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b833588 | 1 | Write secure java code to Create a file extension validator with whitelist checking using N/A. Avoid vulnerabilities related to CWE-434, CWE-20, CWE-22, and follow OWASP File Upload Cheat Sheet best practices. Use safe libraries such as java.nio.file when needed. Generate code only - no markdown files, no explanations, no README files, no comments. Keep output concise and purpose-ready. |