Embedded Apache Tomcat

Embedded Server Architecture

Spring Boot includes embedded Apache Tomcat inside `spring-boot-starter-web`. Your application executes via `public static void main()` without installing external server software.

Key Server Configuration:

• `server.port=8080`: Custom HTTP port.
• `server.tomcat.threads.max=200`: Max worker request threads.
• `server.tomcat.connection-timeout=20000`: Connection timeout in ms.

Production Code Example:

server:
  port: 8080
  tomcat:
    threads:
      max: 200
      min-spare: 10
    accept-count: 100

Key Architectural Concepts & Best Practices:

When working with Embedded Apache Tomcat in enterprise Spring Boot applications, keep these key architectural guidelines in mind:

• Separation of Concerns: Maintain a strict boundary between HTTP endpoints, service logic, and database persistence layers.
• Framework Conventions: Rely on Spring Boot auto-configuration defaults whenever possible, overriding settings only via application.yml or @Configuration classes when customized behavior is required.
• Production Monitoring & Reliability: Ensure proper exception handling, thread-safety, and resource cleanup to prevent memory leaks and unexpected runtime downtime.
• Developer Ergonomics: Write clean, self-documenting code with modern Java features (Records, Lambdas, Streams) to simplify code reviews and maintenance.

Summary Takeaway:

Mastering Embedded Apache Tomcat ensures that your Java & Spring Boot backend microservices remain maintainable, secure, and compliant with modern enterprise software engineering standards.