NULL メッセージ (チャネルの信号終了) が、データグラムチャネルから受信されましたが、チャネルはまだ Opened 状態のままです。これは、データグラムチャネルにバグがあり、デマルチプレクサ受信ループが途中で止まったことを示しています。

Message in Japanese (日本語)

Unlocalized message

A null Message (signalling end of channel) was received from a datagram channel, but the channel is still in the Opened state. This indicates a bug in the datagram channel, and the demuxer receive loop has been prematurely stalled.

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