mysql數據庫連接出問題，提示超時，后來發現問題在於連接mysql數據庫的jar包跟數據庫版本不對應導致的，更換jar包一致就解決了。
mysql數據庫連接出問題，提示超時 java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.解決辦法
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報錯： Could not open JDBC Connection for transaction; nested exception is java.sql.SQLException: An attempt by a client to checkout a Connection has timed out. 數據庫連接超時
log報錯： Caused by: java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.
Caused by: org.hibernate.exception.GenericJDBCException: Could not open connection；Caused by: java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.
配置c3p0連接池出現錯誤：java.sql.SQLException: An attempt by a client to checkout a Connection has timed
c3p0連接錯誤 An attempt by a client to checkout a Connection has timed out.
Could not obtain connection to query metadata : An attempt by a client to checkout a Connection has timed out.]
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c3p0出現 An attempt by a client to checkout a Connection has timed out
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