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Posted to users@wicket.apache.org by HHB <hu...@yahoo.ca> on 2009/04/29 12:38:45 UTC
Why I'm getting NPE?
Hey,
I'm trying to employ DataTable in our application.
*************************
public class SortableContactDataProvider
extends SortableDataProvider {
@SpringBean
private Service service;
private Group group;
public SortableContactDataProvider(Group group) {
if (group == null)
throw new IllegalStateException("Group is null");
InjectorHolder.getInjector().inject(this);
setSort("gsm", true);
this.group = group;
}
public Iterator iterator(int first, int max) {
return service.list(group, first, max,
getSort().getProperty(),
getSort().isAscending()).iterator();
}
public int size() {
return service.listContactsSize(group);
}
public IModel model(Object object) {
Contact contact = (Contact) object;
return new DomainEntityModel<Contact>
(Contact.class, contact.getId());
}
public void setGroup(Group group) {
if (group == null)
throw new IllegalStateException("Group is null");
this.group = group;
}
}
*************************
And I use it this way (inside the panel constructor):
*************************
Group group = new Group();group.setId(1L);
SortableContactDataProvider scdp = new
SortableContactDataProvider(group);
scdp.setGroup(group);
final List<IColumn> columns = new ArrayList<IColumn>();
columns.add(new PropertyColumn(new Model("GSM"), "gsm", "gsm"));
AjaxFallbackDefaultDataTable contacts = new
AjaxFallbackDefaultDataTable("table", columns, scdp, 10);
final WebMarkupContainer wmc = new WebMarkupContainer("contactsTable");
wmc.setOutputMarkupId(true);
wmc.add(contacts);
add(wmc);
*************************
When running the application, I got NullPointerException
from the method size() of the provider, the group object is null.
Why the object is null?
and if it is null, why IllegalStateException is not being thrown?
I'm using Wicket 1.3.5
Thanks for help.
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Re: Why I'm getting NPE?
Posted by nino martinez wael <ni...@gmail.com>.
Short answer, group is set but the list are null?
2009/4/29 nino martinez wael <ni...@gmail.com>:
> Hmm I have something similar, though not getting npe (from 1.3 project) :
>
>
>
> /**
> *
> *
> */
> public class SortableSearchDataProvider extends SortableDataProvider {
>
> private SearchParameters searchParameters;
> /**
> * constructor
> */
> public SortableSearchDataProvider(SearchParameters searchParameters) {
> this.searchParameters=searchParameters;
> // set default sort
> setSort("alias", true);
> InjectorHolder.getInjector().inject(this);
> }
>
> @SpringBean
> private IDBDao dbDao;
>
> protected IDBDao getDao() {
> return dbDao;
> }
>
> /**
> * @see org.apache.wicket.markup.repeater.data.IDataProvider#iterator(int,
> * int)
> */
> public Iterator iterator(int first, int count) {
> SortParam sp = getSort();
> return getDao().searchForSchemes(first, count, sp.getProperty(),
> sp.isAscending(),searchParameters)
> .iterator();
> }
>
> /**
> * @see org.apache.wicket.markup.repeater.data.IDataProvider#size()
> */
> public int size() {
> return getDao().searchForSchemesCount(searchParameters);
> }
>
> /**
> * @see org.apache.wicket.markup.repeater.data.IDataProvider#model(java.lang.Object)
> */
> public IModel model(Object object) {
> return new BaseEntityDetachableModel((Person) object);
> }
>
> }
>
>
> 2009/4/29 HHB <hu...@yahoo.ca>:
>>
>> Actually, thats what I'm doing (you can check my code).
>> The NPE is regarding the Group object instance, not Spring bean.
>>
>>
>> Willis Blackburn wrote:
>>>
>>> Hi,
>>>
>>> The @SpringBean annotation is only resolved by Component and its
>>> subclasses. (Actually it's resolved by SpringComponentInjector--but
>>> that only works with components.)
