RE: java.lang.ClassCastException trying to populate html:select
FYI Each web application has its own struts.jar so different web apps could be running different struts versions. If you need to use LabelValueBean in an earlier version, you can always copy the source. Don't ya just love open source? Steve -Original Message- From: Alex Cantatore [mailto:[EMAIL PROTECTED] Sent: July 3, 2003 2:21 PM To: Struts Users Mailing List Subject: Re: java.lang.ClassCastException trying to populate html:select I forgot to mention it, but I can't use org.apache.struts.util.LabelValueBean, unfortunately, as I am using an older version of Struts. Though it would be nice to upgrade, my supervisor has told me that I have to use the older version as the server is set up to run it and there are other apps on the server that require it. ... - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: java.lang.ClassCastException trying to populate html:select
Please? Can anyone help me? I'm really lost here.
-Alex
--- Alex Cantatore [EMAIL PROTECTED] wrote:
Hi all, I have been working on this for two days and
it's gotten to the point where I cannot see what I
did
wrong in the least. I'm just trying to figure out
how
to make it work; the actual program is a bare shell
with the sole purpose of populating a html:select.
There is a RegisterAction,success.jsp, ArrayForm,
and
ValueInfoBean.
You start by calling register.do, which creates an
ArrayList and puts three ValueInfoBeans in it. It
then sets ArrayForm to carry the ArrayList, wherein
it
is converted to a Collection. Control is then
passed
to success.jsp which tries to read in the Collection
to populate the html:select, but instead gives me
a
ClassCastException. Any help would be greatly
appreciated. Code follows.
public class ValueInfoBean extends ActionForm {
private String value = null;
private String info = null;
public String getValue() {
return value;
}
public void setValue(String v) {
value = v;
}
public String getInfo() {
return info;
}
public void setInfo(String i) {
info = i;
}
public ValueInfoBean() {
super();
}
public void reset(ActionMapping mapping,
HttpServletRequest request) {
value = null;
info = null;
}
}
public class ArrayForm extends ActionForm {
private Collection theArray = null;
public Collection getTheArray() {
return theArray;
}
public void setTheArray(ArrayList t) {
theArray = t;
}
public ArrayForm() {
super();
}
public void reset(ActionMapping mapping,
HttpServletRequest request) {
theArray = null;
}
}
public class RegisterAction extends Action {
/**
* Constructor
*/
public RegisterAction() {
super();
}
public ActionForward perform(
ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException {
ActionErrors errors = new ActionErrors();
ArrayList myList = new ArrayList();
ValueInfoBean myBean = new ValueInfoBean();
for(int i = 0; i 3; i++)
{
myBean.setValue(String.valueOf(i));
myBean.setInfo(i + Please work + i);
myList.add(myBean);
}
ArrayForm thisArray = new ArrayForm();
thisArray.setTheArray(myList);
request.setAttribute(beanArray, thisArray);
return mapping.findForward(success);
}
}
and success.jsp:
html:form action=register.do
bean:define id=theArray scope=request
name=beanArray type=java.util.Collection/
html:select property=username multiple=true
html:options collection=theArray
property=value
labelProperty=info/
/html:select
/html:form
/BODY
/html:html
Once again, major thanks to anyone who can help in
the
least.
-Alex
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Re: java.lang.ClassCastException trying to populate html:select
I think the reason why no one has tackled this is
because there is a lot of things this could be.
The exact error isn't mentioned either. Maybe show a
bit of the stack trace?
Let me take a crack at it by giving you the basics of
what struts does and then maybe this will help?
I wouldn't use a ValueInfoBean that extends ActionForm
- there is no need. There is an
org.apache.struts.util.LabelValueBean that does
exactly this and is used by some of the tags:
optionsCollection for example.
Your struts-config should have a
/register in the path and should declare what your
form is and what scope it is in.
The line where you create the arrayForm is unnecessary
since it will be created for you by the time the
execute is called.
I would use optionsCollection with LabelValue Beans
instead of using collection attribute with options
tag. Read the user docs carefully since the select
and multiple select is the hardest one.
sandeep
--- Alex Cantatore [EMAIL PROTECTED] wrote:
Please? Can anyone help me? I'm really lost here.
-Alex
--- Alex Cantatore [EMAIL PROTECTED] wrote:
Hi all, I have been working on this for two days
and
it's gotten to the point where I cannot see what I
did
wrong in the least. I'm just trying to figure out
how
to make it work; the actual program is a bare
shell
with the sole purpose of populating a
html:select.
There is a RegisterAction,success.jsp, ArrayForm,
and
ValueInfoBean.
You start by calling register.do, which creates an
ArrayList and puts three ValueInfoBeans in it. It
then sets ArrayForm to carry the ArrayList,
wherein
it
is converted to a Collection. Control is then
passed
to success.jsp which tries to read in the
Collection
to populate the html:select, but instead gives
me
a
ClassCastException. Any help would be greatly
appreciated. Code follows.
