RE: Please Help - ClassCastException
I've been responding to your questions here and at JavaRanch on this
subject.
It seems like you are missing the point of DynaActionForms.
Please read 4.3 and 4.4 of the user guide.
http://jakarta.apache.org/struts/userGuide/building_controller.html
Lots of additional comments below.
Comments below look for *
-Original Message-
From: Caroline Jen [mailto:[EMAIL PROTECTED]
Sent: Sunday, January 04, 2004 10:18 PM
To: Struts Users Mailing List
Subject: RE: Please Help - ClassCastException
Allow me to ask three more questions:
1. If I want to reset some specific text fields when
the JSP is re-displayed, do I code the PostForm.java
like this (please confirm):
code:
-
import org.apache.struts.validator.DynaValidatorForm;
import org.apache.struts.action.ActionMapping;
import javax.servlet.http.HttpServletRequest;
public class PostForm extends DynaValidatorForm
{
public void reset(ActionMapping mapping,
HttpServletRequest request)
{
super.reset( mapping, request );
set( receiver, new String() );
set( sender, new String() );
}
public PostForm () {}
}
*** Why not just use the intial attribute of the form-property
element?
---
2. if I want to reset all the text fields when the JSP
is re-displayed, do I code like this (please confirm):
code:
---
import org.apache.struts.validator.DynaValidatorForm;
import org.apache.struts.action.ActionMapping;
import javax.servlet.http.HttpServletRequest;
public class PostForm extends DynaValidatorForm
{
public void reset(ActionMapping mapping,
HttpServletRequest request)
{
initialize( mapping );
}
public PostForm () {}
}
--
*** Why not just use the intial attribute of the form-property
element?
3. What is the difference between
code:
---
form-bean
name=postForm
type=package.package.package.PostForm
form-property
name=receiver
type=java.lang.String/
form-property
name=sender
type=java.lang.String/
/form-bean
---
AND
code:
--
form-bean
name=postForm
type=org.apache.struts.validator.DynaValidatorForm
form-property
name=receiver
type=java.lang.String/
form-property
name=sender
type=java.lang.String/
/form-bean
---
Thank you very much.
*** The second one makes sense. Why do you need the PostForm
class?
see my answer to a similar question of yours at JavaRanch
http://saloon.javaranch.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topicf=58t=
001820
Here is a snippet of some tutorial I am working on that might help.
DynaActionForms are universally loved and hated. In teaching, consulting
Struts and developing with Struts, I have found that DynaActionForms are
either embraced or rejected. The idea behind DynaActionForms is that instead
of creating an ActionForm per form, you instead configure an ActionForm per
form.
Advantages of DynaActionForms:
Some folks feel creating an ActionForm class for each HTML form in your
Struts application is time-consuming, causes maintenance problems, and is
frustrating. With DynaActionForm classes you don't have to create an
ActionForm subclass for each form and a bean property for each field.
Instead you configure an DynaActionForm its properties, type, and defaults
in the Struts configuration file.
snip
To configure a DynaActionForm in struts-config.xml, you use a form-bean
element as with normal ActionForm. The type of the form bean must be
org.apache.struts.action.DynaActionForm or a derived class. You then add
form-property elements to declare the properties of the form.
To use a DynaActionForm add the following to form-beans element (example):
form-bean name=userRegistrationDynaForm
type=org.apache.struts.action.DynaActionForm
form-property name=userName
type=java.lang.String /
form-property name=email
type=java.lang.String /
form-property name=password
type=java.lang.String /
form-property name=passwordCheck
type=java.lang.String /
form-property name=firstName
type=java.lang.String /
form-property name=lastName
type=java.lang.String /
form-property name=phone
type=java.lang.String
initial=(520) /
form-property name=fax type=java.lang.String /
form-property name=page
type
RE: Please Help - ClassCastException
I am still confused...
I have a jsp that provides text fields for user to
fill out information. All the information is passed
via HttpRequest and to be validated. And all the
properties in my PostForm are populated by the
information retrieved from those text fields.
And my PostForm is of
type=org.apache.struts.validator.DynaValidatorForm
Therefore, in my PostForm.java, I should do something
like this? I just do not think the following code is
correct.
==
import org.apache.struts.validator.DynaValidatorForm;
public class PostForm extends DynaValidatorForm {
private String receiver;
private String sender;
public void set(String receiver, String receiver);
public void set(String sender, String sender);
public String get(String receiver, String
receiver);
public String get(String sender, String sender);
}
==
And you are saying that in my action class, I should
...
