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<h1 class="post-title-main">Release notes 1.3.0</h1>
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<div class="summary">Version 1.3.0 of Eclipse Ditto, released on 30.09.2020</div>
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<p>Ditto <strong>1.3.0</strong> is API and <a href="https://github.com/eclipse/ditto/blob/master/documentation/src/main/resources/architecture/DADR-0005-semantic-versioning.md">binary compatible</a>
to prior Eclipse Ditto 1.x versions.</p>
<h2 id="changelog">Changelog</h2>
<p>Compared to the latest minor release <a href="release_notes_120.html">1.2.0</a>, the following changes, new features and
bugfixes were added.</p>
<h3 id="changes">Changes</h3>
<h4 id="update-akka-akka-http-and-scala-to-latest-versions"><a href="https://github.com/eclipse/ditto/issues/774">Update Akka, Akka HTTP and Scala to latest versions</a></h4>
<p>The core libraries Ditto is built on were updated to their latest versions which should improve cluster stability
and overall performance.</p>
<h4 id="removed-owasp-security-headers"><a href="https://github.com/eclipse/ditto/pull/804">Removed OWASP security headers</a></h4>
<p>Setting the <a href="https://owasp.org/www-project-secure-headers/">OWASP recommended secure HTTP headers</a>
(e.g. <code class="highlighter-rouge">X-Frame-Options</code>, <code class="highlighter-rouge">X-Content-Type-Options</code>, <code class="highlighter-rouge">X-XSS-Protection</code>) was removed from the Ditto codebase as such
headers are typically set in a reverse proxy (e.g. nginx) or in a cloud loadbalancer in front of Ditto.</p>
<h4 id="ditto-java-client-changed-default-initial-reconnect-behavior"><a href="https://github.com/eclipse/ditto-clients/pull/86">Ditto Java Client: Changed default initial reconnect behavior</a></h4>
<p>A newly created configuration was added whether a Ditto Java Client should retry connecting to a Ditto backend
even when the initial connection attempt failed
(see the <code class="highlighter-rouge">initialConnectRetryEnabled(boolean)</code> option on the <code class="highlighter-rouge">WebSocketMessagingConfiguration</code> builder).</p>
<div class="alert alert-danger" role="alert"><i class="fa fa-exclamation-circle"></i> <b>Warning:</b> The default behavior was changed so that a Ditto Java Client <strong>does not reconnect</strong>
when the initial connection to a Ditto WebSocket failed! <strong>Have a look at <a href="#migration-notes">the migration notes</a>
in order to restore the old behavior when updating to Ditto Java Client 1.3.0</strong>.</div>
<p>Previously, up to Ditto Java Client 1.2.x, the client always retried connecting, even when the initial connection
attempt failed.<br />
We got feedback that this is not always desirable, e.g. when the credentials are wrong during development, the initial
connection should fail with an exception instead, so this is the new default behavior.</p>
<h3 id="new-features">New features</h3>
<h4 id="automatic-creation-of-things"><a href="https://github.com/eclipse/ditto/issues/760">Automatic creation of things</a></h4>
<p>Added a <a href="connectivity-mapping.html">payload mapper</a> for connectivity which implicitly creates a new digital twin (thing)
for incoming messages: <a href="connectivity-mapping.html#implicitthingcreation-mapper">ImplicitThingCreation Mapper</a>.</p>
<p>This is very useful when e.g. a device connectivity layer (like <a href="https://eclipse.org/hono/">Eclipse Hono</a>) also
automatically creates connected devices, for example when a new device connects for the first time to an IoT gateway.</p>
<p>This new feature can work together with the
<a href="https://github.com/eclipse/hono/issues/2053">Hono feature for implicit registration of devices connected via gateways</a>.</p>
<h4 id="use-response-of-http-push-connections-as-live-message-response"><a href="https://github.com/eclipse/ditto/pull/809">Use response of HTTP push connections as live message response</a></h4>
<p>When <a href="connectivity-protocol-bindings-http.html">HTTP connections</a> there are now several options
to respond to published <a href="protocol-specification-things-messages.html">live messages</a>:
[Responding to messages](<a href="connectivity-protocol-bindings-http.html#responding-to-messages">HTTP connections</a></p>
<p>For example, it is possible to use the HTTP response of the foreign HTTP endpoint (Webhook) as Ditto live message
response.</p>
