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ChannelBuilder  will create an instance of each configured callback handler using the default constructor. For mechanisms without a callback handler override, the existing default callback handlers (SaslServerCallbackHandler/SaslClientCallbackHandler) will be created once for each mechanism in ChannelBuilder, instead of per-connection. This enables callback handlers using external authentication servers to cache credentials or reuse connections if required. SaslClientCallbackHandler will be modified to obtain Subject using Subject.getSubject(AccessController.getContext()) to avoid the current per-connection state.

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