final BarListener filter = new BarListener();
final BarListener filter2 = new BarListener2();
// ClientRuntime initializes lazily, so it is forced by invoking a (dummy) request
client.register(filter2); // instance registered into client
client.target(getBaseUri()).register(filter).request().get(String.class); // instance registration into target
assertTrue("Filter was expected to be already initialized.", filter.isInitialized());
assertTrue("Filter2 was expected to be already initialized.", filter2.isInitialized());