RestEasyReactive Client no longer maps List items in query param as multivalued query field in JDK21

[Alex-Wauters]

Describe the bug

With quarkus-resteasy-reactive, the behavior of mapping a List<> to a query param appears to have changed when running on OpenJDK 21.

Example resteasy reactive interface client:

@GET
@Path("/exampleAPI")
@Produces(APPLICATION_JSON)
Uni<List<ResponseDTO>> doRequest(
    @RestQuery("status") List<EnumField> statuses,
) throws BaseException;

Expected behavior

The above code snippet maps in OpenJdk17 to

http://service:8080/exampleAPI?status=PUBLISHED&status=RELEASED

Actual behavior

After updating to JDK21 (Amazoncoretto), it maps to

http://service:8080/exampleAPI?status=%5BPUBLISHED%2C+RELEASED%5D

or URL-decoded:

http://service:8080/exampleAPI?status=[PUBLISHED,+RELEASED]

How to Reproduce?

Create a RESTEASY Reactive Rest client method that accepts a List of enum fields.

Output of uname -a or ver

No response

Output of java -version

openjdk version "21" 2023-09-19 OpenJDK Runtime Environment (build 21+35-2513) OpenJDK 64-Bit Server VM (build 21+35-2513, mixed mode, sharing)

GraalVM version (if different from Java)

No response

Quarkus version or git rev

3.3.3

Build tool (ie. output of mvnw --version or gradlew --version)

maven 3.9.4

Additional information

No response

[quarkus-bot]

/cc @FroMage (resteasy-reactive), @stuartwdouglas (resteasy-reactive)

[geoand]

Weird, I'll have to try it out.

[geoand]

I cannot reproduce the problem with OpenJDK 21

[FroMage]

Just in case you missed it (I did at first), this is about the client, not the server.

[geoand]

I did indeed :)

[FroMage]

:)

[Alex-Wauters]

Adding an example repo in just a few moments

[Alex-Wauters]

https://github.com/Alex-Wauters/quarkus-resteasy-listparam-bug

Run and launch a request to http://localhost:8080/hello - it makes a request to itself and logs the request to console

2023-09-28 12:05:35,136 INFO  [io.quarkus] (Quarkus Main Thread) Installed features: [cdi, rest-client-reactive, rest-client-reactive-jackson, resteasy-reactive, smallrye-context-propagation, vertx]
2023-09-28 12:05:35,137 INFO  [io.qua.dep.dev.RuntimeUpdatesProcessor] (vert.x-worker-thread-1) Live reload total time: 0.490s 
2023-09-28 12:05:35,192 DEBUG [org.jbo.res.rea.cli.log.DefaultClientLogger] (vert.x-eventloop-thread-1) Request: GET http://localhost:8080/exampleAPI?status=%5BIN_PROGRESS%2C+PUBLISHED%5D Headers[Accept=text/plain;charset=UTF-8 User-Agent=Resteasy Reactive Client], Empty body
2023-09-28 12:05:35,197 DEBUG [org.jbo.res.rea.cli.log.DefaultClientLogger] (vert.x-eventloop-thread-1) Response: GET http://localhost:8080/exampleAPI?status=%5BIN_PROGRESS%2C+PUBLISHED%5D, Status[200 OK], Headers[content-length=47 Content-Type=text/plain;charset=UTF-8], Body:
Received request - see console logs for params 

Where exampleAPI?status=%5BIN_PROGRESS%2C+PUBLISHED%5D
differs from exampleAPI?status=IN_PROGRESS&status=PUBLISHED

JDK:
openjdk 21 2023-09-19
OpenJDK Runtime Environment (build 21+35-2513)
OpenJDK 64-Bit Server VM (build 21+35-2513, mixed mode, sharing)

[Alex-Wauters]

Here's the output of the same code running on openJDK17:

2023-09-28 12:17:41,933 DEBUG [org.jbo.res.rea.cli.log.DefaultClientLogger] (vert.x-eventloop-thread-1) Request: GET http://localhost:8080/exampleAPI?status=IN_PROGRESS&status=PUBLISHED Headers[Accept=text/plain;charset=UTF-8 User-Agent=Resteasy Reactive Client], Empty body
2023-09-28 12:17:41,939 DEBUG [org.jbo.res.rea.cli.log.DefaultClientLogger] (vert.x-eventloop-thread-1) Response: GET http://localhost:8080/exampleAPI?status=IN_PROGRESS&status=PUBLISHED, Status[200 OK], Headers[content-length=47 Content-Type=text/plain;charset=UTF-8], Body:
Received request - see console logs for params 

[geoand]

Thanks

[geoand]

This is an interesting one, I'll soon have a fix for.

[geoand]

#36197 is the fix