On Fri, 29 Apr 2022 17:11:55 GMT, Mark Reinhold <m...@openjdk.org> wrote:
>> src/java.base/share/classes/java/lang/System.java line 743:
>>
>>> 741: * have the value {@code "1"}; after a second maintenance
>>> 742: * release, this property will have the value {@code "2"},
>>> 743: * and so on.
>>
>> There should be no requirement that values be allocated sequentially. In
>> other words, if JCP MR <x> does not require an RI, then it should not be
>> surprising if there is no JDK build with maintenance version <x>. As an
>> example, JSR 337 MR 1 and MR 2 both used the same RI. If this system
>> property had existed during development of MR 1, it would return "1". Since
>> no RI was submitted for MR 2, a build returning "2" should never exist. MR
>> 3 did update the RI, so it would return "3".
>
> @irisclark does raise an interesting point: If, say, MR 2 doesn’t require a
> change to the RI then the MR 1 RI is also the MR 2 RI, but its
> `java.specification.maintenance.version` property will report that it’s the
> MR 1 RI.
>
> One way to fix this would be to require an RI update with every MR just to
> update this property, even if no other code in the RI changes — but we prefer
> to avoid doing RI builds unnecessarily.
>
> Another way to fix it would be to finesse the specification of this property,
> perhaps:
>
>
> * <tr><th scope="row">{@systemProperty
> java.specification.maintenance.version}</th>
> * <td>Java Runtime Environment specification maintenance version,
> which may
> * be interpreted as a non-zero integer. If defined, the value of
> this
> * property is the identifying number of the most recent <a
> * href="https://jcp.org/en/procedures/jcp2#3.6.4";>specification
> * maintenance release</a> that required a change to the
> runtime</a>
> * <em>(optional)</em>.
> * </td></tr>
In the latest push, to address the concerns raised updated the proposed wording
to, in plain text:
Java Runtime Environment specification maintenance version, not defined before
the specification implemented by this runtime has undergone a maintenance
release (optional). When defined, the value of this property may be interpreted
as a positive integer. The value indicates the latest maintenance release the
runtime is known to support. A later release may be supported by the
environment. To indicate the first maintenance release this property will have
the value "1"; to indicate the second maintenance release, this property will
have the value "2", and so on.
-------------
PR: https://git.openjdk.java.net/jdk/pull/8437
