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

Since this issue is still open at the time of writing (version 3.0.X) RESTEASY: deprecated Apache classes cleanup

You can go deeper to use the newer, non-deprecated classes instead to create you resteasy client. You will also have more control over how you want the pool to be etc.

Here is what I did:

// This will create a threadsafe JAX-RS client using pooled connections.
// Per default this implementation will create no more than than 2
// concurrent connections per given route and no more 20 connections in
// total. (see javadoc of PoolingHttpClientConnectionManager)
PoolingHttpClientConnectionManager cm =
        new PoolingHttpClientConnectionManager();

CloseableHttpClient closeableHttpClient =
        HttpClientBuilder.create().setConnectionManager(cm).build();
ApacheHttpClient4Engine engine =
        new ApacheHttpClient4Engine(closeableHttpClient);
return new ResteasyClientBuilder().httpEngine(engine).build();

Also make sure you release the connection after making a call. Calling response.close() will do that for you so probably put that in a finally block.