Question

How can I run a servlet (UploadAction from GWTUpload project) under grails? I’ve successfully added the servlet and use it from the web.xml file. However, I really want to wrap some logic around the doPost/doGet methods using the grails framework (gorm).

Can I just subclass the servlet as a Controller, maybe just instantiate the servlet in the controller and call init()? I’m not sure how to do this properly.

Answer 1

The simplest thing that comes to my mind is:

• write a grails controller, instantiate the servlet (once, in the contstructor or in @PostConstruct) and call init()`
• map the controller method (via UrlMappings.groovy) to the url that your servlet would be mapped
• call servlet.service(request, response).

It’s a bit of a hack though. Another way is to get ahold of a spring (grails) bean in a filter applied to the servlet, with WebApplicationContextUtils.getRequiredWebApplicationContext(getServletContext()) and invoke the custom logic there.