src/main/java/com/amazonaws/encryptionsdk/kms/AwsKmsMrkAwareMasterKeyProvider.java [369:388]:
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    if (!isDiscovery && (keyIds == null || keyIds.isEmpty())) {
      throw new IllegalArgumentException(
          "Strict mode must be configured with a non-empty " + "list of keyIds.");
    }
    // = compliance/framework/aws-kms/aws-kms-mrk-aware-master-key-provider.txt#2.6
    // # The key id
    // # list MUST NOT contain any null or empty string values.
    if (!isDiscovery && (keyIds.contains(null) || keyIds.contains(""))) {
      throw new IllegalArgumentException(
          "Strict mode cannot be configured with a " + "null key identifier.");
    }

    // = compliance/framework/aws-kms/aws-kms-mrk-aware-master-key-provider.txt#2.6
    // # All AWS KMS
    // # key identifiers are be passed to Assert AWS KMS MRK are unique (aws-
    // # kms-mrk-are-unique.md#Implementation) and the function MUST return
    // # success.
    assertMrksAreUnique(keyIds);
    if (!isDiscovery
        && defaultRegion == null
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src/main/java/com/amazonaws/encryptionsdk/kmssdkv2/AwsKmsMrkAwareMasterKeyProvider.java [310:333]:
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    if (!isDiscovery && (keyIds == null || keyIds.isEmpty())) {
      throw new IllegalArgumentException(
          "Strict mode must be configured with a non-empty " + "list of keyIds.");
    }
    // = compliance/framework/aws-kms/aws-kms-mrk-aware-master-key-provider.txt#2.6
    // # The key id
    // # list MUST NOT contain any null or empty string values.
    if (!isDiscovery && (keyIds.contains(null) || keyIds.contains(""))) {
      throw new IllegalArgumentException(
          "Strict mode cannot be configured with a " + "null key identifier.");
    }

    // = compliance/framework/aws-kms/aws-kms-mrk-aware-master-key-provider.txt#2.6
    // # All AWS KMS
    // # key identifiers are be passed to Assert AWS KMS MRK are unique (aws-
    // # kms-mrk-are-unique.md#Implementation) and the function MUST return
    // # success.
    assertMrksAreUnique(keyIds);
    /* Precondition: A region is required to contact AWS KMS.
     * This is an edge case because the default region will be the same as the SDK default,
     * but it is still possible.
     */
    if (!isDiscovery
        && defaultRegion == null
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