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How To Run Custom Code on Micronaut Start
- When building applications with Micronaut, running custom logic at startup is useful for tasks like initializing resources, validating configurations, or logging startup metrics.
- Two common methods for running startup code in Micronaut are by implementing ApplicationEventListener or using @EventListener annotation.
- ApplicationEventListener offers precise control over startup events, while @EventListener provides a more concise, annotation-based approach.
- Micronaut's lifecycle events enable tasks like initializing resources, pre-loading configuration, registering services, or performing health checks.
- Dependencies in the build.gradle file need to be verified and edited if necessary to ensure the project is properly configured for running startup code.
- Implementing a StartupListener class using ApplicationEventListener allows for listening to the ApplicationStartupEvent and executing custom startup logic.
- An alternate approach is to use an AnnotatedStartupListener class with @EventListener annotation to trigger custom logic during application startup.
- By creating the Main Application Class and Configuration File, you can establish the entry point and configure the application settings respectively.
- Running the Micronaut application can be done using the Gradle command ./gradlew run, triggering the startup messages to be displayed in the terminal.
- Micronaut provides powerful mechanisms for hooking into the application lifecycle, helping maintain a clean, modular, and reactive application architecture.
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