java-code-upgrade skillA
java-code-upgrade is agent-read markdown (skill) from darshitpp/java-code-upgrade: 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 Use when modernizing Java codebases, reviewing pull requests for outdated patterns, or migrating from Java EE to Jakarta EE.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 c.
Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns 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@git:20260306.43c5eecmdr add darshitpp/java-code-upgrade/java-code-upgrade@sha256:e51e59115958bb3aPin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.
[](https://markdownregistry.com/a/art_kmmrpltrnpw2l36u)
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Versions
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
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