logic:iterate problem: NullPointerException
Hi to all.
I have a problem with a logic:iterate tag. I'm using Struts 1.3.
I have to populate a select with data read from db (by invoking the first
Action). When a select option is selected in the jsp, I have to invoke a
second Action (on the same jsp page) which has to perform some operations
and remember the previous selected option (in the select).
I show you my source code for semplicity.
Here is my ActionForm.
***
CreazioneProfiloUtenteForm.java
***
public class CreazioneProfiloUtenteForm extends ActionForm
{
private String sport;
public ActionErrors validate(ActionMapping mapping,HttpServletRequest
request)
{
return null;
}
public void reset(ActionMapping mapping, HttpServletRequest request)
{
}
public String getSport() {
return sport;
}
public void setSport(String sport) {
this.sport = sport;
}
}
First, the ToCreazioneProfiloUtenteAction action is invoked. This action
reads data from db and insert them in the ArrayList 'listaSport'; at the
end, this ArrayList is setted in the request.
***
ToCreazioneProfiloUtenteAction.java
***
public class ToCreazioneProfiloUtenteAction extends Action
{
public ActionForward execute(ActionMapping mapping, ActionForm
form,HttpServletRequest request, HttpServletResponse response)
{
...
...
ArrayList listaSport = null;
listaSport = new ArrayList();
listaSport.add(new
org.apache.struts.util.LabelValueBean(defaultOptionSelect,));
while(db.getResultSet().next())
listaSport.add(new
org.apache.struts.util.LabelValueBean(db.getResultSet().getString(nomeSport),db.getResultSet().getString(idSport)));
request.setAttribute(listaSport, listaSport);
...
...
}
}
Then creazioneProfiloUtente.jsp is invoked. I have a select 'sport' that
reads the collections in the ArrayList 'listaSport'. Then, I have to store
in hidden fields the values of the 'listaSport' arraylist in order to avoid,
in the second Action, to re-access to db to read the same values. In order
to do so, I use logic:iterate but I have problems with it. I confirm that if
I delete from source code the tag logic:iterate, all works well.
**
creazioneProfiloUtente.jsp
**
...
...
html:select property=sport styleId=sport
o_nchange=javascript:submitForm('creazioneProfiloUtenteForm','caricamentoRuoliAttributiSport.do')
html:optionsCollection name=listaSport /
/html:select
logic:iterate
id=sport name=listaSport
html:hidden
name=sport property=label indexed=true /
html:hidden
name=sport property=value indexed=true /
/logic:iterate
...
...
This is the second Action, which should be invoked when a select option is
selected by user. Unfortunately, this Action is never accessed because I got
a java NullPointerException before.
*
CaricamentoRuoliAttributiSportAction.java
*
public class CaricamentoRuoliAttributiSportAction extends Action
{
public ActionForward execute(ActionMapping mapping, ActionForm
form,HttpServletRequest request, HttpServletResponse response)
{
System.out.println(X);
}
}
*
EXCEPTION
*
GRAVE: Servlet.service() for servlet action threw exception
java.lang.NullPointerException
at
org.apache.commons.beanutils.PropertyUtilsBean.getIndexedProperty(PropertyUtilsBean.java:427)
at
org.apache.commons.beanutils.PropertyUtilsBean.getIndexedProperty(PropertyUtilsBean.java:340)
at
org.apache.commons.beanutils.PropertyUtilsBean.getNestedProperty(PropertyUtilsBean.java:684)
at
org.apache.commons.beanutils.PropertyUtilsBean.getProperty(PropertyUtilsBean.java:715)
at
org.apache.commons.beanutils.BeanUtilsBean.setProperty(BeanUtilsBean.java:884)
at
org.apache.commons.beanutils.BeanUtilsBean.populate(BeanUtilsBean.java:811)
at org.apache.commons.beanutils.BeanUtils.populate(BeanUtils.java:298)
at org.apache.struts.util.RequestUtils.populate(RequestUtils.java:467)
at
org.apache.struts.chain.commands.servlet.PopulateActionForm.populate(PopulateActionForm.java:50)
at
logic:iterate - problem
Hello! I've got a problem to get a value within a logic:iterate construction (foo is an ArrayList Object): logic:iterate name=foo id=object html:textarea ... rows='bean:write name=object property=rows/' / /logic:iterate This does not work. How must it been written to address the method getRows() in the object, which has been defined by id in logic:iterate? Kind regards, Andreas Hartmann Jetzt Handykosten senken mit klarmobil - 14 Ct./Min.! Hier klicken http://produkte.shopping.freenet.de/handy_voip_isdn/klarmobil/index.html?pid=730025 - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: logic:iterate - problem
