Need to be able to @Inject Serializable Set into @SessionScoped bean

Need to be able to @Inject Serializable Set into @SessionScoped bean

I've got a producer method that wants to produce a set that is unmodifiable:
// EnumSet.noneof returns an object of type Serializable, and also
// Collections#synchronizedSet javadoc says, "The returned set will be
// serializable if the specified set is serializable."
private final Set<Role> roles =
Collections.synchronizedSet(EnumSet.noneOf(Role.class));
...
@Produces @LoggedIn public Set<Role> getRoles()
{
// Collections#unmodifiableSet javadoc also says, "The returned set
will be
// serializable if the specified set is serializable."
return Collections.unmodifiableSet(this.roles);
}
I want to inject the set into a session scoped bean:
@Inject @LoggedIn Set<Role> roles;
At the injection point a warning is issued, saying that I cannot inject a
set, which is not serializable, into a bean of passivating scope. The
warning makes sense because the Set interfaces does not extend
Serializable. However, in this circumstance it would appear, according to
the javadoc, that roles is in fact serializable. I am not sure of the best
way to handle this situation in order to avoid the warning.
Incidentally, I've noticed that applying
@SuppressWarnings({"NonSerializableFieldInSerializableClass"}) at the
injection point does not suppress the warning. But what I've also noticed
that the following line of code in the same session scoped bean, located
right next to the injection point, does NOT cause a warning message to be
issued:
@Inject @LoggedIn Set<Role> roles; // warning
private Set<Role> roles1; // no warning!
Weird!
I have three questions:
What would be the best approach to take in this circumstance?
Why does @Inject @LoggedIn Set<Role> roles cause a warning whereas private
Set<Role> roles1 does not?
Why does applying
@SuppressWarnings({"NonSerializableFieldInSerializableClass"}) at the
injection point not suppress the warning?