentation/getting-started.html">getting started page</a>.</p> |
| <h2><a href="#official-support-for-java-17" id="official-support-for-java-17">Official support for Java 17</a></h2> |
| <p>The Sling Starter and included modules are validated to work on Java 8, 11, and 17. Note that for Java 17 the <code>org.apache.sling.commons.threads</code> will not clean up leftover <code>ThreadLocal</code> instances unless the <code>--add-opens java.base/java.lang=ALL-UNNAMED</code> is passed to the JVM.</p> |
| <p>This fix is already applied to the <a href="https://hub.docker.com/r/apache/sling">official Sling Starter Docker image</a> and we anticipate further fixes in this area.</p> |
| <h2><a href="#update-to-oak-1420" id="update-to-oak-1420">Update to Oak 1.42.0</a></h2> |
| <p><a href="jackrabbit.apache.org/oak/">Apache Jackrabbit Oak</a> 1.42.0 brings numerous performance improvements and new features that are now available in the Sling Starter.</p> |
| <h3><a href="#pre-authenticated-login-for-system-users" id="pre-authenticated-login-for-system-users">Pre-authenticated login for system users</a></h3> |
| <p><a href="https://jackrabbit.apache.org/oak/docs/security/authentication/preauthentication.html">Oak pre-authenticated login</a> without repository involvement presents a number of advantages:</p> |
| <ul> |
| <li>it is faster since the repository is not involved</li> |
| <li>allows mapping a single principal to the repositories of multiple service users, making ACLs easier to define in a fine-grained manner</li> |
| </ul> |
| <h3><a href="#principal-based-authentication" id="principal-based-authentication">Principal-based authentication</a></h3> |
| <p><a href="https://jackrabbit.apache.org/oak/docs/security/authorization/principalbased.html">Oak principal-based authentication</a> is an alternate way of supporting access control entries, with the main difference being that the policy entries are stored together with the user itself, rather than with the content they target.</p> |
| <p>The support has been implemented both in the Sling Starter and in repoinit.</p> |
| <h2><a href="#migration-to-the-feature-model" id="migration-to-the-feature-model">Migration to the feature model</a></h2> |
| <p>The Sling Starter is now built and launched with the [OSGi Feature Model](/documentation/development/feature-model.html]. This aligns our tooling with the upstream OSGi specification work from <a href="https://github.com/osgi/design/blob/master/rfps/rfp-0188-Features.pdf">RFP 188</a> and <a href="https://github.com/osgi/design/tree/master/rfcs/rfc0241">RFC 241</a> and provides significant additional tooling around composing, analysing, and launching Sling applications.</p> |
| <p>Applications based on Apache Sling are encouraged to evaluate migrating to the OSGi feature model.</p> |
| <h3><a href="#new-mechanism-for-launching-the-sling-starter" id="new-mechanism-for-launching-the-sling-starter">New mechanism for launching the Sling Starter</a></h3> |
| <p>The OSGi feature model does not support creating WAR files. The Sling Starter therefore no longer produces WAR files. The currently produced artifacts are:</p> |
| <ul> |
| <li>the <a href="https://hub.docker.com/r/apache/sling"><code>apache/sling:12</code> docker image</a></li> |
| <li>individual feature model files which define the bundles and configurations of the Sling Starter in JSON format</li> |
| <li>aggregate feature model files which contain include all the artifacts needed to launch Sling</li> |
| </ul> |
| <h2><a href="#support-for-content-package-development" id="support-for-content-package-development">Support for content-package development</a></h2> |
| <p>The Sling Starter fully supports development based on content packages. Content packages may be defined in the feature model, deployed via an HTTP API or using the Composum UI.</p> |
| <p>See <a href="/documentation/development/content-packages.html">Content-package based development</a> for more details.</p> |
| <h2><a href="#java-api-for-ordering-resources" id="java-api-for-ordering-resources">Java API for ordering resources</a></h2> |
| <p>The Sling <code>ResourceResolver</code> had gained a new <code>orderBefore</code> method that can be used to order child resources. Support needs to be added by various <code>ResourceProvider</code> implementations. Notably, the JCR ResourceProvider has support for this method.</p> |
| <h2><a href="#scripting-enhancements" id="scripting-enhancements">Scripting enhancements</a></h2> |
| <h3><a href="#new-scripting-engines" id="new-scripting-engines">New scripting engines</a></h3> |
| <p>The Sling Starter includes the Freemarker and Thymeleaf engines out-of-the-box.</p> |
| <h3><a href="#added-support-for-precompiled-scripts" id="added-support-for-precompiled-scripts">Added support for precompiled scripts</a></h3> |
| <p>Java and HTL scripts may now be precompiled for better runtime performance and build-time checks.</p> |
| <h2><a href="#improvements-in-run-mode-support" id="improvements-in-run-mode-support">Improvements in run mode support</a></h2> |
| <p>The Apache Sling Settings bundle now supports the OR (<code>,</code>) and AND (<code>.</code>) combinations of run modes and negations with <code>-</code> .</p> |
| <h2><a href="#running-multiple-versions-of-the-same-bundle-in-parallel" id="running-multiple-versions-of-the-same-bundle-in-parallel">Running multiple versions of the same bundle in parallel</a></h2> |
| <p>The Sling OSGi installer now supports running multiple versions of the same bundle in parallel. See <a href="/documentation/bundles/osgi-installer.html#multi-version-support-1">multi-version support in the OSGi installer</a> for details and limitations.</p> |
| <h2><a href="#performance-improvements-in-resource-resolution" id="performance-improvements-in-resource-resolution">Performance improvements in resource resolution</a></h2> |
| <ol> |
| <li>The result of <code>ResourceResolver.isResourceType</code> is cached</li> |
| <li>Optimised SQL queries are used when optimised alias resolution is enabled, ensuring especially to not touch areas like <code>/jcr:system</code> and <code>/jcr:versionStorage</code>. This applies to both aliases and vanity paths.</li> |
| <li>Spurious change events are no longer fired during content changes</li> |
| </ol> |
| <h2><a href="#repository-maintenance" id="repository-maintenance">Repository maintenance</a></h2> |
| <p>The repository maintenance bundle has been added to the Sling Starter. This allows configuring jobs running maintenance tasks, such as version purge, revision cleanup, and datastore cleanup.</p> |
| <h2><a href="#version-updates" id="version-updates">Version updates</a></h2> |
| <p>Multiple bundles have been updated to the latest versions. On top of other improvements listed in this page we have added the Sling <code>resource.filter</code> bundle and no longer include commons-lang 2 in the Sling Starter.</p> |
| <h3><a href="#osgi-core-r8-compliance" id="osgi-core-r8-compliance">OSGi Core R8 compliance</a></h3> |
| <p>Sling Starter ships with <a href="https://felix.apache.org/documentation/index.html">Apache Felix 7</a> which implements <a href="https://docs.osgi.org/specification/osgi.core/8.0.0/">OSGi Core R8</a> fully. In addition it comes with Felix SCR 2.2.0 which implements <a href="https://docs.osgi.org/specification/osgi.cmpn/8.0.0/service.component.html">Declarative Services 1.5</a> (part of OSGi Compendium R8).</p> |
| </section></div></div><div data-pagefind-body="true" data-pagefind-weight="7.0" style="display:none;"> - ( Apache Sling 12 released )</div> |
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