beans运行出错

type Exception report

message

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

exception

org.apache.jasper.JasperException: /useBeans.jsp(5,0) The value for the useBean class attribute circle is invalid.
	org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:510)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:375)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

root cause

org.apache.jasper.JasperException: /useBeans.jsp(5,0) The value for the useBean class attribute circle is invalid.
	org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:39)
	org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:405)
	org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:146)
	org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1174)
	org.apache.jasper.compiler.Node$UseBean.accept(Node.java:1116)
	org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2163)
	org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2213)
	org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2219)
	org.apache.jasper.compiler.Node$Root.accept(Node.java:456)
	org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2163)
	org.apache.jasper.compiler.Generator.generate(Generator.java:3304)
	org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:198)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:295)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:276)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:264)
	org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:563)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:303)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

note The full stack trace of the root cause is available in the Apache Tomcat/5.5.16 logs.

Apache Tomcat/5.5.16


这个是运行的页面，哪里错了啊　

exception

org.apache.jasper.JasperException: /useBeans.jsp(5,0) The value for the useBean class attribute circle is invalid.
root cause 
org.apache.jasper.JasperException: /useBeans.jsp(5,0) The value for the useBean class attribute circle is invalid
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.16 logs.

package my;
import java.io.*;
public class Circle
{int radius ;
public Circle()
{radius=1;
}
public int getRadius()
{return radius;
}
public void setRadius(int newRadius)
{radius=newRadius;
}
public double circleArea()
{return Math.PI*radius*radius;
}
public double circleLength()
{return 2.0*Math.PI*radius;
}

}

你必须把你编译过的包放到虚拟目录\WEB-INF\classes\包名称\目录下,估计你是没有建立以包名命名的文件夹

[此贴子已经被作者于2006-3-20 21:46:52编辑过]

因为程序中已经有这样的一句话了<jsp:useBean id="girl" class="my.circle" scope="page" >
</jsp:useBean>，表明已经import了！！因为java文件中定义了包名，所以要建个文件夹来引用！！
ps:我也是新手！

[此贴子已经被作者于2006-3-21 22:44:31编辑过]

这个是注册的beans
package my;
import java.sql.*;
public class Register
{String logname="",
password="",
sex="",age="",
email="",
phone="",
address="",
message="";
String backNews;
Connection con;
Statement sql;
ResultSet rs;
public Register()
{try{Class.forName("sun.jdbc.odbc.jdbcodbcDriver");}
catch(ClassNotFoundException e){}
}
public void setLogname(String name)
{logname=name;
}
public String getLogname()
{return logname;
}
public void setAge(String n)
{age=n;
}
public String getAge()
{return age;
}
public void setSex(String s)
{sex=s;
}
public String getSex()
{return sex;
}
public void setPassword(String pw)
{password=pw;
}
public String getPassword()
{return password;
}
public void setEmail(String em)
{email=em;
}
public String getEmail()
{return email;
}
public void setPhone(String ph)
{phone=ph;
}
public String getPhone()
{return phone;
}
public void setAddress(String ad)
{address=ad;
}
public String getAddress()
{return address;
}
public String getMessage()
{return message;
}
public void setMessage(String m)
{message=m;
}
public String getBackNews()
{return backNews;
}
public void setBackNews(String s)
{backNews=s;
}
public void addItem()
{try{
Connection con=DriverManager.getConnection("jdbc:odbc:friend","","");
sql=con.createStatement();
if(phone.length()==0)
{phone="wu";
}
if(email.length()==0)
{email="wu"; }
if(address.length()==0)
{address="wu"; }
if(message.length()==0)
{message="wu"; }
String s=
"'"+logname+"'"+","+"'"+password+"'"+","+"'"+sex+"'"+","+
"'"+age+"'"+","+"'"+phone+"'"+","+"'"+email+"'"+","+
"'"+address+"'"+"'"+"'"+message+"'";
String condition="INSERT INTO member VALUES"+"("+S+")";
sql.executeUpdate(condition);
backNews="zhuce chenggong";
con.close();
}
catch(SQLException e)
{backNews="ni hai mei zhu ce ,qi huan mingzi ";
}
}
}


但是编译不行啊，说是String condition="INSERT INTO member VALUES"+"("+S+")";　　　找不到符号
这是什么原因啊，帮我看看啊

我这样改编译通过了，
是这样写的吗
String condition="INSERT INTO member VALUES('logname','password','sex','age','phone','phone','email','address','message')";