Java version support

[kekbur]

Does Quarkus have its supported Java versions documented anywhere? I can find blog posts that say 11 is the minimum and 17 is the recommended version, but it would be nice to have some obvious and up-to-date place for this information.

The reason I ask is that I was eager to test Quarkus with OpenJDK 21 released yesterday, and found a problem with the way List query parameters are handled by Resteasy Reactive client. The problem does not appear with Java 17 or 20.

Given this API client:

@ApplicationScoped
@RegisterRestClient(configKey = "test-api", baseUri = "https://httpbin.org")
public interface TestApi
{
	@GET
	@Path("/get")
	public Map<String, Object> getRequest(@QueryParam("name") List<String> values);
}

This test fails under Java 21:

Map<String, Object> response = api.getRequest(List.of("one", "two"));
assertEquals("https://httpbin.org/get?name=one&name=two", response.get("url"));

The resulting incorrect request URL is this: https://httpbin.org/get?name=[one, two]

The bug has been fixed: #36170

[brunobat]

The recommended Java versions can be seen in the github repo at https://github.com/quarkusio/quarkus:

[kekbur]

Oh, I missed that. Thank you for pointing it out.