Spring Bean Lifecycle using XML Configuration

This project demonstrates the complete Spring Bean Lifecycle using Spring Core and XML-based configuration.

It shows how Spring creates, initializes, manages, and destroys beans inside the IoC Container.

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📚 Concepts Covered

• Spring IoC Container
• Bean Creation
• Dependency Injection (Setter Injection)
• XML Bean Configuration
• Bean References (ref)
• Bean Properties (property)
• Custom Initialization Method
• Custom Destruction Method
• Bean Lifecycle
• Maven Project Structure

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🛠 Technologies Used

• Java
• Spring Framework (Core)
• Maven
• XML Configuration
• Eclipse IDE

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📁 Project Structure

src
├── main
│   ├── java
│   │   └── example
│   │       └── message_converters_withlifecycle
│   │            ├── App.java
│   │            ├── MessageConverter.java
│   │            ├── IMessageConverter.java
│   │            ├── HtmlMessageConverter.java
│   │            └── PDFMessageConverter.java
│   │
│   └── resources
│       └── com
│           └── configuration
│               └── application-context.xml

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⚙️ Bean Configuration

The project configures beans using application-context.xml.

<bean id="msgConverter"
      class="example.message_converters_withlifecycle.MessageConverter"
      init-method="init"
      destroy-method="destroy">

    <property name="converter" ref="html"/>
    <property name="message" value="Hello guys"/>

</bean>

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🔄 Bean Lifecycle Flow

Container Starts
        │
        ▼
Bean Instantiation
        │
        ▼
Dependency Injection
        │
        ▼
init() Method
        │
        ▼
Bean Ready to Use
        │
        ▼
Application Running
        │
        ▼
Context Closed
        │
        ▼
destroy() Method

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▶️ Sample Output

Message Converter object created
Init method called
MessageConverter [converter=example.message_converters_withlifecycle.HtmlMessageConverter@..., message=Hello guys]
Destruction method called

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🚀 How to Run

1. Clone the repository

git clone <repository-url>

2. Open the project in Eclipse or IntelliJ IDEA.

3. Update Maven dependencies.

4. Run:

App.java

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📖 What You Will Learn

• How Spring creates beans
• Bean lifecycle inside the IoC container
• XML-based bean configuration
• Setter Dependency Injection
• Bean references using ref
• Custom initialization and destruction callbacks
• Proper closing of ApplicationContext

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📌 Future Improvements

• BeanPostProcessor
• InitializingBean
• DisposableBean
• @PostConstruct
• @PreDestroy
• Annotation-based configuration
• Java Config
• Prototype Bean Lifecycle
• Bean Scopes

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👨‍💻 Author

Prakhar Panchal

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