124 Java Secure Coding
Use when you need to apply Java secure coding best practices — including validating untrusted inputs, defending against injection attacks with parameterized queries, minimizing attack surface via least privilege, applying strong cryptographic algorithms, handling exceptions securely without exposing sensitive data, managing secrets at runtime, avoiding unsafe deserialization, and encoding output…
Install
$ agentstack add skill-jabrena-cursor-rules-java-124-java-secure-coding ✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.
Security review
✓ PassedNo issues found. Passed automated security review. · v0.1.0 How review works →
- ✓ Prompt-injection patterns
- ✓ Secret / credential exfiltration
- ✓ Dangerous shell & filesystem operations
- ✓ Untrusted network calls
- ✓ Known-malicious package signatures
What it can access
- ✓ Network access No
- ✓ Filesystem access No
- ✓ Shell / process execution No
- ✓ Environment & secrets No
- ✓ Dynamic code execution No
From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.
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Passed review? Show it. Paste this badge into your README, it links to the public security report.
Links to your public security report.[](https://agentstack.voostack.com/security/report/skill-jabrena-cursor-rules-java-124-java-secure-coding) Reliability & compatibility
Declared compatibility
Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.
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Java Secure coding guidelines
Identify and apply Java secure coding practices to reduce vulnerabilities, protect sensitive data, and harden application behaviour against common attack vectors.
What is covered in this Skill?
- Input validation: type, length, format, and range checks
- SQL/OS/LDAP injection defence via
PreparedStatementand parameterized APIs - Attack surface minimisation: least-privilege permissions, removal of unused features
- Strong cryptography: BCrypt/Argon2 for passwords, AES-GCM for encryption, digital signatures; avoid deprecated ciphers (MD5, SHA-1, DES)
- Secure exception handling: log diagnostic details internally, expose only generic messages to clients
- Secrets management: load credentials from environment variables or secret managers — never hardcoded
- Safe deserialization: strict allow-lists, prefer explicit DTOs over native Java serialization
- Output encoding to prevent XSS in rendered content
Scope: The reference is organized by examples (good/bad code patterns) for each core area. Apply recommendations based on applicable examples.
Constraints
Before applying any secure coding changes, ensure the project compiles. If compilation fails, stop immediately — do not proceed until resolved. After applying improvements, run full verification.
- MANDATORY: Run
./mvnw compileormvn compilebefore applying any changes - SAFETY: If compilation fails, stop immediately — do not proceed until the project is in a valid state
- VERIFY: Run
./mvnw clean verifyormvn clean verifyafter applying improvements - BEFORE APPLYING: Read the reference for detailed good/bad examples, constraints, and safeguards for each secure coding pattern
When to use this skill
- Review Java code for secure coding
Workflow
- Compile project before secure-coding changes
Run ./mvnw compile or mvn compile and stop immediately if compilation fails.
- Read secure-coding reference and assess risks
Read references/124-java-secure-coding.md and identify applicable vulnerabilities and hardening opportunities.
- Apply secure-coding improvements
Implement selected protections for input validation, crypto, secrets, deserialization, and output encoding.
- Verify with full build
Run ./mvnw clean verify or mvn clean verify after applying improvements.
Reference
For detailed guidance, examples, and constraints, see [references/124-java-secure-coding.md](references/124-java-secure-coding.md).
Source & license
This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.
- Author: jabrena
- Source: jabrena/cursor-rules-java
- License: Apache-2.0
- Homepage: https://jabrena.github.io/cursor-rules-java/
Install and usage instructions live in the source repository linked above.
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Versions
- v0.1.0 Imported from the upstream source.