Re: NullPointerException
Re: NullPointerException
- Subject: Re: NullPointerException
- From: Steve Quirk <email@hidden>
- Date: Wed, 01 Oct 2008 17:23:49 -0400 (EDT)
On Wed, 1 Oct 2008, Chuck Hill wrote:
Nothing about that looks familiar to me. You appear to be using Wonder which
should fix any bug.
__________________!!!
Oh come on now. A little humility, please. :-)
Steve
Anyone have an idea on this?
Chuck
On Oct 1, 2008, at 7:40 AM, Awbrey Hughlett wrote:
I am using Wonder 5.3 and I have found a few things saying there was a bug
with WOForm in that version. Is this the case here?
<webobject name="Form">
<webobject name="SpecificType"></webobject><br />
<webobject name="SaveChanges"></webobject>
</webobject>
Form : WOForm {
}
SpecificType : WOTextField {
value = specific.specificType;
}
SaveChanges : WOSubmitButton {
action = saveChanges;
value = "Save";
}
Awbrey
On Oct 1, 2008, at 1:01 AM, Chuck Hill wrote:
Please keep messages on the list.
^ now I understand what you are saying :( oops sorry
That error seems very odd. What is in the HTML and WOD?
Chuck
On Sep 30, 2008, at 9:46 PM, Awbrey Hughlett wrote:
File
Line#
Method
Package
WOForm.java
58
_enterFormInContext
com.webobjects.appserver._private
WOForm.java
69
takeValuesFromRequest
com.webobjects.appserver._private
WOComponent.java
914
takeValuesFromRequest
com.webobjects.appserver
WOSession.java
1139
takeValuesFromRequest
com.webobjects.appserver
ERXSession.java
525
takeValuesFromRequest
er.extensions.appserver
WOApplication.java
1350
takeValuesFromRequest
com.webobjects.appserver
WOComponentRequestHandler.java
189
_dispatchWithPreparedPage
com.webobjects.appserver._private
WOComponentRequestHandler.java
287
_dispatchWithPreparedSession
com.webobjects.appserver._private
WOComponentRequestHandler.java
322
_dispatchWithPreparedApplication
com.webobjects.appserver._private
WOComponentRequestHandler.java
358
_handleRequest
com.webobjects.appserver._private
WOComponentRequestHandler.java
432
handleRequest
com.webobjects.appserver._private
WOApplication.java
1306
dispatchRequest
com.webobjects.appserver
WOWorkerThread.java
173
runOnce
com.webobjects.appserver._private
WOWorkerThread.java
254
run
com.webobjects.appserver._private
Thread.java
613
run
java.lang
NA : Non applicable, JIT activated
On Sep 30, 2008, at 11:22 PM, Chuck Hill wrote:
On Sep 30, 2008, at 8:07 PM, Awbrey Hughlett wrote:
I have an entity named "Specific" and an attribute named
"specificType". I have a WOTextField bound to specific.specificType and
a WOSubmitButton bound to saveChanges() all wrapped in a WOForm. When I
run the component and click to save changes to the database, I get a
NullPointerException. Have I instantiated the Specific entity and
inserted it into an editing context correctly? Or do I have other
problems?
You have other problems, some of which you probably don't know about.
public class SpecificEntry extends WOComponent {
private Specific specific;
private EOEditingContext ec = new EOEditingContext();
Noooooooooo. :-) You are using an unlocked editing context. Doom
awaits you. You have three choices here:
1. Start using Wonder and ERXEC
2. Use session().defaultEditingContext() - though this has issues of its
own
3. Use MultiECLockManager and add the infrastructure to your apps to
handle EC management.
public SpecificEntry(WOContext context) {
super(context);
}
public Specific specific() {
if (specific == null) {
editingContext().revert();
specific =
(Specific)EOUtilities.createAndInsertInstance(editingContext(),
"Specific");
}
return specific;
}
public WOComponent saveChanges() {
editingContext().saveChanges();
setSpecific(null);
return context().page();
Post the stack track for for NPE. Guessing is too hard.
Chuck
}
public EOEditingContext editingContext() {
return ec;
}
public void setSpecific(Specific newSpecific) {
specific = newSpecific;
}
}
Thanks,
Awbrey
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