Try following tag... html:textarea ... rows='%= ((YourObject)pageContext.getAttribute(object)).getRows()%' / On 7/10/07, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: Hello! I've got a problem to get a value within a logic:iterate construction (foo is an ArrayList Object): logic:iterate name=foo id=object html:textarea ... rows='bean:write name=object property=rows/' / /logic:iterate This does not work. How must it been written to address the method getRows() in the object, which has been defined by id in logic:iterate? Kind regards, Andreas Hartmann Jetzt Handykosten senken mit klarmobil - 14 Ct./Min.! Hier klicken http://produkte.shopping.freenet.de/handy_voip_isdn/klarmobil/index.html?pid=730025 - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Yoge, AdventNet, Inc. 925-965-6528 [EMAIL PROTECTED] site24x7.com
Re: logic:iterate - problem
Another way to do it (with a little bit less java) is: logic:iterate name=foo id=object bean:define id=rows name=object property=rows / html:textarea ... rows='%=rows%' / /logic:iterate [EMAIL PROTECTED] wrote: Hello! I've got a problem to get a value within a logic:iterate construction (foo is an ArrayList Object): logic:iterate name=foo id=object html:textarea ... rows='bean:write name=object property=rows/' / /logic:iterate This does not work. How must it been written to address the method getRows() in the object, which has been defined by id in logic:iterate? Kind regards, Andreas Hartmann Jetzt Handykosten senken mit klarmobil - 14 Ct./Min.! Hier klicken http://produkte.shopping.freenet.de/handy_voip_isdn/klarmobil/index.html?pid=730025 - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Chad S. Lauritsen Ecommerce Enterprise Developer The Sherwin-Williams Company 216-566-2166 - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: logic:iterate - problem
Hello Chad, hello Yoge,
thanks for your hints!
meanwhile, I could find a third solution:
logic:iterate name=foo id=object type=my.url.classname
html:textarea ... rows=%= object.getRows() % /
/logic:iterate
Another solution should be to use EL:
html:textarea ... rows=${object.rows}/
But this solution doesn't work for me (the string ${object.rows} appears
unchanged after rows=) , though I'm using tomcat 5.5 and struts 1.2.9..
May be, it should be written as:
%@ taglib uri=/WEB-INF/struts-html-el.tld prefix=html-el %
%@ taglib uri=/WEB-INF/struts-logic-el.tld prefix=logic-el %
logic-el:iterate name=foo id=object type=my.url.classname
html-el:textarea ... rows=${object.rows} /
/logic-el:iterate
(from: http://entwickler-forum.de/showthread.php?t=33417 )
Kind regards,
Andreas Hartmann
Chad S. Lauritsen wrote:
Another way to do it (with a little bit less java) is:
logic:iterate name=foo id=object
bean:define id=rows name=object property=rows /
html:textarea ... rows='%=rows%' /
/logic:iterate
[EMAIL PROTECTED] wrote:
Hello!
I've got a problem to get a value within a logic:iterate construction
(foo is an ArrayList Object):
logic:iterate name=foo id=object
html:textarea ... rows='bean:write name=object property=rows/' /
/logic:iterate
This does not work.
How must it been written to address the method getRows() in the object,
which has been defined by id in logic:iterate?
Kind regards,
Andreas Hartmann
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logic:iterate problem...
Hi all... I get this exception trying to render options with logic iterate tag... javax.servlet.jsp.JspException: Cannot create iterator for this collection My action just get a List form a Srevice layer and store it in session scope under Globales.AreaPersonal.MODULOS_KEY. logic:iterate id=modulo collection='%=Globales.AreaPersonal.MODULOS_KEY%' option value='%=((Contenible)modulo).getId()%' %=((Contenible)modulo).getNombre()+ - + ((Contenible)modulo).getTitulo()% /option /logic:iterate i wish someone help me... thanks! Lucas __ Correo Yahoo! Espacio para todos tus mensajes, antivirus y antispam ¡gratis! ¡Abrí tu cuenta ya! - http://correo.yahoo.com.ar
Re: logic:iterate problem...
