maven+springmvc出現：java.sql.SQLException: Unknown system variable 'query_cache_size'

連接mysql時一直出現以下的錯誤：

 

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.transaction.CannotCreateTransactionException: Could not open JDBC Connection for transaction; nested exception is java.sql.SQLException: Connections could not be acquired from the underlying database!
	org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:982)
	org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
	org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)




然后就將“

Could not open JDBC Connection for transaction; nested exception is java.sql.SQLException: Connections could not be acquired from the underlying database!

” 當做問題的根源去搜索答案（當然，一搜發現這種錯誤還是挺多的）但是並不是我想要的答案

后來看到控制台的信息：
java.sql.SQLException: Unknown system variable 'query_cache_size'
原來這才是問題的根源所在！！！

原因是mysql驅動的版本號不匹配！！！（這篇博客簡直是救我於水深火熱之中）
直接抄過來了
如果mysql驅動版本號不匹配的話會出現：
java.sql.SQLException: Unknown system variable 'query_cache_size' 
java.sql.SQLException: Unknown system variable 'tx_read_only' 
java.sql.SQLException: Unknown system variable 'language'

解決辦法，到maven依賴查詢 去找到你安裝的mysql的版本對應的驅動版本號的配置

解決了這問題，又出現時區的問題，woc！！！

The server time zone value 'Öйú±ê׼ʱ¼ä' is unrecognized or represents more than one time zone.

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