新人求帮助，java页面错误信息求解释啊
type Exception report

message 

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

exception 

org.apache.jasper.JasperException: /showCart.jsp(7,0) The value for the useBean class attribute bean.ShopCart is invalid.
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:40)
org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:407)
org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:148)
org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1175)
org.apache.jasper.compiler.Node$UseBean.accept(Node.java:1117)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2166)
org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2216)
org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2222)
org.apache.jasper.compiler.Node$Root.accept(Node.java:457)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2166)
org.apache.jasper.compiler.Generator.generate(Generator.java:3322)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:199)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:296)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:277)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:265)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:564)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:302)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
shopcart.ShowCartServlet.doPost(ShowCartServlet.java:36)
javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
shopcart.ShoppingServlet.doPost(ShoppingServlet.java:45)
javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
filter.CharactorFilter.doFilter(CharactorFilter.java:25)


note The full stack trace of the root cause is available in the Apache Tomcat/5.5.25 logs.


------解决方案--------------------
/showCart.jsp(7,0) The value for the useBean class attribute bean.ShopCart is invalid.

showCart.jsp 文件的7 行 0列是错的
useBean类的属性bean.ShopCart的值是无效的。
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.aiyiweb.com/java-web/317.html