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Re: [jakartaee-platform-dev] Continue semantic versioning discussion...

In the words of Bill Shannon, let's put this "discussion to bed"...  :-)

Thanks for the discussion.  I also spoke with BJ (he brought up the item about the package versioning).  He agreed that it was not necessary to reset the package version to 1.0.0.  We can start the package versioning at any number.  His main interest is that we continue to increment the versions according to the rules of semantic versioning.  And, since we have stated our interest in that goal since the start, I think we're in good shape.

Based on all of this input, here's the proposal.  I won't claim it's a "decision" until Tuesday's meeting since it was left over agenda item.

1.  Spec level versioning.  Due to the change from javax.* to jakarta.*, all of the individual Jakarta components will need to increase their major version for the Spec (x.y) and API (x.y.z).  

Using JPA as an example, this would require a new entry in the maven repo for a 3.0.0 release of the API, which would have the following coordinates:

<!--
https://mvnrepository.com/artifact/jakarta.persistence/jakarta.persistence-api-->
<dependency>
   <groupId>jakarta.persistence</groupId>
   <artifactId>jakarta.persistence-api</artifactId>
   <version>3.0.0</version>
</dependency>



2.  Package level versioning.
 The exported package names in the MANIFEST.MF should also be increased to the new major version.  


Again, using JPA as an example, the MANIFEST.MF for JPA 3.0.0 would look something like this:

Export-Package: jakarta.persistence.metamodel;version="3.0.0",jakarta.persis
tence;uses:="jakarta.persistence.criteria,jakarta.persistence.metamodel,jav
ax.persistence.spi";version="3.0.0",jakarta.persistence.criteria;uses:="j
akarta.persistence,jakarta.persistence.metamodel";version="3.0.0",jakarta.per
sistence.spi;uses:="jakarta.persistence,javax.sql";version="3.0.0"




---------------------------------------------------
Kevin Sutter
STSM, MicroProfile and Jakarta EE architect
e-mail:  sutter@xxxxxxxxxx     Twitter:  @kwsutter
phone: tl-553-3620 (office), 507-253-3620 (office)    
LinkedIn:
https://www.linkedin.com/in/kevinwsutter



From:        "Kevin Sutter" <sutter@xxxxxxxxxx>
To:        "jakartaee-platform developer discussions" <jakartaee-platform-dev@xxxxxxxxxxx>
Date:        11/19/2019 14:44
Subject:        [EXTERNAL] [jakartaee-platform-dev] Continue semantic versioning discussion...
Sent by:        jakartaee-platform-dev-bounces@xxxxxxxxxxx




Hi,
At the end of our Platform Dev call this morning, we started to discuss the versioning of the Jakarta Component specs due to the jakarta namespace update.  As an example, with the jakarta package rename, should the next version of CDI be 2.x or 3.0?  This was initially brought up as part of this thread:

https://www.eclipse.org/lists/jakartaee-platform-dev/msg00862.html

The initial response on the call was "Yes", the major version of the CDI Spec must increase with the change in package names.


But, as we continued talking, it was clear there were two aspects (at least) of semantic versioning that come into play.
  1. Semantic versioning at the Spec level (ie. JPA 2.2 -> 3.0)
  2. Semantic versioning at the Package level (ie. javax.persistence.* -> jakarta.persistence.*)

1.  Spec level versioning.
 I'm going to assume that the initial response is still accurate and we expect the individual Jakarta components to increase the major version of their Specs.  Sticking with the JPA example, this would require a new entry in the maven repo for a 3.0 release, which would have the following coordinates:


<!--
https://mvnrepository.com/artifact/jakarta.persistence/jakarta.persistence-api-->
<dependency>
   <groupId>jakarta.persistence</groupId>
   <artifactId>jakarta.persistence-api</artifactId>
   <version>3.0.0</version>
</dependency>


This usage would allow proper dependency management at the macro level -- at the Spec and API level.


2.  Package level versioning.
 This is what BJ brought up at the end of the call.  As an example, look at the MANIFEST.MF for JPA 2.2.3:


Export-Package: javax.persistence.metamodel;version="2.2.3",javax.persis
tence;uses:="javax.persistence.criteria,javax.persistence.metamodel,jav
ax.persistence.spi";version="2.2.3",javax.persistence.criteria;uses:="j
avax.persistence,javax.persistence.metamodel";version="2.2.3",javax.per
sistence.spi;uses:="javax.persistence,javax.sql";version="2.2.3"


Since we're moving from javax.persistence.* to jakarta.persistence.*, this is technically a new API package and, thus, should start over at 1.0.0.  A few questions come to mind here...
  • If we claim we want to follow semantic versioning, does it require us to recognize this name change and start over at "1.0.0" with the package export?  Or, can we decide that this change from javax to jakarta is just a continuation of the old package and use "3.0.0" for the jakarta.persistence.* packages?
  • If it's decided that the jakarta.persistence.* package rename requires a "1.0.0", does it make sense to have different package versions from the external Spec/API version?  In this case, the packages would be exported as "1.0.0", but the Spec would be at "3.0".
  • Do we even care?  Do any of the Jakarta components currently import packages with specific version numbers?  The JPA MANIFEST just imports the package names with no versions.  I know this comes into play with an OSGI-based system (we use both export and import packages with versions in Open Liberty, for example).  But, do we need or want to incorporate that level of dependency mgmt on everyone using Jakarta EE?

I have my thoughts on what we should do, but let's start with the discussion first.  Thanks.

---------------------------------------------------
Kevin Sutter
STSM, MicroProfile and Jakarta EE architect
e-mail:  sutter@xxxxxxxxxx     Twitter:  @kwsutter
phone: tl-553-3620 (office), 507-253-3620 (office)    
LinkedIn:
https://www.linkedin.com/in/kevinwsutter_______________________________________________
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