Hi. IntelliJ gives me a warning that the a call to Jackson’s Object Mapper.writeValueAsString is an...

# intellij

[natpryce]

Hi. IntelliJ gives me a warning that the a call to Jackson’s Object Mapper.writeValueAsString is an “Inappropriate blocking method call”. Is that correct? I cannot see it doing any I/O or inter-thread communication that might block the thread.

[diesieben07]

That warning is based on a heuristic. If a method throws IOException it is determined to be blocking

[diesieben07]

Which is not always correct

[natpryce]

Right. Thanks.

[natpryce]

It throws JsonProcessingException, which is an IOException.

[diesieben07]

In this case it does not seem correct, that method throws IOException because it uses OutputStream, but that just writes to memory

[natpryce]

I’ll annotate the warning away