RE: All The Bean Properties Are Null in the Business Tier!!! (Used BeanUtils to Convert DynaValidatorForm)
Robert, I followed your advices. Your code works
very well. I have successfully inserted all the
values of my bean properties into the database. Thank
you very much.
--- Robert Taylor [EMAIL PROTECTED] wrote:
The same problem exists, you are calling getters on
a ThreadBean instance
which has not yet been populated.
Below three ways to accomplish your goal:
METHOD 1:
Try this (proxy):
public final class ThreadHandler {
MessageDAO md = new MySQLMessageDAO();
public int insertThread(ThreadBean bean)
throws throws MessageDAOSysException,
ObjectNotFoundException {
int identity = 0;
md.createThread(bean.getReceiver(),
bean.getSender(),
bean.getThreadTopic(),
bean.getThreadBody(),
bean.getThreadCreationDate(),
bean.getThreadViewCount(),
bean.getThreadReplyCount());
// get identity
return identity;
}
}
ThreadBean bean = new ThreadBean();
BeanUtils.copyProperties(bean, postForm);
ThreadHandler th = new ThreadHandler()
th.insertThread(bean);
If you do it this way, then it would be better if
ThreadHandler was a
singleton,
but that's a different discussion :)
METHOD 2:
Another way to do it (design by composition).
public final class ThreadHandler {
MessageDAO md = new MySQLMessageDAO();
ThreadBean bean;
public ThreadHandler(ThreadBean bean) {
this.bean = bean;
}
public int insertThread()
throws throws MessageDAOSysException,
ObjectNotFoundException {
int identity = 0;
md.createThread(bean.getReceiver(),
bean.getSender(),
bean.getThreadTopic(),
bean.getThreadBody(),
bean.getThreadCreationDate(),
bean.getThreadViewCount(),
bean.getThreadReplyCount());
// get identity
return identity;
}
}
ThreadBean bean = new ThreadBean();
BeanUtils.copyProperties(bean, postForm);
ThreadHandler th = new ThreadHandler(bean)
th.insertThread();
METHOD 3:
Yet another way via classic inheritance:
public final class ThreadHandler
extends ThreadBean {
MessageDAO md = new MySQLMessageDAO();
public ThreadHandler() {
super();
}
public int insertThread()
throws throws MessageDAOSysException,
ObjectNotFoundException {
int identity = 0;
md.createThread(this.getReceiver(),
this.getSender(),
this.getThreadTopic(),
this.getThreadBody(),
this.getThreadCreationDate(),
this.getThreadViewCount(),
this.getThreadReplyCount());
// get identity
return identity;
}
}
ThreadHandler th = new ThreadHandler();
BeanUtils.copyProperties(th, postForm);
th.insertThread();
hth,
robert
-Original Message-
From: Caroline Jen [mailto:[EMAIL PROTECTED]
Sent: Thursday, January 08, 2004 11:48 AM
To: Struts Users Mailing List
Subject: RE: All The Bean Properties Are Null in
the Business Tier!!!
(Used BeanUtils to Convert DynaValidatorForm)
Thank you for your comment, which is very helpful.
Instead of extends ThreadBean, I now import the
ThreadBean into my ThreadHandler class (see the
code
below). I am still getting all null or zero values
from the bean.
What is the proper way to do it? I simply want to
insert the value of all the properties into the
database. Most of the fields in my database
require
NOT NULL.
code:
==
import org.apache.artimus.message.ThreadBean;
class ThreadHandler
{
ThreadBean threadBean = new ThreadBean();
String receiver = threadBean.getReceiver();
String sender = threadBean.getSender();
String threadTopic = threadBean.getPostTopic();
String threadBody = threadBean.getPostBody();
Timestamp threadCreationDate =
threadBean.getThreadCreationDate();
int threadViewCount =
threadBean.getThreadViewCount();
int threadReplyCount =
threadBean.getThreadReplyCount();
MessageDAO md = new MySQLMessageDAO();
public int insertThread( ThreadBean threadBean
)
throws
MessageDAOSysException,
ObjectNotFoundException
{
System.out.println( The sender is +
sender +
. );
System.out.println( The subject is +
threadTopic + . );
System.out.println( The creation date is
+
threadCreationDate );
System.out.println( The number of replies
are
=== message truncated ===
__
Do you Yahoo!?
Yahoo! Hotjobs: Enter the Signing
RE: All The Bean Properties Are Null in the Business Tier!!! (Used BeanUtils to Convert DynaValidatorForm)
Glad it worked for you.
robert
-Original Message-
From: Caroline Jen [mailto:[EMAIL PROTECTED]
Sent: Friday, January 09, 2004 5:12 PM
To: Struts Users Mailing List
Subject: RE: All The Bean Properties Are Null in the Business Tier!!!
(Used BeanUtils to Convert DynaValidatorForm)
Robert, I followed your advices. Your code works
very well. I have successfully inserted all the
values of my bean properties into the database. Thank
you very much.
--- Robert Taylor [EMAIL PROTECTED] wrote:
The same problem exists, you are calling getters on
a ThreadBean instance
which has not yet been populated.
