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https://github.com/codecshekhar/spring-boot-application-runner-example
This repository contains spring-boot-application-runner concepts to illustrate its advantages
https://github.com/codecshekhar/spring-boot-application-runner-example
application runner spring-boot
Last synced: 23 days ago
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This repository contains spring-boot-application-runner concepts to illustrate its advantages
- Host: GitHub
- URL: https://github.com/codecshekhar/spring-boot-application-runner-example
- Owner: CodeCshekhar
- Created: 2024-09-13T15:50:33.000Z (about 2 months ago)
- Default Branch: master
- Last Pushed: 2024-09-13T15:56:10.000Z (about 2 months ago)
- Last Synced: 2024-10-14T20:40:41.054Z (24 days ago)
- Topics: application, runner, spring-boot
- Language: Java
- Homepage:
- Size: 5.86 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# Spring Boot Application Runner
## Overview
Spring Boot Application Runner is a feature that allows you to execute code after the Spring ApplicationContext has been initialized. It's particularly useful for running specific tasks or initializing components when your application starts up.
## Features
- **Post-Initialization Execution**: Run code after Spring Boot has fully started.
- **Multiple Runners**: Define and use multiple Application Runners in a single application.
- **Ordering**: Control the execution order of multiple runners.
- **Dependency Injection**: Utilize Spring's dependency injection in your runners.
- **Exception Handling**: Proper exception handling during application startup.
- **Conditional Execution**: Use Spring's conditional annotations to control when runners execute.
## Getting Started
1. **Add Dependency**
Ensure you have the Spring Boot starter in your `pom.xml`:
```xml
org.springframework.boot
spring-boot-starter
```
2. **Create an Application Runner**
Implement the `ApplicationRunner` interface:
```java
import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.stereotype.Component;
@Component
public class MyApplicationRunner implements ApplicationRunner {
@Override
public void run(ApplicationArguments args) throws Exception {
System.out.println("This will be executed after the application starts");
}
}
```
3. **Run Your Application**
Start your Spring Boot application as usual. The `run` method of your Application Runner will be executed automatically.
## Configuration
You can configure multiple Application Runners and control their order:
```java
@Component
@Order(1)
public class FirstRunner implements ApplicationRunner {
// Implementation
}
@Component
@Order(2)
public class SecondRunner implements ApplicationRunner {
// Implementation
}
```
## Usage Examples
1. **Database Initialization**
```java
@Component
public class DatabaseInitializer implements ApplicationRunner {
@Autowired
private DataSource dataSource;
@Override
public void run(ApplicationArguments args) throws Exception {
// Initialize database schema or load initial data
}
}
```
2. **Cache Warming**
```java
@Component
public class CacheWarmer implements ApplicationRunner {
@Autowired
private CacheManager cacheManager;
@Override
public void run(ApplicationArguments args) throws Exception {
// Pre-load data into cache
}
}
```
## Best Practices
1. Keep Application Runner logic concise and focused.
2. Use dependency injection to access other Spring beans.
3. Handle exceptions properly to ensure clean application startup.
4. Use `@Order` annotation to control execution order when necessary.
5. Consider using `@Conditional` annotations for environment-specific runners.
## Documentation
For more detailed information, refer to the official Spring Boot documentation:
- [Spring Boot Application Runner](https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#boot-features-command-line-runner)
## Support
If you encounter issues or have questions:
1. Check the [Spring Boot documentation](https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/)
2. Visit the [Spring Community Forums](https://community.spring.io/)
3. Report issues on the [Spring Boot GitHub repository](https://github.com/spring-projects/spring-boot/issues)
## Contributing
Contributions to Spring Boot are welcome! Please refer to the [Spring Boot Contributing Guide](https://github.com/spring-projects/spring-boot/blob/main/CONTRIBUTING.adoc) for more information.
## License
Spring Boot is open source software released under the [Apache 2.0 license](https://www.apache.org/licenses/LICENSE-2.0).