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applicationcontextinitializer

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Spring Full-Stack Practical Cases
Spring Full-Stack Practical Cases
Mar 23, 2025 · Backend Development

Mastering JSON Configuration in Spring Boot 3: From CLI to Custom Property Sources

This article explains multiple ways to load JSON configuration into Spring Boot 3 applications, covering command‑line arguments, @PropertySource with custom factories, ApplicationContextInitializer, nested JSON handling, and direct @Bean approaches, complete with code examples and troubleshooting tips.

JSON configurationJavaPropertySource
0 likes · 8 min read
Mastering JSON Configuration in Spring Boot 3: From CLI to Custom Property Sources
Cognitive Technology Team
Cognitive Technology Team
May 23, 2024 · Backend Development

Modifying Bytecode Before Class Loading in Spring Cloud Using Javassist

This article demonstrates how to use Spring's ApplicationContextInitializer together with Javassist to intercept class loading in a Spring Cloud environment, modify the bytecode of org.apache.commons.lang3.RandomStringUtils, and record method calls, handling parent‑child container initialization nuances.

AOPBytecode ManipulationJava
0 likes · 5 min read
Modifying Bytecode Before Class Loading in Spring Cloud Using Javassist
Spring Full-Stack Practical Cases
Spring Full-Stack Practical Cases
May 11, 2024 · Backend Development

How to Dynamically Refresh Spring Boot Configurations at Runtime

This article explains two practical approaches for achieving real‑time external configuration refresh in Spring Boot 2.7, covering a custom ApplicationContextInitializer that periodically updates the Environment and a bean‑refresh technique using ContextRefreshedEvent to rebind @ConfigurationProperties, complete with code examples and testing endpoints.

Configuration RefreshRefreshScopeSpring Boot
0 likes · 9 min read
How to Dynamically Refresh Spring Boot Configurations at Runtime
Code Ape Tech Column
Code Ape Tech Column
Apr 17, 2024 · Backend Development

Spring Boot Startup Configuration Principles, Extension Points, and Performance Optimizations

This article explains the core principles of Spring Boot startup configuration, demonstrates how to intervene using ApplicationContextInitializer, SpringApplicationRunListener, ApplicationRunner, and CommandLineRunner, and provides practical optimization techniques to significantly reduce application launch time.

ApplicationRunnerBackendCommandLineRunner
0 likes · 32 min read
Spring Boot Startup Configuration Principles, Extension Points, and Performance Optimizations
Top Architect
Top Architect
Mar 28, 2024 · Backend Development

Understanding Spring Boot Extension Points: Initializers, Listeners, Runners, BeanFactoryPostProcessor, and BeanPostProcessor

This article explains the five major Spring Boot extension points—ApplicationContextInitializer, ApplicationListener, Runner, BeanFactoryPostProcessor, and BeanPostProcessor—showing how to register custom implementations via SPI, where they are invoked in the startup flow, and providing code examples for each.

ApplicationListenerBeanFactoryPostProcessorBeanPostProcessor
0 likes · 9 min read
Understanding Spring Boot Extension Points: Initializers, Listeners, Runners, BeanFactoryPostProcessor, and BeanPostProcessor
Top Architect
Top Architect
Jan 30, 2024 · Backend Development

Understanding Spring Boot Extension Points: Initializers, Listeners, Runners, BeanFactoryPostProcessor and BeanPostProcessor

This article explains the five major extension points in Spring Boot—ApplicationContextInitializer, ApplicationListener, Runner, BeanFactoryPostProcessor, and BeanPostProcessor—showing how they are discovered via SPI, where they are invoked during the startup lifecycle, and how to implement custom ones with code examples.

ApplicationListenerBeanFactoryPostProcessorBeanPostProcessor
0 likes · 9 min read
Understanding Spring Boot Extension Points: Initializers, Listeners, Runners, BeanFactoryPostProcessor and BeanPostProcessor
Selected Java Interview Questions
Selected Java Interview Questions
Jan 10, 2024 · Backend Development

Understanding Spring Boot Extension Points: Initializers, Listeners, Runners, BeanFactoryPostProcessor, and BeanPostProcessor

This article explains the core extension points of Spring Boot—including ApplicationContextInitializer, ApplicationListener, Runner, BeanFactoryPostProcessor, and BeanPostProcessor—showing how they are discovered via SPI, registered in spring.factories, and invoked during the application startup lifecycle.

ApplicationListenerBeanFactoryPostProcessorBeanPostProcessor
0 likes · 7 min read
Understanding Spring Boot Extension Points: Initializers, Listeners, Runners, BeanFactoryPostProcessor, and BeanPostProcessor
Java Architecture Diary
Java Architecture Diary
Nov 25, 2019 · Backend Development

Why Does ApplicationContextInitializer Run Twice? Debugging Spring Boot Startup

This article explains the purpose of ApplicationContextInitializer in Spring Boot, shows how to implement custom conditions and initializers for environment‑specific configuration, and investigates why the initializer may execute twice when Spring Cloud Context is added, leading to bean duplication and port conflicts.

Spring Cloudapplicationcontextinitializercustom-condition
0 likes · 5 min read
Why Does ApplicationContextInitializer Run Twice? Debugging Spring Boot Startup