Before visualizing a graph in my application I always see a bunch (typically a few dozens) of these warnings being emitted:
...
2021-03-01 08:05:44,636 WARN [http-nio-8080-exec-3]
com.vaadin.flow.server.communication.rpc.AbstractRpcInvocationHandler: Got an RPC for non-existent node: 1989
2021-03-01 08:05:44,637 WARN [http-nio-8080-exec-3]
com.vaadin.flow.server.communication.rpc.AbstractRpcInvocationHandler: Got an RPC for non-existent node: 1986
2021-03-01 08:05:44,637 WARN [http-nio-8080-exec-3]
com.vaadin.flow.server.communication.rpc.AbstractRpcInvocationHandler: Got an RPC for non-existent node: 1989
2021-03-01 08:05:44,637 WARN [http-nio-8080-exec-3]
com.vaadin.flow.server.communication.rpc.AbstractRpcInvocationHandler: Got an RPC for non-existent node: 1986
2021-03-01 08:05:44,638 WARN [http-nio-8080-exec-3]
com.vaadin.flow.server.communication.rpc.AbstractRpcInvocationHandler: Got an RPC for non-existent node: 1989
2021-03-01 08:05:44,640 WARN [http-nio-8080-exec-3]
com.vaadin.flow.server.communication.rpc.AbstractRpcInvocationHandler: Got an RPC for non-existent node: 1989
...
The numbers emitted always seem to refer to a few nodes only (i.e. the variety is always small - in this case I had maybe 50 such warning lines all referring to either node 1989 or 1986).
The graph is a Chart(ChartType.LINE) containing typically between 5 and 25 lines passed as DataSeries to which the values were added as Number[n] [2] -tuples). The X-Axis is of type AxisType.DATETIME.
What is this warning trying to convey to me? What could be the reason? And what could I do to avoid these?