mysql数据库连接出问题，提示超时，后来发现问题在于连接mysql数据库的jar包跟数据库版本不对应导致的，更换jar包一致就解决了。
mysql数据库连接出问题，提示超时 java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.解决办法
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