write-script-java
MUST use when writing Java scripts.
What this skill does
## CLI Commands
Place scripts in a folder.
After writing, tell the user which command fits what they want to do:
- `wmill script preview <script_path>` — **default when iterating on a local script.** Runs the local file without deploying.
- `wmill script run <path>` — runs the script **already deployed** in the workspace. Use only when the user explicitly wants to test the deployed version, not local edits.
- `wmill generate-metadata` — generate `.script.yaml` and `.lock` files for the script you modified.
- `wmill sync push` — deploy local changes to the workspace. Only suggest/run this when the user explicitly asks to deploy/publish/push — not when they say "run", "try", or "test".
### Preview vs run — choose by intent, not habit
If the user says "run the script", "try it", "test it", "does it work" while there are **local edits to the script file**, use `script preview`. Do NOT push the script to then `script run` it — pushing is a deploy, and deploying just to test overwrites the workspace version with untested changes.
Only use `script run` when:
- The user explicitly says "run the deployed version" / "run what's on the server".
- There is no local script being edited (you're just invoking an existing script).
Only use `sync push` when:
- The user explicitly asks to deploy, publish, push, or ship.
- The preview has already validated the change and the user wants it in the workspace.
### After writing — offer to test, don't wait passively
If the user hasn't already told you to run/test/preview the script, offer it as a one-sentence next step (e.g. "Want me to run `wmill script preview` with sample args?"). Do not present a multi-option menu.
If the user already asked to test/run/try the script in their original request, skip the offer and just execute `wmill script preview <path> -d '<args>'` directly — pick plausible args from the script's declared parameters. The shape varies by language: `main(...)` for code languages, the SQL dialect's own placeholder syntax (`$1` for PostgreSQL, `?` for MySQL/Snowflake, `@P1` for MSSQL, `@name` for BigQuery, etc.), positional `$1`, `$2`, … for Bash, `param(...)` for PowerShell.
`wmill script preview` does not deploy, but it still executes script code and may cause side effects; run it yourself when the user asked to test/preview (or after confirming that execution is intended). `wmill sync push` and `wmill generate-metadata` modify workspace state or local files — only run these when the user explicitly asks; otherwise tell them which to run.
For a **visual** open-the-script-in-the-dev-page preview (rather than `script preview`'s run-and-print-result), use the `preview` skill.
Use `wmill resource-type list --schema` to discover available resource types.
# Java
The script must contain a Main public class with a `public static main()` method:
```java
public class Main {
public static Object main(String name, int count) {
java.util.Map<String, Object> result = new java.util.HashMap<>();
result.put("name", name);
result.put("count", count);
return result;
}
}
```
**Important:**
- Class must be named `Main`
- Method must be `public static Object main(...)`
- Return type is `Object` or `void`
## Maven Dependencies
Add dependencies using comments at the top:
```java
//requirements:
//com.google.code.gson:gson:2.10.1
//org.apache.httpcomponents:httpclient:4.5.14
import com.google.gson.Gson;
public class Main {
public static Object main(String input) {
Gson gson = new Gson();
return gson.fromJson(input, Object.class);
}
}
```
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