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Type: Component Upgrade
Resolution: Unresolved
Priority: Blocker
Fix Version/s: 32.0.0.Beta2
Affects Version/s: None
Component/s: Undertow
Labels:
None

Forum Reference:
https://wildfly.zulipchat.com/#narrow/channel/174184-wildfly-developers/topic/Undertow.202.2E4.2E0.20Upgrade/with/569128792

In ~~WFCORE-7462~~ we ran into an issue with changes to the Undertow API that were not compatible with the released version of Undertow 2.4.0. To simplify releasing and integrating these changes, we need to upgrade Undertow in WildFly Core to the 2.4.x stream.

Subsequently, we need to integrate the new undertow-ee artifacts into WildFly, as the Servlet and WebSocket implementations have been extracted from the core project. (Note: This is already been done in WildFly Preview).

Reference

Current Tag: 2.4.0.Alpha1
Diff: 2.3.22.Final...2.4.0.Alpha1

Technical Impact & Known Changes

Based on the diff between 2.3.22 and 2.4.0.Alpha1, the following areas in WildFly/Core will likely require adaptation:

UndertowOptions Cleanup (UNDERTOW-2379)
- There is a cleanup of deprecated options and constants.
- Action: Audit UndertowOptions usage for removed constants (e.g., check status of ENABLE_CONNECTOR_STATISTICS or similar deprecated flags) and ensure new defaults (like HTTP/2 settings) do not negatively impact existing configurations.
Strict Exception Handling (UNDERTOW-2249)
- Changes in connection handling may now strictly throw ClosedChannelException in scenarios where it was previously swallowed or silent (e.g., attempting to write to a closed exchange).

incorporates

UNDERTOW-1748 provide a way to "comment" a line in predicate language

Closed

UNDERTOW-2273 Exchange Attribute parser doesn't handle nested attributes

Closed

UNDERTOW-2301 HTTP/2 cannot be configured on a per-listener basis

Closed

UNDERTOW-2675 Make Undertow compatible with RFC6265

Closed

UNDERTOW-2646 Move servlet and websockets to Undertow EE

Pull Request Sent

UNDERTOW-1901 Add multipart support methods to ManagedServlet and HttpServerExchange signatures

Closed

UNDERTOW-2110 Allow line breaks in predicates

Closed

UNDERTOW-2249 HttpClientConnection.sendRequest on a closed connection should result in a ClosedChannelException

Closed

UNDERTOW-2254 Include the HttpServerExchange in the HostSelector

Closed

UNDERTOW-2288 Ignore line breaks inside of predicate and handlers for better readability

Closed

UNDERTOW-2325 secure-cookie() handler doesn't pick up directly-added set-cookie headers

Closed

UNDERTOW-2404 Directory listing has no sort

Closed

UNDERTOW-2634 Add mime mappings for mp4, webm, flac, weba, csv and webp

Closed

UNDERTOW-1904 HttpSessionImpl use exception driven control

Closed

UNDERTOW-2379 UndertowOptions default values need proper links and need to be used properly

Open

is related to

WFLY-21082 Move WildFly Preview to Undertow 2.4.0.Alpha1 and introduce Undertow EE

Resolved

(10 incorporates, 1 is related to)

Assignee:: Unassigned

Reporter:: James Perkins

Votes:: 0 Vote for this issue

Watchers:: 4 Start watching this issue

Created:: 2026/01/20 9:56 PM

Updated:: 2026/01/22 11:46 AM

Details

Description

Reference

Technical Impact & Known Changes

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