avoid auto-config warning (#7881)

Author: zeitlinger

exporters/common/src/main/java/io/opentelemetry/exporter/internal/grpc/GrpcExporterBuilder.java

@@ -66,7 +66,8 @@ public class GrpcExporterBuilder<T extends Marshaler> {
   private Supplier<Map<String, String>> headerSupplier = Collections::emptyMap;
   private TlsConfigHelper tlsConfigHelper = new TlsConfigHelper();
   @Nullable private RetryPolicy retryPolicy = RetryPolicy.getDefault();
-  private Supplier<MeterProvider> meterProviderSupplier = GlobalOpenTelemetry::getMeterProvider;
+  private Supplier<MeterProvider> meterProviderSupplier =
+      () -> GlobalOpenTelemetry.getOrNoop().getMeterProvider();
   private InternalTelemetryVersion internalTelemetryVersion = InternalTelemetryVersion.LEGACY;
 
   private ComponentLoader componentLoader =

exporters/common/src/main/java/io/opentelemetry/exporter/internal/http/HttpExporterBuilder.java

@@ -64,7 +64,8 @@ public final class HttpExporterBuilder<T extends Marshaler> {
 
   private TlsConfigHelper tlsConfigHelper = new TlsConfigHelper();
   @Nullable private RetryPolicy retryPolicy = RetryPolicy.getDefault();
-  private Supplier<MeterProvider> meterProviderSupplier = GlobalOpenTelemetry::getMeterProvider;
+  private Supplier<MeterProvider> meterProviderSupplier =
+      () -> GlobalOpenTelemetry.getOrNoop().getMeterProvider();
   private InternalTelemetryVersion internalTelemetryVersion = InternalTelemetryVersion.LEGACY;
   private ComponentLoader componentLoader =
       ComponentLoader.forClassLoader(HttpExporterBuilder.class.getClassLoader());

exporters/zipkin/src/main/java/io/opentelemetry/exporter/zipkin/ZipkinSpanExporterBuilder.java

@@ -33,7 +33,8 @@ public final class ZipkinSpanExporterBuilder {
   // which is created when no custom sender is set (see OkHttpSender.Builder)
   private boolean compressionEnabled = true;
   private int readTimeoutMillis = (int) TimeUnit.SECONDS.toMillis(10);
-  private Supplier<MeterProvider> meterProviderSupplier = GlobalOpenTelemetry::getMeterProvider;
+  private Supplier<MeterProvider> meterProviderSupplier =
+      () -> GlobalOpenTelemetry.getOrNoop().getMeterProvider();
   private InternalTelemetryVersion internalTelemetryVersion = InternalTelemetryVersion.LEGACY;
 
   /**