1.错误代码
2017-09-28 14:37:03.133:WARN:oejsh.ErrorHandler:qtp1335520301-21: EXCEPTION
org.apache.jasper.JasperException: /WEB-INF/views/include/_head.jsp (line: 1, column: 2) Page directive: illegal to have multiple occurrences of contentType with different values (old: text/html; charset=UTF-8, new: text/html;charset=UTF-8)
at org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:41)
at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:275)
at org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:107)
at org.apache.jasper.compiler.Validator$DirectiveVisitor.visit(Validator.java:135)
at org.apache.jasper.compiler.Node$PageDirective.accept(Node.java:571)
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2376)
at org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2428)
at org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2434)
at org.apache.jasper.compiler.Node$Root.accept(Node.java:464)
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2376)
at org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2428)
at org.apache.jasper.compiler.Validator$DirectiveVisitor.visit(Validator.java:101)
at org.apache.jasper.compiler.Node$IncludeDirective.accept(Node.java:635)
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2376)
at org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2428)
at org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2434)
at org.apache.jasper.compiler.Node$Root.accept(Node.java:464)
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2376)
at org.apache.jasper.compiler.Validator.validateDirectives(Validator.java:1813)
at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:196)
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:585)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:363)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340)
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:835)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:583)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:566)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1158)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:511)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1090)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.Dispatcher.forward(Dispatcher.java:199)
at org.eclipse.jetty.server.Dispatcher.error(Dispatcher.java:79)
at org.eclipse.jetty.server.handler.ErrorHandler.handle(ErrorHandler.java:93)
at org.eclipse.jetty.server.Response.sendError(Response.java:572)
at org.eclipse.jetty.server.Response.sendError(Response.java:512)
at javax.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:167)
at com.alibaba.druid.support.http.WebStatFilter$StatHttpServletResponseWrapper.sendError(WebStatFilter.java:341)
at org.springframework.web.servlet.resource.ResourceHttpRequestHandler.handleRequest(ResourceHttpRequestHandler.java:236)
at org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter.handle(HttpRequestHandlerAdapter.java:51)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
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:835)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1685)
at com.alibaba.druid.support.http.WebStatFilter.doFilter(WebStatFilter.java:123)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1668)
at com.lyd.common.web.filter.HttpContextFilter.doFilter(HttpContextFilter.java:25)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1668)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:85)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1668)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:581)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1158)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:511)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1090)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:213)
at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:109)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:119)
at org.eclipse.jetty.server.Server.handle(Server.java:517)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:308)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:242)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:273)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95)
at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:75)
at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceAndRun(ExecuteProduceConsume.java:213)
at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:147)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:654)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:572)
at java.lang.Thread.run(Thread.java:745)
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2.疑惑
代码是没有错的，因为在其它页面调用没有出错过。那么是主文件出错了，看了一下刚写的页面也没有错误，到底怎么回事？
3.分析
head文件
404文件
原来是包含页面与被包含页面的@page指令里面的contentType不一致，仔细检查两个文件第一行的 @page，包含页面的是：
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>被包含页面：
<%@ page language="java" contentType="text/html;charset=utf-8" %>果然contentType里面内容不一样，把两个文件第一行的@page内容改为一致，再执行程序，运行通过。
