---
slug: "azure-app-service-java-21-end-of-support"
title: "Azure App Service: Java 21 end of support"
summary: "End of support date for Java 21 on Azure App Service: Sep 2028. Apps that use this version continue to run unchanged, but App Service can't provide security patches or related customer support for it past that date."
cloud: "azure"
service: "Azure App Service"
service_slug: "app-service"
category: "runtime"
type: "end_of_support"
announced_date: null
effective_date: "2028-09-01"
effective_precision: "month"
replacement: null
affected_versions: ["21"]
source_url: "https://learn.microsoft.com/en-us/azure/app-service/language-support-policy"
extra_source_urls: ["https://learn.microsoft.com/en-us/java/openjdk/support"]
vendor_ref: "appservice@java:21"
last_checked_at: "2026-11-12T09:56:00.082Z"
created_at: "2026-11-13T13:36:44.208Z"
updated_at: "2026-11-13T13:36:44.208Z"
url: "https://eolwatch.dev/items/azure-app-service-java-21-end-of-support"
short_url: "https://eolwatch.dev/i/ac"
markdown_url: "https://eolwatch.dev/items/azure-app-service-java-21-end-of-support.md"
json_url: "https://eolwatch.dev/items/azure-app-service-java-21-end-of-support.json"
source_note: null
---

# Azure App Service: Java 21 end of support

End of support date for Java 21 on Azure App Service: Sep 2028. Apps that use this version continue to run unchanged, but App Service can't provide security patches or related customer support for it past that date.

- Effective date: Sep 2028 (month precision: the vendor gives no day)
- Cloud: [Azure](https://eolwatch.dev/cloud/azure.md)
- Service: [Azure App Service](https://eolwatch.dev/services/azure/app-service.md)
- Type: End of support
- Category: [Runtime](https://eolwatch.dev/categories/runtimes.md)
- Affected versions: 21
- Replacement: Not stated by vendor
- Announced: Not stated by vendor
- Official source: [learn.microsoft.com](https://learn.microsoft.com/en-us/azure/app-service/language-support-policy)
- Last checked: 12 Nov 2026

## What breaks

After Sep 2028, apps that use Java 21 continue to run unchanged, but App Service can't provide security patches or related customer support for that runtime version.

- An app on an unsupported language version must be upgraded to a supported version before it can get App Service support.
- App Service sends reminder notifications about end-of-support dates to subscription owners.
- Contributors, readers, or other roles don't directly receive notifications unless they opt in through Service Health Alerts.
- For Java, the page adds that developers who use a supported Java runtime that is retired receive a deprecation notice at least six months before the runtime is retired.

## Who is affected

### Affected versions

- `21`

### Matching resource types

- `microsoft.web/sites`
- `azurerm_linux_web_app`
- `azurerm_windows_web_app`

### Fields the check reads

- `linuxfxversion`
- `kind`
- `site_config.application_stack.java_version`
- `site_config.application_stack.current_stack`

### Detected by the estate check from

- Azure Resource Graph export (CSV or JSON)
- Terraform state or plan (JSON)
- ARM template

## What to do

1. Find the language version the app uses. The [language runtime support policy](https://learn.microsoft.com/en-us/azure/app-service/language-support-policy) links "Show language version" resources for .NET, Java, Node, Python and PHP.
2. Choose a supported version of Java. The same page links the support timeline of each language community.
3. Set the new language version for the app. The same page links "Set language versions" resources for .NET, Java, Node, Python and PHP.

## Replacement

Not stated by vendor.

## Sources

- [Official source](https://learn.microsoft.com/en-us/azure/app-service/language-support-policy) (learn.microsoft.com, Official)
- [Additional source](https://learn.microsoft.com/en-us/java/openjdk/support) (learn.microsoft.com, Official)

Last checked against the first source in this list on 12 Nov 2026.

Page: https://eolwatch.dev/items/azure-app-service-java-21-end-of-support | JSON: https://eolwatch.dev/items/azure-app-service-java-21-end-of-support.json

The text on this page is drafted with AI assistance from the vendor's text, checked against the official source and approved by a person before it is published.