RE: [sca-j] NEW ISSUE: Constructor selection algorithm is not well defined - [JAVA-145]

["Mark Combellack" <mcombellack@avaya.com>]

Hi Simon,

I have raised this as new issue 145. See
http://www.osoa.org/jira/browse/JAVA-145

Thanks,

Mark

> -----Original Message-----
> From: Simon Nash [mailto:oasis@cjnash.com]
> Sent: 19 March 2009 20:30
> To: OASIS Java
> Subject: [sca-j] NEW ISSUE: Constructor selection algorithm is not
well
> defined
> 
> TARGET: Java Component Implementation
> 
> DESCRIPTION: Constructor selection algorithm is not well defined
> 
> Conformance statement JCI50004 says the following:
> 
> The constructor to use for the creation of an implementation instance
> MUST be selected by the SCA runtime using the sequence:
> 1. A declared constructor annotated with a @Constructor annotation.
> 2. A declared constructor that unambiguously identifies all property
>     and reference values.
> 3. A no-argument constructor.
> 
> There are two problems with the wording of step 2:
> 
> a) The phrase "identifies all property and reference values" could
>     be taken to mean that all the implementation's properties
>     and references must be specified on the constructor.  I believe
>     this was not the intention.
> 
> b) Step 2 is not sufficiently well defined to cover all cases.  What
if
>     there are two constructors (not marked @Constructor) that both
have
>     all of their parameters marked with either @Property or
@Reference?
>     For example, constructor C1 could have parameters P1 and R1 and
>     constructor C2 could have parameters P1, P2 and R1.  Is this
illegal,
>     or is C2 chosen because it is more "unambiguous" than C1?
> 
> PROPOSAL:
> 
> Replace step 2 of JCI50004 by the following:
> 
> 2. A declared constructor, all of whose parameters are annotated with
>     either @Property or @Reference.
> 
> After JCI50002, add the following:
> 
> The SCA runtime MUST raise an error if there are multiple constructors
> that are not annotated with @Constructor and have a non-empty
parameter
> list with all parameters annotated with either @Property or
@Reference.
> [JCI50005]
> 
> 
> 
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