---
title: "Windows Agent 4.21"
slug: "windows-agent-421"
description: "Improved Windows & Java profilers, added stackify.json support, and File Extension whitelisting. Bug fixes for enhanced performance."
updated: 2019-07-29T21:39:46Z
published: 2019-07-29T21:39:47Z
canonical: "docs.stackify.com/windows-agent-421"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.stackify.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Windows Agent 4.21

**Release Date: 7/29/2019**

## Release Enhancements

- Updated Windows profiler to v4.0.16 to better support anonymous method names
- Updated the Java profiler to v1.27.5 for Java on Windows applications
- Added support to use a stackify.json file to set app name and/environment name through configuration
- Added support for File Extension whitelisting for App Change Detection

## Bug Fixes

- Fixed a bug where an exception would happen if an anonymized IP address existed in the domain name in the URL
- Fixed a bug where prompts for pre-req dependencies would break a silent install