Below three ways to accomplish your goal:
METHOD 1:
Try this (proxy):
public final class ThreadHandler {
MessageDAO md = new MySQLMessageDAO();
public int insertThread(ThreadBean bean)
throws throws MessageDAOSysException,
ObjectNotFoundException {
int identity = 0;
md.createThread(bean.getReceiver(),
bean.getSender(),
bean.getThreadTopic(),
bean.getThreadBody(),
bean.getThreadCreationDate(),
bean.getThreadViewCount(),
bean.getThreadReplyCount());
// get identity
return identity;
}
}
ThreadBean bean = new ThreadBean();
BeanUtils.copyProperties(bean, postForm);
ThreadHandler th = new ThreadHandler()
th.insertThread(bean);
If you do it this way, then it would be better if
ThreadHandler was a
singleton,
but that's a different discussion :)
METHOD 2:
Another way to do it (design by composition).
public final class ThreadHandler {
MessageDAO md = new MySQLMessageDAO();
ThreadBean bean;
public ThreadHandler(ThreadBean bean) {
this.bean = bean;
}
public int insertThread()
throws throws MessageDAOSysException,
ObjectNotFoundException {
int identity = 0;
md.createThread(bean.getReceiver(),
bean.getSender(),
bean.getThreadTopic(),
bean.getThreadBody(),
bean.getThreadCreationDate(),
bean.getThreadViewCount(),
bean.getThreadReplyCount());
// get identity
return identity;
}
}
ThreadBean bean = new ThreadBean();
BeanUtils.copyProperties(bean, postForm);
ThreadHandler th = new ThreadHandler(bean)
th.insertThread();
METHOD 3:
Yet another way via classic inheritance:
public final class ThreadHandler
extends ThreadBean {
MessageDAO md = new MySQLMessageDAO();
public ThreadHandler() {
super();
}
public int insertThread()
throws throws MessageDAOSysException,
ObjectNotFoundException {
int identity = 0;
md.createThread(this.getReceiver(),
this.getSender(),
this.getThreadTopic(),
this.getThreadBody(),
this.getThreadCreationDate(),
this.getThreadViewCount(),
this.getThreadReplyCount());
// get identity
return identity;
}
}
ThreadHandler th = new ThreadHandler();
BeanUtils.copyProperties(th, postForm);
th.insertThread();
hth,
robert
-Original Message-
From: Caroline Jen [mailto:[EMAIL PROTECTED]
Sent: Thursday, January 08, 2004 11:48 AM
To: Struts Users Mailing List
Subject: RE: All The Bean Properties Are Null in
the Business Tier!!!
(Used BeanUtils to Convert DynaValidatorForm)
Thank you for your comment, which is very helpful.
Instead of extends ThreadBean, I now import the
ThreadBean into my ThreadHandler class (see the
code
below). I am still getting all null or zero values
from the bean.
What is the proper way to do it? I simply want to
insert the value of all the properties into the
database. Most of the fields in my database
require
NOT NULL.
code:
==
import org.apache.artimus.message.ThreadBean;
class ThreadHandler
{
ThreadBean threadBean = new ThreadBean();
String receiver = threadBean.getReceiver();
String sender = threadBean.getSender();
String threadTopic = threadBean.getPostTopic();
String threadBody = threadBean.getPostBody();
Timestamp threadCreationDate =
threadBean.getThreadCreationDate();
int threadViewCount =
threadBean.getThreadViewCount();
int threadReplyCount =
threadBean.getThreadReplyCount();
MessageDAO md = new MySQLMessageDAO();
public int insertThread( ThreadBean threadBean
)
RE: All The Bean Properties Are Null in the Business Tier!!! (Used BeanUtils to Convert DynaValidatorForm)
Your code seems a bit confusing based upon what you want to
achieve.
If indeed you want ThreadHandler to inherit from ThreadBean,
you should be able to do something like this:
DynaActionForm postForm = ( DynaActionForm )form;
ThreadHander = new ThreadHandler();
BeanUtils.copyProperties( threadHandler, postForm );
threadHandler.insertThread();
The reason you are getting null and zero values in ThreadHandler
is that you are populating a new instance of ThreadBean here:
DynaActionForm postForm = ( DynaActionForm )form;
ThreadBean threadBean = new ThreadBean();
BeanUtils.copyProperties( threadBean, postForm );
... and then you get a new instance of ThreadHandler here:
ThreadHandler thandler = new ThreadHandler();
At this point, ThreadHandler knows nothing of your populated
instance of ThreadBean. Instead it is getting values from
its own empty ThreadBean parent here:
class ThreadHandler extends ThreadBean
{
String receiver = getReceiver();
String sender = getSender();
String threadTopic = getPostTopic();
String threadBody = getPostBody();
Timestamp threadCreationDate =
getThreadCreationDate();
int threadViewCount = getThreadViewCount();
int threadReplyCount = getThreadReplyCount();
.
.
}
...unless you do something like the following in
ThreadHandler.insertThread():
public int insertThread(ThreadBean bean) throws SomeException {
this.receiver = bean.getReceiver();
this.sender = bean.getSender();
// insert code here
}
which from a design perspective, I'm not sure why you would want to do it
this way.
hth,
robert
-Original Message-
From: Caroline Jen [mailto:[EMAIL PROTECTED]
Sent: Wednesday, January 07, 2004 10:27 PM
To: Struts Users Mailing List
Subject: RE: All The Bean Properties Are Null in the Business Tier!!!
(Used BeanUtils to Convert DynaValidatorForm)
I have narrowed down the problem. Something went
wrong in my business tier class (ThreadHandler.java).
All the properties in the JavaBean are populated
properly (I have checked). The way I coded in the
ThreadHandler class failed to retrieve the value of
all the properties in the JavaBean (ThreadBean.java).
All the values turned out to be null or 0. Now, what
is wrong with the code?
class ThreadHandler extends ThreadBean
{
String receiver = getReceiver();
String sender = getSender();
String threadTopic = getPostTopic();
String threadBody = getPostBody();
Timestamp threadCreationDate =
getThreadCreationDate();
int threadViewCount = getThreadViewCount();
int threadReplyCount = getThreadReplyCount();
.
