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Help in using bean inside JSP

Agnit Chatterjee
Greenhorn

Joined: Mar 04, 2011
Posts: 24
java file: try1.java





1st JSP file

2nd JSP file




I keep on getting some error or the other..........could you please help me.......where am I mistaking! Please help
Bear Bibeault
Author and ninkuma
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Joined: Jan 10, 2002
Posts: 61773
    
  67

Step 1: Move the Java code out of the JSP and into a Java class. Do it now. Java code in a JSP has been discredited for almost 10 years now and its use is irresponsible.

Step 2: Once you've done that, if you still get errors, please be sure to post the nature of the errors.


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Agnit Chatterjee
Greenhorn

Joined: Mar 04, 2011
Posts: 24
But I have kept here 2 JSP files and a Java file separately
Bear Bibeault
Author and ninkuma
Marshal

Joined: Jan 10, 2002
Posts: 61773
    
  67

Please read this article for information on properly structuring web applications.

Java has no place inside a JSP. That is an extremely poor practice that went out of favor in 2002.
Agnit Chatterjee
Greenhorn

Joined: Mar 04, 2011
Posts: 24
Please help me out.......I can't figure out where the problem is............please help
Jeanne Boyarsky
author & internet detective
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Joined: May 26, 2003
Posts: 31079
    
163

I've added code tags to make your post readable. I can't find where you say what the error is. Can you call attention to that so people can help you?


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Agnit Chatterjee
Greenhorn

Joined: Mar 04, 2011
Posts: 24
Here is the details of the error I am getting:

type Exception report

message

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

exception

org.apache.jasper.JasperException: /myfirst.jsp(4,0) The value for the useBean class attribute jdbc.try1 is invalid.
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:41)
org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:407)
org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:148)
org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1221)
org.apache.jasper.compiler.Node$UseBean.accept(Node.java:1182)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2376)
org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2428)
org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2434)
org.apache.jasper.compiler.Node$Root.accept(Node.java:475)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2376)
org.apache.jasper.compiler.Generator.generate(Generator.java:3458)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:249)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:365)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:345)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:332)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:594)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:342)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:391)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.8 logs.
Agnit Chatterjee
Greenhorn

Joined: Mar 04, 2011
Posts: 24
They are giving the error:

Name was not previously introduced as per JSP.5.3

Where is the problem???
Jeanne Boyarsky
author & internet detective
Marshal

Joined: May 26, 2003
Posts: 31079
    
163

Moving back to the JSP forum as this is a JDBC question.

Reposting the relevant lines to make it easier to read.
<%@ page import="jdbc.try1" %>
<jsp:useBean id="try1" scope="application" class="jdbc.try1" />

Where is the class file for try1 located? Is it already defined in the application scope?

Note that it is common convention for classnames to begin with an uppercase letter.
Agnit Chatterjee
Greenhorn

Joined: Mar 04, 2011
Posts: 24
class file for try1 is located inside WEB-INF\classes\jdbc

I had made some modifications........like some silly programming errors in the jdbc portion which I did eradicate........still get the error:

The value for the useBean class attribute jdbc.try1 is invalid.

The new files are as follows:

myfirst.jsp





try1.java


properties.jsp




I had intentionally put the try1.java file in a new package called testing. The other two files are jsp files

Vijitha Kumara
Bartender

Joined: Mar 24, 2008
Posts: 3860

Make your class's constructor public, otherwise the container is not be able to instantiate it....


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Agnit Chatterjee
Greenhorn

Joined: Mar 04, 2011
Posts: 24
Thanks to everybody out there who helped me out.............It's finally done!!! My first JSP program using JDBC.feels great.
 
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