ruthst00 opened a new pull request, #16516: URL: https://github.com/apache/grails-core/pull/16516
## Description <!-- Describe your change and the problem it solves. Link to the related issue(s) if they exist. --> **Root Cause:** Several `render()` branches in `ResponseRenderer.groovy` set `webRequest.renderView = false` and wrote content to the response, but never called `response.flushBuffer()`. This left the response uncommitted, causing Spring MVC's `DispatcherServlet` to attempt default view resolution after the action returned, resulting in a `ServletException: Could not resolve view with name '<actionName>'`. **Fix:** Added `response.flushBuffer()` after content is written in every render branch that sets `renderView = false`: 1. `render(Object)` — after writing `object.inspect()` 2. `render(CharSequence)` — after writing and flushing the writer 3. `render(Map, Writable)` — after `renderWritable()` 4. `render(Map)` with `text:` (Writable) — after `renderWritable()` 5. `render(Map)` with `template:` — after all template rendering paths 6. `render(Map)` with `file:` — after `SpringIOUtils.copy()` 7. `renderMarkupInternal()` — after `renderWritable()` (covers `render(Closure)` and `render(Map, Closure)` markup path) 8. `renderJsonInternal()` — after `jsonBuilder.call()` (covers `render(Map, Closure)` JSON path) The `render(Map)` with `status:` branch already had `response.flushBuffer()` — this fix brings all other content-writing branches into parity. **Tests:** Added 10 new Spock feature methods to `ResponseRendererSpec` verifying that `response.isCommitted()` is `true` after each render variant. All 17 tests in the spec pass, the full `grails-controllers` test suite passes, and all violation reports (Checkstyle, CodeNarc, PMD, Repository Conventions) are clean. Fixes [#15819](https://github.com/apache/grails-core/issues/15819) Generated with [Claude Sonnet 4.6](https://www.anthropic.com/claude/sonnet) via [Cline API Provider](https://cline.bot/) ## Contributor Checklist Please review the following checklist before submitting your pull request. Pull requests that do not meet these requirements may be closed without review. ### Issue and Scope - [X] This PR is linked to an existing issue that has been **acknowledged or approved** by the project team. If no approved issue exists, please give background on why this change is necessary. Tickets are preferred for release change log history. - [X] This PR addresses the **complete scope** of the linked issue. Partial implementations or unfinished work should not be submitted for review. - [X] This PR contains a **single, focused change**. Unrelated changes should be submitted as separate pull requests. - [X] This PR targets the **correct branch** for the type of change: - **Patch release branches** (e.g., `7.0.x`): Bug fixes only. No new features or API changes. - **Minor release branches** (e.g., `7.1.x`): New features are welcome, but breaking existing APIs must be avoided. - **Major release branches** (e.g., `8.0.x`): Reserved for major changes. Breaking API changes are permitted. ### Code Quality - [X] I have **added or updated tests** that cover the changes introduced in this PR. All code contributions are expected to include appropriate test coverage. - [X] I have verified that all existing tests pass by running `./gradlew build --rerun-tasks`. - [X] My code follows the project's **code style** guidelines. I have run `./gradlew codeStyle` and resolved any violations. 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