AWI Error: Unable to lock session – Users unable to Login to AWI

Products

• CA Automic Workload Automation - Automation Engine

Issue/Introduction

The users intermittently experience issues logging in to AWI and during that time logging into the system is completely impossible.

Restarting the AWI server serves as a workaround.

After restart of the AWI, logging in worked again, and the error no longer occurs.

There are error messages in the AWI log during the issue time frame:

2025-04-01 07:54:58,289 127.0.0.1-8009-exec-37 [WARN ] NOLOGIN/- NOUI   [com.uc4.ecc.framework.entrypoint.vaadin14.V14Session] - Unable to lock the session 4C2BCDEB49C671E7D77E80CACE5774C1

2025-04-01 07:54:58,289 127.0.0.1-8009-exec-37 [ERROR] NOLOGIN/- NOUI   [com.uc4.ecc.framework.entrypoint.vaadin14.LockStatus] - Deadlock detected in Lock: 2025-04-01T05:43:36.840 Thread[ajp-nio-127.0.0.1-8009-exec-17,5,main] java.util.concurrent.locks.ReentrantLock@fd93f8d[Locked by thread ajp-nio-127.0.0.1-8009-exec-17]

java.lang.Throwable: null

            at com.uc4.ecc.framework.entrypoint.vaadin14.LockStatus.<init>(LockStatus.java:21)

            at com.uc4.ecc.framework.entrypoint.vaadin14.V14Session.lock(V14Session.java:135)

            at com.vaadin.flow.server.communication.PushHandler.callWithUi(PushHandler.java:212)

Environment

AWI 21.0.12 and 24.x

Cause

DE168934

Resolution

Update to a fix version listed below or a newer version if available.

Fix version:
Component(s): Automic Web Interface
Automation.Engine 21.0.15 - Available
Automation.Engine 24.4.2 - Available

Additional Information

Public Description: A problem has been solved that prevented users from logging in to AWI.