.
}
To answer your question:
1. Have you checked to make sure that the fields you
expect actually exist in the form before calling
BeanUtils.copyProperties()?
Yes, I have printed out the contents of the JSP text
fields in my action class, which is a servlet. For
example: System.out.println( the sender is +
postForm.get( sender ) );
2. If so, have you checked to see if the data was
copied properly just after BeanUtils.copyProperties()?
Yes, I have also printed out the value of the bean
properties. For example: System.out.println( the
sender is + threadBean.getSender() );
3. BeanUtils.copyProperties() uses reflection to copy
properties. Are you using proper JavaBeans naming
convention?
Yes, I used a pair of get and set methods for each
properties in the JavaBean (ThreadBean.java). And in
my action class, I could print out the value of those
properties.
--- Robert Taylor [EMAIL PROTECTED] wrote:
Have you checked to make sure that the fields you
expect
actually exist in the form before calling
BeanUtils.populate()?
If so, have you checked to see if the data was
copied properly
just after BeanUtils.populate()?
BeanUtils.populate() uses reflection to copy
properties.
Are you usingproper JavaBeans naming convention?
Try and isolate exactly where the data is getting
lost.
I use BeanUtils.populate() all the time with
DynaForms and
have no problems. Usually when I do, I find that my
data member
names don't correspond.
robert
-Original Message-
From: Caroline Jen [mailto:[EMAIL PROTECTED]
Sent: Wednesday, January 07, 2004 1:42 PM
To: [EMAIL PROTECTED]
Subject: All The Bean Properties Are Null in the
Business Tier!!! (Used
BeanUtils to Convert DynaValidatorForm)
Hi, my program compiled OKay. When I ran the
application, somehow, the properties of my
DynaValidatorForm are not passed from the action
class
to the business tier and then to the data access
tier.
Please help me taking a look at what went wrong.
It looks that the validation worked fine:
form-bean
name=postForm
type=org.apache.struts.validator.DynaValidatorForm
form-property
name=receiver
type=java.lang.String/
RE: All The Bean Properties Are Null in the Business Tier!!! (Used BeanUtils to Convert DynaValidatorForm)
Thank you for your comment, which is very helpful.
Instead of extends ThreadBean, I now import the
ThreadBean into my ThreadHandler class (see the code
below). I am still getting all null or zero values
from the bean.
What is the proper way to do it? I simply want to
insert the value of all the properties into the
database. Most of the fields in my database require
NOT NULL.
code:
==
import org.apache.artimus.message.ThreadBean;
class ThreadHandler
{
ThreadBean threadBean = new ThreadBean();
String receiver = threadBean.getReceiver();
String sender = threadBean.getSender();
String threadTopic = threadBean.getPostTopic();
String threadBody = threadBean.getPostBody();
Timestamp threadCreationDate =
threadBean.getThreadCreationDate();
int threadViewCount =
threadBean.getThreadViewCount();
int threadReplyCount =
threadBean.getThreadReplyCount();
MessageDAO md = new MySQLMessageDAO();
public int insertThread( ThreadBean threadBean )
throws MessageDAOSysException,
ObjectNotFoundException
{
System.out.println( The sender is + sender +
. );
System.out.println( The subject is +
threadTopic + . );
System.out.println( The creation date is +
threadCreationDate );
System.out.println( The number of replies are
+ threadReplyCount );
md.createThread( receiver, sender, threadTopic,
threadBody, threadCreationDate,
threadViewCount,
threadReplyCount );
int threadID = 0;
.
.
return threadID;
}
}
--- Robert Taylor [EMAIL PROTECTED] wrote:
Your code seems a bit confusing based upon what you
want to
achieve.
If indeed you want ThreadHandler to inherit from
ThreadBean,
you should be able to do something like this:
DynaActionForm postForm = ( DynaActionForm )form;
ThreadHander = new ThreadHandler();
BeanUtils.copyProperties( threadHandler, postForm );
threadHandler.insertThread();
The reason you are getting null and zero values in
ThreadHandler
is that you are populating a new instance of
ThreadBean here:
DynaActionForm postForm = ( DynaActionForm
)form;
ThreadBean threadBean = new ThreadBean();
BeanUtils.copyProperties( threadBean, postForm
);
... and then you get a new instance of ThreadHandler
here:
ThreadHandler thandler = new ThreadHandler();
At this point, ThreadHandler knows nothing of your
populated
instance of ThreadBean. Instead it is getting values
from
its own empty ThreadBean parent here:
class ThreadHandler extends ThreadBean
{
String receiver = getReceiver();
String sender = getSender();
String threadTopic = getPostTopic();
String threadBody = getPostBody();
Timestamp threadCreationDate =
getThreadCreationDate();
int threadViewCount = getThreadViewCount();
int threadReplyCount = getThreadReplyCount();
.
.
}
...unless you do something like the following in
ThreadHandler.insertThread():
public int insertThread(ThreadBean bean) throws
SomeException {
this.receiver = bean.getReceiver();
this.sender = bean.getSender();
// insert code here
}
which from a design perspective, I'm not sure why
you would want to do it
this way.
hth,
robert
-Original Message-
From: Caroline Jen [mailto:[EMAIL PROTECTED]
Sent: Wednesday, January 07, 2004 10:27 PM
To: Struts Users Mailing List
Subject: RE: All The Bean Properties Are Null in
the Business Tier!!!
(Used BeanUtils to Convert DynaValidatorForm)
I have narrowed down the problem. Something went
wrong in my business tier class
(ThreadHandler.java).
