在eclipse中连接C3p0。使用的MySQL数据库。c3p0已配置。
导入的Jar包：c3p0-0.9.5.1.jar  mysql-connector-java-5.1.36-bin.jar  mchange-commons-java-0.2.3.1.jar
public class JdbcUtils {
   
   private static DataSource dataSource=null;
   static{
       dataSource= new ComboPooledDataSource("mvcapp");
   }
   
    public  static Connection getConnection() throws SQLException{
        return dataSource.getConnection();
    }
}
测试：
        @Test
    public void testGetConnection() throws SQLException {
        Connection connection=JdbcUtils.getConnection();
        System.out.println(connection);
    }
出现如下错误：java.lang.NoClassDefFoundError: com/mchange/v2/cfg/MConfig
    at com.mchange.v2.c3p0.cfg.C3P0Config.findLibraryMultiPropertiesConfig(C3P0Config.java:157)
    at com.mchange.v2.c3p0.cfg.C3P0Config.<clinit>(C3P0Config.java:143)
    at com.mchange.v2.c3p0.impl.PoolBackedDataSourceBase.<init>(PoolBackedDataSourceBase.java:54)...
     Caused by: java.lang.ClassNotFoundException: com.mchange.v2.cfg.MConfig
    at (Unknown Source)...

把你的DataSource换成ComboPooledDataSource应该就可以了

楼上正解