升級到Java 1.8會導致問題

Question

我正在嘗試將運行在1.6到1.8上的當前Java項目升級，但是當我進入http：// localhost：8080 / MyProject / login.jsp時，程序可以很好地進行編譯-我遇到了錯誤。

我正在使用Eclipse Luna，並將java_HOME更改為1.8，並將Eclipse項目方面更改為1.8，並更新了javax.servlet-api = 3.1.0。

堆棧跟蹤

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: java\lang\Object.class(java\lang: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">

我正在使用常春藤進行依賴性管理

我從

Tiles版本2.2，Spring 4.0和Jetty

Answer 1

一種可能的解決方案是為org.apache.jasper.servlet.JspServlet （tomcat-home / conf / web.xml）定義compilerSourceVM和compilerTargetVM 。

像這樣：

 <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>

此配置定義了jasper的編譯器版本。

有關更多信息，請參見您的tomcat實現的配置屬性，例如Tomcat 7參考文檔

您也可以閱讀這篇文章，以及有關如何定義jasper編譯器版本的相關信息Jasper編譯器版本配置

Answer 2

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

用於處理JSP的編譯器似乎仍然是Java 6，但受Java 8的系統罐的困擾。您是從Eclipse啟動應用程序，還是將其作為獨立應用程序運行？ 如果是前者，請確保還將JRE系統庫（項目屬性-> Java Build Path-> JRE系統庫）設置為Java8。僅在Java編譯器設置中將所有內容設置為Java 8是不夠的。 如果這是字母，請檢查您的JSP配置，是否還有舊版本指向Java 6二進制文件。