All the properties in the JavaBean are populated
properly (I have checked). The way I coded in the
ThreadHandler class failed to retrieve the value
of
all the properties in the JavaBean
(ThreadBean.java).
All the values turned out to be null or 0. Now,
what
is wrong with the code?
class ThreadHandler extends ThreadBean
{
String receiver = getReceiver();
String sender = getSender();
String threadTopic = getPostTopic();
String threadBody = getPostBody();
Timestamp threadCreationDate =
getThreadCreationDate();
int threadViewCount = getThreadViewCount();
int threadReplyCount = getThreadReplyCount();
.
.
}
To answer your question:
1. Have you checked to make sure that the fields
you
expect actually exist in the form before calling
BeanUtils.copyProperties()?
Yes, I have printed out the contents of the JSP
text
fields in my action class, which is a servlet.
For
example: System.out.println( the sender is +
postForm.get( sender ) );
2. If so, have you checked to see if the data was
copied properly just after
RE: All The Bean Properties Are Null in the Business Tier!!! (Used BeanUtils to Convert DynaValidatorForm)
The same problem exists, you are calling getters on a ThreadBean instance
which has not yet been populated.
Below three ways to accomplish your goal:
METHOD 1:
Try this (proxy):
public final class ThreadHandler {
MessageDAO md = new MySQLMessageDAO();
public int insertThread(ThreadBean bean)
throws throws MessageDAOSysException, ObjectNotFoundException {
int identity = 0;
md.createThread(bean.getReceiver(),
bean.getSender(),
bean.getThreadTopic(),
bean.getThreadBody(),
bean.getThreadCreationDate(),
bean.getThreadViewCount(),
bean.getThreadReplyCount());
// get identity
return identity;
}
}
ThreadBean bean = new ThreadBean();
BeanUtils.copyProperties(bean, postForm);
ThreadHandler th = new ThreadHandler()
th.insertThread(bean);
If you do it this way, then it would be better if ThreadHandler was a
singleton,
but that's a different discussion :)
METHOD 2:
Another way to do it (design by composition).
public final class ThreadHandler {
MessageDAO md = new MySQLMessageDAO();
ThreadBean bean;
public ThreadHandler(ThreadBean bean) {
this.bean = bean;
}
public int insertThread()
throws throws MessageDAOSysException, ObjectNotFoundException {
int identity = 0;
md.createThread(bean.getReceiver(),
bean.getSender(),
bean.getThreadTopic(),
bean.getThreadBody(),
bean.getThreadCreationDate(),
bean.getThreadViewCount(),
bean.getThreadReplyCount());
// get identity
return identity;
}
}
ThreadBean bean = new ThreadBean();
BeanUtils.copyProperties(bean, postForm);
ThreadHandler th = new ThreadHandler(bean)
th.insertThread();
METHOD 3:
Yet another way via classic inheritance:
public final class ThreadHandler
extends ThreadBean {
MessageDAO md = new MySQLMessageDAO();
public ThreadHandler() {
super();
}
public int insertThread()
throws throws MessageDAOSysException, ObjectNotFoundException {
int identity = 0;
md.createThread(this.getReceiver(),
this.getSender(),
this.getThreadTopic(),
this.getThreadBody(),
this.getThreadCreationDate(),
this.getThreadViewCount(),
this.getThreadReplyCount());
// get identity
return identity;
}
}
ThreadHandler th = new ThreadHandler();
BeanUtils.copyProperties(th, postForm);
th.insertThread();
hth,
robert
-Original Message-
From: Caroline Jen [mailto:[EMAIL PROTECTED]
Sent: Thursday, January 08, 2004 11:48 AM
To: Struts Users Mailing List
Subject: RE: All The Bean Properties Are Null in the Business Tier!!!
(Used BeanUtils to Convert DynaValidatorForm)
Thank you for your comment, which is very helpful.
Instead of extends ThreadBean, I now import the
ThreadBean into my ThreadHandler class (see the code
below). I am still getting all null or zero values
from the bean.
What is the proper way to do it? I simply want to
insert the value of all the properties into the
database. Most of the fields in my database require
NOT NULL.
code:
==
import org.apache.artimus.message.ThreadBean;
class ThreadHandler
{
ThreadBean threadBean = new ThreadBean();
String receiver = threadBean.getReceiver();
String sender = threadBean.getSender();
String threadTopic = threadBean.getPostTopic();
String threadBody = threadBean.getPostBody();
Timestamp threadCreationDate =
threadBean.getThreadCreationDate();
int threadViewCount =
threadBean.getThreadViewCount();
int threadReplyCount =
threadBean.getThreadReplyCount();
MessageDAO md = new MySQLMessageDAO();
public int insertThread( ThreadBean threadBean )
throws MessageDAOSysException,
ObjectNotFoundException
{
System.out.println( The sender is + sender +
. );
System.out.println( The subject is +
threadTopic + . );
System.out.println( The creation date is +
threadCreationDate );
System.out.println( The number of replies are
+ threadReplyCount );
md.createThread( receiver, sender, threadTopic,
threadBody, threadCreationDate,
threadViewCount,
threadReplyCount );
int threadID = 0;
.
.
return threadID;
}
}
--- Robert Taylor [EMAIL PROTECTED] wrote:
Your code seems a bit confusing based upon what you
want to
achieve.
If indeed you want ThreadHandler to inherit from
ThreadBean,
you should be able to do
RE: All The Bean Properties Are Null in the Business Tier!!! (Used BeanUtils to Convert DynaValidatorForm)
I don't think ThreadHandler represents a java.lang.Thread handler.
