Servlets with multiusers?

I have created a set of servlets which seem to have been working fine

but it has now come to light that each servlet can only be used by 1 person at any one time.

I feel there can be only 3 reasons for this

1. My servlets are coded incorrectly.

2. The server is not set up correctly.

3. Servlets only support 1 user at a time (I am sure this can not be true)

Has anyone seen this before and tell me where my problems lie?

[478 byte] By [simon_orange] at [2007-9-26 4:50:48]