我打的是书上的原题目。可是运行不起来,
总是出现这样的错误,程序应该没得问题。服务器可以运行其他的JSP文件。
大家帮忙看一下,是什么问题。已经调了好几次了都这样。description The server encountered an internal error () that prevented it from fulfilling this request.exception org.apache.jasper.JasperException: Unable to load class for JSP
org.apache.jasper.JspCompilationContext.load(JspCompilationContext.java:599)
org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:137)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:314)
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)
root cause java.lang.ClassNotFoundException: org.apache.jsp.useBean_jsp
java.net.URLClassLoader$1.run(URLClassLoader.java:200)
java.security.AccessController.doPrivileged(Native Method)
java.net.URLClassLoader.findClass(URLClassLoader.java:188)
org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:131)
org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:63)
org.apache.jasper.JspCompilationContext.load(JspCompilationContext.java:597)
org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:137)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:314)
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)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.26 logs.
--------------------------------------------------------------------------------
总是出现这样的错误,程序应该没得问题。服务器可以运行其他的JSP文件。
大家帮忙看一下,是什么问题。已经调了好几次了都这样。description The server encountered an internal error () that prevented it from fulfilling this request.exception org.apache.jasper.JasperException: Unable to load class for JSP
org.apache.jasper.JspCompilationContext.load(JspCompilationContext.java:599)
org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:137)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:314)
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)
root cause java.lang.ClassNotFoundException: org.apache.jsp.useBean_jsp
java.net.URLClassLoader$1.run(URLClassLoader.java:200)
java.security.AccessController.doPrivileged(Native Method)
java.net.URLClassLoader.findClass(URLClassLoader.java:188)
org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:131)
org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:63)
org.apache.jasper.JspCompilationContext.load(JspCompilationContext.java:597)
org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:137)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:314)
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)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.26 logs.
--------------------------------------------------------------------------------
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楼主【tiger5858】截止到2008-07-12 12:12:23的历史汇总数据(不包括此帖):
发帖的总数量:1 发帖的总分数:20 每贴平均分数:20
回帖的总数量:1 得分贴总数量:0 回帖的得分率:0%
结贴的总数量:0 结贴的总分数:0
无满意结贴数:0 无满意结贴分:0
未结的帖子数:1 未结的总分数:20
结贴的百分比:0.00 % 结分的百分比:0.00 %
无满意结贴率:---------------------无满意结分率:---------------------
如何结贴请参考这里:http://topic.csdn.net/u/20080501/09/ef7ba1b3-6466-49f6-9d92-36fe6d471dd1.html
空类异常 检查一下你的Bean 里面是不是有变量未定义
package tom.jiafei;
public class Triangle{
double sideA=-1,sideB=-1,sideC=-1,area=-1;
boolean triangle;
public void setSideA(double a){
sideA=a;
}
public double getSideA(){
return sideA;
}
public void setSideB(double b){
sideB=b;
}
public double getSideB(){
return sideB;
}
public void setSideC(double c){
sideC=c;
}
public double getSideC(){
return sideC;
}
public double getArea(){
double p=(sideA+sideB+sideC)/2.0;
if(triangle)
area=Math.sqrt(p*(p-sideA)*(p-sideB)*(p-sideC));
return area;
}
public boolean isTriangle(){
if(sideA<sideB+sideC&&sideB<sideA+sideC&&sideC<sideA+sideB)
triangle=true;
else
triangle=false;
return triangle;
}
}
<%@ page contentType="text/html; charset=GB2312" %>
<%@ page import ="tom.jiafei.Triangle" %> <jsp:useBean id="triangle" class="tom.jiafei.Triangle" scope="page"/> <html>
<body > <font size=2>
<form action="" method="post">
<P>input three:
<br> bian A:<input type=text name="sideA" value=0>
bian B:<input type=text name="sideA" value=0>
bian C:<input type=text name="sideA" value=0>
<input type="submit" value="ok">
</form><jsp:setProperty name="triangle" property="*"/>
<p>three are:
<br> bian A:<jsp:getProperty name="triangle" property="sideA"/>
bian B:<jsp:getProperty name="triangle" property="sideB"/>
bian C:<jsp:getProperty name="triangle" property="sideC"/>
<p>is true?
<jsp:getProperty name="triangle" property="triangle"/>
<p> area:<jsp:getProperty name="triangle" property="area"/>
</font></body></html>
我的问题已经解决了,在自定义的一个包里面把java文件编译为.class就可以了··不知道你的情况是不是跟我一样··
bian A: <input type=text name="sideA" value=0>
bian B: <input type=text name="sideA" value=0>
bian C: <input type=text name="sideA" value=0>
=====》》》》
bian A: <input type=text name="sideA" value=0>
bian B: <input type=text name="sideB" value=0>
bian C: <input type=text name="sideC" value=0>