I think it more or less is a business object to facilitate persistance.
I think the use of the word Thread here is more representative of a
forum discussion thread.
I could be wrong though.
robert
-Original Message-
From: Yee, Richard K,,DMDCWEST [mailto:[EMAIL PROTECTED]
Sent: Thursday, January 08, 2004 12:00 PM
To: 'Struts Users Mailing List'
Subject: RE: All The Bean Properties Are Null in the Business Tier!!!
(Used BeanUtils to Convert DynaValidatorForm)
Caroline,
May I ask why you are performing your database updates through a separate
thread? It seems to be complicating your code. Creating lots of
threads from
within your web application is not a good practice if you want your app to
scale well. Also, what happens if the update doesn't succeed? You have no
way of notifying the user.
The code:
snip
ThreadBean threadBean = new ThreadBean();
String receiver = threadBean.getReceiver();
String sender = threadBean.getSender();
/snip
is your problem unless your ThreadBean constructor can populate itself
correctly with the desired values.
If you must use threads, then you should be able to create a
ThreadHandler,
call a setter method on it and set you ThreadBean instance variable, and
then call the run method on the ThreadHandler to start the thread.
Regards,
Richard
-Original Message-
From: Caroline Jen [mailto:[EMAIL PROTECTED]
Sent: Thursday, January 08, 2004 8:48 AM
To: Struts Users Mailing List
Subject: RE: All The Bean Properties Are Null in the Business
Tier!!! (Used
BeanUtils to Convert DynaValidatorForm)
Thank you for your comment, which is very helpful.
Instead of extends ThreadBean, I now import the
ThreadBean into my ThreadHandler class (see the code
below). I am still getting all null or zero values
from the bean.
What is the proper way to do it? I simply want to
insert the value of all the properties into the
database. Most of the fields in my database require
NOT NULL.
code:
==
import org.apache.artimus.message.ThreadBean;
class ThreadHandler
{
ThreadBean threadBean = new ThreadBean();
String receiver = threadBean.getReceiver();
String sender = threadBean.getSender();
String threadTopic = threadBean.getPostTopic();
String threadBody = threadBean.getPostBody();
Timestamp threadCreationDate = threadBean.getThreadCreationDate();
int threadViewCount =
threadBean.getThreadViewCount();
int threadReplyCount =
threadBean.getThreadReplyCount();
MessageDAO md = new MySQLMessageDAO();
public int insertThread( ThreadBean threadBean )
throws MessageDAOSysException,
ObjectNotFoundException
{
System.out.println( The sender is + sender +
. );
System.out.println( The subject is +
threadTopic + . );
System.out.println( The creation date is + threadCreationDate );
System.out.println( The number of replies are
+ threadReplyCount );
md.createThread( receiver, sender, threadTopic,
threadBody, threadCreationDate,
threadViewCount,
threadReplyCount );
int threadID = 0;
.
.
return threadID;
}
}
--- Robert Taylor [EMAIL PROTECTED] wrote:
Your code seems a bit confusing based upon what you
want to
achieve.
If indeed you want ThreadHandler to inherit from
ThreadBean,
you should be able to do something like this:
DynaActionForm postForm = ( DynaActionForm )form; ThreadHander = new
ThreadHandler(); BeanUtils.copyProperties( threadHandler, postForm );
threadHandler.insertThread();
The reason you are getting null and zero values in ThreadHandler
is that you are populating a new instance of
ThreadBean here:
DynaActionForm postForm = ( DynaActionForm
)form;
ThreadBean threadBean = new ThreadBean();
BeanUtils.copyProperties( threadBean, postForm
);
... and then you get a new instance of ThreadHandler
here:
ThreadHandler thandler = new ThreadHandler();
At this point, ThreadHandler knows nothing of your
populated
instance of ThreadBean. Instead it is getting values
from
its own empty ThreadBean parent here:
class ThreadHandler extends ThreadBean
{
String receiver = getReceiver();
String sender = getSender();
String threadTopic = getPostTopic();
String threadBody = getPostBody();
Timestamp threadCreationDate =
getThreadCreationDate();
int threadViewCount = getThreadViewCount();
int threadReplyCount = getThreadReplyCount();
.
.
}
...unless you do something like the following in
ThreadHandler.insertThread():
public int insertThread(ThreadBean bean) throws
SomeException {
this.receiver
RE: All The Bean Properties Are Null in the Business Tier!!! (Used BeanUtils to Convert DynaValidatorForm)
Robert, you are absolutely right. I am trying to
build a personal message inbox using Struts. I use
the word Thread to represent a discussion topic. My
ThreadHandler is a business tier class. The word
Thread has nothing to do with the java.lang.Thread.
-Caroline
--- Robert Taylor [EMAIL PROTECTED] wrote:
I don't think ThreadHandler represents a
java.lang.Thread handler.
I think it more or less is a business object to
facilitate persistance.
I think the use of the word Thread here is more
representative of a
forum discussion thread.
I could be wrong though.
robert
-Original Message-
From: Yee, Richard K,,DMDCWEST
[mailto:[EMAIL PROTECTED]
Sent: Thursday, January 08, 2004 12:00 PM
To: 'Struts Users Mailing List'
Subject: RE: All The Bean Properties Are Null in
the Business Tier!!!
(Used BeanUtils to Convert DynaValidatorForm)
Caroline,
May I ask why you are performing your database
updates through a separate
thread? It seems to be complicating your code.
Creating lots of
threads from
within your web application is not a good practice
if you want your app to
scale well. Also, what happens if the update
doesn't succeed? You have no
way of notifying the user.
