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Java 8 compatibility rules for NeqSim. An agent skill from equinor/neqsim.
Install Neqsim Java8 Rules
$ npx skills add equinor/neqsim --skill neqsim-java8-rules -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install equinor/neqsim neqsim-java8-rules --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/equinor/neqsim.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.github/skills/neqsim-java8-rules .claude/skills/neqsim-java8-rules && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "neqsim-java8-rules" agent skill from https://github.com/equinor/neqsim/tree/master/.github/skills/neqsim-java8-rules into .claude/skills/neqsim-java8-rules/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "neqsim-java8-rules", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/equinor/neqsim/tree/master/.github/skills/neqsim-java8-rulesType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add equinor/neqsim --skill neqsim-java8-rules -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install equinor/neqsim neqsim-java8-rules --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/equinor/neqsim.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.github/skills/neqsim-java8-rules .agents/skills/neqsim-java8-rules && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "neqsim-java8-rules" agent skill from https://github.com/equinor/neqsim/tree/master/.github/skills/neqsim-java8-rules into .agents/skills/neqsim-java8-rules/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "neqsim-java8-rules", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add equinor/neqsim --skill neqsim-java8-rules -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install equinor/neqsim neqsim-java8-rules --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/equinor/neqsim.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.github/skills/neqsim-java8-rules .cursor/skills/neqsim-java8-rules && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "neqsim-java8-rules" agent skill from https://github.com/equinor/neqsim/tree/master/.github/skills/neqsim-java8-rules into .cursor/skills/neqsim-java8-rules/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "neqsim-java8-rules", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/equinor/neqsim.git --path .github/skills/neqsim-java8-rules--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add equinor/neqsim --skill neqsim-java8-rules -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install equinor/neqsim neqsim-java8-rules --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/equinor/neqsim.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.github/skills/neqsim-java8-rules .gemini/skills/neqsim-java8-rules && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "neqsim-java8-rules" agent skill from https://github.com/equinor/neqsim/tree/master/.github/skills/neqsim-java8-rules into .gemini/skills/neqsim-java8-rules/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "neqsim-java8-rules", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install equinor/neqsim neqsim-java8-rulesInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add equinor/neqsim --skill neqsim-java8-rules -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/equinor/neqsim.git skills-src && mkdir -p .github/skills && cp -r skills-src/.github/skills/neqsim-java8-rules .github/skills/neqsim-java8-rules && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "neqsim-java8-rules" agent skill from https://github.com/equinor/neqsim/tree/master/.github/skills/neqsim-java8-rules into .github/skills/neqsim-java8-rules/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "neqsim-java8-rules", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add equinor/neqsim --skill neqsim-java8-rules -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install equinor/neqsim neqsim-java8-rules --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/equinor/neqsim.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.github/skills/neqsim-java8-rules .opencode/skills/neqsim-java8-rules && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "neqsim-java8-rules" agent skill from https://github.com/equinor/neqsim/tree/master/.github/skills/neqsim-java8-rules into .opencode/skills/neqsim-java8-rules/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "neqsim-java8-rules", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
neqsim-java8-rules- GitHub stars
- 156
- Token cost
- ~1.3k tokens
- SKILL.md length
- 408 words
- Files
- 1
- Skills in repo
- 66
- Repo updated
- First seen
- Licence
- Apache-2.0
At a glance
Java 8 compatibility rules for NeqSim. An agent skill from equinor/neqsim.
- Works in 4 steps: Search for the class:… → Read constructor and method signatures… → Use only methods that actually exist… → …
- Reviewing any Java code for NeqSim
- SKILL.md covers Forbidden Java 9+ Features, Common var Replacements, Required Import for String… and Code Formatting (Spotless) —…, plus 4 more sections
- Calls git
What it does
Neqsim Java8 Rules is an agent skill from equinor/neqsim. Java 8 compatibility rules for NeqSim. USE WHEN: writing or reviewing any Java code for NeqSim, including tests. Covers forbidden Java 9+ features, replacement patterns, API verification, and JavaDoc requirements. All NeqSim Java code MUST compile with Java 8.
Its SKILL.md is about 1.3k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Development. It works with Java. The repository describes itself as: NeqSim is a library for calculation of fluid behavior, phase equilibrium and process simulation. The licence is Apache-2.0.
When your agent uses it
- Reviewing any Java code for NeqSim
- Including tests
Example prompts
- “/neqsim-java8-rules”
Workflow steps
4 steps, taken from the first numbered list in SKILL.md.
