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yes,
the Map instance may be kept by Lightstreamer for some time after the "update" call has returned;
therefore, reusing the Map instance by the Data Adapter is not supported.
You need to change...

Hi Riad

Please check that your Data Adapter does not reuse the same event object across the multiple calls on the ItemEventListener. Reusing the object is not supported, since Lightstreamer Server...

Hi Riad

about your questions 1 and 2,
the Server sends "UNCHANGED" placeholders when field values are indeed unchanged across subsequent events (of course, the "UNCHANGED" notification is not...