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForm;
import org.apache.commons.beanutils.BeanUtils;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.artimus.message.PostForm;
import org.apache.artimus.message.PostBean;
import org.apache.artimus.message.ThreadBean;
import org.apache.artimus.message.utility.DateUtil;
public final class StoreMessage extends Action
{
public ActionForward execute(ActionMapping mapping,
ActionForm form,
HttpServletRequest
request,
HttpServletResponse
response)
throws Exception
{
int parentPostID;
int threadID;
String memberName = request.getRemoteUser();
Timestamp now =
DateUtil.getCurrentGMTTimestamp();
parentPostID = Integer.parseInt(
request.getParameter( parent ) );
ActionForm postForm = ( ActionForm )form;
ThreadHandler thandler = new ThreadHandler();
ThreadBean threadBean = new ThreadBean();
BeanUtils.copyProperties( threadBean, postForm
);
if (parentPostID == 0 ) // new topic
{
threadBean.setLastPostMemberName( memberName
);
threadBean.setThreadCreationDate( now );
.
.
threadID = thandler.insertThread( threadBean
);
}
...
...
}
}
--- Joe Hertz [EMAIL PROTECTED] wrote:
Well, first off:
In your (dyna) form, you don't create setters and
getters for the properties
though. With DynaForms you would say
set(myPropertyName, myString)
instead of calling setMyPropertyName(myString).
This is the Dyna part of
DynaForms. It's much less tedious IMHO.
In your action, you absolutely want to cast the form
to PostForm. Otherwise
the form variable has no way to know properties are
associated with it. So
yes, once you cast it to PostForm calls to
BeanUtils.copyProperties() can and
will work properly.
Hope this helps,
-Joe
-Original Message-
From: Caroline Jen [mailto:[EMAIL PROTECTED]
Sent: Sunday, January 04, 2004 1:42 AM
To: Struts Users Mailing List
Subject: RE: Please Help - ClassCastException
I think that there are a lot more mistakes in my
code
than I originally thought. The root of the
problem is
that I do not know how to use DynaValidatorForm.
If
you could help me in learning how to code when I
am
working with DynaValidatorForm.
1. in my struts-config.xml, I have:
form-bean
name=postForm
type=org.apache.struts.validator.DynaValidatorForm
form-property
name=receiver
type=java.lang.String/
form-property
name=sender
type=java.lang.String/
.
.
/form-bean
2. My PostForm.java is like:
import
org.apache.struts.validator.DynaValidatorForm;
import org.apache.struts.action.ActionMapping;
public class PostForm extends DynaValidatorForm {
private String receiver;
private String sender;
..
public void setReceiver( String receiver )
{
this.receiver = receiver;
}
public void setSender( String sender )
{
this.sender = sender;
}
public String getReceiver()
{
return receiver;
}
public String getSender()
{
return sender;
}
.
.
}
3. in my action class (see the code below)
3.1. do I cast the form to DynaActionForm? or I
should
cast the form to DynaValidatorForm?
3.2. Can I use the copyProperties() method of the
BeanUtils to convert the form to a bean?
BeanUtils.copyProperties
RE: Please Help - ClassCastException
Not at all.
First off, set(String, String) is predefined for you. You don't need to
create any of that. In fact, what you will find in a DynaValidatorForm is
that your form classes start to get very sparse. Here's really what it could
look like.
public class PostForm extends BaseDynaForm {
public void reset(ActionMapping actionMapping, HttpServletRequest
httpServletRequest) {
// throw new UnsupportedOperationException(Method is not
implemented);
}
public PostForm () {
}
}
In your ActionForm itself, beanUtils would work something like this. All you
need is to get the right formBean object.
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) throws Exception {
PostForm pForm = (PostForm) form;
// other code you write here
BeanUtils.copyProperties(yourBean, pForm);
// etc
Doing it yourself without beanUtils?
Instead of calling getSender() and having a String returned, you call get
(sender) and it will return an Object (cast it yourself to whatever type
the sender form property really is). I made a base form class with a
getString method that calls get() and does the String cast for me to save the
tediom.
Making sense now?
-Original Message-
From: Caroline Jen [mailto:[EMAIL PROTECTED]
Sent: Sunday, January 04, 2004 2:46 AM
To: Struts Users Mailing List
Subject: RE: Please Help - ClassCastException
I am still confused...
