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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Chuck Hill Senior Consultant / VP Development
Practical WebObjects - for developers who want to increase their
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