某web專案在maven3.5.4下載入頁面時出現

javax.servlet.ServletException: java.lang.NoClassDefFoundError: javax/el/ExpressionFactory     at org.apache.jasper.servlet.JspServlet.service (JspServlet.java:358)     at org.eclipse.jetty.jsp.JettyJspServlet.service (JettyJspServlet.java:107)     at javax.servlet.http.HttpServlet.service (HttpServlet.java:790)     at org.eclipse.jetty.servlet.ServletHolder.handle (ServletHolder.java:800)     at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter (ServletHandler.java:1669)     at org.springframework.web.filter.OncePerRequestFilter.doFilter (OncePerRequestFilter.java:101)     at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter (ServletHandler.java:1652)     at org.eclipse.jetty.servlet.ServletHandler.doHandle (ServletHandler.java:585)     at org.eclipse.jetty.server.handler.ScopedHandler.handle (ScopedHandler.java:143)     at org.eclipse.jetty.security.SecurityHandler.handle (SecurityHandler.java:595)     at org.eclipse.jetty.server.session.SessionHandler.doHandle (SessionHandler.java:223)     at org.eclipse.jetty.server.handler.ContextHandler.doHandle (ContextHandler.java:1127)     at org.eclipse.jetty.servlet.ServletHandler.doScope (ServletHandler.java:515)     at org.eclipse.jetty.server.session.SessionHandler.doScope (SessionHandler.java:185)     at org.eclipse.jetty.server.handler.ContextHandler.doScope (ContextHandler.java:1061)     at org.eclipse.jetty.server.handler.ScopedHandler.handle (ScopedHandler.java:141)     at org.eclipse.jetty.server.Dispatcher.forward (Dispatcher.java:191)     at org.eclipse.jetty.server.Dispatcher.forward (Dispatcher.java:72)     at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel (InternalResourceView.java:168)     at org.springframework.web.servlet.view.AbstractView.render (AbstractView.java:303)     at org.springframework.web.servlet.DispatcherServlet.render (DispatcherServlet.java:1282)     at org.springframework.web.servlet.DispatcherServlet.processDispatchResult (DispatcherServlet.java:1037)     at org.springframework.web.servlet.DispatcherServlet.doDispatch (DispatcherServlet.java:980)     at org.springframework.web.servlet.DispatcherServlet.doService (DispatcherServlet.java:897)     at org.springframework.web.servlet.FrameworkServlet.processRequest (FrameworkServlet.java:970)     at org.springframework.web.servlet.FrameworkServlet.doGet (FrameworkServlet.java:861)     at javax.servlet.http.HttpServlet.service (HttpServlet.java:687)     at org.springframework.web.servlet.FrameworkServlet.service (FrameworkServlet.java:846)     at javax.servlet.http.HttpServlet.service (HttpServlet.java:790)     at org.eclipse.jetty.servlet.ServletHolder.handle (ServletHolder.java:800)     at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter (ServletHandler.java:1669)     at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal (CharacterEncodingFilter.java:197)     at org.springframework.web.filter.OncePerRequestFilter.doFilter (OncePerRequestFilter.java:107)     at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter (ServletHandler.java:1652)     at org.eclipse.jetty.servlet.ServletHandler.doHandle (ServletHandler.java:585)     at org.eclipse.jetty.server.handler.ScopedHandler.handle (ScopedHandler.java:143)     at org.eclipse.jetty.security.SecurityHandler.handle (SecurityHandler.java:577)     at org.eclipse.jetty.server.session.SessionHandler.doHandle (SessionHandler.java:223)     at org.eclipse.jetty.server.handler.ContextHandler.doHandle (ContextHandler.java:1127)     at org.eclipse.jetty.servlet.ServletHandler.doScope (ServletHandler.java:515)     at org.eclipse.jetty.server.session.SessionHandler.doScope (SessionHandler.java:185)     at org.eclipse.jetty.server.handler.ContextHandler.doScope (ContextHandler.java:1061)     at org.eclipse.jetty.server.handler.ScopedHandler.handle (ScopedHandler.java:141)     at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle (ContextHandlerCollection.java:215)     at org.eclipse.jetty.server.handler.HandlerCollection.handle (HandlerCollection.java:110)     at