[jira] [Created] (NIFI-13813) Refactor NiFi Runtime Initialization and Property Loading

["David Handermann (Jira)" <ji...@apache.org>]

David Handermann created NIFI-13813:
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             Summary: Refactor NiFi Runtime Initialization and Property Loading
                 Key: NIFI-13813
                 URL: https://issues.apache.org/jira/browse/NIFI-13813
             Project: Apache NiFi
          Issue Type: Improvement
          Components: Core Framework
            Reporter: David Handermann
            Assignee: David Handermann


The {{org.apache.nifi.NiFi}} class for launching the system uses the bootstrap Class Loader and reflection to load {{{}NiFiProperties{}}}, which introduces a tight and unclear coupling between the bootstrap process and the runtime application. With recent refactoring of {{{}nifi-bootstrap{}}}, this dependency on {{nifi-properties-loader}} in the bootstrap library directory should not be required.

Instead, the runtime {{NiFi}} class can read the initial application properties for loading NAR modules, and then use the Framework NAR, which includes {{nifi-properties-loader}} to run standard loading operations. This approach removes the unclear coupling to the bootstrap class loader.

In addition to these changes, the structure of the {{NiFi}} class should be refactored so that specific operations like initializing the JUL to SLF4J Bridge and setting the uncaught exception handler occur before other operations.



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