Jozef Hartinger created WELD-1076:
-------------------------------------
Summary: Deal with non-serializable dependent instances of a
passivation capable bean
Key: WELD-1076
URL: https://issues.jboss.org/browse/WELD-1076
Project: Weld
Issue Type: Task
Affects Versions: 2.0.0.Alpha1
Reporter: Jozef Hartinger
Assignee: Jozef Hartinger
Fix For: 2.0.0.Alpha2
Since https://github.com/jboss/cdi/pull/47 it is legal for a normal-scoped
component to have a non-passivation capable dependency, e.g:
{CODE:JAVA}
@SessionScoped
public class Foo implements Serializable {
@Inject
public Foo(Bar bar) {
}
}
public class Bar {
}
{CODE}
Although the Bar instance reference is not retained by the Foo instance, the
Bar instance is still technically a dependent instance of Foo and therefore the
container needs to keep a reference to it in order to eventually destroy it
properly.
We may make use of the following part of the spec:
{QUOTE}
Finally, the container is permitted to destroy any @Dependent scoped contextual
instance at any time if the instance is no
longer referenced by the application (excluding weak, soft and phantom
references)."
{QUOTE}
and destroy every non-serializable dependent bean instance of a normal-scoped
bean when the creational context for the normal-scoped bean instance is
serialized.
This should be safe for these cases:
* Foo no longer holds a reference to Bar, therefore we can destroy Bar
* Foo holds a reference to Bar - does not matter if we destroy Bar prematurely
since serialization of Bar is going to fail anyway
* Foo holds a reference to Bar in a transient field and is therefore either
going to "forget" the reference (therefore we can destroy it) or is able to
recreate the Bar instance itself on deserialization
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