why does idea mark StringBuffer.append(Charsequence) as a blocking call?

# coroutines

[christophsturm]

why does idea mark StringBuffer.append(Charsequence) as a blocking call?

[octylFractal]

it's synchronized so it is potentially blocking. use StringBuilder if you don't need thread safety

[christophsturm]

oh thanks. I always mix up those two.

[christophsturm]

i just noticed i was indeed using StringBuilder, which is not synchronized, and idea complained for that. I just mixed it up here in my error report. so why does idea complain for StringBuilder.append ?

[octylFractal]

I think that's a bug on IntelliJ's part, probably already reported, where it thinks that the overriden method Appendable.append(CharSequence) throws IOException is still an IO call for the StringBuilder