Receiver class com.mchange.v2.c3p0.impl.NewProxyResultSet does not define or inherit an implementation of the resolved method 'abstract boolean isClosed()' of interface java.sql.ResultSet.] with root cause

检查一下 pom.xml 中的 c3p0 依赖是否存在或者版本是否太低

注意高版本的不再是

<dependency>
    <groupId>c3p0</groupId>
    <artifactId>c3p0</artifactId>
    <version>0.9.1.2</version>
</dependency>

而是（注意 groupId 的变化）：

<dependency>
    <groupId>com.mchange</groupId>
    <artifactId>c3p0</artifactId>
    <version>0.9.5.5</version>
</dependency>