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Struts

Cant get DispatchAction to work

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Posts: 331

posted 20 years ago

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This is my first attempt at a DispatchAction and I cant seem to get it to work
<action forward="/select.jsp" path="/select"/>
<action path="/dispatchUserSubmit" type="ch12.UserDispatchAction" parameter="method">
<forward name="insert" path="/setUpForm.do"/>
</action>
select.jsp
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
<html:html>
<body>
<html:form action="/dispatchUserSubmit">

<html:select property="method" size="4" onchange="submit()">
<html

ption value="create">Create</html

ption>
<html

ption value="delete">Delete</html

ption>
<html

ption value="insert">Insert</html

ption>
<html

ption value="update">Update</html

ption>
</html:select>

</html:form>
</body>
</html:html>
package ch12;
import org.apache.struts.actions.DispatchAction;
import javax.servlet.http.*;
import org.apache.struts.action.*;
public class UserDispatchAction extends DispatchAction {

public ActionForward insert(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
throws Exception {
return mapping.findForward("insert");
}
}
Im currently getting the following error
javax.servlet.ServletException: Cannot retrieve definition for form bean null
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:867)

Matt Raible

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Posts: 114

posted 20 years ago

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It looks like your action-mapping needs a "name" attribute - which points to a <form-bean> definition in struts-config.xml.

Matt<br /> <br />Author: <a href="http://springlive.com" target="_blank" rel="nofollow">Spring Live</a> and <a href="http://www.apress.com/book/bookDisplay.html?bID=256" target="_blank" rel="nofollow">Pro JSP</a><br />Weblogs: <a href="http://raibledesigns.com" target="_blank" rel="nofollow">Raible Designs</a> <a href="http://jroller.com/page/raible" target="_blank" rel="nofollow">Spring Live Blog</a>

john mattucci

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Posts: 331

posted 20 years ago

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but i dont need a form for what im attempting. Do i still need to define a form even though i wont be using it

and when i define a form I get the error
No getter method available for property method for bean under name org.apache.struts.taglib.html.BEAN
thats because the property named "method" is defined
<html:select property="method" size="4" onchange="submit()">
<html

ption value="create">Create</html

ption>
<html

ption value="delete">Delete</html

ption>
<html

ption value="insert">Insert</html

ption>
<html

ption value="update">Update</html

ption>
</html:select>
and I define method in the struts-config file
<action path="/dispatchUserSubmit" type="ch12.UserDispatchAction" parameter="method">
what am i doing wrong or forgetting to do to get this to work

poornima balagopal

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Posts: 83

posted 20 years ago

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Hi,
When you use DispatchAction class we can have more than one method in our action class(I think you know this right )Now I will show a small example how to use DispatchAction class
I have a action class for my registration of a form. In that i have methods for inserting the registered data to the table, deleting some record and for modifying the record
the class will be like this
public RegAction extends DispatchAction
{
public ActionForward insertDetails(ActionMapping mapping,
ActionForm form, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
{
*** your code**
return mapping.findForward("inserted");
}
public ActionForward deleteDetails(ActionMapping mapping,
ActionForm form, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
{
*** code ***
return mapping.findForward("deleted");
}
}
This class i am mappiing as
<action mapping="/register" name="regForm" type="mypackage1.RegAction" parameter="option" input="/register.jsp">
<forward name="inserted" path="/menu.jsp"/>
<forward name="deleted" path="/login.jsp"/>
</action>
You can give the forward as you want. Now in the jsp you have to give the form action as
<html:form action="/register?option=insertDetails">
</html:form> . This is for insertion part for delete part give option=deleteDetails.
Here insead of option you can use what name you want . Only thing is that it should match with what we are specifying as parameter in the action mapping.
there option= whatever we are giving is the method name which we want to use for that particular action
hope this will help you
Try like this

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