Caused by: java.sql.SQLException: Couldn't perform the operation getAutoCommit: You can't perform any operations on this connection. It has been
on this connection. It has been automatically closed by Pro ...
原文：nested exception is com.mongodb.MongoWaitQueueFullException: Too many operations are already waiting for a connection. Max number of operations (maxWaitQueueSize) of 500 has been exceeded.
...
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