学习SSM框架时，使用pagehelper插件时遇到的问题

模拟获取页码各类信息问题

先上模拟获取页码信息代码图：

运行之后：

代码报错如下：.

org.springframework.web.util.NestedServletException: Handler dispatch failed; nested exception is java.lang.AbstractMethodError: Method com/mchange/v2/c3p0/impl/NewProxyResultSet.isClosed()Z is abstract

	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1006)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:974)
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:866)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:686)
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:851)
	at org.springframework.test.web.servlet.TestDispatcherServlet.service(TestDispatcherServlet.java:71)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:791)
	at org.springframework.mock.web.MockFilterChain$ServletFilterProxy.doFilter(MockFilterChain.java:166)
	at org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:133)
	at org.springframework.test.web.servlet.MockMvc.perform(MockMvc.java:182)

问题出在c3p0版本问题，只要将pom.xml中的依赖设置改一下即可，将c3p0换成如下版本：

     <!-- https://mvnrepository.com/artifact/com.mchange/c3p0 -->
		<dependency>
		    <groupId>com.mchange</groupId>
		    <artifactId>c3p0</artifactId>
		    <version>0.9.5.2</version>
		</dependency>

改掉之后再运行

运行成功

上述报错原因可能阐述的不够清楚，但问题已得到解决！