#30123 The scheduler incorrectly reports "There is no thread to remove" when a task fails to start

enhancement

major

#29993

Configuration: Each configured function can be implemented in either Java or TL-Script, using the same configuration syntax (including in the React configuration editor)

#30000

Design System UI pass, part 1: one selection form; surface-interactive-selected becomes surface-interactive-strong

#30006

Engine Extensions for the Tax Application: writable secret storage in the database, application context path in development mode (tl.contextPath), and instance search by attribute value

#30025

React UI: Hide commands and units for which the logged-in user does not have the required role on any object

#30031

The database does not enforce uniqueness of reference values without duplicates: a unique index on the link tables, separate link tables for bags

#30041

Self-service accounts: invitations expire and record their acceptance, invitations can be accepted and managed in the React UI, localized mail templates

#30045

View layer slots: report a <slot-content> that reaches no <slot>, empty fallback of a <slot>, slot positions in split panels and the sidebar

#30053

Agent runs: bound the pool of parallel tool calls (AgentLoop.TOOL_WORKERS) and tell a user whose chat message waits for a free worker

#30054

Agent screenshots belong to their chat: deleted with it, shown as thumbnails in the chat

#30057

Administration of the React UI: scheduler (task list, run now, stop, activate/deactivate, cluster lock, run history) with one unified active/inactive switch per task

#30058

Administration of the React UI: memory trend chart (memory use over time incl. garbage collection) and the remaining monitoring views of the classic UI

#30059

Administration of the React UI: maintenance functions of the classic maintenance pages (database export/import/history compaction, SQL console, reload, search index, security storage, encryption)

#30061

React UI: recent changes of the user with revert of a commit (user menu)

#30062

Model editor of the React UI: instance browser and instance import of the selected type

#30063

Administration of the React UI: people (contacts with optional login) in one form

#30064

Administration of the React UI: login messages (messages shown at login, with their validity)

#30065

React Interface: Workflow Administration with BPMN Editor, Step Views from the View Designer, and Task Editing (BPE)

#30066

React Administration: View and Explain an Account's Effective Permissions on an Object (Role Inspector)

#30074

React Interface: Signing In with Passkeys (WebAuthn) — passwordless or as a second factor alongside TOTP; managing your own passkeys in the settings

#30075

Log View (React UI): Display the details of an entry (stack trace) in a dialog in a readable format

#30076

React Interface: Password change with confirmation message and validation before the identity prompt; protection against brute-force attacks on passwords and one-time codes

#30081

TL Views: Change Authenticator App (New TOTP Secret), Reset Two-Factor Authentication by Administrator

#30086

XML import: <update> of <unless-known> must restate the structure of the descendants it updates

#30088

View layer: document how a ChannelSource keeps a monitor running while its view is hidden and ends it with the window

#30095

OpenAPI Client: Parameter Value from a Secret Source

#30096

Rights System: Remove the configurable group mapper from the ElementAccessManager

#30097

Generate JavaScript libraries (umljs, ace, require.js, bpmn-js) in the Maven build instead of checking them in; update bpmn-js to version 18

#30098

Design system as an engine module: built by Maven instead of a checked-in copy with seals

#30104

Nightly preview builds of the engine with a fixed Maven version and a changelog instead of a rolling SNAPSHOT

#30108

pac4j Registration: The account mapping receives the identity provider's full identity (subject, claims) rather than just a login name

#30116

CommonMark: Displaying Tables (GFM) as HTML Tables

#30117

Refetch timeout does not specify the thread holding the commit/refetch lock

#30120

View layer: options of a string attribute cannot have display labels

#30122

Remove TLDoclet exceptions in ext/javadoc/javadoc-ignores

#30126

tl-chat: Chat actions run as React commands within the window rather than via a separate ChatServlet; the chat's proxy workaround is no longer used in favor of engine polling

#30131

View layer: show the fallback of AttributeWithFallbackStorage as placeholder of a form field

#30132

View layer: value listeners of the model (<value-listeners>) react to field changes in the React form, through a UI-independent listener contract

#30148

RecollateStringColumnsProcessor: Run ANALYZE after changing the collation (PostgreSQL)

#30149

Let a chat agent run page commands that the page of the chat allows, e.g. open a dialog

