1、首先要检查配置文件是否有问题：连接URL格式出现了问题(Connection conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/XX","root","XXXX")

<?xml version="1.0" encoding="UTF-8"?>

<c3p0-config>
    <default-config>
        <property name="driverClass">com.mysql.jdbc.Driver</property>
        <property name="jdbcUrl">jdbc:mysql://localhost:3306/test02?useUnicode=true&amp;characterEncoding=utf8&amp;useSSL=true</property>
        <property name="user">root</property>
        <property name="password">123123</property>

        <property name="acquireIncrement">5</property>
        <property name="initialPoolSize">10</property>
        <property name="minPoolSize">5</property>
        <property name="maxPoolSize">20</property>
    </default-config>
</c3p0-config>

 

2 、检查配置文件c3p0-config.xml的位置

Java项目在/src目录下
web项目在/src/main/resources目录下

 

3 、检查Buildpath中没有加入合适的mysql_jdbc驱动
项目名上点击右键—>Build Path