# Compare Pjf

> Compare dprint-plugin-java output against spotless:palantir-java-format on a Java project. Builds the WASM plugin, formats with both tools, normalizes imports, and reports match rate with categorized diffs.

- Skill: `speakeasy-api/compare-pjf` (Agent Skill, multi-file: 3 files)
- Install (CLI): `npx skillmds@latest add speakeasy-api/compare-pjf`
- Raw SKILL.md: https://api.skillmd.com/api/skills/speakeasy-api/compare-pjf/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: speakeasy-api (https://skillmd.com/u/speakeasy-api)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/speakeasy-api/compare-pjf

---


# Compare dprint-plugin-java vs spotless:PJF

Compare the output of dprint-plugin-java against spotless:palantir-java-format on a real Java project to measure formatting parity.

## Usage

```bash
# Via mise task runner:
mise run compare-pjf /path/to/java/project

# Directly:
bash skills/compare-pjf/scripts/compare.sh /path/to/java/project
```

If no project path is given, a usage message is printed.

## What it does

1. **Builds** the WASM plugin (`cargo build --release --target wasm32-unknown-unknown --features wasm`)
2. **Copies** `.java` files from the target project (excluding `build/` and `.gradle/` dirs)
3. **Formats with dprint** using the freshly-built WASM plugin
4. **Formats with spotless:PJF** using a temporary Gradle wrapper project
5. **Normalizes** both outputs (strips `java.lang.*` imports, sorts imports, strips trailing whitespace)
6. **Compares** and reports match rate with unified diffs for mismatches

## Requirements

- Rust stable toolchain with `wasm32-unknown-unknown` target
- `dprint` CLI installed
- Java 21 (auto-detected via `mise where java@21` or `$JAVA_HOME`)
- `python3`
- A Gradle wrapper (`gradlew` + `gradle/`) — the script copies one from the target project if available

## Output

```
=== PJF Comparison Results ===
Total files: 473
Matching:    471 (99.6%)
Differing:   2

Diff details for mismatching files are printed below.
```

## Key notes

- Always compare from **fresh source files**, not re-formatted output. Re-formatting inflates match rates.
- Normalization removes `java.lang.*` imports (PJF strips these; our formatter intentionally keeps them) and sorts import blocks alphabetically.
- Current baseline on `sdk-javav2` (473 files): **99.6% match rate**.