#30150

Ship a provider with recorded model answers for the agent tests of applications

#30151

React View Layer: Commands Without HandlerResult - View commands report errors as exceptions; React command handlers return their response as a msgbuf message

#30157

React Interface: Insert images into the HTML editor using Ctrl+V and drag-and-drop; resize using handles; never wider than the content

#30158

TL Chat: Let a chat agent pass the input of a page command it runs

#30160

Adding Albert to an application: shipped React chat page, how-to article and archetype defaults

#30163

SQLFactory: Generate column changes (modifyColumnName/Type/Mandatory) only with a complete column definition

#30167

Remove database defaults for columns: Add required columns using "create, populate, set as required"

#30172

Create accounts at an external login and assign their groups from a claim

#30179

An application generated with useSSO=true offers the generic OpenID login, switched on by the tl_pac_* environment variables, also on the development server

#30183

Self-Service: Open self-registration without an invitation

#30190

Remove the control application tl-factory from the engine, it is developed in its own repository

#30200

Agent Access and Recording: Commands operate on stable object IDs; technical keys are used only for recording and playback

#30215

View layer: a value channel whose value is remembered per user

#30223

Self-service mails: texts editable in the service configuration, language of an invitation selectable

#30225

Model: handlers declared on an attribute (change) or a type (creation, deletion), run within the commit

#30227

Design System UI pass, part 1b: tables with depth and visible column boundaries

#30250

TL Views: <start-job> / <job-status> - close button for an ended job, point of no return, partial result of a cancelled job, closing the dialog from the follow-up, follow-up sees the job's commits

#30253

tl-ai-core pulls the Playwright browsers (driver-bundle, 200 MB) into every application: browser tools move into the optional module tl-ai-browser

#30266

React Configuration Editor: Multi-line text (HTML, Markdown, code, multi-line) uses the entire line by default

#30267

Setting and removing administrative secrets; writable directory storage

#30268

System Environment: Display the source of configuration variables and set variables from the administration interface

#30276

AI Agents: Meaningful commit messages for changes made by an agent instead of "Agent edit"

minor

#30139

TL Views: Unit and Custom Number Format for Number Fields

#30188

TL Script: Read a binary value as text; Read a web app resource as a binary value

#30209

React Table: Show and Hide Columns Based on Channel Values (exists-if)

#30218

ModificationListener: no supported way to report to the user what a Modification changed, once the commit succeeded

defect

critical

#30146

Data migration is not protected against parallel execution when multiple cluster nodes are started simultaneously

#30196

Canceling a background job (TL Views <start-job>, Scheduler Task, JMS Consumer) interrupts the thread in the middle of a database operation and closes an embedded H2 database (MVStore panic, application becomes unusable)

#30224

TestFlowSvgPortable does not compile: FlowFactory.chart() has the parameter fixedView

#30301

React-Views: TestTreeTableRowEdit no longer compiles on master (ExpandArguments.ROW_INDEX replaced with ROW_ID)

major

#29847

Scripted test TestTransactionMonitor-01_RevertRevision fails when a scheduled task commits concurrently

#30043

TL Views: a value the server sets while the React rich-text editor has the focus is never applied; the composer keeps its text after sending

#30067

React Interface: Logging in in one browser tab immediately logs you out if a second tab for the application is open

#30077

TL Views: Wizard—re-entering an "Auto-Next" step without a separate navigation path leaves the user with no way to return to the workflow

#30078

React Interface: When setting up two-factor authentication, the key for manual entry is not displayed; only the QR code is shown.

#30079

Configured SecurityParents do not work with StructuredElementWrapper

#30082

React UI: Tabs in a dialog change the page's address and remain in the URL after the dialog is closed

#30090

Scheduler: A task that is due at startup is detached during shutdown while it is still running (NullPointerException in TaskImpl.getLog())

#30099

Scheduler tests: testStartTaskImmediately and testPeriodically have occasionally timed out since the scheduler was revised

#30103

tl-maven-plugin: If merging the view overlays fails during application build, the build remains green

#30106

tl-chat: Commands at the top of a data-list do not display their status (hidden, disabled with reason); clicking on a locked command produces no response

