How to change document type in document and media portlet in liferay?

First select menu "manage" on the top of document and media portlet. Choose the document type. Then, you can add new document type or edit them.

How to turn on ServiceLocator of Velocity in Liferay

Today, when I create a velocity template to generate menu to some static articles, I have to use ServiceLocator to get JournalArticleLocalService, but it seem nothing happens. After searching for longtime, I see that there is no error in code, but it doesn't work. Then I know that I didn't turn on variable serviceLocator for Velocity. To turn it on, please insert "journal.template.velocity.restricted.variables=" in file portal-ext.properties in liferay\tomcat-7.0.27\webapps\ROOT\WEB-INF\classes. Hope that this is solve your problem. Now this command works well: $serviceLocator.findService("com.liferay.portlet.journal.service.JournalArticleLocalService")