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

First, do not reuse WebTarget. For simplicity, you can always create new WebTarget.

Second, if you're using Resteasy, you can add provided dependency for Resteasy client to your project. Example in Gradle:

    provided 'org.jboss.resteasy:resteasy-client:3.0.14.Final'

Then, you can create your connection like this:

        ResteasyClientBuilder builder = new ResteasyClientBuilder();
        builder.connectionPoolSize(200);

There is no need to set maxPooledPerRoute, this is set automatically by RestEasy (can be found in RestEasyClientBuilder class source code).

When you set connectionPoolSize, you will no longer get error when Client is reused and you can happily re-use them all across the application. I've tried this solution on many projects and it actually works well. But when you deploy your application to a non-resteasy container (like Glassfish), your code won't work and you will have to use ClientBuilder class again.