@PutMapping

HTTP PUT Handler

Shortcut for `@RequestMapping(method = RequestMethod.PUT)`.

HTTP PUT Request Handler:

@PutMapping maps HTTP PUT requests for complete resource updates or replacements.

• Full Resource Replacement: Replaces the entire resource state with the newly provided request payload.
• Idempotency: Submitting the exact same PUT payload multiple times produces the identical server state.

Production Code Example:

package com.anujsingh.digitalguru.controller;

import org.springframework.web.bind.annotation.*;

@RestController
public class UserController {
    @PutMapping("/users/{id}")
    public String updateUser(@PathVariable Long id) { return "User replaced"; }
}

Key Architectural Concepts & Best Practices:

When working with @PutMapping 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 @PutMapping ensures that your Java & Spring Boot backend microservices remain maintainable, secure, and compliant with modern enterprise software engineering standards.