org.eclipse.jetty.server.handler.HandlerWrapper.handle (HandlerWrapper.java:97)     at org.eclipse.jetty.server.Server.handle (Server.java:497)     at org.eclipse.jetty.server.HttpChannel.handle (HttpChannel.java:310)     at org.eclipse.jetty.server.HttpConnection.onFillable (HttpConnection.java:245)     at org.eclipse.jetty.io.AbstractConnection$2.run (AbstractConnection.java:540)     at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob (QueuedThreadPool.java:635)     at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run (QueuedThreadPool.java:555)     at java.lang.Thread.run (Thread.java:748) Caused by: java.lang.NoClassDefFoundError: javax/el/ExpressionFactory     at org.apache.jasper.compiler.PageInfo.<init> (PageInfo.java:79)     at org.apache.jasper.compiler.Compiler.generateJava (Compiler.java:112)     at org.apache.jasper.compiler.Compiler.compile (Compiler.java:356)     at org.apache.jasper.compiler.Compiler.compile (Compiler.java:336)     at org.apache.jasper.compiler.Compiler.compile (Compiler.java:323)     at org.apache.jasper.JspCompilationContext.compile (JspCompilationContext.java:564)     at org.apache.jasper.servlet.JspServletWrapper.service (JspServletWrapper.java:357)     at org.apache.jasper.servlet.JspServlet.serviceJspFile (JspServlet.java:405)     at org.apache.jasper.servlet.JspServlet.service (JspServlet.java:349)     at org.eclipse.jetty.jsp.JettyJspServlet.service (JettyJspServlet.java:107)     at javax.servlet.http.HttpServlet.service (HttpServlet.java:790)     at org.eclipse.jetty.servlet.ServletHolder.handle (ServletHolder.java:800)     at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter (ServletHandler.java:1669)     at org.springframework.web.filter.OncePerRequestFilter.doFilter (OncePerRequestFilter.java:101)     at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter (ServletHandler.java:1652)     at org.eclipse.jetty.servlet.ServletHandler.doHandle (ServletHandler.java:585)     at org.eclipse.jetty.server.handler.ScopedHandler.handle (ScopedHandler.java:143)     at org.eclipse.jetty.security.SecurityHandler.handle (SecurityHandler.java:595)     at org.eclipse.jetty.server.session.SessionHandler.doHandle (SessionHandler.java:223)     at org.eclipse.jetty.server.handler.ContextHandler.doHandle (ContextHandler.java:1127)     at org.eclipse.jetty.servlet.ServletHandler.doScope (ServletHandler.java:515)     at org.eclipse.jetty.server.session.SessionHandler.doScope (SessionHandler.java:185)     at org.eclipse.jetty.server.handler.ContextHandler.doScope (ContextHandler.java:1061)     at org.eclipse.jetty.server.handler.ScopedHandler.handle (ScopedHandler.java:141)     at org.eclipse.jetty.server.Dispatcher.forward (Dispatcher.java:191)     at org.eclipse.jetty.server.Dispatcher.forward (Dispatcher.java:72)     at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel (InternalResourceView.java:168)     at org.springframework.web.servlet.view.AbstractView.render (AbstractView.java:303)     at org.springframework.web.servlet.DispatcherServlet.render (DispatcherServlet.java:1282)     at org.springframework.web.servlet.DispatcherServlet.processDispatchResult (DispatcherServlet.java:1037)     at org.springframework.web.servlet.DispatcherServlet.doDispatch (DispatcherServlet.java:980)     at org.springframework.web.servlet.DispatcherServlet.doService (DispatcherServlet.java:897)     at org.springframework.web.servlet.FrameworkServlet.processRequest (FrameworkServlet.java:970)     at org.springframework.web.servlet.FrameworkServlet.doGet (FrameworkServlet.java:861)     at javax.servlet.http.HttpServlet.service (HttpServlet.java:687)     at org.springframework.web.servlet.FrameworkServlet.service (FrameworkServlet.java:846)     at javax.servlet.http.HttpServlet.service (HttpServlet.java:790)     at org.eclipse.jetty.servlet.ServletHolder.handle (ServletHolder.java:800)     at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter (ServletHandler.java:1669)     at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal (CharacterEncodingFilter.java:197)     at