Java Journey

Dev9

Module 9: Security in Backend Systems (Java)

This module introduces best practices for securing backend systems, preventing vulnerabilities, and safeguarding user data.

9.1 Learning Objectives

  • Identify and mitigate common web vulnerabilities (SQL injection, XSS, CSRF).
  • Implement input validation and sanitization.
  • Encrypt sensitive data and secure API endpoints.

9.2 SQL Injection Prevention


String query = "SELECT * FROM users WHERE username = ?";
PreparedStatement stmt = connection.prepareStatement(query);
stmt.setString(1, username);
ResultSet rs = stmt.executeQuery();

9.3 Input Validation Example


@PostMapping("/register")
public ResponseEntity<String> registerUser(@Valid @RequestBody User user) {
    return ResponseEntity.ok("User registered successfully");
}

9.4 Exercise

  • Harden your API by implementing validation and encryption.
  • Enable HTTPS on your local Spring Boot server.

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