Java Architecture Review
decebals/claude-code-java
Reviews a Java project's architecture at the macro level: package structure, module boundaries, dependency direction and layering.
A skill your agent uses when modelling a rich domain in Java - SOLID principles, encapsulated entities that enforce their own invariants, and value objects over primitives
Install Java Oop Solid Design
$ npx skills add makifbaysal/tasktrooper --skill java-oop-solid-design -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install makifbaysal/tasktrooper java-oop-solid-design --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/makifbaysal/tasktrooper.git skills-src && mkdir -p .claude/skills && cp -r skills-src/catalog/agents/backend-developer/skills/java-oop-solid-design .claude/skills/java-oop-solid-design && 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 "java-oop-solid-design" agent skill from https://github.com/makifbaysal/tasktrooper/tree/main/catalog/agents/backend-developer/skills/java-oop-solid-design into .claude/skills/java-oop-solid-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "java-oop-solid-design", 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/makifbaysal/tasktrooper/tree/main/catalog/agents/backend-developer/skills/java-oop-solid-designType 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 makifbaysal/tasktrooper --skill java-oop-solid-design -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install makifbaysal/tasktrooper java-oop-solid-design --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/makifbaysal/tasktrooper.git skills-src && mkdir -p .agents/skills && cp -r skills-src/catalog/agents/backend-developer/skills/java-oop-solid-design .agents/skills/java-oop-solid-design && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "java-oop-solid-design" agent skill from https://github.com/makifbaysal/tasktrooper/tree/main/catalog/agents/backend-developer/skills/java-oop-solid-design into .agents/skills/java-oop-solid-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "java-oop-solid-design", 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 makifbaysal/tasktrooper --skill java-oop-solid-design -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install makifbaysal/tasktrooper java-oop-solid-design --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/makifbaysal/tasktrooper.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/catalog/agents/backend-developer/skills/java-oop-solid-design .cursor/skills/java-oop-solid-design && 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 "java-oop-solid-design" agent skill from https://github.com/makifbaysal/tasktrooper/tree/main/catalog/agents/backend-developer/skills/java-oop-solid-design into .cursor/skills/java-oop-solid-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "java-oop-solid-design", 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/makifbaysal/tasktrooper.git --path catalog/agents/backend-developer/skills/java-oop-solid-design--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 makifbaysal/tasktrooper --skill java-oop-solid-design -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install makifbaysal/tasktrooper java-oop-solid-design --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/makifbaysal/tasktrooper.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/catalog/agents/backend-developer/skills/java-oop-solid-design .gemini/skills/java-oop-solid-design && 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 "java-oop-solid-design" agent skill from https://github.com/makifbaysal/tasktrooper/tree/main/catalog/agents/backend-developer/skills/java-oop-solid-design into .gemini/skills/java-oop-solid-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "java-oop-solid-design", 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 makifbaysal/tasktrooper java-oop-solid-designInstalls 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 makifbaysal/tasktrooper --skill java-oop-solid-design -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/makifbaysal/tasktrooper.git skills-src && mkdir -p .github/skills && cp -r skills-src/catalog/agents/backend-developer/skills/java-oop-solid-design .github/skills/java-oop-solid-design && 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 "java-oop-solid-design" agent skill from https://github.com/makifbaysal/tasktrooper/tree/main/catalog/agents/backend-developer/skills/java-oop-solid-design into .github/skills/java-oop-solid-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "java-oop-solid-design", 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 makifbaysal/tasktrooper --skill java-oop-solid-design -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install makifbaysal/tasktrooper java-oop-solid-design --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/makifbaysal/tasktrooper.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/catalog/agents/backend-developer/skills/java-oop-solid-design .opencode/skills/java-oop-solid-design && 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 "java-oop-solid-design" agent skill from https://github.com/makifbaysal/tasktrooper/tree/main/catalog/agents/backend-developer/skills/java-oop-solid-design into .opencode/skills/java-oop-solid-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "java-oop-solid-design", 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
java-oop-solid-design- GitHub stars
- 109
- Token cost
- ~1k tokens
- SKILL.md length
- 408 words
- Files
- 1
- Skills in repo
- 99
- Repo updated
- First seen
- Licence
- Apache-2.0
At a glance
A skill your agent uses when modelling a rich domain in Java - SOLID principles, encapsulated entities that enforce their own invariants, and value objects over primitives
- Modelling a rich domain in Java - SOLID principles
- SKILL.md covers Overview, SOLID, concretely, Encapsulation over anemic models and Value objects over primitives, plus 3 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Encapsulated entities that enforce their own invariants
What it does
Java Oop Solid Design is an agent skill from makifbaysal/tasktrooper. Use when modelling a rich domain in Java - SOLID principles, encapsulated entities that enforce their own invariants, and value objects over primitives
Its SKILL.md is about 1k 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, covering Design patterns. It works with Java. The repository describes itself as: Local-first agent platform: board + role agents + agent CLI runs (Claude Code, Cursor, Antigravity, OpenCode) or local and API models (Ollama, LM Studio), all on your own Mac. The licence is Apache-2.0.