The code:
snip
ThreadBean threadBean = new ThreadBean();
String receiver = threadBean.getReceiver();
String sender = threadBean.getSender();
/snip
is your problem unless your ThreadBean constructor
can populate itself
correctly with the desired values.
If you must use threads, then you should be able
to create a
ThreadHandler,
call a setter method on it and set you ThreadBean
instance variable, and
then call the run method on the ThreadHandler to
start the thread.
Regards,
Richard
-Original Message-
From: Caroline Jen [mailto:[EMAIL PROTECTED]
Sent: Thursday, January 08, 2004 8:48 AM
To: Struts Users Mailing List
Subject: RE: All The Bean Properties Are Null in
the Business
Tier!!! (Used
BeanUtils to Convert DynaValidatorForm)
Thank you for your comment, which is very helpful.
Instead of extends ThreadBean, I now import the
ThreadBean into my ThreadHandler class (see the
code
below). I am still getting all null or zero values
from the bean.
What is the proper way to do it? I simply want to
insert the value of all the properties into the
database. Most of the fields in my database
require
NOT NULL.
code:
==
import org.apache.artimus.message.ThreadBean;
class ThreadHandler
{
ThreadBean threadBean = new ThreadBean();
String receiver = threadBean.getReceiver();
String sender = threadBean.getSender();
String threadTopic = threadBean.getPostTopic();
String threadBody = threadBean.getPostBody();
Timestamp threadCreationDate =
threadBean.getThreadCreationDate();
int threadViewCount =
threadBean.getThreadViewCount();
int threadReplyCount =
threadBean.getThreadReplyCount();
MessageDAO md = new MySQLMessageDAO();
public int insertThread( ThreadBean threadBean
)
throws
MessageDAOSysException,
ObjectNotFoundException
{
System.out.println( The sender is +
sender +
. );
System.out.println( The subject is +
threadTopic + . );
System.out.println( The creation date is
+ threadCreationDate );
System.out.println( The number of replies
are
+ threadReplyCount );
md.createThread( receiver, sender,
threadTopic,
threadBody,
threadCreationDate,
threadViewCount,
threadReplyCount );
int threadID = 0;
.
.
return threadID;
}
}
--- Robert Taylor [EMAIL PROTECTED] wrote:
Your code seems a bit confusing based upon what
you
want to
achieve.
If indeed you want ThreadHandler to inherit from
ThreadBean,
you should be able to do something like this:
DynaActionForm postForm = ( DynaActionForm
)form; ThreadHander = new
ThreadHandler(); BeanUtils.copyProperties(
threadHandler, postForm );
threadHandler.insertThread();
The reason you are getting null and zero values
in ThreadHandler
is that you are populating a new instance of
ThreadBean here:
DynaActionForm postForm = ( DynaActionForm
)form;
ThreadBean threadBean = new ThreadBean();
BeanUtils.copyProperties( threadBean,
postForm
);
... and then you get a new instance of
ThreadHandler
here:
ThreadHandler thandler = new
ThreadHandler();
At this point, ThreadHandler knows nothing of
your
populated
instance of ThreadBean. Instead it is getting
values
from
its own empty ThreadBean parent here:
class ThreadHandler extends ThreadBean
{
String receiver = getReceiver();
RE: All The Bean Properties Are Null in the Business Tier!!! (Used BeanUtils to Convert DynaValidatorForm)
Have you checked to make sure that the fields you expect
actually exist in the form before calling BeanUtils.populate()?
If so, have you checked to see if the data was copied properly
just after BeanUtils.populate()?
BeanUtils.populate() uses reflection to copy properties.
Are you usingproper JavaBeans naming convention?
Try and isolate exactly where the data is getting lost.
I use BeanUtils.populate() all the time with DynaForms and
have no problems. Usually when I do, I find that my data member
names don't correspond.
robert
-Original Message-
From: Caroline Jen [mailto:[EMAIL PROTECTED]
Sent: Wednesday, January 07, 2004 1:42 PM
To: [EMAIL PROTECTED]
Subject: All The Bean Properties Are Null in the Business Tier!!! (Used
BeanUtils to Convert DynaValidatorForm)
Hi, my program compiled OKay. When I ran the
application, somehow, the properties of my
DynaValidatorForm are not passed from the action class
to the business tier and then to the data access tier.
Please help me taking a look at what went wrong.
It looks that the validation worked fine:
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
because when I intentionally left several of the text
fields blank and submitted my JSP form, an applet got
prompted showing something in those fields are
required.
In my action class (see below), I used BeanUtils to
copy all the properties of the DynaValidatorForm to a
bean (ThreadBean):
DynaActionForm postForm = ( DynaActionForm )form;
ThreadBean threadBean = new ThreadBean();
BeanUtils.copyProperties( threadBean, postForm );
I then added a number of properties with pre-defined
values to the ThreadBean in the Action class:
Timestamp now = DateUtil.getCurrentGMTTimestamp();
threadBean.setThreadCreationDate( now );
threadBean.setThreadViewCount( 0 );
I then called a method in a service class
ThreadHandler and passing threadBean as the parameter
of that method:
ThreadHandler thandler = new ThreadHandler();
threadID = thandler.insertThread( threadBean );
In the ThreadHandler class (see below), I first tried
to retrieve the values of those properties from the
ThreadBean. I FOUND OUT ALL THOSE VALUES ARE NULL!
class ThreadHandler extends ThreadBean
{
int threadID = getThreadID();
String receiver = getReceiver();
String sender = getSender();
Timestamp threadCreationDate =
getThreadCreationDate();
int threadViewCount = getThreadViewCount();
public ThreadHandler() {}
MessageDAO md = new MySQLMessageDAO();
public int insertThread( ThreadBean threadBean )
throws
MessageDAOSysException, ObjectNotFoundException
{
md.createThread( receiver, sender,
threadCreationDate, threadViewCount
);
.
