show category with JournalArticle in structure template.ftl

<#--
Web content templates are used to lay out the fields defined in a web
content structure.

Please use the left panel to quickly add commonly used variables.
Autocomplete is also available and can be invoked by typing "${".
-->

<#assign AssetCategoryLocalService = serviceLocator.findService("com.liferay.asset.kernel.service.AssetCategoryLocalService") />
<#assign JournalArticleLocalService = serviceLocator.findService("com.liferay.journal.service.JournalArticleLocalService") />
<#assign journalArticle = JournalArticleLocalService.getArticle(getterUtil.getLong(groupId),.vars['reserved-article-id'].data) />
<#assign categories = AssetCategoryLocalService.getCategories("com.liferay.journal.model.JournalArticle", journalArticle.getResourcePrimKey()) />


<h2>${Position.getData()}</h2>

<p> 
<#if categories?has_content>
    <#list categories as category>
        ${category.getName()}${category?has_next?then(' | ', '')}
    </#list>
</#if>
</p>

<p>
${Intro.getData()?substring(0, 100)}...
</p>