- Search for the class: file_search("**/ClassName.java")
- Read constructor and method signatures from the actual source
- Use only methods that actually exist with correct parameter types
- Do NOT assume convenience overloads — check first
What it can do on your machine
Read from SKILL.md and the folder at commit 92261e0. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
git
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use git, which can reach the network depending on how they are called.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Neqsim Java8 Rules loads about 1.3k tokens when it runs. Until then it costs about 70 tokens; SKILL.md has 408 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from equinor/neqsim at commit 92261e0, republished under its Apache-2.0 licence (© equinor). 408 words, ~1,285 tokens.
Download SKILL.mdSave it as
.claude/skills/neqsim-java8-rules/SKILL.md (or your agent's skills folder).- name
- neqsim-java8-rules
- description
- Java 8 compatibility rules for NeqSim. USE WHEN: writing or reviewing any Java code for NeqSim, including tests. Covers forbidden Java 9+ features, replacement patterns, API verification, and JavaDoc requirements. All NeqSim Java code MUST compile with Java 8.
- last_verified
- 2026-07-04
Java 8 Compatibility Rules for NeqSim
All NeqSim Java code — including test classes in src/test/java/ — MUST compile with Java 8. The CI build will FAIL if you use Java 9+ features.
Forbidden Java 9+ Features
| Forbidden | Java 8 Alternative |
|---|---|
var x = ... | Explicit type: String x = ..., Map<String, Object> map = ... |
List.of(a, b) | Arrays.asList(a, b) or Collections.singletonList(a) |
Set.of(a, b) | new HashSet<>(Arrays.asList(a, b)) |
Map.of(k, v) | Collections.singletonMap(k, v) or new HashMap<>() |
"str".repeat(n) | StringUtils.repeat("str", n) (Apache Commons) |
str.isBlank() | str.trim().isEmpty() |
str.strip() | str.trim() |
str.lines() | str.split("\\R") or BufferedReader |
Optional.isEmpty() | !optional.isPresent() |
Text blocks """...""" | Regular strings with \n |
| Records | Regular class with fields, constructor, getters |
Pattern matching instanceof | Traditional instanceof + cast |
Stream.toList() | .collect(Collectors.toList()) |
Common var Replacements
// WRONG (Java 10+):
var map = someMethod.toMap();
var list = getItems();
var result = calculate();
// CORRECT (Java 8):
Map<String, Object> map = someMethod.toMap();
List<String> list = getItems();
CalculationResult result = calculate();Required Import for String Repeat
import org.apache.commons.lang3.StringUtils;
// Usage: StringUtils.repeat("=", 70)Code Formatting (Spotless) — MANDATORY
AI-generated Java is NOT auto-formatted. After creating or editing ANY .java
file, reformat it before committing — do not rely on local pre-commit hooks
being installed:
./mvnw spotless:apply # reformats Java to the project style (Eclipse profile)
./mvnw spotless:check # verifies formatting — this is what CI runs- Formatter profile:
.config/neqsim_formatter.xml(configured inpom.xml), applied tosrc/main/javaandsrc/test/java. - CI runs
./mvnw spotless:checkand FAILS the build on any unformatted file. - Run
spotless:apply, thengit addthe reformatted files, then commit. - NEVER bypass the gate with
git commit --no-verify.
API Verification (MANDATORY)
Before using any NeqSim class in code or examples:
- Search for the class:
file_search("**/ClassName.java") - Read constructor and method signatures from the actual source
- Use only methods that actually exist with correct parameter types
- Do NOT assume convenience overloads — check first
Common API mistakes:
- Assuming
getXxx95()when actual isgetXxx(int percentile) - Assuming 1-arg constructors when 2+ args are required
- Calling methods on wrong class
- Assuming
calculate()when actual iscalculateRisk()orrun()
Show full SKILL.md (150 more words)Show less
JavaDoc Requirements
All classes and methods (public, protected, AND private) require complete JavaDoc:
- Class-level: description,
@author,@version - Method-level: description,
@paramfor every parameter,@returnfor non-void,@throwsfor each exception - HTML5 compatible: use
<caption>in tables (nosummaryattribute) - No
@seewith plain text — only valid Java references - No lambda arrows (
->) in JavaDoc code examples
Build Commands
./mvnw install # full build
./mvnw test -Dtest=ClassName # single test class
./mvnw test -Dtest=ClassName#methodName # single method
./mvnw checkstyle:check spotbugs:check pmd:check # static analysis
./mvnw javadoc:javadoc # verify JavaDocSerialization — SE_BAD_FIELD Rule (MANDATORY)
SpotBugs enforces that all instance fields in Serializable classes are either
serializable themselves or marked transient. This applies to any class extending
ProcessEquipmentBaseClass, MeasurementDeviceBaseClass, MechanicalDesign,
thermo phase classes, or any other Serializable class.