<h4 id="raw-payload-mapper-to-enable-raw-pass-through-of-live-messages"><a href="https://github.com/eclipse/ditto/issues/777">Raw payload mapper to enable raw pass-through of live messages</a></h4>
<p>Added a <a href="connectivity-mapping.html">payload mapper</a> for connectivity which converts consumed messages via connectivity
in “raw mode”: <a href="connectivity-mapping.html#rawmessage-mapper">RawMessage mapper</a>.</p>
<p>This mapper creates a <a href="protocol-specification-things-messages.html">Ditto Protocol live message</a> from consumed messages
preserving the payload (e.g. JSON or text, binary, etc.) and publishing that message again to interested subscribers.</p>
<p>This can be useful for connections which only need Ditto to forward a message to e.g. another connection or to a
WebSocket.</p>
<h3 id="bugfixes">Bugfixes</h3>
<p>Several bugs in Ditto 1.2.x were fixed for 1.3.0.<br />
This is a complete list of the
<a href="https://github.com/eclipse/ditto/pulls?q=is%3Apr+milestone%3A1.3.0">merged pull requests</a>, including the fixed bugs.<br />
Here as well for the Ditto Java Client: <a href="https://github.com/eclipse/ditto-clients/pulls?q=is%3Apr+milestone%3A1.3.0">merged pull requests</a></p>
<h4 id="responses-from-http-messages-api-were-json-escaped"><a href="https://github.com/eclipse/ditto/issues/805">Responses from HTTP /messages API were JSON escaped</a></h4>
<p>With Ditto 1.2.0 HTTP responses to the <code class="highlighter-rouge">POST /messages</code> APIs which transported <code class="highlighter-rouge">application/json</code> were falsely JSON
escaped. As the fix for that had to be done in several steps and at several places, the fix is not backported to the
Ditto 1.2.0 line and it is suggested to update to Ditto 1.3.0 right away, if affected by this bug.</p>
<h4 id="putting-_metadata-while-creating-a-thing-does-not-work-bug"><a href="https://github.com/eclipse/ditto/issues/801">Putting <code class="highlighter-rouge">_metadata</code> while creating a Thing does not work bug</a></h4>
<p>When putting <a href="basic-metadata.html">Metadata</a> as part of a “create thing” API call, the metadata was not applied. Only
when updating an existing thing, the metadata was applied.</p>
<h4 id="ditto-java-client-threads-leakage"><a href="https://github.com/eclipse/ditto-clients/pull/87">Ditto Java Client: threads leakage</a></h4>
<p>The Ditto Java client did not close/cleanup its threadpools when closing the client.</p>
<h2 id="migration-notes">Migration notes</h2>
<h3 id="check-initialconnectretryenabled-option-when-upgrading-to-ditto-java-client-130">Check <code class="highlighter-rouge">initialConnectRetryEnabled</code> option when upgrading to Ditto Java Client 1.3.0</h3>
<p>If you require that you Ditto Java Client reconnects even when the first connection attempt failed (this might e.g.
be useful when you use the client in a backend application which might be restarted or scaled up/down at any given time),
please configure the <code class="highlighter-rouge">initialConnectRetryEnabled(boolean)</code> to <code class="highlighter-rouge">true</code>:</p>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="n">AuthenticationProvider</span> <span class="n">authenticationProvider</span> <span class="o">=</span> <span class="o">...;</span>
<span class="n">MessagingProvider</span> <span class="n">messagingProvider</span> <span class="o">=</span>
<span class="n">MessagingProviders</span><span class="o">.</span><span class="na">webSocket</span><span class="o">(</span><span class="n">WebSocketMessagingConfiguration</span><span class="o">.</span><span class="na">newBuilder</span><span class="o">()</span>
<span class="o">.</span><span class="na">endpoint</span><span class="o">(</span><span class="s">"wss://ditto.eclipse.org"</span><span class="o">)</span>
<span class="o">.</span><span class="na">initialConnectRetryEnabled</span><span class="o">(</span><span class="kc">true</span><span class="o">)</span> <span class="c1">// set this to true in order to enable retry on initial connection errors</span>
<span class="o">.</span><span class="na">build</span><span class="o">(),</span> <span class="n">authenticationProvider</span><span class="o">);</span>
<span class="n">DittoClient</span> <span class="n">client</span> <span class="o">=</span> <span class="n">DittoClients</span><span class="o">.</span><span class="na">newInstance</span><span class="o">(</span><span class="n">messagingProvider</span><span class="o">);</span>
<span class="c1">// ...</span>
</code></pre></div></div>
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