java.lang.IllegalStateException: Mailbox is in state CLOSED, but is required to be in state OPEN for put operations

[email protected] Sat, 06 Feb 2021 23:19:27 -0800

程序时常会报：java.lang.IllegalStateException: Mailbox is in state CLOSED, but is 
required to be in state OPEN for put operations。 请问原因是什么？以及如何避免。
[email protected]

java.lang.IllegalStateException: Mailbox is in state CLOSED, but is required to be in state OPEN for put operations

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