[jira] [Commented] (NIFI-7592) Allow NiFi to be started without a GUI/REST interface

["Matt Burgess (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/NIFI-7592?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17148927#comment-17148927 ] 

Matt Burgess commented on NIFI-7592:
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I propose to replace the need for a JettyServer (which is the NiFi class that loads all the Web/UI WARs, etc.), we instead use its parent interface NiFiServer, and rather than use reflection and require the need for the nifi-jetty NAR, we instead move the NiFi JettyServer-specific code out to a "nifi-server-nar". Then as an alternative we could add a "minifi-server-nar" for example, that also implements NiFiServer but does similar startup code as MiNiFi does today. The NiFi assembly would package only nifi-server-nar for now, but later as MINIFI-422 progresses, we would have a MiNiFi assembly that instead packages the minifi-server-nar, which doesn't require all the Web/UI stuff.

This would allow us to replace the coupling of the web stuff with a ServiceLoader that can search the NARs for a NiFiServer implementation. Exactly one would be allowed, zero or more than one should result in failure to start.

> Allow NiFi to be started without a GUI/REST interface
> -----------------------------------------------------
>
>                 Key: NIFI-7592
>                 URL: https://issues.apache.org/jira/browse/NIFI-7592
>             Project: Apache NiFi
>          Issue Type: Improvement
>          Components: Core Framework
>            Reporter: Matt Burgess
>            Assignee: Matt Burgess
>            Priority: Major
>
> In conjunction with MINIFI-422 (bringing MiNiFi into the NiFi codebase), it would be necessary to allow a NiFi build to run without having the GUI and REST API components required. For normal NiFi releases, the GUI would be included in the assembly, but this Jira proposes to reorganize and refactor the framework code to allow NiFi to run flows and such without requiring the web bundle.



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