>>>
>>> You can call InjectorHolder.getInjector().inject(whatever) to resolve
>>> @SpringBean annotations in the whatever object.
>>>
>>> W
>>>
>>>
>>>
>>> On Apr 29, 2009, at 6:38 AM, HHB wrote:
>>>
>>>> Hey,
>>>> I'm trying to employ DataTable in our application.
>>>> *************************
>>>> public class SortableContactDataProvider
>>>> extends SortableDataProvider {
>>>>
>>>> @SpringBean
>>>> private Service service;
>>>>
>>>> private Group group;
>>>>
>>>> public SortableContactDataProvider(Group group) {
>>>> if (group == null)
>>>> throw new IllegalStateException("Group is null");
>>>> InjectorHolder.getInjector().inject(this);
>>>> setSort("gsm", true);
>>>> this.group = group;
>>>> }
>>>>
>>>> public Iterator iterator(int first, int max) {
>>>> return service.list(group, first, max,
>>>> getSort().getProperty(),
>>>> getSort().isAscending()).iterator();
>>>> }
>>>>
>>>> public int size() {
>>>> return service.listContactsSize(group);
>>>> }
>>>>
>>>> public IModel model(Object object) {
>>>> Contact contact = (Contact) object;
>>>> return new DomainEntityModel<Contact>
>>>> (Contact.class, contact.getId());
>>>> }
>>>>
>>>> public void setGroup(Group group) {
>>>> if (group == null)
>>>> throw new IllegalStateException("Group is null");
>>>> this.group = group;
>>>> }
>>>>
>>>> }
>>>> *************************
>>>> And I use it this way (inside the panel constructor):
>>>> *************************
>>>> Group group = new Group();group.setId(1L);
>>>> SortableContactDataProvider scdp = new
>>>> SortableContactDataProvider(group);
>>>> scdp.setGroup(group);
>>>> final List<IColumn> columns = new ArrayList<IColumn>();
>>>> columns.add(new PropertyColumn(new Model("GSM"), "gsm", "gsm"));
>>>> AjaxFallbackDefaultDataTable contacts = new
>>>> AjaxFallbackDefaultDataTable("table", columns, scdp, 10);
>>>> final WebMarkupContainer wmc = new
>>>> WebMarkupContainer("contactsTable");
>>>> wmc.setOutputMarkupId(true);
>>>> wmc.add(contacts);
>>>> add(wmc);
>>>> *************************
>>>> When running the application, I got NullPointerException
>>>> from the method size() of the provider, the group object is null.
>>>> Why the object is null?
>>>> and if it is null, why IllegalStateException is not being thrown?
>>>> I'm using Wicket 1.3.5
>>>> Thanks for help.
>>>>
>>>>
>>>> ---------------------------------------------------------------------
>>>> To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
>>>> For additional commands, e-mail: users-help@wicket.apache.org
>>>>
>>>
>>>
>>> ---------------------------------------------------------------------
>>> To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
>>> For additional commands, e-mail: users-help@wicket.apache.org
>>>
>>>
>>>
>>
>> --
>> View this message in context: http://www.nabble.com/Why-I%27m-getting-NPE--tp23294732p23295098.html
>> Sent from the Wicket - User mailing list archive at Nabble.com.
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
>> For additional commands, e-mail: users-help@wicket.apache.org
>>
>>
>
---------------------------------------------------------------------
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Re: Why I'm getting NPE?
Posted by nino martinez wael <ni...@gmail.com>.