org.springframework.web.filter.OncePerRequestFilter.doFilter (OncePerRequestFilter.java:107)     at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter (ServletHandler.java:1652)     at org.eclipse.jetty.servlet.ServletHandler.doHandle (ServletHandler.java:585)     at org.eclipse.jetty.server.handler.ScopedHandler.handle (ScopedHandler.java:143)     at org.eclipse.jetty.security.SecurityHandler.handle (SecurityHandler.java:577)     at org.eclipse.jetty.server.session.SessionHandler.doHandle (SessionHandler.java:223)     at org.eclipse.jetty.server.handler.ContextHandler.doHandle (ContextHandler.java:1127)     at org.eclipse.jetty.servlet.ServletHandler.doScope (ServletHandler.java:515)     at org.eclipse.jetty.server.session.SessionHandler.doScope (SessionHandler.java:185)     at org.eclipse.jetty.server.handler.ContextHandler.doScope (ContextHandler.java:1061)     at org.eclipse.jetty.server.handler.ScopedHandler.handle (ScopedHandler.java:141)     at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle (ContextHandlerCollection.java:215)     at org.eclipse.jetty.server.handler.HandlerCollection.handle (HandlerCollection.java:110)     at org.eclipse.jetty.server.handler.HandlerWrapper.handle (HandlerWrapper.java:97)     at org.eclipse.jetty.server.Server.handle (Server.java:497)     at org.eclipse.jetty.server.HttpChannel.handle (HttpChannel.java:310)     at org.eclipse.jetty.server.HttpConnection.onFillable (HttpConnection.java:245)     at org.eclipse.jetty.io.AbstractConnection$2.run (AbstractConnection.java:540)     at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob (QueuedThreadPool.java:635)     at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run (QueuedThreadPool.java:555)     at java.lang.Thread.run (Thread.java:748) Caused by: java.lang.ClassNotFoundException: javax.el.ExpressionFactory     at org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass (SelfFirstStrategy.java:50)     at org.codehaus.plexus.classworlds.realm.ClassRealm.unsynchronizedLoadClass (ClassRealm.java:271)     at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass (ClassRealm.java:247)     at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass (ClassRealm.java:239)     at org.apache.jasper.compiler.PageInfo.<init> (PageInfo.java:79)     at org.apache.jasper.compiler.Compiler.generateJava (Compiler.java:112)     at org.apache.jasper.compiler.Compiler.compile (Compiler.java:356)     at org.apache.jasper.compiler.Compiler.compile (Compiler.java:336)     at org.apache.jasper.compiler.Compiler.compile (Compiler.java:323)     at org.apache.jasper.JspCompilationContext.compile (JspCompilationContext.java:564)     at org.apache.jasper.servlet.JspServletWrapper.service (JspServletWrapper.java:357)     at org.apache.jasper.servlet.JspServlet.serviceJspFile (JspServlet.java:405)     at org.apache.jasper.servlet.JspServlet.service (JspServlet.java:349)     at org.eclipse.jetty.jsp.JettyJspServlet.service (JettyJspServlet.java:107)     at javax.servlet.http.HttpServlet.service (HttpServlet.java:790)     at org.eclipse.jetty.servlet.ServletHolder.handle (ServletHolder.java:800)     at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter (ServletHandler.java:1669)     at org.springframework.web.filter.OncePerRequestFilter.doFilter (OncePerRequestFilter.java:101)     at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter (ServletHandler.java:1652)     at org.eclipse.jetty.servlet.ServletHandler.doHandle (ServletHandler.java:585)     at org.eclipse.jetty.server.handler.ScopedHandler.handle (ScopedHandler.java:143)     at org.eclipse.jetty.security.SecurityHandler.handle (SecurityHandler.java:595)     at org.eclipse.jetty.server.session.SessionHandler.doHandle (SessionHandler.java:223)     at org.eclipse.jetty.server.handler.ContextHandler.doHandle (ContextHandler.java:1127)     at org.eclipse.jetty.servlet.ServletHandler.doScope (ServletHandler.java:515)     at org.eclipse.jetty.server.session.SessionHandler.doScope (SessionHandler.java:185)     at org.eclipse.jetty.server.handler.ContextHandler.doScope (ContextHandler.java:1061)     