I have a jsp that provides text fields for user to
fill out information. All the information is passed
via HttpRequest and to be validated. And all the
properties in my PostForm are populated by the
information retrieved from those text fields.
And my PostForm is of
type=org.apache.struts.validator.DynaValidatorForm
Therefore, in my PostForm.java, I should do something
like this? I just do not think the following code is
correct.
==
import org.apache.struts.validator.DynaValidatorForm;
public class PostForm extends DynaValidatorForm {
private String receiver;
private String sender;
public void set(String receiver, String receiver);
public void set(String sender, String sender);
public String get(String receiver, String
receiver);
public String get(String sender, String sender);
}
==
And you are saying that in my action class, I should
...
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForm;
import org.apache.commons.beanutils.BeanUtils;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.artimus.message.PostForm;
import org.apache.artimus.message.PostBean;
import org.apache.artimus.message.ThreadBean;
import org.apache.artimus.message.utility.DateUtil;
public final class StoreMessage extends Action
{
public ActionForward execute(ActionMapping mapping,
ActionForm form,
HttpServletRequest
request,
HttpServletResponse
response)
throws Exception
{
int parentPostID;
int threadID;
String memberName = request.getRemoteUser();
Timestamp now =
DateUtil.getCurrentGMTTimestamp();
parentPostID = Integer.parseInt(
request.getParameter( parent ) );
ActionForm postForm = ( ActionForm )form;
ThreadHandler thandler = new ThreadHandler();
ThreadBean threadBean = new ThreadBean();
BeanUtils.copyProperties( threadBean, postForm
);
if (parentPostID == 0 ) // new topic
{
threadBean.setLastPostMemberName( memberName
);
threadBean.setThreadCreationDate( now );
.
.
threadID = thandler.insertThread( threadBean
);
}
...
...
}
}
--- Joe Hertz [EMAIL PROTECTED] wrote:
Well, first off:
In your (dyna) form, you don't create setters and
getters for the properties
though. With DynaForms you would say
set(myPropertyName, myString)
instead of calling setMyPropertyName(myString).
This is the Dyna part of
DynaForms. It's much less tedious IMHO.
In your action, you absolutely want to cast the form
to PostForm. Otherwise
the form variable has no way to know properties are
associated with it. So
yes, once you cast it to PostForm calls to
BeanUtils.copyProperties() can and
will work properly.
Hope this helps,
-Joe
-Original Message-
From: Caroline Jen [mailto:[EMAIL PROTECTED]
Sent: Sunday, January 04, 2004 1:42 AM
To: Struts Users Mailing List
Subject: RE
Re: Please Help - ClassCastException
On 04/01/2004 05:04, Caroline Jen [EMAIL PROTECTED] wrote:
Thank you for trying to help. I have added
import org.apache.artimus.message.PostForm;
to my action class. I do not fully follow what I
should check in the struts-config.xml file. And
should I use name=postForm with lowercase 'p' or
uppercase 'P'?
In my struts-config.xml file, I have:
form-bean
name=postForm
type=org.apache.struts.validator.DynaValidatorForm
Here is the problem. Replace
org.apache.struts.validator.DynaValidatorForm
for
org.apache.artimus.message.PostForm
That should work
Pedro Salgado
form-property
name=receiver
type=java.lang.String/
form-property
name=sender
type=java.lang.String/
form-property
name=title
type=java.lang.String/
form-property
name=postTopic
type=java.lang.String/
form-property
name=postBody
type=java.lang.String/
/form-bean
and
action
roles=administrator,editor,contributor
path=/message/NewTopic
type=org.apache.artimus.message.StoreMessage
name=postForm
scope=request
validate=true
input=.message.Form
forward
name=success
path=.article.View/
/action
Do you see any problems?
--- Pedro Salgado [EMAIL PROTECTED] wrote:
On your struts config file check if the form bean
for StoreMessage action
is of type pkg.pkg.PostForm and if the action name
is pointing to the
correct form bean... It also seems to be missing the
import of the PostForm
on your action class.
Pedro Salgado
On 04/01/2004 03:22, Caroline Jen
[EMAIL PROTECTED] wrote:
The statement shown below encountered a
ClassCastException:
PostForm postForm = ( PostForm )form;
I cannot figure out the reason. Please help.
Allow me to show more code of the class where the
exception occurred:
...