Hmm I have something similar, though not getting npe (from 1.3 project) :
/**
*
*
*/
public class SortableSearchDataProvider extends SortableDataProvider {
private SearchParameters searchParameters;
/**
* constructor
*/
public SortableSearchDataProvider(SearchParameters searchParameters) {
this.searchParameters=searchParameters;
// set default sort
setSort("alias", true);
InjectorHolder.getInjector().inject(this);
}
@SpringBean
private IDBDao dbDao;
protected IDBDao getDao() {
return dbDao;
}
/**
* @see org.apache.wicket.markup.repeater.data.IDataProvider#iterator(int,
* int)
*/
public Iterator iterator(int first, int count) {
SortParam sp = getSort();
return getDao().searchForSchemes(first, count, sp.getProperty(),
sp.isAscending(),searchParameters)
.iterator();
}
/**
* @see org.apache.wicket.markup.repeater.data.IDataProvider#size()
*/
public int size() {
return getDao().searchForSchemesCount(searchParameters);
}
/**
* @see org.apache.wicket.markup.repeater.data.IDataProvider#model(java.lang.Object)
*/
public IModel model(Object object) {
return new BaseEntityDetachableModel((Person) object);
}
}
2009/4/29 HHB <hu...@yahoo.ca>:
>
> Actually, thats what I'm doing (you can check my code).
> The NPE is regarding the Group object instance, not Spring bean.
>
>
> Willis Blackburn wrote:
>>
>> Hi,
>>
>> The @SpringBean annotation is only resolved by Component and its
>> subclasses. (Actually it's resolved by SpringComponentInjector--but
>> that only works with components.)
>>
>> You can call InjectorHolder.getInjector().inject(whatever) to resolve
>> @SpringBean annotations in the whatever object.
>>
>> W
>>
>>
>>
>> On Apr 29, 2009, at 6:38 AM, HHB wrote:
>>
>>> Hey,
>>> I'm trying to employ DataTable in our application.
>>> *************************
>>> public class SortableContactDataProvider
>>> extends SortableDataProvider {
>>>
>>> @SpringBean
>>> private Service service;
>>>
>>> private Group group;
>>>
>>> public SortableContactDataProvider(Group group) {
>>> if (group == null)
>>> throw new IllegalStateException("Group is null");
>>> InjectorHolder.getInjector().inject(this);
>>> setSort("gsm", true);
>>> this.group = group;
>>> }
>>>
>>> public Iterator iterator(int first, int max) {
>>> return service.list(group, first, max,
>>> getSort().getProperty(),
>>> getSort().isAscending()).iterator();
>>> }
>>>
>>> public int size() {
>>> return service.listContactsSize(group);
>>> }
>>>
>>> public IModel model(Object object) {
>>> Contact contact = (Contact) object;
>>> return new DomainEntityModel<Contact>
>>> (Contact.class, contact.getId());
>>> }
>>>
>>> public void setGroup(Group group) {
>>> if (group == null)
>>> throw new IllegalStateException("Group is null");
>>> this.group = group;
>>> }
>>>
>>> }
>>> *************************
>>> And I use it this way (inside the panel constructor):
>>> *************************
>>> Group group = new Group();group.setId(1L);
>>> SortableContactDataProvider scdp = new
>>> SortableContactDataProvider(group);
>>> scdp.setGroup(group);
>>> final List<IColumn> columns = new ArrayList<IColumn>();
>>> columns.add(new PropertyColumn(new Model("GSM"), "gsm", "gsm"));
>>> AjaxFallbackDefaultDataTable contacts = new
>>> AjaxFallbackDefaultDataTable("table", columns, scdp, 10);
>>> final WebMarkupContainer wmc = new
>>> WebMarkupContainer("contactsTable");
>>> wmc.setOutputMarkupId(true);
>>> wmc.add(contacts);
>>> add(wmc);
>>> *************************
>>> When running the application, I got NullPointerException
>>> from the method size() of the provider, the group object is null.
>>> Why the object is null?
>>> and if it is null, why IllegalStateException is not being thrown?
>>> I'm using Wicket 1.3.5
>>> Thanks for help.
>>>
>>>
>>> ---------------------------------------------------------------------
>>> To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
>>> For additional commands, e-mail: users-help@wicket.apache.org
>>>
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
>> For additional commands, e-mail: users-help@wicket.apache.org
>>
>>
>>
>
> --
> View this message in context: http://www.nabble.com/Why-I%27m-getting-NPE--tp23294732p23295098.html
> Sent from the Wicket - User mailing list archive at Nabble.com.
