SSM整合 运行报Handler dispatch failed； nested exception is java.lang.AbstractMethodError: Method com/mcha

Posted 2021-08-09 似水流年，是谁苍白了等待

今天在整合SSM的时候，在运行过程中出现了如下错误:

 

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
	org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1055)
	org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)
	org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
	org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
	org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
	org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)

在整合过程中用到了c3p0 JDBC连接池，因为c3p0有自动回收空闲连接功能，出现这个错误解决过程中查资料说是引入的依赖版本太低，引入的版本为：

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

当将这个版本改为更高版本的时候找不到，爆红，最后groupId 中的c3p0改为com.mchange，改为如下依赖，问题解决：

<dependency>
    <groupId>com.mchange</groupId>
    <artifactId>c3p0</artifactId>
    <version>0.9.5.2</version>
</dependency>