升级到Java 1.8引起问题

Question

我正在尝试升级我当前以1.6至1.8运行的Java项目，但是该程序在我去http：//http：//localhost：8080/myproject/login.jsp时均未汇总。 - 我遇到了错误。

我正在使用Eclipse Luna，然后将Java_home更改为1.8，Eclipse项目面更改为1.8，并更新了Javax.Servlet-api = 3.1.0。

堆栈跟踪

springframework.web.util.NestedServletException: Request processing failed; nested exception is org.apache.tiles.impl.CannotRenderException: ServletException including path '/WEB-INF/jsp/template/noLayout.jsp'.
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:943) ~[spring-webmvc-4.0.0.RELEASE.jar:4.0.0.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:822) ~[spring-webmvc-4.0.0.RELEASE.jar:4.0.0.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:735) ~[servlet-api-3.0.jar:na]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:807) ~[spri
Caused by: org.apache.tiles.impl.CannotRenderException: ServletException including path '/WEB-INF/jsp/template/noLayout.jsp'.
at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:692) ~[tiles-core-2.2.2.jar:2.2.2]
at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:644) ~[tiles-core-2.2.2.jar:2.2.2]
at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:627) ~[tiles-core-2.2.2.jar:2.2.2]
at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:321) ~[tiles-core-2.2.2.jar:2.2.2]
at org.springframework.web.servlet.view.tiles2.TilesView.renderMergedOutputModel(TilesView.java:88) ~[spring-webmvc-4.0.0.RELEASE.jar:4.0.0.RELEASE]
at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:266) ~[spring-webmvc-4.0.0.RELEASE.jar:4.0.0.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1225) ~[spring-webmvc-4.0.0.RELEASE.jar:4.0.0.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1012) ~[spring-webmvc-4.0.0.RELEASE.jar:4.0.0.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959) ~[spring-webmvc-4.0.0.RELEASE.jar:4.0.0.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:876) ~[spring-webmvc-4.0.0.RELEASE.jar:4.0.0.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:931) ~[spring-webmvc-4.0.0.RELEASE.jar:4.0.0.RELEASE]
... 65 common frames omitted
Caused by: org.apache.tiles.util.TilesIOException: ServletException including path '/WEB-INF/jsp/template/noLayout.jsp'.
at org.apache.tiles.servlet.context.ServletUtil.wrapServletException(ServletUtil.java:243) ~[tiles-servlet-2.2.2.jar:2.2.2]
at org.apache.tiles.servlet.context.ServletTilesRequestContext.forward(ServletTilesRequestContext.java:243) ~[tiles-servlet-2.2.2.jar:2.2.2]
at org.apache.tiles.servlet.context.ServletTilesRequestContext.dispatch(ServletTilesRequestContext.java:222) ~[tiles-servlet-2.2.2.jar:2.2.2]
at org.apache.tiles.renderer.impl.TemplateAttributeRenderer.write(TemplateAttributeRenderer.java:44) ~[tiles-core-2.2.2.jar:2.2.2]
at org.apache.tiles.renderer.impl.AbstractBaseAttributeRenderer.render(AbstractBaseAttributeRenderer.java:106) ~[tiles-core-2.2.2.jar:2.2.2]
at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:670) ~[tiles-core-2.2.2.jar:2.2.2]
at org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:690) ~[tiles-core-2.2.2.jar:2.2.2]
... 75 common frames omitted
Caused by: org.apache.jasper.JasperException: PWC6033: Error in Javac compilation for JSP
PWC6199: Generated servlet error:
string:///noLayout_jsp.java:7: cannot access java.lang.Object
bad class file: javalangObject.class(javalang:Object.class)
class file has wrong version 52.0, should be 50.0
Please remove or make sure it appears in the correct subdirectory of the classpath*.

nolayout.jsp

  <% response.setHeader("Cache-Control", "no-store, private, must-revalidate, max-stale=0, post-check=0, pre-check=0"); //Forces caches to obtain a new copy of the page from the origin server
response.setHeader("Pragma", "no-cache"); //HTTP 1.0 backward compatibility 
response.setDateHeader("Expires", 0); //Causes the proxy cache to see the page as "stale"
%><%@ page isELIgnored="false"%><!doctype html>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%><%@ taglib uri="http://tiles.apache.org/tags-tiles" prefix="tiles"%>
<html>
 <head>  
  <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">  
<link href="${pageContext.request.contextPath}/css/base.css" rel="stylesheet" type="text/css">

我正在使用常春藤进行依赖性管理

我从

瓷砖版本2.2，Spring 4.0和Jetty

Answer 1

一种可能的解决方案是为org.apache.jasper.servlet.JspServlet（tomcat-home/conf/conf/web.xml）定义compilerSourceVM和compilerTargetVM

这样：

 <servlet>
        <servlet-name>jsp</servlet-name>
        <servlet-class>org.apache.jasper.servlet.JspServlet</servlet-class>
        <init-param>                                   
            <param-name>compilerSourceVM</param-name>
            <param-value>1.8</param-value>
        </init-param>
        <init-param>
            <param-name>compilerTargetVM</param-name>
            <param-value>1.8</param-value>
        </init-param>                                   
    </servlet>

此配置定义了Jasper的编译器版本。

有关更多信息，请参阅tomcat实现的配置属性，例如tomcat 7参考文档

您也可以阅读此帖子，其中包含有关如何定义Jasper编译器版本Jasper编译器版本config

Answer 2

string:///noLayout_jsp.java:7: cannot access java.lang.Object
bad class file: javalangObject.class(javalang:Object.class)
class file has wrong version 52.0, should be 50.0

用于处理JSP的编译器似乎仍然是Java 6，但被Java 8的系统罐喂食。您是从Eclipse启动应用程序还是作为独立应用程序运行时？如果是前者，请确保您还将JRE系统库（项目的属性 -> Java构建路径 -> JRE System库）设置为Java 8.仅将所有内容设置为Java 8中的Java Compiler设置中的所有内容就不够了。如果是字母，请检查您的JSP配置，如果仍然剩下一些指向Java 6二进制文件的旧的配置。