Configuration page of control panel portlet does not appear
<p>I've created a Liferay control panel portlet that works nicely.
Now I want to add a configuration page. I've done as follows:</p>

<ol>
<li>Add config-template init-parameter to portlet.xml</li>
<li>Add configuration-action-class to the liferay-portlet.xml</li>
</ol>

<p>But, the configuration menu does not appear:</p>

<p><a href="https://i.stack.imgur.com/s4FWt.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/s4FWt.png" alt="Configuration does not appear"></a></p>

<p>Here are the two descriptors.</p>

<p><strong>portlet.xml</strong></p>

<pre><code>&lt;portlet&gt;
    &lt;portlet-name&gt;manage-apples-portlet&lt;/portlet-name&gt;
    &lt;display-name&gt;Apple Management Admin&lt;/display-name&gt;
    &lt;portlet-class&gt;de.apples.portlet.ManageApplesPortlet&lt;/portlet-class&gt;
    &lt;init-param&gt;
        &lt;name&gt;config-template&lt;/name&gt;
        &lt;value&gt;/html/manage-apples-portlet/config.jsp&lt;/value&gt;
    &lt;/init-param&gt;
    &lt;init-param&gt;
        &lt;name&gt;view-jsp&lt;/name&gt;
        &lt;value&gt;/html/manage-apples-portlet/view.jsp&lt;/value&gt;
    &lt;/init-param&gt;
    &lt;init-param&gt;
        &lt;name&gt;jsp-path&lt;/name&gt;
        &lt;value&gt;/html/manage-apples-portlet/&lt;/value&gt;
    &lt;/init-param&gt;
    &lt;expiration-cache&gt;0&lt;/expiration-cache&gt;
    &lt;supports&gt;
        &lt;mime-type&gt;text/html&lt;/mime-type&gt;
    &lt;/supports&gt;
    &lt;resource-bundle&gt;content.Language&lt;/resource-bundle&gt;
    &lt;security-role-ref&gt;
        &lt;role-name&gt;administrator&lt;/role-name&gt;
    &lt;/security-role-ref&gt;
    &lt;security-role-ref&gt;
        &lt;role-name&gt;power-user&lt;/role-name&gt;
    &lt;/security-role-ref&gt;
    &lt;security-role-ref&gt;
        &lt;role-name&gt;user&lt;/role-name&gt;
    &lt;/security-role-ref&gt;
&lt;/portlet&gt;
</code></pre>

<p><strong>liferay-portlet.xml</strong></p>

<pre><code>&lt;portlet&gt;
    &lt;portlet-name&gt;manage-apples-portlet&lt;/portlet-name&gt;
    &lt;icon&gt;/icon.png&lt;/icon&gt;
    &lt;configuration-action-class&gt;com.liferay.portal.kernel.portlet.DefaultConfigurationAction&lt;/configuration-action-class&gt;
    &lt;control-panel-entry-category&gt;content&lt;/control-panel-entry-category&gt;
    &lt;control-panel-entry-weight&gt;10.0&lt;/control-panel-entry-weight&gt;
    &lt;instanceable&gt;false&lt;/instanceable&gt;
    &lt;css-class-wrapper&gt;manage-apples-portlet&lt;/css-class-wrapper&gt;
&lt;/portlet&gt;
</code></pre>

<p>Am I missing something?</p>