摘要：
问题原因：本地用的c3p0为0.9.1.2版本，版本不兼容。解决方法：maven方式：pom引用升级到c3p0-0.9.5.5，并且加入mchange-commons-java-0.2.19的依赖。lib方式：直接下载c3p0-0.9.5.5.bin.zip，解压后将c3p0-0.9.5.5lib下的c3p0-0.9.5.5.jar和mchange-commons-java-0.2.19.jar导到项目lib目录下。
问题原因：本地用的c3p0为0.9.1.2版本，版本不兼容。
解决方法：
maven方式：pom引用升级到 c3p0-0.9.5.5，并且加入 mchange-commons-java-0.2.19 的依赖。
lib方式：直接 下载c3p0-0.9.5.5.bin.zip，解压后将 c3p0-0.9.5.5lib 下的 c3p0-0.9.5.5.jar 和mchange-commons-java-0.2.19.jar导到项目lib目录下。
具体报错如下：
org.springframework.web.util.NestedServletException: Handler dispatch failed; nested exception is java.lang.AbstractMethodError: Method com/mchange/v2/c3p0/impl/NewProxyResultSet.isClosed()Z is abstractorg.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:626) org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) javax.servlet.http.HttpServlet.service(HttpServlet.java:733) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) 根本原因。 java.lang.AbstractMethodError: Method com/mchange/v2/c3p0/impl/NewProxyResultSet.isClosed()Z is abstractcom.mchange.v2.c3p0.impl.NewProxyResultSet.isClosed(NewProxyResultSet.java) org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValuesForSimpleResultMap(DefaultResultSetHandler.java:352) org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValues(DefaultResultSetHandler.java:328) org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSet(DefaultResultSetHandler.java:301) org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSets(DefaultResultSetHandler.java:194) org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:65) org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:79) org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:63) org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:325) org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156) org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109) org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:89) org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:147) org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:140) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) java.lang.reflect.Method.invoke(Method.java:483) org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:427) com.sun.proxy.$Proxy7.selectList(Unknown Source) org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:224) org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:147) org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:80) org.apache.ibatis.binding.MapperProxy$PlainMethodInvoker.invoke(MapperProxy.java:152) org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:85) com.sun.proxy.$Proxy23.selectByExampleWithBLOBs(Unknown Source) com.hithere.springmvc.dao.ItemDaoImpl.selectItemsList(ItemDaoImpl.java:22) com.hithere.springmvc.controller.ItemController.itemList(ItemController.java:29) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) java.lang.reflect.Method.invoke(Method.java:483) org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190) org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138) org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106) org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:888) org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793) org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040) 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:626) org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) javax.servlet.http.HttpServlet.service(HttpServlet.java:733) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)