Hi,

I’ll add a note that we added the limit in 4.0.0, before that we didn’t have any way to limit the number of items in a subscription (which is bad, since you typically want to have “a limit” like you do with subscriptions etc.). We set the default at 1000 initially, which was later noticed to be too low of a default so it was increased to 10000 in later 4.x versions. In theory there is no upper bound (or well int max value as that is used to configure it) in technical sense (CPU or RAM limits will be hit at some point though)

P.S.
NOTE! Please update to 4.8.2, that is the latest release https://downloads.prosysopc.com/opcua/Prosys_OPC_UA_SDK_for_Java_4_Release_Notes.html#version-4-8-2, (4.8.0 included a security fix: https://downloads.prosysopc.com/opcua/Prosys_OPC_UA_SDK_for_Java_4_Release_Notes.html#version-4-8-0).

If it is something that has previously worked for you, yes. So basically you should be able to use/set any value between 1 and Integer.MAX_VALUE (though we have typically tested with like around 1000 and 10000). Basically using Integer.MAX_VALUE would be almost the same as before 4.x, though it is still “a limit” vs. none at all.