[jira] [Created] (ZEPPELIN-6263) Refactor ZeppelinServer to modularize startZeppelin() for improved maintainability

[Gyeongtae Park (Jira)]

Gyeongtae Park created ZEPPELIN-6263:
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             Summary: Refactor ZeppelinServer to modularize startZeppelin() for 
improved maintainability
                 Key: ZEPPELIN-6263
                 URL: https://issues.apache.org/jira/browse/ZEPPELIN-6263
             Project: Zeppelin
          Issue Type: Improvement
            Reporter: Gyeongtae Park
            Assignee: Gyeongtae Park
             Fix For: 1.0.0, 0.12.1, 0.13.0


The current {{startZeppelin()}} method in {{ZeppelinServer}} contains a large 
block of procedural logic that handles initialization, configuration, and 
startup processes in a monolithic way. This makes the method hard to read, 
maintain, and test.

This issue proposes to refactor {{startZeppelin()}} by extracting its core 
responsibilities into clearly named private helper methods, each focusing on a 
specific task (e.g., initializing metrics, setting up Jetty handlers, binding 
services, configuring UI, etc.)
h4. Proposed Changes
 * Extract responsibilities into the following private methods:

 ** {{initMetrics()}}

 ** {{initJettyHandler()}}

 ** {{initServiceLocator()}}

 ** {{bindZeppelinServices()}}

 ** {{setupWebUiContexts(...)}}

 ** {{initNotebookRepo()}}

 ** {{initJMX()}}

 ** {{runStartupNote()}}

 ** {{registerShutdownHook()}}

 ** {{eagerLoadCoreServices()}}

 ** {{initializeAndRecoverNotebook()}}

 ** {{startJettyServer()}}

 ** {{checkServiceLocatorErrors(...)}}

 ** {{waitForJettyTermination()}}

h4. Benefits
 * Improved readability and structure

 * Easier to test and debug individual components

 * Better adherence to the Single Responsibility Principle



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