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It is also worth to mention the way Apache CXF attaches the description to spans. With regards to the client integration, the description becomes a full URL being invoked prefixed by HTTP method, for example: GET http://localhost:8282/books. On the server side integration, the description becomes a relative JAX-RS resource path prefixed by HTTP method, f.e.: GET books, POST book/123 

Configuring Client

In this section and below, all the code snippets are going to be based on Jaeger distributed tracing framework (release 0.20.6+), although everything we are going to discuss is equally applicable to any other existing alternatives. Essentially, the only dependency Apache CXF integration relies on is the Tracer instance.

There are a couple of ways the JAX-RS client could be configured, depending on the client implementation. Apache CXF provides its own WebClient which could be configured just like that (in future versions, there would be a simpler ways to do that using client specific features):

Code Block
java
java
final Tracer tracer = new Configuration("web-client", 
        new Configuration.SamplerConfiguration(ConstSampler.TYPE, 1), /* or any other Sampler */
        new Configuration.ReporterConfiguration(new HttpSender("http://localhost:14268/api/traces")) /* or any other Sender */
    ).getTracer();
                
Response response = WebClient
    .create("http://localhost:9000/catalog", Arrays.asList(new OpenTracingClientProvider(tracer)))
    .accept(MediaType.APPLICATION_JSON)
    .get();

The configuration based on using the standard JAX-RS Client is very similar:

Code Block
java
java
final Tracer tracer = new Configuration("jaxrs-client", 
        new Configuration.SamplerConfiguration(ConstSampler.TYPE, 1), /* or any other Sampler */
        new Configuration.ReporterConfiguration(new HttpSender("http://localhost:14268/api/traces")) /* or any other Sender */
    ).getTracer();
                
final OpenTracingClientProvider provider = new OpenTracingClientProvider(tracer);
final Client client = ClientBuilder.newClient().register(provider);
    
final Response response = client
  .target("http://localhost:9000/catalog")
  .request()
  .accept(MediaType.APPLICATION_JSON)
  .get();