c3p0连接mysql出现错误_cannotacquireresourceex连接出错mysql

工具和环境

ubuntu16.0.4

idea17

mysql5.7

c3p0 0.9.5.2

mysql-connector-java

主要的报错句子：

Caused by: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is java.sql.SQLException: Connections could not be acquired from the underlying database!

Caused by: java.sql.SQLException: Connections could not be acquired from the underlying database!

Caused by: com.mchange.v2.resourcepool.CannotAcquireResourceException: A ResourcePool could not acquire a resource from its primary factory or source.

Caused by: java.sql.SQLException: Access denied for user 'linyc'@'localhost' (using password: YES)

原因：

c3p0.properties配置文件中的属性名前要加c3p0

我早上用的是windows系统的idea不加c3p0前缀依然正确，但晚上用了ubuntu的idea配置c3p0配置文件时不加前缀就出问题了。

参考：https://blog.csdn.net/zhoucheng05_13/article/details/53352003