DriverManager.getConnection (url, username, password) can't connect to SQLSERVER.

after the program service is started, the sqlserver database can not be connected, but if you look at it the next morning, you will find that the code cannot be connected, and the code will not go when it comes to DriverManager.getConnection (url, username, password). There is no log output, no error information reported in the background, and the program interface is also stuck there directly, but there is no problem in the development tools. Please give me some advice

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Java sqlserver
Mar.23,2021

try.catch. Why don't you give it a try? Catch an exception and log it, for example 

 

 most of the threads are stuck in the network IO. 


 you can view the thread stack on the server through  jstack . It is clearer to see what this thread is doing.

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e47a0d-44c45.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e47a0d-44c45.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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