本文主要是介绍BD错误集锦7——在集成Spring MVC + MyBtis时使用c3p0作为数据库时报错Method com/mchange/v2/c3p0/impl/NewProxyPreparedStatem，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
异常信息如下：
Type Exception ReportMessage Handler dispatch failed; nested exception is java.lang.AbstractMethodError: Method com/mchange/v2/c3p0/impl/NewProxyPreparedStatement.isClosed()Z is abstractDescription The server encountered an unexpected condition that prevented it from fulfilling the request.Exception
org.springframework.web.util.NestedServletException: Handler dispatch failed; nested exception is java.lang.AbstractMethodError: Method com/mchange/v2/c3p0/impl/NewProxyPreparedStatement.isClosed()Z is abstractorg.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:978)org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)javax.servlet.http.HttpServlet.service(HttpServlet.java:635)org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)javax.servlet.http.HttpServlet.service(HttpServlet.java:742)org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)Root Cause
java.lang.AbstractMethodError: Method com/mchange/v2/c3p0/impl/NewProxyPreparedStatement.isClosed()Z is abstractcom.mchange.v2.c3p0.impl.NewProxyPreparedStatement.isClosed(NewProxyPreparedStatement.java)org.apache.ibatis.executor.BaseExecutor.closeStatement(BaseExecutor.java:285)org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:65)org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:326)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:83)org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148)org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141)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:497)org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:433)com.sun.proxy.$Proxy14.selectList(Unknown Source)org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:230)org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:139)org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:76)org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:59)com.sun.proxy.$Proxy17.findAll(Unknown Source)com.yuan.service.impl.YuanUserServiceImpl.findAll(YuanUserServiceImpl.java:18)com.yuan.controller.YuanTestController.hello(YuanTestController.java:20)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:497)org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221)org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136)org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:114)org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963)org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)javax.servlet.http.HttpServlet.service(HttpServlet.java:635)org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)javax.servlet.http.HttpServlet.service(HttpServlet.java:742)org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)Note The full stack trace of the root cause is available in the server logs.
经过查找，发现是c3p0 jar包版本差异导致的。
原来的版本
<dependency><groupId>c3p0</groupId><artifactId>c3p0</artifactId><version>0.9.1.2</version></dependency>修改zhi'之后的版本
<dependency><groupId>com.mchange</groupId><artifactId>c3p0</artifactId><version>0.9.5.2</version></dependency>
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