I think your List reference is probably null. Also, have you looked at html:options and html:optionsCollection? Erik Lucas Bern wrote: Hi all... I get this exception trying to render options with logic iterate tag... javax.servlet.jsp.JspException: Cannot create iterator for this collection My action just get a List form a Srevice layer and store it in session scope under Globales.AreaPersonal.MODULOS_KEY. logic:iterate id=modulo collection='%=Globales.AreaPersonal.MODULOS_KEY%' option value='%=((Contenible)modulo).getId()%' %=((Contenible)modulo).getNombre()+ - + ((Contenible)modulo).getTitulo()% /option /logic:iterate i wish someone help me... thanks! Lucas __ Correo Yahoo! Espacio para todos tus mensajes, antivirus y antispam ¡gratis! ¡Abrí tu cuenta ya! - http://correo.yahoo.com.ar - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: logic:iterate problem...
I would like to get a null pointer exception or a can not set bean to null when my list is null... I use to solve this kind of problem with html:options and html:optionsCollection but what i have to do in this page is very complex for this tags... thanks for your answer Erik Lucas Erik Weber [EMAIL PROTECTED] wrote: I think your List reference is probably null. Also, have you looked at html:options and html:optionsCollection? Erik Lucas Bern wrote: Hi all... I get this exception trying to render options with logic iterate tag... javax.servlet.jsp.JspException: Cannot create iterator for this collection My action just get a List form a Srevice layer and store it in session scope under Globales.AreaPersonal.MODULOS_KEY. i wish someone help me... thanks! Lucas __ Correo Yahoo! Espacio para todos tus mensajes, antivirus y antispam ¡gratis! ¡Abrí tu cuenta ya! - http://correo.yahoo.com.ar - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - 250MB gratis, Antivirus y Antispam Correo Yahoo!, el mejor correo web del mundo Abrí tu cuenta aquí
Re: logic:iterate problem...
Hmm I didn't even notice that.
However, this is the section of code that throws that Exception (from
1.2.4 src):
/**
* Construct an iterator for the specified collection, and begin
* looping through the body once per element.
*
* @exception JspException if a JSP exception has occurred
*/
public int doStartTag() throws JspException {
// Acquire the collection we are going to iterate over
Object collection = this.collection;
if (collection == null) {
collection = TagUtils.getInstance().lookup(pageContext,
name, property, scope);
}
if (collection == null) {
JspException e = new
JspException(messages.getMessage(iterate.collection));
TagUtils.getInstance().saveException(pageContext, e);
throw e;
}
So I'm not sure.
Erik
Michael Jouravlev wrote:
Looks like you are trying to iterate over string.
How about this:
logic:iterate id=modulo
collection='%=(List)
session.getAttribute(Globales.AreaPersonal.MODULOS_KEY)%'
Michael.
On 4/21/05, Lucas Bern [EMAIL PROTECTED] wrote:
Hi all...
I get this exception trying to render options with logic iterate tag...
javax.servlet.jsp.JspException: Cannot create iterator for this collection
My action just get a List form a Srevice layer and store it in session scope
under Globales.AreaPersonal.MODULOS_KEY.
logic:iterate id=modulo collection='%=Globales.AreaPersonal.MODULOS_KEY%'
option value='%=((Contenible)modulo).getId()%'
%=((Contenible)modulo).getNombre()+ - + ((Contenible)modulo).getTitulo()%
/option
/logic:iterate
i wish someone help me...
thanks!
Lucas
__
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¡Abrí tu cuenta ya! - http://correo.yahoo.com.ar
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Re: logic:iterate problem...
From http://struts.apache.org/userGuide/struts-logic.html#iterate: collection: A runtime expression that evaluates to a collection %=Globales.AreaPersonal.MODULOS_KEY% probably evaluates to a String. What you need is name='%=Globales.AreaPersonal.MODULOS_KEY%' On 4/21/05, Lucas Bern [EMAIL PROTECTED] wrote: My action just get a List form a Srevice layer and store it in session scope under Globales.AreaPersonal.MODULOS_KEY. logic:iterate id=modulo collection='%=Globales.AreaPersonal.MODULOS_KEY%' - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: logic:iterate problem...
