Missing fields during serialization after upgrading Jackson 2 to Jackson 3

Ensure all getters follow standard JavaBean naming (getXyz()), as Jackson 3 strictly enforces it.
1. Rename the getter (preferred):

public List getEvents() {
    return events;
}

Jackson 3 enforces standard JavaBean naming (getEvents()), so this will serialize correctly.

2. Keep the old getter and use annotation:

@JsonProperty("events")
public List getevents() {
    return events;
}

This tells Jackson explicitly to use that method for JSON, keeping backward compatibility.

Both will make events appear in the JSON.