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForm;
import org.apache.commons.beanutils.BeanUtils;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.artimus.message.PostBean;
import org.apache.artimus.message.ThreadBean;
import
org.apache.artimus.message.utility.DateUtil;
public final class StoreMessage extends Action
{
public ActionForward execute(ActionMapping
mapping,
ActionForm form,
HttpServletRequest
request,
HttpServletResponse
response)
throws Exception
{
int parentPostID;
int threadID;
int postID;
String postCreationIP;
String memberName = request.getRemoteUser();
Timestamp now =
DateUtil.getCurrentGMTTimestamp();
parentPostID = Integer.parseInt(
request.getParameter( parent ) );
PostForm postForm = ( PostForm )form;
}
}
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Re: Please Help - ClassCastException
This passage is straight from the struts javadoc
The key passed into the validator is the action element's 'name' attribute
from the struts-config.xml which should match the form element's name
attribute in the validation.xml
Take a peek at how to configure struts-config.xml at
http://www.reumann.net/do/struts/lesson3/step4
which details the form bean name
type (with the fully qualified package name)
and the column form-property
Keep me apprised,
Martin
- Original Message -
From: Pedro Salgado [EMAIL PROTECTED]
To: Struts Users Mailing List [EMAIL PROTECTED]
Sent: Wednesday, December 31, 1969 7:05 PM
Subject: Re: Please Help - ClassCastException
On 04/01/2004 05:04, Caroline Jen [EMAIL PROTECTED] wrote:
Thank you for trying to help. I have added
import org.apache.artimus.message.PostForm;
to my action class. I do not fully follow what I
should check in the struts-config.xml file. And
should I use name=postForm with lowercase 'p' or
uppercase 'P'?
In my struts-config.xml file, I have:
form-bean
name=postForm
type=org.apache.struts.validator.DynaValidatorForm
Here is the problem. Replace
org.apache.struts.validator.DynaValidatorForm
for
org.apache.artimus.message.PostForm
That should work
Pedro Salgado
form-property
name=receiver
type=java.lang.String/
form-property
name=sender
type=java.lang.String/
form-property
name=title
type=java.lang.String/
form-property
name=postTopic
type=java.lang.String/
form-property
name=postBody
type=java.lang.String/
/form-bean
and
action
roles=administrator,editor,contributor
path=/message/NewTopic
type=org.apache.artimus.message.StoreMessage
name=postForm
scope=request
validate=true
input=.message.Form
forward
name=success
path=.article.View/
/action
Do you see any problems?
--- Pedro Salgado [EMAIL PROTECTED] wrote:
On your struts config file check if the form bean
for StoreMessage action
is of type pkg.pkg.PostForm and if the action name
is pointing to the
correct form bean... It also seems to be missing the
import of the PostForm
on your action class.
Pedro Salgado
On 04/01/2004 03:22, Caroline Jen
[EMAIL PROTECTED] wrote:
The statement shown below encountered a
ClassCastException:
PostForm postForm = ( PostForm )form;
I cannot figure out the reason. Please help.
Allow me to show more code of the class where the
exception occurred:
...
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForm;
import org.apache.commons.beanutils.BeanUtils;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.artimus.message.PostBean;
import org.apache.artimus.message.ThreadBean;
import
org.apache.artimus.message.utility.DateUtil;
public final class StoreMessage extends Action
{
public ActionForward execute(ActionMapping
mapping,
ActionForm form,
HttpServletRequest
request,
HttpServletResponse
response)
throws Exception
{
int parentPostID;
int threadID;
int postID;
String postCreationIP;
String memberName = request.getRemoteUser();
Timestamp now =
DateUtil.getCurrentGMTTimestamp();
parentPostID = Integer.parseInt(
request.getParameter( parent ) );
PostForm postForm = ( PostForm )form;
}
}
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For additional commands
RE: Please Help - ClassCastException
Allow me to ask three more questions:
1. If I want to reset some specific text fields when
the JSP is re-displayed, do I code the PostForm.java
like this (please confirm):
code:
-
import org.apache.struts.validator.DynaValidatorForm;
import org.apache.struts.action.ActionMapping;
import javax.servlet.http.HttpServletRequest;
public class PostForm extends DynaValidatorForm
{
public void reset(ActionMapping mapping,
HttpServletRequest request)
{
super.reset( mapping, request );
set( receiver, new String() );
set( sender, new String() );
}
public PostForm () {}
}
---
2. if I want to reset all the text fields when the JSP
is re-displayed, do I code like this (please confirm):
code:
---
import org.apache.struts.validator.DynaValidatorForm;
import org.apache.struts.action.ActionMapping;
import javax.servlet.http.HttpServletRequest;
public class PostForm extends DynaValidatorForm
{
public void reset(ActionMapping mapping,
HttpServletRequest request)
{
initialize( mapping );
}
public PostForm () {}
}
--
3. What is the difference between
code:
---
form-bean
name=postForm
type=package.package.package.PostForm
form-property
name=receiver
type=java.lang.String/
form-property
name=sender
type=java.lang.String/
/form-bean
---
AND
code:
--
form-bean
name=postForm
type=org.apache.struts.validator.DynaValidatorForm
form-property
name=receiver
type=java.lang.String/
form-property
name=sender
type=java.lang.String/
/form-bean
---
Thank you very much.
