Calling bean from jsp page

madhavaram123 · January 30th, 2006, 08:55 AM

Hi,

I have my java bean code as:

public class SimpleBean {

  private String message = "No message specified";

  public String getMessage() {
    return message;
  }

  public void setMessage(String message) {
    this.message = message;
  }

}

and I have my jsp code as:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE>Reusing JavaBeans in JSP</TITLE>
</HEAD>
<BODY>
<jsp:useBean id="test" class="SimpleBean" />
<jsp:setProperty name="test" property="message" value="Hello WWW" />
<H1>Message: <I>
<jsp:getProperty name="test" property="message" />
</BODY>
</HTML>

I am getting the error as:
org.apache.jasper.JasperException: Unable to compile class for JSP

An error occurred at line: 17 in the jsp file: /beanTest.jsp
Generated servlet error:
D:\jboss-3.2.7\server\im\work\jboss.web\localhost\my\org\ap ache\jsp\beanTest_jsp.java:58: cannot find symbol
symbol : class SimpleBean
location: class org.apache.jsp.beanTest_jsp
      SimpleBean test = null;
      ^

An error occurred at line: 17 in the jsp file: /beanTest.jsp
Generated servlet error:
D:\jboss-3.2.7\server\im\work\jboss.web\localhost\my\org\ap ache\jsp\beanTest_jsp.java:60: cannot find symbol
symbol : class SimpleBean
location: class org.apache.jsp.beanTest_jsp
        test = (SimpleBean) _jspx_page_context.getAttribute("test", PageContext.PAGE_SCOPE);
                ^

An error occurred at line: 17 in the jsp file: /beanTest.jsp
Generated servlet error:
D:\jboss-3.2.7\server\im\work\jboss.web\localhost\my\org\ap ache\jsp\beanTest_jsp.java:62: cannot find symbol
symbol : class SimpleBean
location: class org.apache.jsp.beanTest_jsp
          test = new SimpleBean();
                     ^

An error occurred at line: 21 in the jsp file: /beanTest.jsp
Generated servlet error:
D:\jboss-3.2.7\server\im\work\jboss.web\localhost\my\org\ap ache\jsp\beanTest_jsp.java:72: cannot find symbol
symbol : class SimpleBean
location: class org.apache.jsp.beanTest_jsp
      out.write(org.apache.jasper.runtime.JspRuntimeLibr ary.toString((((SimpleBean)_jspx_page_context.find Attribute("test")).getMessage())));
                                                                        ^
4 errors

    org.apache.jasper.compiler.DefaultErrorHandler.jav acError(DefaultErrorHandler.java:84)
    org.apache.jasper.compiler.ErrorDispatcher.javacEr ror(ErrorDispatcher.java:332)
    org.apache.jasper.compiler.Compiler.generateClass( Compiler.java:437)
    org.apache.jasper.compiler.Compiler.compile(Compil er.java:497)
    org.apache.jasper.compiler.Compiler.compile(Compil er.java:476)
    org.apache.jasper.compiler.Compiler.compile(Compil er.java:464)
    org.apache.jasper.JspCompilationContext.compile(Js pCompilationContext.java:511)
    org.apache.jasper.servlet.JspServletWrapper.servic e(JspServletWrapper.java:295)
    org.apache.jasper.servlet.JspServlet.serviceJspFil e(JspServlet.java:292)
    org.apache.jasper.servlet.JspServlet.service(JspSe rvlet.java:236)
    javax.servlet.http.HttpServlet.service(HttpServlet .java:810)
    org.jboss.web.tomcat.filters.ReplyHeaderFilter.doF ilter(ReplyHeaderFilter.java:75)

note The full stack trace of the root cause is available in the Apache Tomcat/5.0.30 logs.