public class ValueInfoBean extends ActionForm {
private String value = null;
private String info = null;
public String getValue() {
return value;
}
public void setValue(String v) {
value = v;
}
public String getInfo() {
return info;
}
public void setInfo(String i) {
info = i;
}
public ValueInfoBean() {
super();
}
public void reset(ActionMapping mapping,
HttpServletRequest request) {
value = null;
info = null;
}
}
public class ArrayForm extends ActionForm {
private Collection theArray = null;
public Collection getTheArray() {
return theArray;
}
public void setTheArray(ArrayList t) {
theArray = t;
}
public ArrayForm() {
super();
}
public void reset(ActionMapping mapping,
HttpServletRequest request) {
theArray = null;
}
}
public class RegisterAction extends Action {
/**
* Constructor
*/
public RegisterAction() {
super();
}
public ActionForward perform(
ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException {
ActionErrors errors = new ActionErrors();
ArrayList myList = new ArrayList();
ValueInfoBean myBean = new ValueInfoBean();
for(int i = 0; i 3; i++)
{
myBean.setValue(String.valueOf(i));
myBean.setInfo(i + Please work + i);
myList.add(myBean);
}
ArrayForm thisArray = new ArrayForm();
thisArray.setTheArray(myList);
request.setAttribute(beanArray, thisArray);
return mapping.findForward(success);
}
}
and success.jsp:
html:form action=register.do
bean:define id=theArray scope=request
name=beanArray type=java.util.Collection/
html:select property=username multiple=true
html:options collection=theArray
property=value
labelProperty=info/
/html:select
/html:form
/BODY
/html:html
Once again, major thanks to anyone who can help in
the
least.
-Alex
__
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Re: java.lang.ClassCastException trying to populate html:select
I forgot to mention it, but I can't use org.apache.struts.util.LabelValueBean, unfortunately, as I am using an older version of Struts. Though it would be nice to upgrade, my supervisor has told me that I have to use the older version as the server is set up to run it and there are other apps on the server that require it. Or something. It was one of those, Because I said so, situations, so there's really nothing I can do with respect to that. I'm fooling around with some of the other things you mentioned, but I've never heard of optionsCollection before now. I think it is 1.1 as well though, yes? I'm stuck with 1.0.2 solutions. The complete error message follows, my apologies for not including it originally. -Alex [Servlet Error]-[JSP 1.2 Processor]: java.lang.ClassCastException: com.ejgallo.chapteroneweb.app.ArrayForm at org.apache.jsp._success._jspService(_success.java:132) at com.ibm.ws.webcontainer.jsp.runtime.HttpJspBase.service(HttpJspBase.java:89) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at com.ibm.ws.webcontainer.jsp.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:344) at com.ibm.ws.webcontainer.jsp.servlet.JspServlet.serviceJspFile(JspServlet.java:598) at com.ibm.ws.webcontainer.jsp.servlet.JspServlet.service(JspServlet.java:696) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at com.ibm.ws.webcontainer.servlet.StrictServletInstance.doService(StrictServletInstance.java:110) at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet._service(StrictLifecycleServlet.java:174) at com.ibm.ws.webcontainer.servlet.IdleServletState.service(StrictLifecycleServlet.java:313) at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet.service(StrictLifecycleServlet.java:116) at com.ibm.ws.webcontainer.servlet.ServletInstance.service(ServletInstance.java:258) at com.ibm.ws.webcontainer.servlet.ValidServletReferenceState.dispatch(ValidServletReferenceState.java:42) at com.ibm.ws.webcontainer.servlet.ServletInstanceReference.dispatch(ServletInstanceReference.java:40) at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.handleWebAppDispatch(WebAppRequestDispatcher.java:872) at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.dispatch(WebAppRequestDispatcher.java:491) at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:173) at org.apache.struts.action.ActionServlet.processActionForward(ActionServlet.java:1759) at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1596) at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:492) at javax.servlet.http.HttpServlet.service(HttpServlet.java:740) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at com.ibm.ws.webcontainer.servlet.StrictServletInstance.doService(StrictServletInstance.java:110) at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet._service(StrictLifecycleServlet.java:174) at com.ibm.ws.webcontainer.servlet.IdleServletState.service(StrictLifecycleServlet.java:313) at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet.service(StrictLifecycleServlet.java:116) at com.ibm.ws.webcontainer.servlet.ServletInstance.service(ServletInstance.java:258) at com.ibm.ws.webcontainer.servlet.ValidServletReferenceState.dispatch(ValidServletReferenceState.java:42) at com.ibm.ws.webcontainer.servlet.ServletInstanceReference.dispatch(ServletInstanceReference.java:40) at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.handleWebAppDispatch(WebAppRequestDispatcher.java:872) at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.dispatch(WebAppRequestDispatcher.java:491) at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:173) at com.ibm.ws.webcontainer.srt.WebAppInvoker.doForward(WebAppInvoker.java:79) at com.ibm.ws.webcontainer.srt.WebAppInvoker.handleInvocationHook(WebAppInvoker.java:199) at com.ibm.ws.webcontainer.cache.invocation.CachedInvocation.handleInvocation(CachedInvocation.java:71) at com.ibm.ws.webcontainer.srp.ServletRequestProcessor.dispatchByURI(ServletRequestProcessor.java:182) at com.ibm.ws.webcontainer.oselistener.OSEListenerDispatcher.service(OSEListener.java:331) at com.ibm.ws.webcontainer.http.HttpConnection.handleRequest(HttpConnection.java:56) at com.ibm.ws.http.HttpConnection.readAndHandleRequest(HttpConnection.java:432) at com.ibm.ws.http.HttpConnection.run(HttpConnection.java:343) at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:592) --- Sandeep Takhar [EMAIL PROTECTED] wrote: I think the reason why no one has tackled this is because there is a lot of things this could be. The exact error isn't mentioned
