NEW ISSUE: Guidelines for dealing with cyclic references refers to animpossible situation

[C Vamsi <vamsic007@in.ibm.com>]

TARGET: Java C&I Spec -- sca-javaci-1.1-spec-wd04_proposal2.doc

DESCRIPTION:
Section 5: Implementation Instance Creation
Lines 272-276:
Cyclic references between components MUST be handled by the SCA runtime in
one of two ways:
•     If any reference in the cycle is optional, then the container can
inject a null value during construction, followed by injection of a
reference to the target before invoking any service.
•     The container can inject a proxy to the target service; invocation of
methods on the proxy can result in a ServiceUnavailableException

The first of the two ways in the above text talks about the situation where
a reference which is a constructor parameter bing optional.  This should
not arise since from CAA spec, "For a @Reference annotation applied to a
constructor parameter, the required attribute MUST have the value true.
[JCA90019]".

See [1] for a discussion on this topic.

PROPOSAL:
Outline of the proposal suggested by SimonN in [1] is as follows:
1. Remove lines 275-276.
2. Change the paragraph at line 273 to read, "If any reference in the cycle
is not a constructor parameter reference, the container may order the
creation of implementation instances and reference injections so that this
reference is injected last in the cycle of references."

++Vamsi
Apache Tuscany Committer  http://tuscany.apache.org
Apache Geronimo Committer and Member of PMC  http://geronimo.apache.org


[1] http://lists.oasis-open.org/archives/sca-j/200902/msg00243.html