Hi John,

I would probably use CDI over using a ThreadLocal. That said, I did a little testing with using a client in a new thread and did not have any issues in EAP 7.3.8. The Client itself should be thread-safe. The question would be more is the context setup correctly.

For CDI here's what I've done upstream for RESTEasy 6.1 to allow a client to be injected. It should work for Jakarta EE 8 too. https://github.com/resteasy/resteasy/blob/bd243c393e88481b797fb4371c18a4492fc45915/resteasy-cdi/src/main/java/org/jboss/resteasy/cdi/ResteasyCdiExtension.java#L105-L130

On Sun, May 8, 2022 at 7:25 AM John Ulrik <ujay68@gmail.com> wrote:

Thanks, James. Currently running in JBoss EAP 7.3.10, among others (not my choice to make, actually), but this is a more general question. Sounds like I should make a ThreadLocal of Clients to be safe. Also this is not about universal, formal thread-safety but whether I can use a once-initialized Client instance, with no configuration changes made further on, in more than one thread concurrently (typically servlet request threads of the container).
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