Github user olegz commented on a diff in the pull request:

    https://github.com/apache/nifi/pull/1530#discussion_r103752061
  
    --- Diff: 
nifi-toolkit/nifi-toolkit-tls/src/main/java/org/apache/nifi/toolkit/tls/util/TlsHelper.java
 ---
    @@ -215,4 +210,17 @@ public static JcaPKCS10CertificationRequest 
generateCertificationRequest(String
             JcaContentSignerBuilder jcaContentSignerBuilder = new 
JcaContentSignerBuilder(signingAlgorithm);
             return new 
JcaPKCS10CertificationRequest(jcaPKCS10CertificationRequestBuilder.build(jcaContentSignerBuilder.build(keyPair.getPrivate())));
         }
    +
    +    public static Extensions createDomainAlternativeNamesExtensions(String 
domainAlternativeNames) throws IOException {
    +        List<GeneralName> namesList = new ArrayList<>();
    +        for(String alternativeName : domainAlternativeNames.split(",")) {
    +            namesList.add(new GeneralName(GeneralName.dNSName, 
alternativeName));
    +        }
    +
    --- End diff --
    
    Since we're on Java 8 may be we should start embracing it a bit more, at 
least for simple things like the above
    ```
    List<GeneralName> namesList = Stream.of(domainAlternativeNames.split(","))
                        .map(alternativeName -> new 
GeneralName(GeneralName.dNSName, alternativeName))
                        .collect(Collectors.toList());
    ```


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