#30107

tl-maven-plugin: If generating a layout fails during application build, the build remains green

#30109

tl-chat: After logging in, the chat in the same browser window remains at "Log in to use the chat"

#30110

An aborted external login (OIDC) leaves a logged-in session without tokens

#30115

delete-module / delete-class do not clean up hasWrapperAttValue data

#30118

Passkeys per application can be used either for password-less login or as a second factor, but not both at the same time

#30119

AlterColumnProcessor does not update stored schema for abstract types

#30123

The scheduler incorrectly reports "There is no thread to remove" when a task fails to start

#30124

OpenAPI Server: The error message for a failed script is unreadable and is generated outside the interaction context

#30125

Agent access: /agent-api answers a request without a valid credential with a redirect to the login page instead of 401

#30127

An application at the server root keeps its session: the session cookie is sent to all its paths, and the React page announces its icon

#30128

A run without provider credentials ends as an authentication failure, and HTTP 402 is a billing failure for every provider

#30133

View layer: a field mandatory by dynamic visibility loses its required marker on a validation change

#30141

TypeIndexer: Java 21 as a supported source version; Index records

#30143

TL Chat: While an agent is performing multiple steps, their last message remains visible, and the status bar displays the current step instead of just showing "…" and "Working on …"

#30144

Chat sessions are invisible to their owner in an application with model-based security

#30147

React Interface: The "More Actions" menu does not close when the Escape key is pressed if all items are disabled

#30159

React UI Script Recorder: Recordings of tree, multiple-selection, and dropdown assertions can be replayed in a different session

#30164

TL Chat: A run that fails with an exception leaves no error in the conversation; it is gone after a reload

#30165

React: A command with ignoreStaleUi to a control that left the display still fails with 404 "Control not found"

#30166

TL Chat: runPageCommand gives the model the refusal of a page command in English instead of the user's language

#30173

OIDC login button is offered although the client has neither discovery URI nor provider metadata

#30176

The development server stops on /admin/stop from any address

#30177

The development server ignores X-Forwarded-* headers, so a relative callback URL behind a proxy names the wrong origin

#30184

DeleteTableProcessor does not remove " <alternative>" elements from the stored schema

#30201

Commit veto of the model constraints: a failed job (and its log) shows only "Cannot store, constraints violated." without the problems

#30216

Background processing fails with the error "Session revision invalid" if the window saves data while it is running (jobs, AI runs)

#30231

HtmlResKey: Also read the value as an attribute (add format)

#30244

tl-archetype-deploy: Declare the archetype integration test's dependency on tl-demo

#30247

Migrating to PostgreSQL with `autosave=NEVER`: Expected SQL errors abort the transaction

#30251

tl-ai-core, Anthropic provider: Claude 5.5 models missing from the bundled model catalog, and claude-haiku-5-5 sent a thinking budget (HTTP 400)

#30252

tl-ai-mcp-server: tools/list is not filtered by the caller's tool access, and /mcp/ with a trailing slash answers 404

#30254

tl-chat: A missing API key is reported as a rejected key ("The model rejected the access key")

#30255

tl-ai-core: agent turn rolled back with "Create on objects of type ... without permission" when a tool creates a part in an object created in the same turn - remove the duplicate pre-commit guard, check initial values in TL-Script

minor

#29961

React applications include modules from the classic interface (self-service, WYSIWYG editor, code editor, search, monitoring, AI administration)

#30044

TL Views: a sidebar separator stays visible when every item after it is hidden; the anonymous session sees the system separator with nothing below it

#30085

Default values <country value="..."/> and <time-zone value="..."/> (CountryDefaultProvider, TimeZoneDefaultProvider) cannot be used

#30089

The TL script functions `binarySize()` and `modelHealthReset()` return integers instead of doubles and log an error on every call

#30121

Compile-Errors in Eclipse in TL 8 alpha12

#30134

View layer: <composition-table> ignores the visibility (dynamic-visibility, hidden, read-only) of its composite attribute

#30140

TL Views: TestViewsLoad does not detect an undefined variable in a computed-column's value expression

#30142

CommaSeparatedStringSet: Non-deterministic serialization creates duplicate key attributes in the schema baseline

#30180

Flowchart (Gantt): Clicking on an element does not select anything if frozenRows > 0

