Reusing JAX RS Client in multi-threaded environment (with resteasy)

Question

According to the documentation,

\"Clients are heavy-weight objects that manage the client-side communication infrastructure. Initialization as well

Answer 1

Your implementation is not thread-safe. When two threads access someMethod at the same time they are sharing the same Client and one will try to make a second request while the first one is not finished.

You have two choices:

• Synchronize the access to the Client and WebTarget manually.
• Let the container manage concurrency by annotating the enclosing type with @javax.ejb.Singleton which guarantees thread safety. (see chapter 4.8.5 of the EJB specification)

If someMethod in a container managed environment I would use the second approach.