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
> For additional commands, e-mail: users-help@wicket.apache.org
>
>
---------------------------------------------------------------------
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For additional commands, e-mail: users-help@wicket.apache.org
Re: Why I'm getting NPE?
Posted by HHB <hu...@yahoo.ca>.
Actually, thats what I'm doing (you can check my code).
The NPE is regarding the Group object instance, not Spring bean.
Willis Blackburn wrote:
>
> Hi,
>
> The @SpringBean annotation is only resolved by Component and its
> subclasses. (Actually it's resolved by SpringComponentInjector--but
> that only works with components.)
>
> You can call InjectorHolder.getInjector().inject(whatever) to resolve
> @SpringBean annotations in the whatever object.
>
> W
>
>
>
> On Apr 29, 2009, at 6:38 AM, HHB wrote:
>
>> Hey,
>> I'm trying to employ DataTable in our application.
>> *************************
>> public class SortableContactDataProvider
>> extends SortableDataProvider {
>>
>> @SpringBean
>> private Service service;
>>
>> private Group group;
>>
>> public SortableContactDataProvider(Group group) {
>> if (group == null)
>> throw new IllegalStateException("Group is null");
>> InjectorHolder.getInjector().inject(this);
>> setSort("gsm", true);
>> this.group = group;
>> }
>>
>> public Iterator iterator(int first, int max) {
>> return service.list(group, first, max,
>> getSort().getProperty(),
>> getSort().isAscending()).iterator();
>> }
>>
>> public int size() {
>> return service.listContactsSize(group);
>> }
>>
>> public IModel model(Object object) {
>> Contact contact = (Contact) object;
>> return new DomainEntityModel<Contact>
>> (Contact.class, contact.getId());
>> }
>>
>> public void setGroup(Group group) {
>> if (group == null)
>> throw new IllegalStateException("Group is null");
>> this.group = group;
>> }
>>
>> }
>> *************************
>> And I use it this way (inside the panel constructor):
>> *************************
>> Group group = new Group();group.setId(1L);
>> SortableContactDataProvider scdp = new
>> SortableContactDataProvider(group);
>> scdp.setGroup(group);
>> final List<IColumn> columns = new ArrayList<IColumn>();
>> columns.add(new PropertyColumn(new Model("GSM"), "gsm", "gsm"));
>> AjaxFallbackDefaultDataTable contacts = new
>> AjaxFallbackDefaultDataTable("table", columns, scdp, 10);
>> final WebMarkupContainer wmc = new
>> WebMarkupContainer("contactsTable");
>> wmc.setOutputMarkupId(true);
>> wmc.add(contacts);
>> add(wmc);
>> *************************
>> When running the application, I got NullPointerException
>> from the method size() of the provider, the group object is null.
>> Why the object is null?
>> and if it is null, why IllegalStateException is not being thrown?
>> I'm using Wicket 1.3.5
>> Thanks for help.
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
>> For additional commands, e-mail: users-help@wicket.apache.org
>>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
> For additional commands, e-mail: users-help@wicket.apache.org
>
>
>
--
View this message in context: http://www.nabble.com/Why-I%27m-getting-NPE--tp23294732p23295098.html
Sent from the Wicket - User mailing list archive at Nabble.com.
---------------------------------------------------------------------
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Re: Why I'm getting NPE?
Posted by Willis Blackburn <wb...@panix.com>.
Hi,
The @SpringBean annotation is only resolved by Component and its
subclasses. (Actually it's resolved by SpringComponentInjector--but
that only works with components.)
You can call InjectorHolder.getInjector().inject(whatever) to resolve
@SpringBean annotations in the whatever object.
W
On Apr 29, 2009, at 6:38 AM, HHB wrote:
> Hey,
> I'm trying to employ DataTable in our application.
