Hi @Joshua_Wang
Welcome to the community!!
It could be very helpful if you could provide a detailed log for the connection to the data base. Also, if you share the version of MongoDB and Java when you are trying to make the connection.
Also, could you please check the maxIdleTime for the connection you are trying to establish as “prematurely end of stream” occurs when the connection pool is full
Reference Doc: maxIdleTime
Regards
Aasawari