跳转失败白屏 看着老师的代码一步一步敲得 我还重复的看了好多遍

java.lang.reflect.InvocationTargetException

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:498)

at com.imooc.icake.global.GlobalController.service(GlobalController.java:49)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

at com.imooc.icake.global.EncodingFilter.doFilter(EncodingFilter.java:36)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)

at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:543)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)

at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:688)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)

at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:609)

at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)

at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:818)

at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1623)

at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)

at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)

at java.lang.Thread.run(Thread.java:748)

Caused by: java.lang.NoSuchMethodError: net.sf.jsqlparser.statement.select.PlainSelect.getGroupBy()Lnet/sf/jsqlparser/statement/select/GroupByElement;

at com.github.pagehelper.parser.CountSqlParser.isSimpleCount(CountSqlParser.java:259)

at com.github.pagehelper.parser.CountSqlParser.sqlToCount(CountSqlParser.java:238)

at com.github.pagehelper.parser.CountSqlParser.getSmartCountSql(CountSqlParser.java:197)

at com.github.pagehelper.dialect.AbstractHelperDialect.getCountSql(AbstractHelperDialect.java:78)

at com.github.pagehelper.PageHelper.getCountSql(PageHelper.java:78)

at com.github.pagehelper.util.ExecutorUtil.executeAutoCount(ExecutorUtil.java:130)

at com.github.pagehelper.PageInterceptor.count(PageInterceptor.java:150)

at com.github.pagehelper.PageInterceptor.intercept(PageInterceptor.java:97)

at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:61)

at com.sun.proxy.$Proxy17.query(Unknown Source)

at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:147)

at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:140)

at org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:147)

at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:80)

at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:58)

at com.sun.proxy.$Proxy22.selectAll(Unknown Source)

at com.imooc.icake.biz.impl.CakeBizImpl.getAll(CakeBizImpl.java:51)

at com.imooc.icake.controller.CakeController.list(CakeController.java:36)

... 30 more

public void list(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
   String pageNum=request.getParameter("pageNum");
   if (pageNum==null) pageNum = "1";
   PageHelper.startPage(Integer.parseInt(pageNum),20);
   List<Cake> list = cakeBiz.getAll();
   PageInfo pageInfo = PageInfo.of(list);
   request.setAttribute("pageInfo", pageInfo);
   request.getRequestDispatcher("/WEB-INF/pages/admin/cake_list.jsp").forward(request, response);
}