java-code-upgrade SKILL.md skillA
java-code-upgrade from darshitpp/java-code-upgrade is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add darshitpp/java-code-upgrade/java-code-upgrade@git:20260306.43c5eecPins git:20260306.43c5eec in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- darshitpp/java-code-upgrade
- Path
SKILL.md- Versions recorded
- 1
- Latest version
- git:20260306.43c5eec, committed Mar 6, 2026
- Size
- 6,985 bytes
- Repository stars
- 4
- License
- MIT
Upgrade Java code from older idioms to modern equivalents. Scans for legacy patterns (pre-Java 10 through Java 25) across language features, collections, strings, streams, concurrency, input/output, error handling, date/time, security, tooling, and enterprise APIs, then suggests modern replacements with before/after examples. Use when modernizing Java codebases, reviewing pull requests for outdated patterns, or migrating from Java EE to Jakarta EE. Do not use for non-Java languages, build tool…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Java Evolved — Code Upgrade Skill Modernize Java code by identifying legacy patterns and suggesting modern replacements with before/after examples sourced from 113 patterns across 11 categories (Java 7 through Java 25). ## Procedures **Step 1: Determine Upgrade Scope** 1. Identify the target JDK version for the project. Check `pom.xml`, `build.gradle`, or `.java-version` for the configured source/target level. If unspecified, ask the user. 2. Identify which categories are relevant to the task: - `language` — var, records, sealed classes, pattern matching, switch expressions, text blocks - `collections` — immutable factories, sequenced collections, unmodifiable collectors - `strings` — isBlank, strip, repeat, lines, formatted, text blocks - `streams` — toList, mapMulti, gatherers, takeWhile/dropWhile, optional improvements - `concurrency` — virtual threads, structured concurrency, scoped values, stable values - `io` — HTTP client, Files API, Path.of, transferTo, memory-mapped files - `errors` — helpful NPE, multi-catch, optional chaining, null-in-switch - `datetime` — java.time API, Duration/Period, HexFormat, Math.clamp …
Read the whole file at its exact version.
How to install
mdr add darshitpp/java-code-upgrade/java-code-upgrade@sha256:e51e59115958bb3aThe line at the top of this page pins the label git:20260306.43c5eec, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_kmmrpltrnpw2l36u)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Mar 6, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (6985 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
darshitpp/java-code-upgrade · 4 stars · license MIT · pushed 2026-09-18 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_kmmrpltrnpw2l36u GET https://markdownregistry.com/api/v1/resolve?ref=darshitpp/java-code-upgrade/java-code-upgrade GET https://markdownregistry.com/api/v1/blob/e51e59115958bb3a357fa9174e19fcb303a675f3a3a56f336489bfb496e56f05
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.