Database resource injection problem

Hi. I am having a problem getting a simple jdbc resource from my glassfish server. I am doing something like this:

@Resource(mappedName = "jdbc/sample")

protected static DataSource pool;

... in one of my classes but the pool is always null. I am sure the resource exists since it comes as a default resource in glassfish. Any ideas what could be happening?

Thanx in advance

[404 byte] By [rreyesa] at [2007-11-27 10:19:04]