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| <a href="index.html" title="back to Core Developers Guide"><< back to Core Developers Guide</a> |
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| <h1 id="development-mode-aka-devmode">Development Mode (aka “devMode”)</h1> |
| |
| <p>Please turn this option off before deploying application to a production environment - it can expose sensitive data of your application!</p> |
| |
| <p>Struts 2 has a setting (which can be set to <code class="language-plaintext highlighter-rouge">true</code> or <code class="language-plaintext highlighter-rouge">false</code> in <a href="default-properties">default.properties</a>) |
| called devMode (= development mode). When this setting is enabled, Struts 2 will provide additional logging and debug |
| information, which can significantly speed up development.</p> |
| |
| <p>You can also set this constant in your struts.xml file: <code class="language-plaintext highlighter-rouge"><constant name="struts.devMode" value="true" /></code>.</p> |
| |
| <p>This is the preferred method. See <a href="constant-configuration">Constant Configuration</a> for more information.</p> |
| |
| <h2 id="what-does-it-do">What does it do?</h2> |
| |
| <ul> |
| <li>When enabled, Struts 2 will reload your <strong>resource bundles on every request</strong> (meaning you can change your .properties |
| files, save them, and see the changes reflected on the next request). |
| <strong>Note</strong>: this option can also be set standalone via <code class="language-plaintext highlighter-rouge">struts.i18n.reload = true</code></li> |
| <li>It will also <strong>reload your xml configuration files</strong> (<a href="struts-xml">struts.xml</a>), your <strong>validation files</strong>, |
| and so on, on every request. This is useful for testing or fine-tuning your configuration without having to redeploy |
| your application every time. |
| <strong>Note</strong>: this option can also be set standalone via <code class="language-plaintext highlighter-rouge">struts.configuration.xml.reload = true</code></li> |
| <li>And thirdly, perhaps the setting which is less widely known, and therefore a source of much confusion: it will |
| <strong>raise the level of debug or normally ignorable problems to errors</strong>. For example: when you |
| <strong>submit a field which cannot be set on an action</strong> ‘someUnknownField’, it will normally be ignored. However, when |
| you’re in development mode, <strong>an exception will be thrown</strong>, telling you an invalid field was submitted. This is very |
| useful for debugging or testing large forms, but can also be confusing if you’re relying on parameters in your request |
| that are not set on the action, but which you are using directly in your view layer (<strong>warning</strong>: bad practice, |
| you should always validate input from the web).</li> |
| </ul> |
| |
| <h2 id="dont-forget">Don’t forget…</h2> |
| |
| <p>By default, the development mode is disabled, because it has a significant impact on <a href="performance-tuning">performance</a>, |
| since the entire configuration will be reloaded on every request.</p> |
| |
| <h2 id="page-rendering-is-slow">Page rendering is slow</h2> |
| |
| <p>If you experience slow page rendering when <code class="language-plaintext highlighter-rouge">devMode</code> is on it’s mostly because Freemarker cache is disabled during |
| <code class="language-plaintext highlighter-rouge">devMode</code>. You can explicit enable cache and any other options disabled by <code class="language-plaintext highlighter-rouge">devMode</code>, see example below:</p> |
| |
| <div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt"><constant</span> <span class="na">name=</span><span class="s">"struts.devMode"</span> <span class="na">value=</span><span class="s">"true"</span> <span class="nt">/></span> |
| <span class="nt"><constant</span> <span class="na">name=</span><span class="s">"struts.i18n.reload"</span> <span class="na">value=</span><span class="s">"false"</span><span class="nt">/></span> |
| <span class="nt"><constant</span> <span class="na">name=</span><span class="s">"struts.configuration.xml.reload"</span> <span class="na">value=</span><span class="s">"false"</span><span class="nt">/></span> |
| <span class="nt"><constant</span> <span class="na">name=</span><span class="s">"struts.freemarker.templatesCache"</span> <span class="na">value=</span><span class="s">"true"</span><span class="nt">/></span> |
| <span class="nt"><constant</span> <span class="na">name=</span><span class="s">"struts.freemarker.templatesCache.updateDelay"</span> <span class="na">value=</span><span class="s">"120"</span><span class="nt">/></span> |
| <span class="nt"><constant</span> <span class="na">name=</span><span class="s">"struts.freemarker.mru.max.strong.size"</span> <span class="na">value=</span><span class="s">"120"</span><span class="nt">/></span> |
| </code></pre></div></div> |
| <p>As you can see, you can switch <code class="language-plaintext highlighter-rouge">devMode</code> on and still have production options on as well.</p> |
| |
| <p>Please remember to use production optimized options which can be different than these used during development |
| (especially cache related)!</p> |
| |
| </section> |
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