input-validation

To prevent XSS and SQL injection in Java, you validate, sanitize, and encode all user inputs using multi-layer validation, allowlist patterns, and parameterized queries. This approach enforces secure input handling across web forms and APIs.

Defense-in-depth input validation applies multi-layer checks across client, server, service, and database layers. By combining centralized HTML/JS encoding, allowlist-based patterns, and safe file handling, it prevents data corruption and unsafe rendering.

You create custom validators to enforce specific business rules, such as checking a Swedish Personal ID. These domain-specific checks integrate into the broader input sanitization flow to ensure only valid data enters your system.

To sanitize file uploads and prevent command injection, apply safe file upload validation alongside standard input sanitization. This ensures uploaded files are thoroughly checked before processing, defending against file-based threats.

OWASP compliance strongly recommends allowlist-based input validation to prevent injection attacks. Using strict allowlist patterns ensures only explicitly approved data formats are accepted, rejecting potentially malicious inputs before processing.

To wire an InputSanitizer into a Java service, install the component and run a quick validation flow against representative inputs. This allows you to observe sanitized outputs and verify that encoding and sanitization rules apply correctly.