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Java bean problems! Argh

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Java bean problems! Argh

 
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  #1
Feb 16th, 2008
Okay, here we go. I am trying to learn how to use javabeans properly and so I've created a small bean which just writes text to the screen. I keep getting the error:

org.apache.jasper.JasperException: Unable to compile class for JSP:

An error occurred at line: 6 in the generated java file
Only a type can be imported. mybeans.processFormBean resolves to a package

and can't figure out what to do. Here is my code:

nob.jsp
java Syntax (Toggle Plain Text) 
  1.  
  2. <%@ page import="mybeans.processFormBean" %>
  3.  
  4. <jsp:useBean id="example" class="beans.example" />
  5.  
  6.  
  7.  
  8. <form name="example" action="nob.jsp" method="get">
  9. <input type="text" name="value">
  10.  
  11. <input type="submit" value="submit">
  12. </form>
  13.  
  14. <jsp:getProperty name="value" property="value" />
  15.  
  16. <%= example.getValue() %>

example.java (but I have obviously compiled it)
java Syntax (Toggle Plain Text) 
  1. package beans;
  2.  
  3. import java.sql.*;
  4.  
  5. public class example
  6. {
  7. 	private String value = "cheese";
  8.  
  9. 	public void setValue(String value) { this.value = value; }
  10.  
  11. 	public String getValue() { return value; }
  12.  
  13.  
  14. 	public void test()
  15. 	{
  16. 		System.out.println("The bean worked");
  17. 	}
  18.  
  19. }

I have checked the package names and the folders they are in etc, here is my classpath: .;C:\Program Files\Java\jre1.6.0_04\lib\ext\QTJava.zip

Thanks for your help!
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Re: Java bean problems! Argh

 
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  #2
Feb 17th, 2008
Your problem seems to be this line in your JSP file:
> <%@ page import="mybeans.processFormBean" %>
What exactly is processFormBean here? Is it a package? Are you trying to import all the classes from the processBean package? If yes, then you are doing it the wrong way. To import all the classes of a particular package, you need to do something like:

<%@page import="mybeans.processFormBean.*" %>
As a rule of thumb, *never* keep anything in your JDK/JRE installation directory. Create a separate lib folder for your application which will contain all the libraries specifically used by your applications. In case of a web application, this would be the lib directory inside WEB-INF. Also, the lib directory implicitly forms a part of your classpath so you don't have to explicitly set it anywhere.
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Re: Java bean problems! Argh

 
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  #3
Feb 17th, 2008
OKay thanks, now I'm getting the error:

org.apache.jasper.JasperException: Attempted a bean operation on a null object.
org.apache.jasper.runtime.JspRuntimeLibrary.handleGetProperty(JspRuntimeLibrary.java:603)
org.apache.jsp.nob_jsp._jspService(nob_jsp.java:73)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

Thanks for your help :-)
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Re: Java bean problems! Argh

 
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  #4
Feb 17th, 2008
> <jsp:getProperty name="value" property="value" />
This means "get the 'value' property of a bean identified by the name 'value'", but there is no such bean in your case which goes by the name of 'value'. Maybe you wanted to do something like <jsp:getProperty name="example" property="value" /> ?
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