Lightstreamer Performance Issues while fetching data from db

[GoatHunter]

So HashMap objects are not allowed to be supplied as the 2nd parameter of smartUpdate() ?

Since it can recieve a Map descendant object, or am I getting this all wrong?

Thanks again

[DarioCrivelli]

You can supply HashMap objects as the 2nd parameter of smartUpdate.
The only restriction is that you have to use a brand new HashMap object instance on each invocation. Put in a more general way, once a HashMap object is supplied to smartUpdate, you can no longer use it.
Depending on what you get from your feed interface, you may have to perform some copy or clone operation.

However, Map objects which are not also HashMap objects are not subject to the restriction.
(I'm not sure if this also answers your second question).