.
return threadID;
}
}
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RE: All The Bean Properties Are Null in the Business Tier!!! (Used BeanUtils to Convert DynaValidatorForm)
What does BeanUtils.populate(); do? I used
BeanUtils.copyProperties();
Does it make any difference?
--- Robert Taylor [EMAIL PROTECTED] wrote:
Have you checked to make sure that the fields you
expect
actually exist in the form before calling
BeanUtils.populate()?
If so, have you checked to see if the data was
copied properly
just after BeanUtils.populate()?
BeanUtils.populate() uses reflection to copy
properties.
Are you usingproper JavaBeans naming convention?
Try and isolate exactly where the data is getting
lost.
I use BeanUtils.populate() all the time with
DynaForms and
have no problems. Usually when I do, I find that my
data member
names don't correspond.
robert
-Original Message-
From: Caroline Jen [mailto:[EMAIL PROTECTED]
Sent: Wednesday, January 07, 2004 1:42 PM
To: [EMAIL PROTECTED]
Subject: All The Bean Properties Are Null in the
Business Tier!!! (Used
BeanUtils to Convert DynaValidatorForm)
Hi, my program compiled OKay. When I ran the
application, somehow, the properties of my
DynaValidatorForm are not passed from the action
class
to the business tier and then to the data access
tier.
Please help me taking a look at what went wrong.
It looks that the validation worked fine:
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
because when I intentionally left several of the
text
fields blank and submitted my JSP form, an applet
got
prompted showing something in those fields are
required.
In my action class (see below), I used BeanUtils
to
copy all the properties of the DynaValidatorForm
to a
bean (ThreadBean):
DynaActionForm postForm = ( DynaActionForm )form;
ThreadBean threadBean = new ThreadBean();
BeanUtils.copyProperties( threadBean, postForm );
I then added a number of properties with
pre-defined
values to the ThreadBean in the Action class:
Timestamp now = DateUtil.getCurrentGMTTimestamp();
threadBean.setThreadCreationDate( now );
threadBean.setThreadViewCount( 0 );
I then called a method in a service class
ThreadHandler and passing threadBean as the
parameter
of that method:
ThreadHandler thandler = new ThreadHandler();
threadID = thandler.insertThread( threadBean );
In the ThreadHandler class (see below), I first
tried
to retrieve the values of those properties from
the
ThreadBean. I FOUND OUT ALL THOSE VALUES ARE
NULL!
class ThreadHandler extends ThreadBean
{
int threadID = getThreadID();
String receiver = getReceiver();
String sender = getSender();
Timestamp threadCreationDate =
getThreadCreationDate();
int threadViewCount = getThreadViewCount();
public ThreadHandler() {}
MessageDAO md = new MySQLMessageDAO();
public int insertThread( ThreadBean threadBean
)
throws
MessageDAOSysException, ObjectNotFoundException
{
md.createThread( receiver, sender,
threadCreationDate,
threadViewCount
);
.
.
return threadID;
}
}
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RE: All The Bean Properties Are Null in the Business Tier!!! (Used BeanUtils to Convert DynaValidatorForm)
Sorry, I mean copyProperties().
You can find the differences defined below:
http://jakarta.apache.org/commons/beanutils/api/org/apache/commons/beanutils
/BeanUtils.html#copyProperties(java.lang.Object, java.lang.Object)
http://jakarta.apache.org/commons/beanutils/api/org/apache/commons/beanutils
/BeanUtils.html#populate(java.lang.Object, java.util.Map)
robert
-Original Message-
From: Caroline Jen [mailto:[EMAIL PROTECTED]
Sent: Wednesday, January 07, 2004 2:13 PM
To: Struts Users Mailing List
Subject: RE: All The Bean Properties Are Null in the Business Tier!!!
(Used BeanUtils to Convert DynaValidatorForm)
What does BeanUtils.populate(); do? I used
BeanUtils.copyProperties();
Does it make any difference?
--- Robert Taylor [EMAIL PROTECTED] wrote:
Have you checked to make sure that the fields you
expect
actually exist in the form before calling
BeanUtils.populate()?
If so, have you checked to see if the data was
copied properly
just after BeanUtils.populate()?
BeanUtils.populate() uses reflection to copy
properties.
Are you usingproper JavaBeans naming convention?
Try and isolate exactly where the data is getting
lost.
I use BeanUtils.populate() all the time with
DynaForms and
have no problems. Usually when I do, I find that my
data member
names don't correspond.
robert
-Original Message-
From: Caroline Jen [mailto:[EMAIL PROTECTED]
Sent: Wednesday, January 07, 2004 1:42 PM
To: [EMAIL PROTECTED]
Subject: All The Bean Properties Are Null in the
Business Tier!!! (Used
BeanUtils to Convert DynaValidatorForm)
Hi, my program compiled OKay. When I ran the
application, somehow, the properties of my
DynaValidatorForm are not passed from the action
class
to the business tier and then to the data access
tier.
Please help me taking a look at what went wrong.
It looks that the validation worked fine:
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
because when I intentionally left several of the
text
fields blank and submitted my JSP form, an applet
got
prompted showing something in those fields are
required.
