title: How to fix "Could not find policy 'pick_first'" with Google TTS java client?
body: <p>I can't make a request using Google TTS Client library in java. Each time it throws a bunch of exceptions. </p>
  
  <p>I just try to get a list of available voices.</p>
  
  <pre><code>    GoogleCredentials creds = null;
      TextToSpeechClient textToSpeechClient = null;
      try {
          creds = GoogleCredentials.fromStream(new FileInputStream(credsFile));
          TextToSpeechSettings settings = TextToSpeechSettings.newBuilder().setCredentialsProvider(FixedCredentialsProvider.create(creds)).build();
          textToSpeechClient = TextToSpeechClient.create(settings);
      } catch (IOException e) {
          e.printStackTrace();
          System.exit(-2);
      }
  
      if (cmd.hasOption('l')) {
          ListVoicesRequest request = ListVoicesRequest.getDefaultInstance();
          ListVoicesResponse response = textToSpeechClient.listVoices(request);
          List&lt;Voice&gt; voices = response.getVoicesList();
          System.out.println("Available voices :");
          for (Voice v : voices) {
              System.out.printf(" - %s, [%d]: %s/%s", v.getName(), v.getLanguageCodesCount(), v.getLanguageCodes(0), v.getSsmlGender());
          }
          textToSpeechClient.close();
          System.exit(0);
      }
  </code></pre>
  
  <p>I first thought it came from the credentials file. But it's not, the file is correctly located.</p>
  
  <p>And I get this.</p>
  
  <pre><code>avr. 02, 2019 11:36:46 PM io.grpc.internal.ManagedChannelImpl$1 uncaughtException
  SEVERE: [Channel&lt;1&gt;: (texttospeech.googleapis.com:443)] Uncaught exception in the SynchronizationContext. Panic!
  java.lang.IllegalStateException: Could not find policy 'pick_first'. Make sure its implementation is either registered to LoadBalancerRegistry or included in META-INF/services/io.grpc.LoadBalancerProvider from your jar files.
          at io.grpc.internal.AutoConfiguredLoadBalancerFactory$AutoConfiguredLoadBalancer.&lt;init&gt;(AutoConfiguredLoadBalancerFactory.java:93)
          at io.grpc.internal.AutoConfiguredLoadBalancerFactory.newLoadBalancer(AutoConfiguredLoadBalancerFactory.java:64)
          at io.grpc.internal.ManagedChannelImpl.exitIdleMode(ManagedChannelImpl.java:357)
          at io.grpc.internal.ManagedChannelImpl$ChannelTransportProvider$1ExitIdleModeForTransport.run(ManagedChannelImpl.java:455)
          at io.grpc.SynchronizationContext.drain(SynchronizationContext.java:101)
          at io.grpc.SynchronizationContext.execute(SynchronizationContext.java:130)
          at io.grpc.internal.ManagedChannelImpl$ChannelTransportProvider.get(ManagedChannelImpl.java:459)
          (...) a whole bunch of other lines
  </code></pre>
  
  <p>How to fix this error ?</p>
  
  <p>Note that I'm using the latest google-cloud-texttospeech library (version 0.85.0-beta).</p>