--- Joe Hertz [EMAIL PROTECTED] wrote:
Not at all.
First off, set(String, String) is predefined for
you. You don't need to
create any of that. In fact, what you will find in a
DynaValidatorForm is
that your form classes start to get very sparse.
Here's really what it could
look like.
public class PostForm extends BaseDynaForm {
public void reset(ActionMapping actionMapping,
HttpServletRequest
httpServletRequest) {
// throw new UnsupportedOperationException(Method
is not
implemented);
}
public PostForm () {
}
}
In your ActionForm itself, beanUtils would work
something like this. All you
need is to get the right formBean object.
public ActionForward execute(ActionMapping
mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse
response) throws Exception {
PostForm pForm = (PostForm) form;
// other code you write here
BeanUtils.copyProperties(yourBean, pForm);
// etc
Doing it yourself without beanUtils?
Instead of calling getSender() and having a String
returned, you call get
(sender) and it will return an Object (cast it
yourself to whatever type
the sender form property really is). I made a base
form class with a
getString method that calls get() and does the
String cast for me to save the
tediom.
Making sense now?
-Original Message-
From: Caroline Jen [mailto:[EMAIL PROTECTED]
Sent: Sunday, January 04, 2004 2:46 AM
To: Struts Users Mailing List
Subject: RE: Please Help - ClassCastException
I am still confused...
I have a jsp that provides text fields for user to
fill out information. All the information is
passed
via HttpRequest and to be validated. And all the
properties in my PostForm are populated by the
information retrieved from those text fields.
And my PostForm is of
type=org.apache.struts.validator.DynaValidatorForm
Therefore, in my PostForm.java, I should do
something
like this? I just do not think the following code
is
correct.
==
import
org.apache.struts.validator.DynaValidatorForm;
public class PostForm extends DynaValidatorForm {
private String receiver;
private String sender;
public void set(String receiver, String
receiver);
public void set(String sender, String sender);
public String get(String receiver, String
receiver);
public String get(String sender, String
sender);
}
==
And you are saying that in my action class, I
should
...
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForward;
import
Re: Please Help - ClassCastException
On your struts config file check if the form bean for StoreMessage action
is of type pkg.pkg.PostForm and if the action name is pointing to the
correct form bean... It also seems to be missing the import of the PostForm
on your action class.
Pedro Salgado
On 04/01/2004 03:22, Caroline Jen [EMAIL PROTECTED] wrote:
The statement shown below encountered a
ClassCastException:
PostForm postForm = ( PostForm )form;
I cannot figure out the reason. Please help.
Allow me to show more code of the class where the
exception occurred:
...
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForm;
import org.apache.commons.beanutils.BeanUtils;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.artimus.message.PostBean;
import org.apache.artimus.message.ThreadBean;
import org.apache.artimus.message.utility.DateUtil;
public final class StoreMessage extends Action
{
public ActionForward execute(ActionMapping mapping,
ActionForm form,
HttpServletRequest
request,
HttpServletResponse
response)
throws Exception
{
int parentPostID;
int threadID;
int postID;
String postCreationIP;
String memberName = request.getRemoteUser();
Timestamp now =
DateUtil.getCurrentGMTTimestamp();
parentPostID = Integer.parseInt(
request.getParameter( parent ) );
PostForm postForm = ( PostForm )form;
}
}
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Re: Please Help - ClassCastException
Thank you for trying to help. I have added
import org.apache.artimus.message.PostForm;
to my action class. I do not fully follow what I
should check in the struts-config.xml file. And
should I use name=postForm with lowercase 'p' or
uppercase 'P'?
