问题

线上报错

exception=com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Communications link failure during commit(). Transaction resolution unknown.
	at sun.reflect.GeneratedConstructorAccessor400.newInstance(Unknown Source)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
	at com.mysql.jdbc.Util.getInstance(Util.java:408)

原因

经查看代码&查询资料，发现在该代码方法上有个@Transactional,另外该接口请求延时较高，达8s

故问题点在于

• 查询方法不应加事务
• 依赖的三方延时高，添加缓存