#30181

Flowchart (Gantt): The chart is always displayed in full—no vertical scrolling, but it becomes unreadable when there are many rows

#30185

Flowchart (Gantt): LineDeco labels (e.g., “Today”) are cut off beneath fixed headers; edges without arrowheads

#30187

Exporting diagrams as SVG (reactFlowToSvg, flowToSvg) is not suitable for Batik or printing

#30191

Module shutdown stops no module at all if the class of its InContext job cannot be loaded (database stays open in the container's JVM)

#30197

React Table: Date cell in in-place edit accepts any partial keyboard input (e.g., year 0002)

#30198

React Views: Tree Table ({{{<tree-table>}}}) without row editing ({{{row-edit}}}) – not a replacement for the classic tree grid

#30199

React-Views: When a constraint is violated, the editable table displays only a red border, not an error message

#30204

React Table: When there are multiple row types, attribute columns are resolved only for the first type (label, sorting, filter)

#30205

React Table with Row Edit: A column based on a derived attribute is editable, but saving fails

#30206

React: A disabled `upload-command` does not display a reason; `null-input-disabled` always disables it

#30207

React: Button with an upload action does not open the file dialog

#30208

React Table: No cell display for external links (URL)

#30211

React: The built-in rules for `delete-object` and similar take precedence over the configured ones (making `visible-if` ineffective)

#30212

React: `null-input-disabled` only checks the first input

#30213

Binary attribute: Querying the content type loads the entire content; BLOB columns in object tables are loaded only for small values

#30214

View layer: tooltips drop the line breaks of their text (.tl-tooltip__body has white-space: normal)

#30226

React Table: Commands are unaware of the displayed rows or their order

#30237

React-UI: No display while a command is running on the server

#30256

React-UI: Set the color role of a row, cell, or view as a separate script (row-role, cell-role, role) instead of the ineffective status classes tl-status-*

#30257

React-UI: Commands from a window in a detached session generate two WARN lines per command

#30258

React-UI: The only way to display tabs for a single type is by using a type deviation in `access-control`, and that is logged as a WARN.

#30259

KB: Committable.rollback() is called after a successful database commit if the changes or caches fail to be published

#30265

TL Script: When `throw()` is used or a `TopLogicException` occurs, `try()` passes only the message text to the `catch` block instead of the `ResKey`.

#30269

ModelAccessRights.isAllowed(Person, ...): Checks whether another person is granted bypass or admin status in the current context

task

major

#30046

Remove the unused service ReactComponentRegistry

update

critical

#30111

Update dependency requirejs to ^2.3.7 [SECURITY]

defect

major

#30123

The scheduler incorrectly reports "There is no thread to remove" when a task fails to start

Problem

If a task fails to start before its thread has been created, the scheduler writes a misleading error message to the log in addition to the actual error:

ERROR ... SchedulerEntry  There is no thread to remove. SchedulerEntry(task = '...RefreshUsersTask...', state = STARTING, thread = 'null', ...)
java.lang.IllegalStateException: There is no thread to remove. ...
    at com.top_logic.util.sched.entry.SchedulerEntry.removeThread(SchedulerEntry.java)
	at com.top_logic.util.sched.Scheduler.ensureActiveOrScheduled(Scheduler.java)
    at com.top_logic.util.sched.Scheduler.tryStartTask(Scheduler.java)
    ...

This was observed in a production system when `Scheduler.requestClusterLock ` failed during commit with a ` KnowledgeBaseRuntimeException ` ("Commit aborted in response to long-running concurrent refetch.").

Cause

Scheduler.tryStartTask catches errors that occur when starting a task and calls ensureActiveOrScheduled. For an entry in the STARTING state, this method always calls SchedulerEntry.removeThread(). However, the thread is not created until ` startTaskNow` is called. If the start fails beforehand—for example, when requesting the cluster lock, during the maintenance mode check, or due to the task log—there is no thread, and `removeThread()` reports an error.

Solution

`ensureActiveOrScheduled` now removes the thread in the STARTING state only if one exists. The second caller of `removeThread()`, `Scheduler.taskDone`, remains unchanged. It is called only for entries in the RUNNING state, and those always have a thread.