In my struts-config.xml file, I have:
form-bean
name=postForm
type=org.apache.struts.validator.DynaValidatorForm
form-property
name=receiver
type=java.lang.String/
form-property
name=sender
type=java.lang.String/
form-property
name=title
type=java.lang.String/
form-property
name=postTopic
type=java.lang.String/
form-property
name=postBody
type=java.lang.String/
/form-bean
and
action
roles=administrator,editor,contributor
path=/message/NewTopic
type=org.apache.artimus.message.StoreMessage
name=postForm
scope=request
validate=true
input=.message.Form
forward
name=success
path=.article.View/
/action
Do you see any problems?
--- Pedro Salgado [EMAIL PROTECTED] wrote:
On your struts config file check if the form bean
for StoreMessage action
is of type pkg.pkg.PostForm and if the action name
is pointing to the
correct form bean... It also seems to be missing the
import of the PostForm
on your action class.
Pedro Salgado
On 04/01/2004 03:22, Caroline Jen
[EMAIL PROTECTED] wrote:
The statement shown below encountered a
ClassCastException:
PostForm postForm = ( PostForm )form;
I cannot figure out the reason. Please help.
Allow me to show more code of the class where the
exception occurred:
...
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForm;
import org.apache.commons.beanutils.BeanUtils;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.artimus.message.PostBean;
import org.apache.artimus.message.ThreadBean;
import
org.apache.artimus.message.utility.DateUtil;
public final class StoreMessage extends Action
{
public ActionForward execute(ActionMapping
mapping,
ActionForm form,
HttpServletRequest
request,
HttpServletResponse
response)
throws Exception
{
int parentPostID;
int threadID;
int postID;
String postCreationIP;
String memberName = request.getRemoteUser();
Timestamp now =
DateUtil.getCurrentGMTTimestamp();
parentPostID = Integer.parseInt(
request.getParameter( parent ) );
PostForm postForm = ( PostForm )form;
}
}
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RE: Please Help - ClassCastException
Here is what I see (opinions vary)...
I see you are defining your form bean in your struts-config.xml as type
'org.apache.struts.validator.DynaValidatorForm'. So, why are you trying to
cast it as this 'org.apache.artimus.message.PostForm' class. Does that
class extend DynaValidatorForm? If it doesn't, you'll get a
ClassCastException like you're getting now. Personally, I expected you to
cast it as:
DynaValidatorForm postForm = (DynaValidatorForm) form;
Or us it as-initially defined (not casting like above) and use BeanUtils
such as:
String receiver = (String) PropertyUtils.getSimpleProperty(form,
receiver);
Regards,
David
-Original Message-
From: Caroline Jen [mailto:[EMAIL PROTECTED]
Sent: Saturday, January 03, 2004 11:04 PM
To: Struts Users Mailing List
Subject: Re: Please Help - ClassCastException
Thank you for trying to help. I have added
import org.apache.artimus.message.PostForm;
to my action class. I do not fully follow what I
should check in the struts-config.xml file. And
should I use name=postForm with lowercase 'p' or
uppercase 'P'?
In my struts-config.xml file, I have:
form-bean
name=postForm
type=org.apache.struts.validator.DynaValidatorForm
form-property
name=receiver
type=java.lang.String/
form-property
name=sender
type=java.lang.String/
form-property
name=title
type=java.lang.String/
form-property
name=postTopic
type=java.lang.String/
form-property
name=postBody
type=java.lang.String/
/form-bean
and
action
roles=administrator,editor,contributor
path=/message/NewTopic
type=org.apache.artimus.message.StoreMessage
name=postForm
scope=request
validate=true
input=.message.Form
forward
name=success
path=.article.View/
/action
Do you see any problems?
--- Pedro Salgado [EMAIL PROTECTED] wrote:
On your struts config file check if the form bean
for StoreMessage action
is of type pkg.pkg.PostForm and if the action name
is pointing to the
correct form bean... It also seems to be missing the
import of the PostForm
on your action class.
Pedro Salgado
On 04/01/2004 03:22, Caroline Jen
[EMAIL PROTECTED] wrote:
The statement shown below encountered a
ClassCastException:
PostForm postForm = ( PostForm )form;
I cannot figure out the reason. Please help.
Allow me to show more code of the class where the
exception occurred:
...
