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[640][WFLY-19866] Add an analysis document for promoting the MicroPro…
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---
categories:
- microprofile
- jaxrs
stability-level: default
issue: https://github.com/wildfly/wildfly-proposals/issues/640
feature-team:
developer: jamezp
sme:
- jamezp
outside-perspective:
- marekkopecky
promotes: https://issues.redhat.com/browse/WFLY-19866
promoted-by: https://github.com/wildfly/wildfly-proposals/issues/640
---
= Promote MicroProfile REST Client 4.0 from Preview to Default Stability Level
:author: James R. Perkins
:email: jperkins@redhat.com
:toc: left
:icons: font
:idprefix:
:idseparator: -

== Overview

This document is about promoting the http://download.eclipse.org/microprofile/microprofile-rest-client-4.0/microprofile-rest-client-spec-4.0.html[MicroProfile REST Client 4.0]
from a stability level of `preview` to a stability level of `default`.

As you'll see in the release notes below, not much was added to the MicroProfile REST Client 4.0 API. There are only two
new methods added to the `RestClientBuilder` API.

=== User Stories

A user wants to use the MicroProfile REST Client version 4.0 or use MicroProfile Platform 7.0.

== Issue Metadata

=== Related Issues

* https://issues.redhat.com/browse/WFLY-19866[WFLY-19866] - Promotion from `preview` to `default`
* https://issues.redhat.com/browse/WFLY-19589[WFLY-19589] - Integration of MicroProfile REST Client 4.0 into WildFly Preview
* https://issues.redhat.com/browse/WFLY-19588[WFLY-19588] - MicroProfile Platform 7.0

=== Affected Projects or Components

* https://github.com/wildfly/wildfly

=== Other Interested Projects

Any project wanting either the MicroProfile REST Client version 4.0 or MicroProfile Platform 7.0. There are two new
methods on the `RestClientBuilder` for user convenience.

* `baseUri(String)`: This was added as an alternative to `baseUri(URI)` and `baseUrl(URL)`. It allows a simple
`java.lang.String` to be used instead of having to create a `java.net.URI` or `java.net.URL` first.
* `header(String, Object)`: Adds a header to which will be used on all requests with the built client. Headers added via
this method will be merged with the headers added via `@ClientHeaderParam` annotations, `@HeaderParam` annotations, and
`ClientHeadersFactory` implementations.

=== Relevant Installation Types

* Traditional standalone server (unzipped or provisioned by Galleon)
* Managed domain
* OpenShift Source-to-Image (S2I)
* Bootable jar

== Requirements

The MicroProfile REST Client API and the RESTEasy MicroProfile implementation must be upgraded to be compliant with the
https://download.eclipse.org/microprofile/microprofile-7.0/microprofile-spec-7.0.html[MicroProfile 7.0 Specification].

There are no specific integration requirements as this is about upgrading an API and implementation.

=== Changed requirements

The only change here is migrating from the MicroProfile REST Client 3.0 API to the MicroProfile REST Client 4.0 API and
RESTEasy MicroProfile 2.1 to RESTEasy MicroProfile 3.0.

=== Non-Requirements

N/A

=== Future Work

N/A

== Backwards Compatibility

There are no backwards compatibility issues. The new API has only added two new methods to the `RestClientBuilder` API.

=== Default Configuration

There are currently no configuration options for the integration and no new ones will be added.

=== Importing Existing Configuration

There is no issue using a current WildFly configuration with this change.

=== Deployments

There is no incompatible changes to the API or implementation. Deployments will simply see the newer versions available
on their class path.

=== Interoperability

N/A

== Implementation Plan

The implementation plan is to simply upgrade versions of the required components.

One note is that TCK POM configuration needed some changes. However, that is only for testing.

== Admin Clients

This change has no affect on admin clients. There are no model changes.

== Security Considerations

There would be no changes to security considerations for this upgrade.

[[test_plan]]
== Test Plan

The test plan here is to rely on the MicroProfile REST Client TCK and the tests in
https://github.com/resteasy/resteasy-microprofile[RESTEasy MicroProfile]. There are TCK tests for all the new features
and some new TCK tests that were previously missed in the last TCK release.

Some of the other MicroProfile TCK's and integration tests use the the MicroProfile REST Client. Some indirect testing
will happen there as well.

These TCK's run as part of a full WildFly build.

There will not be any manual testing at this time as these new features are simply convenience methods for existing
methods. New TCK tests were also added for these. Therefore, there is some build-in integration testing.

== Community Documentation

There seems to be no documentation for the MicroProfile REST Client short of noting the version. The version matrix
documentation will be updated.

== Release Note Content

In this release there was an alignment with https://jakarta.ee/specifications/restful-ws/3.1/jakarta-restful-ws-spec-3.1[Jakarta RESTful Web Services 3.1]
to be compatible with Jakarta EE 10.

* There was a clarification about closing the REST client when being injected via CDI (https://github.com/eclipse/microprofile-rest-client/issues/348[348]).
* The RestClientBuilder added a new method, baseUri(String) (https://github.com/eclipse/microprofile-rest-client/issues/334[334]).
* The RestClientBuilder also added a new header(String, Object) method for adding headers to the built REST Client. The headers will be merged with headers added via other means (https://github.com/eclipse/microprofile-rest-client/issues/283[283]).

Two New Helper Methods:

* `baseUri(String)`: This was added as an alternative to `baseUri(URI)` and `baseUrl(URL)`. It allows a simple
`java.lang.String` to be used instead of having to create a `java.net.URI` or `java.net.URL` first.
* `header(String, Object)`: Adds a header to which will be used on all requests with the built client. Headers added via
this method will be merged with the headers added via `@ClientHeaderParam` annotations, `@HeaderParam` annotations, and
`ClientHeadersFactory` implementations.

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