普元 EOSPlatform8.1GA Mysql对于长时间不处理连接会自动断开，EOS报错：CommunicationsException: The last packet successfully received from the server was 85,418,664 milliseconds ago

问题：

Mysql对于长时间不处理连接会自动断开，EOS报错：CommunicationsException: The last packet successfully received from the server was 85,418,664 milliseconds ago

Caused by: com.mysql.cj.jdbc.exceptions.CommunicationsException: The last packet successfully received from the server was 85,418,664 milliseconds ago. The last packet sent successfully to the server was 85,418,666 milliseconds ago. is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem.
at com.mysql.cj.jdbc.exceptions.SQLError.createCommunicationsException(SQLError.java:174)
at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:64)
at com.mysql.cj.jdbc.ConnectionImpl.setAutoCommit(ConnectionImpl.java:2054)
at com.mchange.v2.c3p0.impl.NewProxyConnection.setAutoCommit(NewProxyConnection.java:1059)
at org.springframework.jdbc.datasource.DataSourceTransactionManager.doBegin(DataSourceTransactionManager.java:283)
... 118 common frames omitted

解答：

在user-config.xml的配置中增加下面配置可以解决这个问题，
<configValue key="C3p0.testConnectionOnCheckin">false</configValue>
<configValue key="C3p0.testConnectionOnCheckout">true</configValue>