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForm;
import org.apache.commons.beanutils.BeanUtils;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.artimus.message.PostBean;
import org.apache.artimus.message.ThreadBean;
import
org.apache.artimus.message.utility.DateUtil;
public final class StoreMessage extends Action
{
public ActionForward execute(ActionMapping
mapping,
ActionForm form,
HttpServletRequest
request,
HttpServletResponse
response)
throws Exception
{
int parentPostID;
int threadID;
int postID;
String postCreationIP;
String memberName = request.getRemoteUser();
Timestamp now =
DateUtil.getCurrentGMTTimestamp();
parentPostID = Integer.parseInt(
request.getParameter( parent ) );
PostForm postForm = ( PostForm )form;
}
}
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http://search.yahoo.com/top2003
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To unsubscribe, e-mail:
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For additional commands, e-mail:
[EMAIL PROTECTED]
-
To unsubscribe, e-mail:
[EMAIL PROTECTED]
For additional commands, e-mail:
[EMAIL PROTECTED]
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Find out what made the Top Yahoo! Searches of 2003
http://search.yahoo.com/top2003
-
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
-
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
RE: Please Help - ClassCastException
I think that there are a lot more mistakes in my code
than I originally thought. The root of the problem is
that I do not know how to use DynaValidatorForm. If
you could help me in learning how to code when I am
working with DynaValidatorForm.
1. in my struts-config.xml, I have:
form-bean
name=postForm
type=org.apache.struts.validator.DynaValidatorForm
form-property
name=receiver
type=java.lang.String/
form-property
name=sender
type=java.lang.String/
.
.
/form-bean
2. My PostForm.java is like:
import org.apache.struts.validator.DynaValidatorForm;
import org.apache.struts.action.ActionMapping;
public class PostForm extends DynaValidatorForm {
private String receiver;
private String sender;
..
public void setReceiver( String receiver )
{
this.receiver = receiver;
}
public void setSender( String sender )
{
this.sender = sender;
}
public String getReceiver()
{
return receiver;
}
public String getSender()
{
return sender;
}
.
.
}
3. in my action class (see the code below)
3.1. do I cast the form to DynaActionForm? or I should
cast the form to DynaValidatorForm?
3.2. Can I use the copyProperties() method of the
BeanUtils to convert the form to a bean?
BeanUtils.copyProperties( threadBean, postForm );
...
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.DynaActionForm;
import org.apache.commons.beanutils.BeanUtils;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.artimus.message.PostForm;
import org.apache.artimus.message.PostBean;
import org.apache.artimus.message.ThreadBean;
import org.apache.artimus.message.utility.DateUtil;
public final class StoreMessage extends Action
{
public ActionForward execute(ActionMapping mapping,
ActionForm form,
HttpServletRequest
request,
HttpServletResponse
response)
throws Exception
{
int parentPostID;
int threadID;
String memberName = request.getRemoteUser();
Timestamp now =
DateUtil.getCurrentGMTTimestamp();
parentPostID = Integer.parseInt(
request.getParameter( parent ) );
DynaActionForm postForm = ( DynaActionForm
)form;
ThreadHandler thandler = new ThreadHandler();
ThreadBean threadBean = new ThreadBean();
BeanUtils.copyProperties( threadBean, postForm
);
if (parentPostID == 0 ) // new topic
{
threadBean.setLastPostMemberName( memberName
);
threadBean.setThreadCreationDate( now );
.
.
threadID = thandler.insertThread( threadBean
);
}
...
...
}
}
4. the action mapping in my struts-config.xml is like:
action
roles=administrator,editor,contributor
path=/message/NewTopic
type=org.apache.artimus.message.StoreMessage
name=postForm
scope=request
validate=true
input=.message.Form
forward
name=success
path=.article.View/
/action
Thank you.
--- David Friedman [EMAIL PROTECTED] wrote:
Here is what I see (opinions vary)...
I see you are defining your form bean in your
struts-config.xml as type
'org.apache.struts.validator.DynaValidatorForm'. So,
why are you trying to
cast it as this
'org.apache.artimus.message.PostForm' class. Does
that
class extend DynaValidatorForm? If it doesn't,
you'll get a
ClassCastException like you're getting now.
Personally, I expected you to
cast it as:
DynaValidatorForm postForm = (DynaValidatorForm)
form;
Or us it as-initially defined (not casting like
above) and use BeanUtils
such as:
String receiver = (String)
PropertyUtils.getSimpleProperty(form,
receiver);
Regards,
David
-Original Message-
From: Caroline Jen [mailto:[EMAIL PROTECTED]
Sent: Saturday, January 03, 2004 11:04 PM
To: Struts Users Mailing List
Subject: Re: Please Help - ClassCastException
Thank you for trying to help. I have added
import org.apache.artimus.message.PostForm;
to my action class. I do not fully follow what I
should check in the struts-config.xml file. And
should I use name=postForm with lowercase 'p' or
uppercase 'P'?
