[GROOVY-7000] Support MarkupTemplateEngine integration with TemplateServlet

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.3.9, 2.4.0-rc-1
• Fix Version/s: 2.3.10, 2.4.1
• Component/s: Groovlet / GSP, Templating
• Environment: Java 1.8, Mac 10.9.4, Groovy 2.3.x, Servlet 2.5 (Google App Engine)
• Assignee: Unassigned
• Reporter: Kunal Dabir
• Created: 03/Aug/14 04:41
• Updated: 23/Feb/15 01:12
• Resolved: 01/Jan/15 04:11

Description

Groovy's TemplateServlet allows init-param to swap the template engine implementation such that the following should work:

     <init-param>
        <param-name>template.engine</param-name>
        <param-value>groovy.text.markup.MarkupTemplateEngine</param-value>
     </init-param>

This give's exception :

SEVERE: javax.servlet.ServletContext log: markupTemplateServlet: Could not instantiate template engine: groovy.text.markup.MarkupTemplateEngine
java.lang.InstantiationException: groovy.text.markup.MarkupTemplateEngine.<init>()

It understandably wouldn't work as MarkupTemplateEngine doesn't provide any default constructor. Even if it did, there wouldn't be a possibility to pass the desired configuration object to this servlet.