src/main/java/com/amazonaws/encryptionsdk/kms/AwsKmsMrkAwareMasterKeyProvider.java [317:338]:
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    static AWSKMSClientBuilder cloneClientBuilder(final AWSKMSClientBuilder builder) {
      // We need to copy all arguments out of the builder in case it's mutated later on.
      // Unfortunately AWSKMSClientBuilder doesn't support .clone() so we'll have to do it by hand.

      if (builder.getEndpoint() != null) {
        // We won't be able to set the region later if a custom endpoint is set.
        throw new IllegalArgumentException(
            "Setting endpoint configuration is not compatible with passing a "
                + "builder to the KmsMasterKeyProvider. Use withCustomClientFactory"
                + " instead.");
      }

      final AWSKMSClientBuilder newBuilder = AWSKMSClient.builder();
      newBuilder.setClientConfiguration(builder.getClientConfiguration());
      newBuilder.setCredentials(builder.getCredentials());
      newBuilder.setEndpointConfiguration(builder.getEndpoint());
      newBuilder.setMetricsCollector(builder.getMetricsCollector());
      if (builder.getRequestHandlers() != null) {
        newBuilder.setRequestHandlers(builder.getRequestHandlers().toArray(new RequestHandler2[0]));
      }
      return newBuilder;
    }
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src/main/java/com/amazonaws/encryptionsdk/kms/KmsMasterKeyProvider.java [194:215]:
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    AWSKMSClientBuilder cloneClientBuilder(final AWSKMSClientBuilder builder) {
      // We need to copy all arguments out of the builder in case it's mutated later on.
      // Unfortunately AWSKMSClientBuilder doesn't support .clone() so we'll have to do it by hand.

      if (builder.getEndpoint() != null) {
        // We won't be able to set the region later if a custom endpoint is set.
        throw new IllegalArgumentException(
            "Setting endpoint configuration is not compatible with passing a "
                + "builder to the KmsMasterKeyProvider. Use withCustomClientFactory"
                + " instead.");
      }

      final AWSKMSClientBuilder newBuilder = AWSKMSClient.builder();
      newBuilder.setClientConfiguration(builder.getClientConfiguration());
      newBuilder.setCredentials(builder.getCredentials());
      newBuilder.setEndpointConfiguration(builder.getEndpoint());
      newBuilder.setMetricsCollector(builder.getMetricsCollector());
      if (builder.getRequestHandlers() != null) {
        newBuilder.setRequestHandlers(builder.getRequestHandlers().toArray(new RequestHandler2[0]));
      }
      return newBuilder;
    }
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