一个Unable to compile class for JSP错误?
我用的是eclipse(3.2)+myeclipse(5.1)
jdk(1.4.2_04)
tomcat(5.0.28)

jsp文件放在WebRoot下,java文件放在src的cn.com.shoppingonline包中,
.class文件放在classes的cn.com.shoppingonline包中.

其中一个left.jsp代码如下:
<%@ page contentType= "text/html;charset=UTF-8 " language= "java " %>
<%@ page import = "cn.com.shoppingonline.* " %>
<%@ page import = "java.util.* " %>

<%
List sortList = (List)session.getAttribute(Constants.SORT_LIST_KEY);
Sort sort = null;
%>


运行这个jsp文件报如下错误:
HTTP Status 500 -

--------------------------------------------

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: Unable to compile class for JSP

An error occurred at line: 5 in the jsp file: /left.jsp
Generated servlet error:
D:\jakarta-tomcat-5.0.28\work\Catalina\localhost\ShoppingOnline\org\apache\jsp\left_jsp.java:49: cannot access cn.com.shoppingonline.Constants


An error occurred at line: 5 in the jsp file: /left.jsp
Generated servlet error:
bad class file: D:\jakarta-tomcat-5.0.28\webapps\ShoppingOnline\WEB-INF\classes\cn\com\shoppingonline\Constants.class
class file has wrong version 49.0, should be 48.0
Please remove or make sure it appears in the correct subdirectory of the classpath.
List sortList = (List)session.getAttribute(Constants.SORT_LIST_KEY);
^
1 error


org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:84)
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:332)
org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:412)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:472)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:451)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:439)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:511)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:295)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)


note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logs.


--------------------------------------------

Apache Tomcat/5.0.28

请各位高手帮我解决一下,非常感谢!!!!!!!!!!!!!!

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解答好了我会在bbs上给分的.

[解决办法]
class file has wrong version 49.0, should be 48.0

应该是JDK版本问题

低版本的jre 不能运行高版本的
JDK编译的class

看看你是不是有这种情况
我的异常网推荐解决方案：The server encountered an internal error () that prevented it from fulfilling this request.,http://www.myexception.cn/java-web/317.html
我的异常网推荐解决方案：org.apache.jasper.JasperException: Unable to compile class,http://www.myexception.cn/j2ee/2308.html