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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