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https://issues.apache.org/jira/browse/TAP5-1284?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Howard M. Lewis Ship updated TAP5-1284:
---------------------------------------
Assignee: (was: Howard M. Lewis Ship)
> When using @PageActivationContext and override a no-args activate event
> handler of parent page, the handler called too soon
> ---------------------------------------------------------------------------------------------------------------------------
>
> Key: TAP5-1284
> URL: https://issues.apache.org/jira/browse/TAP5-1284
> Project: Tapestry 5
> Issue Type: Bug
> Components: tapestry-core
> Affects Versions: 5.2.0
> Reporter: Alexander Gavrilov
> Priority: Critical
>
> It appears that the overrided onActivate() method is called before the
> @PageActivationContext logic, which means the following can fail:
> public class BasePage {
> private MyEntity entity;
>
> protected void setEntity(MyEntity entity) {
> this.entity = entity;
> }
>
> protected void onActivate() {
> if (entity == null) throw new RuntimeException("Entity not found.");
> }
> }
> public class ConcreteClass {
> @PageActivationContext
> private MyEntity entity;
> protected void onActivate() {
> setEntity(entity);
> super.onActivate();
> }
> }
> Workaround is do not use methods overriding.
> The problem is the consecuence of Howard's approach: "if the child class
> *overrides* a method of the parent, then the overridden method will be
> invoked only by the parent class". When Tapestry performs transformation it
> skips OnEventWorker advice, which invoke event handler method of subclass and
> add it only for parent class. And required for @PageActivationContext chain
> of invocation breaks. My approach is that if some class override some event
> handler method of some class then Tapestry should stop advaicing parent class
> method invocation and should rely on subclass method definition and is the
> subclass implementor responibility to invoke parent class method.
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