0040066: API Change: EntityPersistenceEventObserver declared as an @ApplicationScoped bean

Description

The fix for issue 0040046 declares the EntityPersistenceEventObserver class as an @ApplicationScoped bean. This is done because having no annotation, classes extending this one are @Dependent by default, which means than on every write operation done with DAL (save, update, delete) a new instance of every EntityPersistenceEventObserver listening to any of those operations is created.

This is an API change because by default now there only will be one instance of every class extending EntityPersistenceEventObserver (unless the scope would be overridden in the subclass).

Besides, after this API change, event handlers should be proxyable objects for WELD by default. Proxyable classes are those classes which are not final and does not contain any final methods.

For this reason, if an @ApplicationScoped event handler is defined as final or with a final method, the following exception will be thrown on server startup: "org.jboss.weld.exceptions.UnproxyableResolutionException: WELD-001437 Normal scoped bean class is not proxyable because the type is final or it contains a final method"

Note that it is still possible to define event handlers as Dependent by explicitly using the @Dependent annotation. In that case it is not required to define the event handler as a proxyable class.

Steps To Reproduce

N/A

Tags

Approved

Attached Files

Relationships [ Relation Graph ] [ Dependency Graph ]

related to

defect

0040046

closed

caristu

unnecessary objects are created every time any DAL object is created/updated/deleted

Notes
(0109414) caristu (developer) 2019-02-01 10:12 edited on: 2019-02-01 10:12	Functional/Behavior change. No additional changes in the API definition are required.

Issue History
Date Modified	Username	Field	Change
2019-01-30 12:57	caristu	New Issue
2019-01-30 12:57	caristu	Assigned To	=> caristu
2019-01-30 12:57	caristu	Modules	=> Core
2019-01-30 12:57	caristu	Triggers an Emergency Pack	=> No
2019-01-30 12:57	caristu	Issue generated from	0040046
2019-01-30 12:57	caristu	Relationship added	related to 0040046
2019-01-30 14:04	alostale	Tag Attached: Approved
2019-02-01 09:57	caristu	Description Updated	View Revisions
2019-02-01 09:58	caristu	Description Updated	View Revisions
2019-02-01 10:01	caristu	Description Updated	View Revisions
2019-02-01 10:09	caristu	Status	new => scheduled
2019-02-01 10:12	caristu	Review Assigned To	=> caristu
2019-02-01 10:12	caristu	Note Added: 0109414
2019-02-01 10:12	caristu	Status	scheduled => closed
2019-02-01 10:12	caristu	Resolution	open => no change required
2019-02-01 10:12	caristu	Note Edited: 0109414	View Revisions