jaeger-global.java

import java.util.GlobalTracer;

public static void Main() {
  // Don't create any extra objects, unless needed.
  GlobalTracer.registerIfAbsent(TracerCallable.INSTANCE);
  
  Span span = GlobalTracer.get().buildSpan("myOperation").start();
}

class TracerCallable implements Callable<Tracer> {
  public static final TracerCallable INSTANCE = new TracerCallable();
 
  @Override
  public Tracer call(Tracer tracer) {
    // Set configuration
    Configuration configuration = new Configuration("foo");

    // Create Tracer
    return configuration.getTracer();
  }
}