What difficulties did you encounter when working with Spring Boot, and how did you solve them?

When working with Spring Boot, the following common issues and their solutions often arise:

1. Auto-configuration problems: Sometimes Spring Boot automatically configures components that are unnecessary or conflict with your settings.

   • Solution: Use the @SpringBootApplication(exclude = {...}) annotation to exclude unwanted auto-configurations or configure properties in application.properties.

2. Dependency conflicts: Version conflicts of libraries can lead to errors.

   • Solution: Use mvn dependency:tree or gradle dependencies for analysis, explicitly specify dependency versions.

3. Application startup errors: For example, the port is already in use or incorrect settings.

   • Solution: Check logs, change the port via application.properties (server.port=8081), use profiles for different environments.

4. Database and migration issues: Incorrect DataSource configuration or migrations.

   • Solution: Check connection settings, use Flyway or Liquibase for migrations.

5. Testing difficulties: The Spring context may load slowly or incorrectly.

   • Solution: Use annotations like @MockBean, @WebMvcTest for isolated testing.

Each of these problems is solved through studying logs, documentation, and configuring Spring Boot settings.