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Struts JSP/ActionForm error

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posted 20 years ago

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Hi,

I've recently started using Struts and JSP and I'm having a problem. In my JSP page I get the following error:

'Cannot compile against source model DetailForm issued from DetailForm.java'

I'm using Eclipse 3.0 and Lomboz for development. With Apache Struts 1.1.

DetailForm.java is an ActionForm class that represents a simple HTML/JSP form with employee details on it. This is included into the JSP page using the jsp:useBean tag.

I've got the gets and sets in DetailForm.java so I don't understand what is going wrong.

Any help would really be appreciated. Even if it's just a guess as to where this problem is originating from.
If you want me to post my code just let me know.

Thanks in advance

Shailesh Chandra

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posted 20 years ago

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A Mohammed ,

Your question is not clear to me!!

In struts you call actionForm by there names by mapping them to their class in struts-config.xml.

how you are introducing it using jsp:useBean tag ?? this is not clear to me.

one more thing, there is different forum for struts

[ October 27, 2004: Message edited by: Shailesh Chandra ]

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A Mohammed

Greenhorn

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posted 20 years ago

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Sorry for posting in the wrong forum. Maybe you could move the post? (please!)

Anyway, I am still struggling with this problem. Basically, I understand that the struts-config file defines the mappings, but I do not understand what the jsp:useBean tag does.

The problem is that I am modifying some existing code to fit a new application. The existing code was written a few months ago and worked on different versions of Lomboz and JBoss.

I've attached my code below, so could you please take a look and let me know what might be wrong with it.

<%@ page errorPage="errorHandler.jsp" %>
 
<jsp:useBean id="detailForm" scope="session" class="web.DetailForm" />
 
<html>
<head>
<title>Employee Detail</title>
</head>
<body bgcolor="#87CEFA">
<%
   String rowId = request.getParameter("rowId");
  if (detailForm == null) {
    throw new RuntimeException("DetailForm is null for " + rowId);
      } 
      
      //Now put a header on the page depending on the action
      String action = request.getParameter("action");
      
      if (action.equals("edit")) {
%>
 
<H2>Amend the details of Employee <%=detailForm.getName()%></H2>
 
<%
}
else if (action.equals("delete")) {
%>
 
<H2>Delete the details of Employee <%=detailForm.getName()%></H2>
 
<%
 
}
else {
throw new RuntimeException("Unexpected " + action + " Details.jsp");
}
%>

<FORM name='Details' method='POST' action='<%= response.encodeURL("detail.do?action=" + action) %>'>

<TABLE BORDER="0">
                   
            <TR>
            
                <TD>Employee ID</TD>
                <TD><%=detailForm.getEmpId()%></TD>
            </TR>
            <TR>
                <TD>Employee Name</TD>
                <TD><input type="text" name="name" value="<%=detailForm.getName()%>"></TD>
            </TR>
            <TR>
                <TD>User ID</TD>
                <TD><input type="text" name="userId" value="<%=detailForm.getUserId()%>"></TD>
            </TR>
            <TR>
                <TD>Base Office ID</TD>
                <TD><input type="text" name="baseOfficeId" value="<%=detailForm.getBaseOfficeId()%>"></TD>
            </TR>        
                        
     </TABLE>
 
    <input type="Submit" value='Save Changes'>
</FORM>

<a href="<%= response.encodeURL("search.jsp") %>">Cancel Changes</a>
  
</body>
</html>

Adeel Ansari

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posted 20 years ago

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Hi Muhammad,

Actually, <jsp:usebean> tag is a jsp tag. it is not a struts tag. you should read out some tutorials or some books to know in detail, what is the function of this tag.

I understand that you need some help. but we can not figure out what is wrong there in your code, and what should we consider as wrong.

you need to specify the following,

- what are you expecting
- what are you getting
- if exception, then which exception
- if some other thing, then what

tip: you can download a nice book on servlet & jsp from theserverside.com

thanks,

Shailesh Chandra

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posted 20 years ago

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A Mohammed

As adeel said <jsp:useBean is not struts tag....

you need to do something like this but read a struts book otherwise thing will not clear

in struts-config.xml there is a tag <form-beans> you define your formclass there as

Map your form to your action class in <action-mappings> tag. You must be doing same

and to use same in jsp you can do like

Hope This helps
[ October 27, 2004: Message edited by: Shailesh Chandra ]

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Fisher Daniel

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posted 20 years ago

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Hi A Mohammed,
May I know your struts-config.xml.
I think your action form class is not registered on struts-config.xml

Hope this helps..
thanks
daniel

A Mohammed

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posted 20 years ago

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Thanks for all your help so far. You're all very quick off the mark!

Shailesh, so the method you described would allow me to use the <bean:write tag to write any attribute of an action form class that is registered in struts-config.xml.

Would I have to have a jsp:useBean tag or anything else before I use the bean:write tag. Also what is the format/parameters of the call to bean:write?

Daniel, I've attached my struts-config.xml below, but I'm sure I have registered my action form class.

<?xml version="1.0" encoding="ISO-8859-1" ?>
 
<!DOCTYPE struts-config PUBLIC
          "-//Apache Software Foundation//DTD Struts Configuration 1.0//EN"
          "http://jakarta.apache.org/struts/dtds/struts-config_1_0.dtd">
 
<struts-config>
 
  <form-beans>
    <form-bean name="searchForm" type="web.SearchForm"/>
    <form-bean name="listForm"   type="web.ListForm"/>
    <form-bean name="detailForm" type="web.DetailForm"/>
  </form-beans>
  
  <action-mappings>
  <action    path="/search"
               type="web.SearchAction"
               name="searchForm"
               input="/search.jsp">
      <forward name="success" path="/list.jsp"/>
      <forward name="failure" path="/search.jsp"/>
   </action>
 
   <action    path="/list"
               type="web.ListAction"
               name="listForm"
               input="/list.jsp">
      <forward name="add"     path="/detail.jsp"/>
      <forward name="edit"    path="/detail.jsp"/>
      <forward name="delete"  path="/detail.jsp"/>
      <forward name="cancel"  path="/detail.jsp"/>
      <forward name="failure" path="/detail.jsp"/>
   </action>
 
    <action    path="/detail"
               type="web.DetailAction"
               name="detailForm"
               input="/detail.jsp">
      <forward name="edit"     path="/success.jsp"/>
      <forward name="delete"   path="/success.jsp"/>
      <forward name="add"      path="/success.jsp"/>
      <forward name="optimistic"  path="/optimistic_lock.jsp"/>
      <forward name="cancel"   path="/search.jsp"/>
    </action>
    
  </action-mappings>
  
</struts-config>

Shailesh Chandra

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posted 20 years ago

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A Mohammed

to use <bean:write you will have register tld like this then you can use method told by me.

<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>

you struts-config.xml seems ok,I would like to reconfirm if you are getting error while invoking url /detail

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Nathan Pruett

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posted 20 years ago

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Moving this thread to the Web Frameworks forum, since it is really about Struts.

-Nate
Write once, run anywhere, because there's nowhere to hide! - /. A.C.

With a little knowledge, a cast iron skillet is non-stick and lasts a lifetime.