>
> Besides, HashMap is not thread-safe, have you tried it with a
> thread-safe implementaion (i.e. Map m =
> Collections.synchronizedMap(new HashMap(...));)
>

Yep, that fixed it. Interestingly, the original servlet using the hashmap continues to work fine with Tomcat 4.1.31. I can only surmise that at one time, multiple accesses by the same client/session were serialised, either by Tomcat or by IIS. Anyone know?

Thanks for everyomes help.

Regards
Roger

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