[cdi-dev] Dealing with non-passivation-capable dependencies of a normal-scoped bean

[Jozef Hartinger]

Hello,

with https://github.com/jboss/cdi/pull/47 in place the validation rules 
for dependencies of normal-scoped components have been weakened. The 
idea is that CDI should not enforce dependencies to be passivation 
capable if these dependencies are only used temporarily in the 
initialization of a normal-scoped bean. Consider the following example:

@SessionScoped
public class Foo implements Serializable {

    @Inject
    public Foo(Bar bar) {
    }
}

public class Bar {
}

CDI now considers this scenario to be valid. However, the Bar instance 
is still technically a dependent instance of Foo and the container still 
needs to retain a reference to it in order to destroy it properly. The 
problem arises when the session is serialized. Although the Foo instance 
does not reference the Bar instance and can therefore be serialized, the 
CreationalContext of Foo still holds the dependent instance and is 
therefore not serializable.

I came up with an idea of how to implement it in Weld at 
https://issues.jboss.org/browse/WELD-1076 . However, I do not consider 
this approach to be very clean and intuitive for specification 
implementors. Therefore, I want to make sure that the specification is 
really intended to be implemented this way and that this is not an 
oversight in the specification.

JH