feat(http-client-java): expose required-fields-as-ctor-args option to tspconfig

[weidongxu-microsoft]

Expose the required-fields-as-ctor-args emitter option to tspconfig.yaml for data-plane. Previously it was hard-coded to true in TypeSpecPlugin. The default remains true; users can now opt out.

options:
  "@typespec/http-client-java":
    required-fields-as-ctor-args: false

Changes

• emitter/src/code-model-builder.ts — add required-fields-as-ctor-args to EmitterOptionsDev so the option flows from tspconfig into the JSON passed to the Java generator.
• generator/.../model/EmitterOptions.java — add field, getter, and JSON parsing.
• generator/.../TypeSpecPlugin.java — override the setting only when the user sets it; the static default stays true.

[weidongxu-microsoft]

Validation performed

Built the emitter + Java generator, packed via Setup.ps1, then generated a model with required properties twice from the same spec — once with the default and once overriding the option — and compared the generated Widget model.

Spec used:

model Widget {
  @visibility(Lifecycle.Read)
  id: string;

  requiredName: string;
  requiredCount: int32;
  optionalDescription?: string;
}

Default (required-fields-as-ctor-args: true) — required fields become constructor args, no setters:

public Widget(String requiredName, int requiredCount) {
    this.requiredName = requiredName;
    this.requiredCount = requiredCount;
}

Override (required-fields-as-ctor-args: false) — no-arg constructor, required fields get setters:

public Widget() {
}

public Widget setRequiredName(String requiredName) { ... }

public Widget setRequiredCount(int requiredCount) { ... }

This confirms the option flows from tspconfig.yaml through the emitter into the Java generator, and that the default behavior is unchanged (true).

[github-actions]

All changed packages have been documented.

• ✅ @typespec/http-client-java

Show changes

@typespec/http-client-java - feature ✏️

Expose the required-fields-as-ctor-args emitter option in tspconfig.yaml. It controls whether required model properties are generated as constructor arguments. The default remains true.,> ,> yaml,> options:,> "@typespec/http-client-java":,> required-fields-as-ctor-args: false,>

[azure-sdk-automation]

You can try these changes here

🛝 Playground	🌐 Website	🛝 VSCode Extension

[weidongxu-microsoft]

with the improved instruction https://github.com/microsoft/typespec/blob/main/.github/instructions/http-client-java.instructions.md#modify-the-code-generator-emitter--generator-e2e-loop
now we can just ask agent to write a tsp and test -- kind of close the loop of impl :-)