Re: Tutorial
Re: Tutorial
- Subject: Re: Tutorial
- From: David LeBer <email@hidden>
- Date: Wed, 12 Mar 2008 19:33:12 -0400
On 12-Mar-08, at 6:02 PM, Gustavo Pizano wrote:
aha ok...
you will kill me but this time i swear i google it.
Im having this
<WorkerThread0>
<com.webobjects.appserver._private.WOComponentRequestHandler>:
Exception occurred while handling request:
java.lang.NullPointerException
[2008-3-12 16:58:45 COT] <WorkerThread0>
java.lang.NullPointerException
at com.nhlpm.pages.AddEdit.saveChanges(AddEdit.java:47)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun
.reflect
.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun
.reflect
.DelegatingMethodAccessorImpl
.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.webobjects.foundation.NSKeyValueCoding$ValueAccessor
$1.methodValue(NSKeyValueCoding.java:636)
at com.webobjects.foundation.NSKeyValueCoding
$_MethodBinding.valueInObject(NSKeyValueCoding.java:1134)
at com.webobjects.foundation.NSKeyValueCoding
$DefaultImplementation.valueForKey(NSKeyValueCoding.java:1293)
at
com.webobjects.appserver.WOComponent.valueForKey(WOComponent.java:
1686)
at com.webobjects.foundation.NSKeyValueCoding
$Utility.valueForKey(NSKeyValueCoding.java:447)
at com.webobjects.foundation.NSKeyValueCodingAdditions
$
DefaultImplementation.valueForKeyPath(NSKeyValueCodingAdditions.java:
212)
at
com
.webobjects.appserver.WOComponent.valueForKeyPath(WOComponent.java:
1754)
at
com
.webobjects
.appserver
._private
.WOKeyValueAssociation.valueInComponent(WOKeyValueAssociation.java:50)
at
com
.webobjects
.appserver._private.WOSubmitButton.invokeAction(WOSubmitButton.java:
81)
at
com
.webobjects
.appserver
._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105)
at
com
.webobjects
.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:
115)
at
com.webobjects.appserver._private.WOForm.invokeAction(WOForm.java:141)
at
com
.webobjects
.appserver
._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105)
at
com
.webobjects
.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:
115)
at
com.webobjects.appserver.WOComponent.invokeAction(WOComponent.java:
1078)
at
com
.webobjects
.appserver
._private
.WOComponentReference.invokeAction(WOComponentReference.java:127)
at
com
.webobjects
.appserver
._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105)
at
com
.webobjects
.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:
115)
at
com.webobjects.appserver.WOComponent.invokeAction(WOComponent.java:
1078)
at com.webobjects.appserver.WOSession.invokeAction(WOSession.java:
1357)
at
com
.webobjects.appserver.WOApplication.invokeAction(WOApplication.java:
1736)
at
com
.webobjects
.appserver
._private
.WOComponentRequestHandler
._dispatchWithPreparedPage(WOComponentRequestHandler.java:206)
at
com
.webobjects
.appserver
._private
.WOComponentRequestHandler
._dispatchWithPreparedSession(WOComponentRequestHandler.java:298)
at
com
.webobjects
.appserver
._private
.WOComponentRequestHandler
._dispatchWithPreparedApplication(WOComponentRequestHandler.java:332)
at
com
.webobjects
.appserver
._private
.WOComponentRequestHandler
._handleRequest(WOComponentRequestHandler.java:369)
at
com
.webobjects
.appserver
._private
.WOComponentRequestHandler
.handleRequest(WOComponentRequestHandler.java:442)
at
com
.webobjects
.appserver.WOApplication.dispatchRequest(WOApplication.java:1678)
at
com
.webobjects
.appserver._private.WOWorkerThread.runOnce(WOWorkerThread.java:144)
at
com
.webobjects
.appserver._private.WOWorkerThread.run(WOWorkerThread.java:226)
at java.lang.Thread.run(Thread.java:613)
when I pusch the save changes....
it pointein to this line of code
displayBoard().setBigImage(uploadedImageData());
Well. Something there is null that shouldn't be.
Try adding this before that line:
NSLog.out.appendln("Display Board: " + displayBoard());
NSLog.out.appendln("Image Data: " + uploadedImageData());
And then work back from there.
in the AddEddit.java in the saveChanges() method.
I am following the tutorial...
Gus
On Mar 12, 2008, at 4:57 PM, David LeBer wrote:
On 12-Mar-08, at 5:40 PM, Gustavo Pizano wrote:
Ok i dunno if I understand good, but as for teh 7 tips you post I
think I following them, as for the line... well the veogen
generated this
public DisplayBoard localInstanceIn(EOEditingContext
editingContext) {
DisplayBoard localInstance =
(DisplayBoard)EOUtilities.localInstanceOfObject(editingContext,
this);
if (localInstance == null) {
throw new IllegalStateException("You attempted to
localInstance " + this + ", which has not yet committed.");
}
return localInstance;
}
and I guess if I put the new line you suggest I must implement
the newDisplayBoard (EOEditingContext) and formt here call the
localInstanceIn()method which resieds int he _DisplayBoard class,
which it looks for me like a singleton pattern.??
My mistake, in the stock Veogen templates only generate a factory
method that takes all of the required attributes:
public static DisplayBoard createDisplayBoard(EOEditingContext
editingContext, ...required attributes... ) {
...
}
Just follow the tutorial.
The EOF Commandments are for reference only at this point, just be
aware they exist. Both the Veogen templates and Janine's tutorial
do the right thing.
;david
--
David LeBer
Codeferous Software
'co-def-er-ous' adj. Literally 'code-bearing'
site: http://codeferous.com
blog: http://davidleber.net
profile: http://www.linkedin.com/in/davidleber
--
Toronto Area Cocoa / WebObjects developers group:
http://tacow.org
;david
--
David LeBer
Codeferous Software
'co-def-er-ous' adj. Literally 'code-bearing'
site: http://codeferous.com
blog: http://davidleber.net
profile: http://www.linkedin.com/in/davidleber
--
Toronto Area Cocoa / WebObjects developers group:
http://tacow.org
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