How to let new thread to access EJB

I start new thread in Servlet class and I want this thread to call EJB business method but I get following error:
javax.naming.NameNotFoundException: Name comp/env/ejb not found in context "java:"
Probablly because thread has no credentials and so on. I know this concept violates J2EE specs but I don't know how to make timer to call business mathod every N minutes (I use J2EE 1.3 so I can't use Tiemr EJB).
I suspect that this new thread has no credentials and no role. What happens if I set run-as some role in servlet? As I saw new thread still has no credentials and role.
Can anyone suggest me how can I set credentials to new thread so it can call EJB business method or how to implement timer service in J2EE 1.3.

I start new thread in Servlet class and I want this
thread to call EJB business method but I get
following error:
javax.naming.NameNotFoundException: Name comp/env/ejb
not found in context "java:"It may happen because you'r new thread doesnt have information (JNDI environment) about EJB references.
Can anyone suggest me how can I set credentials to
new thread I guess it's server specific.
so it can call EJB business method or how
to implement timer service in J2EE 1.3.Don't use EJB reference. Lookup EJB by it's global JNDI name.

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