Hi,
Yes, if a method starts with underscore(_), it is private method. Otherwise, it is public method.
Actually, we are not allowed to provide private methods in our answers and we can only provide public methods in our sample code.
It is more safe to overwrite/customize public methods, but you should also be careful to do that. As I said, the best way is to raise a FER and get official support from IBM. When we get a support case, we will first to ask customer to disable all the plugins and then debug the issue.
Thanks,
Jason
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