In my struts-config.xml file, I have:
form-bean
name=postForm
type=org.apache.struts.validator.DynaValidatorForm
form-property
name=receiver
type=java.lang.String/
form-property
name=sender
type=java.lang.String/
form-property
name
RE: Please Help - ClassCastException
Well, first off:
In your (dyna) form, you don't create setters and getters for the properties
though. With DynaForms you would say set(myPropertyName, myString)
instead of calling setMyPropertyName(myString). This is the Dyna part of
DynaForms. It's much less tedious IMHO.
In your action, you absolutely want to cast the form to PostForm. Otherwise
the form variable has no way to know properties are associated with it. So
yes, once you cast it to PostForm calls to BeanUtils.copyProperties() can and
will work properly.
Hope this helps,
-Joe
-Original Message-
From: Caroline Jen [mailto:[EMAIL PROTECTED]
Sent: Sunday, January 04, 2004 1:42 AM
To: Struts Users Mailing List
Subject: RE: Please Help - ClassCastException
I think that there are a lot more mistakes in my code
than I originally thought. The root of the problem is
that I do not know how to use DynaValidatorForm. If
you could help me in learning how to code when I am
working with DynaValidatorForm.
1. in my struts-config.xml, I have:
form-bean
name=postForm
type=org.apache.struts.validator.DynaValidatorForm
form-property
name=receiver
type=java.lang.String/
form-property
name=sender
type=java.lang.String/
.
.
/form-bean
2. My PostForm.java is like:
import org.apache.struts.validator.DynaValidatorForm;
import org.apache.struts.action.ActionMapping;
public class PostForm extends DynaValidatorForm {
private String receiver;
private String sender;
..
public void setReceiver( String receiver )
{
this.receiver = receiver;
}
public void setSender( String sender )
{
this.sender = sender;
}
public String getReceiver()
{
return receiver;
}
public String getSender()
{
return sender;
}
.
.
}
3. in my action class (see the code below)
3.1. do I cast the form to DynaActionForm? or I should
cast the form to DynaValidatorForm?
3.2. Can I use the copyProperties() method of the
BeanUtils to convert the form to a bean?
BeanUtils.copyProperties( threadBean, postForm );
...
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.DynaActionForm;
import org.apache.commons.beanutils.BeanUtils;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.artimus.message.PostForm;
import org.apache.artimus.message.PostBean;
import org.apache.artimus.message.ThreadBean;
import org.apache.artimus.message.utility.DateUtil;
public final class StoreMessage extends Action
{
public ActionForward execute(ActionMapping mapping,
ActionForm form,
HttpServletRequest
request,
HttpServletResponse
response)
throws Exception
{
int parentPostID;
int threadID;
String memberName = request.getRemoteUser();
Timestamp now =
DateUtil.getCurrentGMTTimestamp();
parentPostID = Integer.parseInt(
request.getParameter( parent ) );
DynaActionForm postForm = ( DynaActionForm
)form;
ThreadHandler thandler = new ThreadHandler();
ThreadBean threadBean = new ThreadBean();
BeanUtils.copyProperties( threadBean, postForm
);
if (parentPostID == 0 ) // new topic
{
threadBean.setLastPostMemberName( memberName
);
threadBean.setThreadCreationDate( now );
.
.
threadID = thandler.insertThread( threadBean
);
}
...
...
}
}
4. the action mapping in my struts-config.xml is like:
action
roles=administrator,editor,contributor
path=/message/NewTopic
type=org.apache.artimus.message.StoreMessage
name=postForm
scope=request
validate=true
input=.message.Form
forward
name=success
path=.article.View/
/action
Thank you.
--- David Friedman [EMAIL PROTECTED] wrote:
Here is what I see (opinions vary)...
I see you are defining your form bean in your struts-config.xml as
type 'org.apache.struts.validator.DynaValidatorForm'. So,
why are you trying to
cast it as this
'org.apache.artimus.message.PostForm' class. Does
that
class extend DynaValidatorForm? If it doesn't,
you'll get a
ClassCastException like you're getting now.
Personally, I expected you to
cast it as:
DynaValidatorForm postForm = (DynaValidatorForm)
form;
Or us it as-initially defined (not casting like
above) and use BeanUtils
