src/main/java/com/amazonaws/encryptionsdk/kms/KmsMasterKeyProvider.java [381:414]:
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      List<String> keyIds,
      List<String> grantTokens,
      boolean isDiscovery,
      DiscoveryFilter discoveryFilter) {
    if (!isDiscovery && (keyIds == null || keyIds.isEmpty())) {
      throw new IllegalArgumentException(
          "Strict mode must be configured with a non-empty " + "list of keyIds.");
    }
    if (!isDiscovery && keyIds.contains(null)) {
      throw new IllegalArgumentException(
          "Strict mode cannot be configured with a " + "null key identifier.");
    }
    if (!isDiscovery && discoveryFilter != null) {
      throw new IllegalArgumentException(
          "Strict mode cannot be configured with a " + "discovery filter.");
    }
    // If we don't have a default region, we need to check that all key IDs will be usable
    if (!isDiscovery && defaultRegion == null) {
      for (String keyId : keyIds) {
        final AwsKmsCmkArnInfo arnInfo = parseInfoFromKeyArn(keyId);
        if (arnInfo == null) {
          throw new AwsCryptoException(
              "Can't use non-ARN key identifiers or aliases when " + "no default region is set");
        }
      }
    }

    this.regionalClientSupplier_ = supplier;
    this.defaultRegion_ = defaultRegion;
    this.keyIds_ = Collections.unmodifiableList(new ArrayList<>(keyIds));

    this.isDiscovery_ = isDiscovery;
    this.discoveryFilter_ = discoveryFilter;
    this.grantTokens_ = grantTokens;
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src/main/java/com/amazonaws/encryptionsdk/kmssdkv2/KmsMasterKeyProvider.java [259:292]:
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      List<String> keyIds,
      List<String> grantTokens,
      boolean isDiscovery,
      DiscoveryFilter discoveryFilter) {
    if (!isDiscovery && (keyIds == null || keyIds.isEmpty())) {
      throw new IllegalArgumentException(
          "Strict mode must be configured with a non-empty " + "list of keyIds.");
    }
    if (!isDiscovery && keyIds.contains(null)) {
      throw new IllegalArgumentException(
          "Strict mode cannot be configured with a " + "null key identifier.");
    }
    if (!isDiscovery && discoveryFilter != null) {
      throw new IllegalArgumentException(
          "Strict mode cannot be configured with a " + "discovery filter.");
    }
    // If we don't have a default region, we need to check that all key IDs will be usable
    if (!isDiscovery && defaultRegion == null) {
      for (String keyId : keyIds) {
        final AwsKmsCmkArnInfo arnInfo = parseInfoFromKeyArn(keyId);
        if (arnInfo == null) {
          throw new AwsCryptoException(
              "Can't use non-ARN key identifiers or aliases when " + "no default region is set");
        }
      }
    }

    this.regionalClientSupplier_ = supplier;
    this.defaultRegion_ = defaultRegion;
    this.keyIds_ = Collections.unmodifiableList(new ArrayList<>(keyIds));

    this.isDiscovery_ = isDiscovery;
    this.discoveryFilter_ = discoveryFilter;
    this.grantTokens_ = grantTokens;
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