Can anyone help me out why mistake I have doen in above program

longjava · January 30th, 2006, 06:42 PM

The errors seem to me that your result complied byte-code (SimpleBean.class) did not get copied in to the right place. Since your bean class SimpleBean did not have a package name, therefore it is located in the default package. Make sure your result compile byte-code of your beans get copied to WEB-INF/classes directory if your bean classes do not have package name defined. If your beans have a package name defined then copy the result compile byte-code to the package name accordingly.

For example:

// without a package name defined
class A
{
}
// copy the A.class to WEB-INF/classes directory

// with a package name is defined
package mycompany.myapp.mymodule;
class B
{
}
// copy the B.class to the WEB-INF/classes/mycompany/myapp/mymodule directory

madhavaram123 · January 31st, 2006, 01:27 AM

Hi,

Thanks for the reply. I tried the same but ended with the same error. This is making me mad..............

longjava · January 31st, 2006, 05:18 AM

How do you jar you war file? Can I see the content of it? Since you are using JBoss Application server I wonder what type of deployment archive file you deploy with your app? war file or ear file??

panacea · February 13th, 2006, 05:12 AM

What files are in your WEB-INF/classes directory? SimpleBean.class needs to be in there -- is it?

Jon Emerson
http://www.jonemerson.net/

jetbrains · February 17th, 2006, 04:07 AM

What files are in your WEB-INF/classes directory? SimpleBean.class needs to be in there -- is it?
You also can make the class to jar,and copy it into WEB_INF/classes directory

JAVA Email
http://www.wisesoft.biz/

antonrojo · May 10th, 2006, 09:15 PM

Despite the time lag, I thought I'd post a response. I'm having the exact same problem running through a JSP tutorial.

The section that calls the bean:
<jsp:useBean id="myHobby" scope="session" class="Hobby"/>
<c:when test="${true}" >
  <h2>Your favorite hobby is ${myHobby["myHobby"]}!</h2>
</c:when>
</c:choose>

Classes in WEB-INF/Classes: Hobby.class

Translated jsp that applies:
      Hobby myHobby = null;
      synchronized (session) {
        myHobby = (Hobby) _jspx_page_context.getAttribute("myHobby", PageContext.SESSION_SCOPE);
        if (myHobby == null){
          myHobby = new Hobby();
          _jspx_page_context.setAttribute("myHobby", myHobby, PageContext.SESSION_SCOPE);

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

Generated servlet error:
    [javac] C:\Sun\AppServer\domains\domain1\generated\jsp\j2e e-modules\hello1\org\apache\jsp\luckyNumber_jsp.java :69: cannot find symbol
    [javac] symbol : class Hobby
    [javac] location: class org.apache.jsp.luckyNumber_jsp
    [javac] Hobby aHobby = null;
    [javac] ^

Generated servlet error:
    [javac] C:\Sun\AppServer\domains\domain1\generated\jsp\j2e e-modules\hello1\org\apache\jsp\luckyNumber_jsp.java :71: cannot find symbol
    [javac] symbol : class Hobby
    [javac] location: class org.apache.jsp.luckyNumber_jsp
    [javac] aHobby = (Hobby) _jspx_page_context.getAttribute("aHobby", PageContext.SESSION_SCOPE);
    [javac] ^

Generated servlet error:
    [javac] C:\Sun\AppServer\domains\domain1\generated\jsp\j2e e-modules\hello1\org\apache\jsp\luckyNumber_jsp.java :73: cannot find symbol
    [javac] symbol : class Hobby
    [javac] location: class org.apache.jsp.luckyNumber_jsp
    [javac] aHobby = new Hobby();
    [javac] ^

Generated servlet error:
    [javac] Note: C:\Sun\AppServer\domains\domain1\generated\jsp\j2e e-modules\hello1\org\apache\jsp\luckyNumber_jsp.java uses unchecked or unsafe operations.

Generated servlet error:
    [javac] Note: Recompile with -Xlint:unchecked for details.
    [javac] 3 errors

My attempts to import the folder (which I know should be unnecessary):
<@page import="classes.*">
<@page import="classes.Hobby">
<@page import="WEB-INF.classes.*">