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Type: Component Upgrade
Resolution: Unresolved
Priority: Blocker
Fix Version/s: 32.0.0.Beta5
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).

blocks

WFLY-21381 Add support for SECURE_PROTOCOL tag to ExchangeAttributeDefinitions

Pull Request Sent

incorporates

UNDERTOW-2464 Create a default constant for UndertowOptions.DECODE_URL

Closed

UNDERTOW-2465 Fix UndertowOptions.URL_CHARSET Javadoc

Closed

UNDERTOW-2466 Create a default constant for UndertowOptions.ALWAYS_SET_KEEP_ALIVE

Closed

UNDERTOW-2467 Create a default constant for UndertowOptions.ALWAYS_SET_DATE

Closed

UNDERTOW-2484 Create a default constant for UndertowOptions.HTTP2_PADDING_SIZE

Closed

UNDERTOW-2491 Create a default constant for UndertowOptions.SSL_USER_CIPHER_SUITES_ORDER

Closed

UNDERTOW-2492 Create a default constant for UndertowOptions.ALLOW_UNESCAPED_CHARACTERS_IN_URL

Closed

UNDERTOW-2494 Create a default constant for UndertowOptions.QUEUED_FRAMES_HIGH_WATER_MARK

Closed

UNDERTOW-2495 Create a default constant for UndertowOptions.QUEUED_FRAMES_LOW_WATER_MARK

Closed

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

Closed

UNDERTOW-1881 Add a new exchange attribute for SSL/TLS protocol version

Closed

UNDERTOW-2010 Provide method to invalidate all paths in CachingResourceManager

Closed

UNDERTOW-2242 Add UndertowOptions.ALLOW_ID_LESS_MATRIX_PARAMETERS

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-2319 Move io.undertow.multipart.minsize property to UndertowOptions

Closed

UNDERTOW-2553 Add rewriteHostHeader to ModCluster

Closed

UNDERTOW-2696 Allow PathHandler to check for registered prefixes

Closed

UNDERTOW-2706 Add UndertowOptions_WEB_SOCKETS_READ_TIMEOUT

Closed

UNDERTOW-2588 Undertow response can still break in case of Java 17 TLSv1.3 NewSessionTicket

Resolved

UNDERTOW-2676 Do not set merged query parameters for includes and forwards on the exchange, only the request

Closed

UNDERTOW-1794 DefaultAccessLogReceiver violates Closeable contract

Closed

UNDERTOW-2421 ServletSessionConfig is missing support for arbitrary cookie attributes

Closed

UNDERTOW-2194 Cookie parsing/assembling does not work 100% correctly.

Closed

UNDERTOW-2590 Support "rspauth" in Digest auth header

Closed

UNDERTOW-2686 HttpSession.Accessor can throw ISE if session identifier has since changed

Closed

UNDERTOW-2646 Move servlet and websockets to Undertow EE

Closed

UNDERTOW-2684 Add SessionManager.isDistributed()

Closed

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

is blocked by

UNDERTOW-2712 The deprecated getRequestCookies() and getResponseCookies() need to return a valid map

Resolved

UNDERTOW-2710 Some pom.xml files reference the removed undertow-servlet and undertow-websockets-jsr modules

Closed

WFLY-21503 Migrate Undertow Servlet and Undertow WebSocket to the Undertow EE

Pull Request Sent

is related to

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

Closed

(33 incorporates, 3 is blocked by, 1 is related to)

Assignee:: Flavia Rainone

Reporter:: James Perkins

Votes:: 0 Vote for this issue

Watchers:: 5 Start watching this issue

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

Updated:: 2026/02/25 9:57 PM

Details

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Technical Impact & Known Changes

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