[Backport] [Java] Safely call onError on Subjects (#31779) #32026
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Backport of #31779
Description
If a connection is being started up and it receives the handshake response at the same time that the handshake timeout occurs the app can crash.
Customer Impact
App can crash during connection setup due to a race condition with the connection handshake.
Regression?
Risk
Small change that shouldn't affect any thing except for fixing a race.
Verification
Packaging changes reviewed?
Addresses #31491