When your agent uses it
- Modelling a rich domain in Java - SOLID principles
- Encapsulated entities that enforce their own invariants
- Value objects over primitives
Example prompts
- “/java-oop-solid-design”
What it can do on your machine
Read from SKILL.md and the folder at commit f3d59b5. 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
No scripts in the folder and no shell commands in SKILL.md (its code samples are java).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
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
Java Oop Solid Design loads about 1k tokens when it runs. Until then it costs about 43 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 makifbaysal/tasktrooper at commit f3d59b5, republished under its Apache-2.0 licence (© makifbaysal). 408 words, ~1,014 tokens.
Download SKILL.mdSave it as
.claude/skills/java-oop-solid-design/SKILL.md (or your agent's skills folder).- name
- java-oop-solid-design
- description
- Use when modelling a rich domain in Java - SOLID principles, encapsulated entities that enforce their own invariants, and value objects over primitives
- category
- architecture
- tech_stack
- Java
Java OOP & SOLID Design
Overview
Java is chosen precisely when the domain is rich (see java-vs-go-decision). That value is only realized if you model it with real objects that protect their invariants — not anemic data bags with a pile of setters and logic scattered in services.
Core principle: Objects own their invariants. If a rule about an entity can be violated from outside the entity, the model is broken.
SOLID, concretely
- S — Single Responsibility: one reason to change per class. A class that parses HTTP, applies business rules, and writes SQL is three classes.
- O — Open/Closed: extend behavior via new types/strategies, not by editing a growing
switch. New payment method → newPaymentMethodimplementation, not anothercase. - L — Liskov: a subtype must honor the supertype's contract. If
Square extends RectanglebreakssetWidth, the hierarchy is wrong — prefer composition. - I — Interface Segregation: many small role interfaces over one fat one. A caller that needs
readshouldn't depend onwrite. - D — Dependency Inversion: services depend on interfaces (ports), not concrete adapters. Inject the interface via the constructor.
Encapsulation over anemic models
// ❌ anemic: invariant lives nowhere, anyone can break it
class Task {
public String title; // no bound enforced
public Status status;
}
task.title = "x".repeat(500); // invalid state, no guard
// ✅ rich: the entity enforces its own rules
public final class Task {
private final TaskId id;
private String title;
private Status status;
private Task(TaskId id, String title) { this.id = id; this.title = title; }
public static Task create(String title) {
if (title == null || title.isBlank() || title.length() > 200)
throw new InvalidTaskTitle(title);
return new Task(TaskId.newId(), title);
}
public void rename(String title) { /* same guard, reused */ }
public void complete() {
if (status == Status.DONE) throw new IllegalTransition("already done");
this.status = Status.DONE;
}
// getters, no public setters
}Value objects over primitives
Wrap meaningful primitives: TaskId, Email, Money — not raw String/long/BigDecimal. A TaskId can't be accidentally passed where a UserId is expected, and validation lives in one place. Java record makes these cheap.
Show full SKILL.md (195 more words)Show less
Prefer
recordfor immutable value objects and DTOs.sealedinterfaces + pattern matching for closed hierarchies (states, commands).- Immutability by default; expose behavior methods, not setters.
- Throw domain exceptions (
InvalidTaskTitle) mapped to HTTP status at the boundary — not rawIllegalArgumentExceptionleaking out.
Prefer a sealed interface + exhaustive switch pattern matching (final since Java 21) for a closed set of states or commands over a type enum plus if/instanceof chains — the compiler then refuses to let a new case go unhandled.
Common Mistakes
- Public setters that let callers build invalid state.