at org.eclipse.jetty.server.handler.ScopedHandler.handle (ScopedHandler.java:141)     at org.eclipse.jetty.server.Dispatcher.forward (Dispatcher.java:191)     at org.eclipse.jetty.server.Dispatcher.forward (Dispatcher.java:72)     at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel (InternalResourceView.java:168)     at org.springframework.web.servlet.view.AbstractView.render (AbstractView.java:303)     at org.springframework.web.servlet.DispatcherServlet.render (DispatcherServlet.java:1282)     at org.springframework.web.servlet.DispatcherServlet.processDispatchResult (DispatcherServlet.java:1037)     at org.springframework.web.servlet.DispatcherServlet.doDispatch (DispatcherServlet.java:980)     at org.springframework.web.servlet.DispatcherServlet.doService (DispatcherServlet.java:897)     at org.springframework.web.servlet.FrameworkServlet.processRequest (FrameworkServlet.java:970)     at org.springframework.web.servlet.FrameworkServlet.doGet (FrameworkServlet.java:861)     at javax.servlet.http.HttpServlet.service (HttpServlet.java:687)     at org.springframework.web.servlet.FrameworkServlet.service (FrameworkServlet.java:846)     at javax.servlet.http.HttpServlet.service (HttpServlet.java:790)     at org.eclipse.jetty.servlet.ServletHolder.handle (ServletHolder.java:800)     at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter (ServletHandler.java:1669)     at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal (CharacterEncodingFilter.java:197)     at org.springframework.web.filter.OncePerRequestFilter.doFilter (OncePerRequestFilter.java:107)     at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter (ServletHandler.java:1652)     at org.eclipse.jetty.servlet.ServletHandler.doHandle (ServletHandler.java:585)     at org.eclipse.jetty.server.handler.ScopedHandler.handle (ScopedHandler.java:143)     at org.eclipse.jetty.security.SecurityHandler.handle (SecurityHandler.java:577)     at org.eclipse.jetty.server.session.SessionHandler.doHandle (SessionHandler.java:223)     at org.eclipse.jetty.server.handler.ContextHandler.doHandle (ContextHandler.java:1127)     at org.eclipse.jetty.servlet.ServletHandler.doScope (ServletHandler.java:515)     at org.eclipse.jetty.server.session.SessionHandler.doScope (SessionHandler.java:185)     at org.eclipse.jetty.server.handler.ContextHandler.doScope (ContextHandler.java:1061)     at org.eclipse.jetty.server.handler.ScopedHandler.handle (ScopedHandler.java:141)     at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle (ContextHandlerCollection.java:215)     at org.eclipse.jetty.server.handler.HandlerCollection.handle (HandlerCollection.java:110)     at org.eclipse.jetty.server.handler.HandlerWrapper.handle (HandlerWrapper.java:97)     at org.eclipse.jetty.server.Server.handle (Server.java:497)     at org.eclipse.jetty.server.HttpChannel.handle (HttpChannel.java:310)     at org.eclipse.jetty.server.HttpConnection.onFillable (HttpConnection.java:245)     at org.eclipse.jetty.io.AbstractConnection$2.run (AbstractConnection.java:540)     at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob (QueuedThreadPool.java:635)     at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run (QueuedThreadPool.java:555)     at java.lang.Thread.run (Thread.java:748) [WARNING] EXCEPTION javax.servlet.ServletException: java.lang.NoClassDefFoundError: javax/el/ExpressionFactory     at org.apache.jasper.servlet.JspServlet.service (JspServlet.java:358)     at org.eclipse.jetty.jsp.JettyJspServlet.service (JettyJspServlet.java:107)     at javax.servlet.http.HttpServlet.service (HttpServlet.java:790)     at org.eclipse.jetty.servlet.ServletHolder.handle (ServletHolder.java:800)     at org.eclipse.jetty.servlet.ServletHandler.doHandle (ServletHandler.java:587)     at org.eclipse.jetty.server.handler.ScopedHandler.handle (ScopedHandler.java:143)     at org.eclipse.jetty.security.SecurityHandler.handle (SecurityHandler.java:595)     at org.eclipse.jetty.server.session.SessionHandler.doHandle (SessionHandler.java:223)     at org.eclipse.jetty.server.handler.ContextHandler.doHandle (ContextHandler.java:1127)     at org.eclipse.jetty.servlet.ServletHandler.doScope (ServletHandler.java:515)     at org.eclipse.jetty.server.session.SessionHandler.doScope (SessionHandler.java:185)     at org.eclipse.jetty.server.handler.ContextHandler.doScope (ContextHandler.java:1061)     at org.eclipse.jetty.server.handler.ScopedHandler.handle (ScopedHandler.java:141)     at org.eclipse.jetty.server.Dispatcher.forward (Dispatcher.java:191)     at org.eclipse.jetty.server.Dispatcher.error (Dispatcher.java:77)     at org.eclipse.jetty.server.handler.ErrorHandler.handle (ErrorHandler.java:91)     at org.eclipse.jetty.server.Response.sendError (Response.java:597)     at org.eclipse.jetty.server.Response.sendError (Response.java:544)     at org.eclipse.jetty.servlet.ServletHandler.doHandle (ServletHandler.java:647)     at org.eclipse.jetty.server.handler.ScopedHandler.handle (ScopedHandler.java:143)     at org.eclipse.jetty.security.SecurityHandler.handle (SecurityHandler.java:577)     at org.eclipse.jetty.server.session.SessionHandler.doHandle (SessionHandler.java:223)     at org.eclipse.jetty.server.handler.ContextHandler.doHandle (ContextHandler.java:1127)     at org.eclipse.jetty.servlet.ServletHandler.doScope (ServletHandler.java:515)     at org.eclipse.jetty.server.session.SessionHandler.doScope (SessionHandler.java:185)     at org.eclipse.jetty.server.handler.ContextHandler.doScope (ContextHandler.java:1061)     at org.eclipse.jetty.server.handler.ScopedHandler.handle (ScopedHandler.java:141)     at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle (ContextHandlerCollection.java:215)     at org.eclipse.jetty.server.handler.HandlerCollection.handle (HandlerCollection.java:110)     at org.eclipse.jetty.server.handler.HandlerWrapper.handle (HandlerWrapper.java:97)     at org.eclipse.jetty.server.Server.handle (Server.java:497)     at org.eclipse.jetty.server.HttpChannel.handle (HttpChannel.java:310)     at org.eclipse.jetty.server.HttpConnection.onFillable (HttpConnection.java:245)     at org.eclipse.jetty.io.AbstractConnection$2.run (AbstractConnection.java:540)     at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob (QueuedThreadPool.java:635)     at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run (QueuedThreadPool.java:555)     at java.lang.Thread.run (Thread.java:748) Caused by: java.lang.NoClassDefFoundError: javax/el/ExpressionFactory     at org.apache.jasper.compiler.PageInfo.<init> (PageInfo.java:79)     at org.apache.jasper.compiler.Compiler.generateJava (Compiler.java:112)     at org.apache.jasper.compiler.Compiler.compile (Compiler.java:356)     at org.apache.jasper.compiler.Compiler.compile (Compiler.java:336)     at org.apache.jasper.compiler.Compiler.compile (Compiler.java:323)     at org.apache.jasper.JspCompilationContext.compile (JspCompilationContext.java:564)     at org.apache.jasper.servlet.JspServletWrapper.service (JspServletWrapper.java:357)     at org.apache.jasper.servlet.JspServlet.serviceJspFile (JspServlet.java:405)     at org.apache.jasper.servlet.JspServlet.service (JspServlet.java:349)     at org.eclipse.jetty.jsp.JettyJspServlet.service (JettyJspServlet.java:107)     at javax.servlet.http.HttpServlet.service (HttpServlet.java:790)     at org.eclipse.jetty.servlet.ServletHolder.handle (ServletHolder.java:800)     at org.eclipse.jetty.servlet.ServletHandler.doHandle (ServletHandler.java:587)     at org.eclipse.jetty.server.handler.ScopedHandler.handle (ScopedHandler.java:143)     at org.eclipse.jetty.security.SecurityHandler.handle (SecurityHandler.java:595)     at org.eclipse.jetty.server.session.SessionHandler.doHandle (SessionHandler.java:223)     at org.eclipse.jetty.server.handler.ContextHandler.doHandle (ContextHandler.java:1127)     at org.eclipse.jetty.servlet.ServletHandler.doScope (ServletHandler.java:515)     at org.eclipse.jetty.server.session.SessionHandler.doScope (SessionHandler.java:185)     at org.eclipse.jetty.server.handler.ContextHandler.doScope (ContextHandler.java:1061)

用盡網上說的各種方法仍不得解決，忽然想起該專案改動了maven外掛版本，將其降為3.3.9得以解決！