In my action class (see below), I used BeanUtils
to
copy all the properties of the DynaValidatorForm
to a
bean (ThreadBean):
DynaActionForm postForm = ( DynaActionForm )form;
ThreadBean threadBean = new ThreadBean();
BeanUtils.copyProperties( threadBean, postForm );
I then added a number of properties with
pre-defined
values to the ThreadBean in the Action class:
Timestamp now = DateUtil.getCurrentGMTTimestamp();
threadBean.setThreadCreationDate( now );
threadBean.setThreadViewCount( 0 );
I then called a method in a service class
ThreadHandler and passing threadBean as the
parameter
of that method:
ThreadHandler thandler = new ThreadHandler();
threadID = thandler.insertThread( threadBean );
In the ThreadHandler class (see below), I first
tried
to retrieve the values of those properties from
the
ThreadBean. I FOUND OUT ALL THOSE VALUES ARE
NULL!
class ThreadHandler extends ThreadBean
{
int threadID = getThreadID();
String receiver = getReceiver();
String sender = getSender();
Timestamp threadCreationDate =
getThreadCreationDate();
int threadViewCount = getThreadViewCount();
public ThreadHandler() {}
MessageDAO md = new MySQLMessageDAO();
public int insertThread( ThreadBean threadBean
)
throws
MessageDAOSysException, ObjectNotFoundException
{
md.createThread( receiver, sender,
threadCreationDate,
threadViewCount
);
.
.
return threadID;
}
}
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RE: All The Bean Properties Are Null in the Business Tier!!! (Used BeanUtils to Convert DynaValidatorForm)
I have narrowed down the problem. Something went
wrong in my business tier class (ThreadHandler.java).
All the properties in the JavaBean are populated
properly (I have checked). The way I coded in the
ThreadHandler class failed to retrieve the value of
all the properties in the JavaBean (ThreadBean.java).
All the values turned out to be null or 0. Now, what
is wrong with the code?
class ThreadHandler extends ThreadBean
{
String receiver = getReceiver();
String sender = getSender();
String threadTopic = getPostTopic();
String threadBody = getPostBody();
Timestamp threadCreationDate =
getThreadCreationDate();
int threadViewCount = getThreadViewCount();
int threadReplyCount = getThreadReplyCount();
.
.
}
To answer your question:
1. Have you checked to make sure that the fields you
expect actually exist in the form before calling
BeanUtils.copyProperties()?
Yes, I have printed out the contents of the JSP text
fields in my action class, which is a servlet. For
example: System.out.println( the sender is +
postForm.get( sender ) );
2. If so, have you checked to see if the data was
copied properly just after BeanUtils.copyProperties()?
Yes, I have also printed out the value of the bean
properties. For example: System.out.println( the
sender is + threadBean.getSender() );
3. BeanUtils.copyProperties() uses reflection to copy
properties. Are you using proper JavaBeans naming
convention?
Yes, I used a pair of get and set methods for each
properties in the JavaBean (ThreadBean.java). And in
my action class, I could print out the value of those
properties.
--- Robert Taylor [EMAIL PROTECTED] wrote:
Have you checked to make sure that the fields you
expect
actually exist in the form before calling
BeanUtils.populate()?
If so, have you checked to see if the data was
copied properly
just after BeanUtils.populate()?
BeanUtils.populate() uses reflection to copy
properties.
Are you usingproper JavaBeans naming convention?
Try and isolate exactly where the data is getting
lost.
I use BeanUtils.populate() all the time with
DynaForms and
have no problems. Usually when I do, I find that my
data member
names don't correspond.
robert
-Original Message-
From: Caroline Jen [mailto:[EMAIL PROTECTED]
Sent: Wednesday, January 07, 2004 1:42 PM
To: [EMAIL PROTECTED]
Subject: All The Bean Properties Are Null in the
Business Tier!!! (Used
BeanUtils to Convert DynaValidatorForm)
Hi, my program compiled OKay. When I ran the
application, somehow, the properties of my
DynaValidatorForm are not passed from the action
class
to the business tier and then to the data access
tier.
Please help me taking a look at what went wrong.
It looks that the validation worked fine:
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
because when I intentionally left several of the
text
fields blank and submitted my JSP form, an applet
got
prompted showing something in those fields are
required.
In my action class (see below), I used BeanUtils
to
copy all the properties of the DynaValidatorForm
to a
bean (ThreadBean):
DynaActionForm postForm = ( DynaActionForm )form;
ThreadBean threadBean = new ThreadBean();
BeanUtils.copyProperties( threadBean, postForm );
I then added a number of properties with
pre-defined
values to the ThreadBean in the Action class:
Timestamp now = DateUtil.getCurrentGMTTimestamp();
threadBean.setThreadCreationDate( now );
threadBean.setThreadViewCount( 0 );
I then called a method in a service class
ThreadHandler and passing threadBean as the
parameter
of that method:
ThreadHandler thandler = new ThreadHandler();
threadID = thandler.insertThread( threadBean );
In the ThreadHandler class (see below), I first
tried
to retrieve the values of those properties from
the
ThreadBean. I FOUND OUT ALL THOSE VALUES ARE
NULL!
class ThreadHandler extends ThreadBean
{
int threadID = getThreadID();
String receiver = getReceiver();
String sender = getSender();
Timestamp threadCreationDate =
getThreadCreationDate();
int threadViewCount = getThreadViewCount();
public ThreadHandler() {}
MessageDAO md = new MySQLMessageDAO();
public int insertThread( ThreadBean threadBean
)
throws
MessageDAOSysException, ObjectNotFoundException
{
md.createThread( receiver, sender,
threadCreationDate,
threadViewCount
);
.
.
return threadID;
}
}
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