Great! it works fine... thanks Jeff and Erik. Lucas Jeff Beal [EMAIL PROTECTED] wrote: From http://struts.apache.org/userGuide/struts-logic.html#iterate: collection: A runtime expression that evaluates to a collection probably evaluates to a String. What you need is name='' On 4/21/05, Lucas Bern wrote: My action just get a List form a Srevice layer and store it in session scope under Globales.AreaPersonal.MODULOS_KEY. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - 250MB gratis, Antivirus y Antispam Correo Yahoo!, el mejor correo web del mundo Abrí tu cuenta aquí
R: Logic:Iterate Problem
Hi,
you can use the JSTL1.1 (or 1.0 as you want) in the following way:
%@ taglib uri=http://java.sun.com/jsp/jstl/core; prefix=c %
table
c:forEach items=${requestScope.pageRecords} var=row
trc:out value=${row.Id}//tr
/c:forEach
/table
you can use pageScope, requestScope, sessionScope or
applicationScope depending on the pageRecords is stored.
-Messaggio originale-
Da: Eddie Yan [mailto:[EMAIL PROTECTED]
Inviato: mercoledì 23 giugno 2004 18.06
A: [EMAIL PROTECTED]
Oggetto: Logic:Iterate Problem
Hi guys,
Say I have a JSP as follows:
table
tr
%
Iterator iter = pageRecords.iterator();
while(iter.hasNext())
{
UserDetail detail = (UserDetail)iter.next();
%
td %= detail.getId() % /td
%
}
%
/tr
/table
pageRecords is a Collection of UserDetail object.
UserDetail is my data transfer object.
I can manage to get the expected result of detail.getId()
How can I represent the above code in logic:iterate tags ?
The following code doesn't work.
table
tr
logic:iterate id=myID collection=pageRecords property=UserDetail
td bean:write name=myID property=id / /td /logic:iterate
/tr /table
I got JSP Exception: Cannot create iterator for this collection
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RE: Logic:Iterate Problem
Assuming you have a scoped Collection named pageRecords:
Struts tags:
logic:iterate id=myID name=pageRecords
td bean:write name=myID property=id / /td
/logic:iterate
JSTL:
c:forEach var=user items=${pageRecords}
c:out value=${user.id}/
/c:forEach
robert
-Original Message-
From: Eddie Yan [mailto:[EMAIL PROTECTED]
Sent: Wednesday, June 23, 2004 12:06 PM
To: [EMAIL PROTECTED]
Subject: Logic:Iterate Problem
Hi guys,
Say I have a JSP as follows:
table
tr
%
Iterator iter = pageRecords.iterator();
while(iter.hasNext())
{
UserDetail detail = (UserDetail)iter.next();
%
td %= detail.getId() % /td
%
}
%
/tr
/table
pageRecords is a Collection of UserDetail object.
UserDetail is my data transfer object.
I can manage to get the expected result of detail.getId()
How can I represent the above code in logic:iterate tags ?
The following code doesn't work.
table
tr
logic:iterate id=myID collection=pageRecords property=UserDetail
td bean:write name=myID property=id / /td
/logic:iterate
/tr
/table
I got JSP Exception: Cannot create iterator for this collection
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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]
R: Logic:Iterate Problem
Hi,
you can use the JSTL1.1 (or 1.0 as you want) in the following way:
%@ taglib uri=http://java.sun.com/jsp/jstl/core; prefix=c %
table
c:forEach items=${requestScope.pageRecords} var=row
trc:out value=${row.Id}//tr
/c:forEach
/table
you can use pageScope, requestScope, sessionScope or
applicationScope depending on the pageRecords is stored.
BR
/Amleto
-Messaggio originale-
Da: Eddie Yan [mailto:[EMAIL PROTECTED]
Inviato: mercoledì 23 giugno 2004 18.06
A: [EMAIL PROTECTED]
Oggetto: Logic:Iterate Problem
Hi guys,
Say I have a JSP as follows:
table
tr
%
Iterator iter = pageRecords.iterator();
while(iter.hasNext())
{
UserDetail detail = (UserDetail)iter.next();
%
td %= detail.getId() % /td
%
}
%
/tr
/table
pageRecords is a Collection of UserDetail object.
UserDetail is my data transfer object.
I can manage to get the expected result of detail.getId()
How can I represent the above code in logic:iterate tags ?
The following code doesn't work.
table
tr
logic:iterate id=myID collection=pageRecords property=UserDetail
td bean:write name=myID property=id / /td /logic:iterate
/tr /table
I got JSP Exception: Cannot create iterator for this collection
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