It is specific to blocking APIs, as per the page: > Examples are legacy RDBMS drivers or messaging APIs, and the underlying reason is typically that (network)

It is specific to blocking APIs, as per the page: > Examples are legacy RDBMS drivers or messaging APIs, and the underlying reason is typically that (network) I/O occurs under the covers The issue with async/await is that APIs need to be extended with their async counterparts. If they don't, then you have to be sure not to invoke blocking calls. Java won't have this issue as the runtime will take care of preemption.