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分享运行1.jsp出现下列错误：为什么？
运行1.jsp出现下列错误：为什么？
javax.servlet.ServletException: <jsp:useBean> on line '9' failed.
路径和编译后的CLASS保证正确，错误可以排除它们的原因。
1.jsp程序如下:
<html>
<head>
<title>登陆成功否？</title>
</head>
<%@ page info="[About JSP] db connection" contentType="text/html;charset=gb2312" import="bean.*" %>
<jsp:useBean id="bean3" scope="request" class="bean.SessionLib"/>
<BODY>
</BODY>
</html>
我的SessionLib程序如下：
package bean;
public class SessionLib{
public String id;
public String password;
public String sessionId;
public boolean isadmin;
public SessionLib(String id,String password,boolean admin) {
this.id=id;
this.password=password;
this.isadmin=admin;
}
}
javax.servlet.ServletException: <jsp:useBean> on line '9' failed.
路径和编译后的CLASS保证正确，错误可以排除它们的原因。
1.jsp程序如下:
<html>
<head>
<title>登陆成功否？</title>
</head>
<%@ page info="[About JSP] db connection" contentType="text/html;charset=gb2312" import="bean.*" %>
<jsp:useBean id="bean3" scope="request" class="bean.SessionLib"/>
<BODY>
</BODY>
</html>
我的SessionLib程序如下：
package bean;
public class SessionLib{
public String id;
public String password;
public String sessionId;
public boolean isadmin;
public SessionLib(String id,String password,boolean admin) {
this.id=id;
this.password=password;
this.isadmin=admin;
}
}
...全文
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可乐加水 2002-07-23
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加一个函数
public void SessionLib() {
}
public void SessionLib() {
}
binha 2002-07-23
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A bean class must have a zero-argument (empty) constructor.
You can satisfy this requirement either by explicitly
defining such a constructor or by omitting all constructors, which
results in an empty constructor being created automatically. The
empty constructor will be called when JSP elements create beans.
You can satisfy this requirement either by explicitly
defining such a constructor or by omitting all constructors, which
results in an empty constructor being created automatically. The
empty constructor will be called when JSP elements create beans.