- Business rules in the service that should be on the entity.
String/longeverywhere instead of value objects.- A god-service with dozens of methods and no domain objects.
- Lombok
@Data/@EqualsAndHashCodeon a JPA entity — it pulls in lazy associations (forcing a load, or crashing outside the session) and generates a mutable, settable id that breaksequals/hashCodeonce the entity is persisted. Writeequals/hashCodeon the id only, or skip Lombok on entities.
Red Flags
- An entity with only getters/setters and no behavior.
- The same validation copy-pasted in two services → it belongs on the entity/value object.
- A
switchover a type enum that grows every feature → missing polymorphism.
© makifbaysal, 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 catalog/agents/backend-developer/skills/java-oop-solid-design of makifbaysal/tasktrooper.
Open the folder on GitHubat commit f3d59b5
Compare with similar skills
Java Oop Solid Design 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 |
|---|---|---|---|---|---|---|
| Java Oop Solid Design this skillmakifbaysal/tasktrooper | 109 | — | ~1k | Automated safety check: Pass | Apache-2.0 | |
| Java Architecture Reviewdecebals/claude-code-java | 750 | 1 repos | ~2.2k | Automated safety check: Pass | MIT | |
| Java Design Patterns Referencedecebals/claude-code-java | 750 | 1 repos | ~4.4k | Automated safety check: Pass | MIT | |
| Clean Code Principlesdecebals/claude-code-java | 750 | — | ~3.4k | Automated safety check: Pass | MIT | |
| Solid Principlesdecebals/claude-code-java | 750 | — | ~4.2k | Automated safety check: Pass | MIT | |
| Hexagonal Architecture Layers JavaGentleman-Programming/Gentleman-Skills | 657 | — | ~1k | Automated safety check: Pass | MIT |
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Related
Works with
Categories
Questions about Java Oop Solid Design
What does Java Oop Solid Design do?
A skill your agent uses when modelling a rich domain in Java - SOLID principles, encapsulated entities that enforce their own invariants, and value objects over primitives. Java Oop Solid Design is an agent skill from makifbaysal/tasktrooper.
When should I use Java Oop Solid Design?
Java Oop Solid Design fits situations like: modelling a rich domain in Java - SOLID principles; encapsulated entities that enforce their own invariants; value objects over primitives.
How do I install Java Oop Solid Design in Claude Code?
Run `npx skills add makifbaysal/tasktrooper --skill java-oop-solid-design -a claude-code`. Or copy the skill folder (catalog/agents/backend-developer/skills/java-oop-solid-design in makifbaysal/tasktrooper) into .claude/skills/java-oop-solid-design in your project. Claude Code loads it when a task matches its description.
How do I install Java Oop Solid Design in Codex?
Run `npx skills add makifbaysal/tasktrooper --skill java-oop-solid-design -a codex`. Or copy the skill folder (catalog/agents/backend-developer/skills/java-oop-solid-design in makifbaysal/tasktrooper) into .agents/skills/java-oop-solid-design in your project. Codex loads it when a task matches its description.
Can I use Java Oop Solid Design 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 makifbaysal/tasktrooper --skill java-oop-solid-design -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/java-oop-solid-design, .gemini/skills/java-oop-solid-design, .github/skills/java-oop-solid-design and .opencode/skills/java-oop-solid-design in your project.
What does Java Oop Solid Design need to run?
SKILL.md names no scripts, command-line tools or credentials: Java Oop Solid Design is instructions for the agent only.
Does Java Oop Solid Design access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Java Oop Solid Design 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 Java Oop Solid Design use?
Java Oop Solid Design 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 Java Oop Solid Design use?
About 1k tokens (SKILL.md is roughly 4.1k 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 Java Oop Solid Design?
Skills that share tags, products or a category with Java Oop Solid Design: Java Architecture Review (decebals/claude-code-java, 750 stars), Java Design Patterns Reference (decebals/claude-code-java, 750 stars), Clean Code Principles (decebals/claude-code-java, 750 stars) and Solid Principles (decebals/claude-code-java, 750 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Java Oop Solid Design?
makifbaysal (a GitHub user) maintains it in makifbaysal/tasktrooper, which has 109 GitHub stars. The repository holds 99 skills in this directory. The repository was last updated on October 6, 2026.
Source: makifbaysal/tasktrooper on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.