When to use transient
Mark a field transient when its type does NOT implement Serializable:
- Functional interfaces:
Function,BiConsumer,Consumer,Supplier - JDBC:
Connection,Statement,ResultSet - Threads:
Thread,ExecutorService - Apache Commons Math:
BicubicInterpolator,BicubicInterpolatingFunction,LinearInterpolator - Inner classes that don't implement
Serializable(e.g.,NetworkNode,GibbsComponent) - External library types not designed for serialization
Correct modifier order
// private fields
private transient MyType field;
private final transient List<NonSerializableInner> items = new ArrayList<>();
// package-private fields
transient SomeType field;Verify with SpotBugs
./mvnw spotbugs:check 2>&1 | Select-String "SE_BAD_FIELD" # should return empty© equinor, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in .github/skills/neqsim-java8-rules of equinor/neqsim.
Open the folder on GitHubat commit 92261e0
Compare with similar skills
Neqsim Java8 Rules next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Neqsim Java8 Rules this skillequinor/neqsim | 156 | — | ~1.3k | Automated safety check: Pass | Apache-2.0 | |
| Creating Description For Gh PRredis/jedis | 12k | — | ~838 | Automated safety check: Pass | MIT | |
| Code Review Skillawesome-skills/code-review-skill | 2.1k | — | ~2.8k | Automated safety check: Notes | MIT | |
| Caffeine Cache Optimization Experimentsben-manes/caffeine | 18k | — | ~2.6k | Automated safety check: Notes | Apache-2.0 | |
| Git History Bug Auditben-manes/caffeine | 18k | — | ~3.3k | Automated safety check: Pass | Apache-2.0 | |
| CI Act Runchewiebug/GCViewer | 4.6k | — | ~2.4k | Automated safety check: Notes | Custom licence |
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Related
Works with
Categories
Questions about Neqsim Java8 Rules
What does Neqsim Java8 Rules do?
Java 8 compatibility rules for NeqSim. An agent skill from equinor/neqsim. Neqsim Java8 Rules is an agent skill from equinor/neqsim. Java 8 compatibility rules for NeqSim.
When should I use Neqsim Java8 Rules?
Neqsim Java8 Rules fits situations like: reviewing any Java code for NeqSim; including tests.
How do I install Neqsim Java8 Rules in Claude Code?
Run `npx skills add equinor/neqsim --skill neqsim-java8-rules -a claude-code`. Or copy the skill folder (.github/skills/neqsim-java8-rules in equinor/neqsim) into .claude/skills/neqsim-java8-rules in your project. Claude Code loads it when a task matches its description.
How do I install Neqsim Java8 Rules in Codex?
Run `npx skills add equinor/neqsim --skill neqsim-java8-rules -a codex`. Or copy the skill folder (.github/skills/neqsim-java8-rules in equinor/neqsim) into .agents/skills/neqsim-java8-rules in your project. Codex loads it when a task matches its description.
Can I use Neqsim Java8 Rules in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add equinor/neqsim --skill neqsim-java8-rules -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/neqsim-java8-rules, .gemini/skills/neqsim-java8-rules, .github/skills/neqsim-java8-rules and .opencode/skills/neqsim-java8-rules in your project.
What does Neqsim Java8 Rules need to run?
Going by SKILL.md and its folder, Neqsim Java8 Rules needs the command-line tools its instructions call (git).
Does Neqsim Java8 Rules access the network?
SKILL.md contains no URLs. Its commands use git, which can reach the network depending on how they are called. This is read from the text; nothing was executed.
Is Neqsim Java8 Rules safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Neqsim Java8 Rules use?
Neqsim Java8 Rules is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Neqsim Java8 Rules use?
About 1.3k tokens (SKILL.md is roughly 5.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Neqsim Java8 Rules?
Skills that share tags, products or a category with Neqsim Java8 Rules: Creating Description For Gh PR (redis/jedis, 12k stars), Code Review Skill (awesome-skills/code-review-skill, 2.1k stars), Caffeine Cache Optimization Experiments (ben-manes/caffeine, 18k stars) and Git History Bug Audit (ben-manes/caffeine, 18k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Neqsim Java8 Rules?
equinor (a GitHub organization) maintains it in equinor/neqsim, which has 156 GitHub stars. The repository holds 66 skills in this directory. The repository was last updated on October 7, 2026.
Source: equinor/neqsim on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.