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    <p>AFAIK, there is no <em>natual</em> way to make that happen. A portlet <strong>need not</strong> always be installed on a page. So, the behaviour is quite normal.</p> <p>One rather <em>hacky</em> solution I could think of:</p> <ol> <li><p>Get hold of the <code>ThemeDisplay</code> object in a JSP using <code>&lt;liferay-theme:defineObjects /&gt;</code> which would expose the implicit object <code>themeDisplay</code> in the JSP scope.</p></li> <li><p>Get hold of the type settings string using:</p> <pre><code>String typeSettings = themeDisplay.getLayout().getTypeSettings(); </code></pre></li> <li><p>Type settings will have values like the below:</p> <pre><code>layout-template-id=foobar_2column sitemap-include=1 column-1=foo_WAR_barportlet,abc_WAR_barportlet,56_INSTANCE_K4Vv, column-2=baz_WAR_xyzportlet, sitemap-changefreq=daily </code></pre></li> <li><p>So if you have a non-instanceable portlet with ID <code>foo</code> inside WAR file <code>bar</code>, the portlet's unique ID on the layout will be <code>foo_WAR_barportlet</code>.</p></li> <li><p>Once you know the portlet ID that you're expecting to be present, it's just a matter of string contains check.</p> <pre><code>&lt;% if(!typeSettings.contains("foo_WAR_barportlet")) { %&gt; &lt;h3 style="color: red"&gt;Alert! Portlet foo_WAR_barportlet not installed.&lt;/h3&gt; &lt;% } %&gt; </code></pre></li> </ol> <p>You can do the above steps even inside a theme, but you'll have to do it in Velocity instead of Java then. Hope that helps.</p> <p><em><strong>EDIT</em></strong></p> <p>You can add this line inside your <code>portal_normal.vm</code></p> <pre><code>#if(!$layout.getTypeSettings().contains("foo_WAR_barportlet")) &lt;h3 style="color: red"&gt;Alert! Portlet foo_WAR_barportlet not installed.&lt;/h3&gt; #end </code></pre>
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    1. COwhere would I add this code?
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    2. COYou can add this into the theme, but then you'll have to modify it slightly as themes are written in Velocity.
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    3. CO@Queequeg see my update
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