> *************************
> public class SortableContactDataProvider
> extends SortableDataProvider {
>
> @SpringBean
> private Service service;
>
> private Group group;
>
> public SortableContactDataProvider(Group group) {
> if (group == null)
> throw new IllegalStateException("Group is null");
> InjectorHolder.getInjector().inject(this);
> setSort("gsm", true);
> this.group = group;
> }
>
> public Iterator iterator(int first, int max) {
> return service.list(group, first, max,
> getSort().getProperty(),
> getSort().isAscending()).iterator();
> }
>
> public int size() {
> return service.listContactsSize(group);
> }
>
> public IModel model(Object object) {
> Contact contact = (Contact) object;
> return new DomainEntityModel<Contact>
> (Contact.class, contact.getId());
> }
>
> public void setGroup(Group group) {
> if (group == null)
> throw new IllegalStateException("Group is null");
> this.group = group;
> }
>
> }
> *************************
> And I use it this way (inside the panel constructor):
> *************************
> Group group = new Group();group.setId(1L);
> SortableContactDataProvider scdp = new
> SortableContactDataProvider(group);
> scdp.setGroup(group);
> final List<IColumn> columns = new ArrayList<IColumn>();
> columns.add(new PropertyColumn(new Model("GSM"), "gsm", "gsm"));
> AjaxFallbackDefaultDataTable contacts = new
> AjaxFallbackDefaultDataTable("table", columns, scdp, 10);
> final WebMarkupContainer wmc = new
> WebMarkupContainer("contactsTable");
> wmc.setOutputMarkupId(true);
> wmc.add(contacts);
> add(wmc);
> *************************
> When running the application, I got NullPointerException
> from the method size() of the provider, the group object is null.
> Why the object is null?
> and if it is null, why IllegalStateException is not being thrown?
> I'm using Wicket 1.3.5
> Thanks for help.
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
> For additional commands, e-mail: users-help@wicket.apache.org
>
---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
For additional commands, e-mail: users-help@wicket.apache.org
Re: Why I'm getting NPE?
Posted by Johan Compagner <jc...@gmail.com>.
What is the stacktrace when group is null?
On 29/04/2009, HHB <hu...@yahoo.ca> wrote:
> Hey,
> I'm trying to employ DataTable in our application.
> *************************
> public class SortableContactDataProvider
> extends SortableDataProvider {
>
> @SpringBean
> private Service service;
>
> private Group group;
>
> public SortableContactDataProvider(Group group) {
> if (group == null)
> throw new IllegalStateException("Group is null");
> InjectorHolder.getInjector().inject(this);
> setSort("gsm", true);
> this.group = group;
> }
>
> public Iterator iterator(int first, int max) {
> return service.list(group, first, max,
> getSort().getProperty(),
> getSort().isAscending()).iterator();
> }
>
> public int size() {
> return service.listContactsSize(group);
> }
>
> public IModel model(Object object) {
> Contact contact = (Contact) object;
> return new DomainEntityModel<Contact>
> (Contact.class, contact.getId());
> }
>
> public void setGroup(Group group) {
> if (group == null)
> throw new IllegalStateException("Group is null");
> this.group = group;
> }
>
> }
> *************************
> And I use it this way (inside the panel constructor):
> *************************
> Group group = new Group();group.setId(1L);
> SortableContactDataProvider scdp = new
> SortableContactDataProvider(group);
> scdp.setGroup(group);
> final List<IColumn> columns = new ArrayList<IColumn>();
> columns.add(new PropertyColumn(new Model("GSM"), "gsm", "gsm"));
> AjaxFallbackDefaultDataTable contacts = new
> AjaxFallbackDefaultDataTable("table", columns, scdp, 10);
> final WebMarkupContainer wmc = new WebMarkupContainer("contactsTable");
> wmc.setOutputMarkupId(true);
> wmc.add(contacts);
> add(wmc);
> *************************
> When running the application, I got NullPointerException
> from the method size() of the provider, the group object is null.
> Why the object is null?
> and if it is null, why IllegalStateException is not being thrown?
> I'm using Wicket 1.3.5
> Thanks for help.
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
> For additional commands, e-mail: users-help@wicket.apache.org
>
>
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