<context-param>
   <param-name>app.allowServerCommunication</param-name>
   <param-value>true</param-value>
</context-param>

<listener>
   <display-name>ImageIO service provider loader/unloader</display-name>
   <listener-class>com.twelvemonkeys.servlet.image.IIOProviderContextListener</listener-class>
</listener>