Jersey / ServletContext and resource loading on startup.
- by Raphael Jolivet
Hello,
I'm kind of new in web development with Java.
I am developing a web service and I've chosen REST / Jersey for it.
I want to init some stuff on startup of the service and to keep them
all along the life of the service.
First question : Is the constructor of the Jersey Servlet a good place to do that ?
Basically, what I want to do is to load a config.ini file located in my WEB-INF directory.
Following this help, I understand I need a ServletContext to load my file as a resource.
However, it is not clear to me how to get this ServletContext in a Jersey Servlet, as it is not really an instance of a servlet, but rather a POJO with some annotations.
I wanted to try this tip, but the attribute "context" is null in the constructor. I think that Jersey might populate it after the constructor. Right ?
So how is the right way to do this ?
Here is my code so far :
/** Main REST servlet */
@Path("/")
public class Servlet {
// ----------------------------------------------------
// Constants
// ----------------------------------------------------
static private final String CONFIG_PATH = "/WEB-INF/config.ini";
// ----------------------------------------------------
// Attributes
// ----------------------------------------------------
/** Context */
@Context ServletContext context;
// ----------------------------------------------------
// Constructor
// ----------------------------------------------------
/** Init the servlet */
public Servlet() {
// Load config.ini from WEB-INF
Config.config = new Config(
this.context.getResourceAsStream(CONFIG_PATH));
// FAIL! this.context is null ...
}
// ----------------------------------------------------
// URI Handlers
// ----------------------------------------------------
/** Welcome page */
@GET
@Path("/")
@Produces(MediaType.TEXT_HTML)
public String welcome() {
return "<h1>Hi there.</h1>";
}
}
Any help would be much appreciated.
Thanks in advance,
Raphael
