Minor Solution: check the identity primary key and not the username (it's changed after deletion)
RedScreen on vilbert (tomcat11) 8.4.3
2013-09-03 12:29:45,729 [TP-Processor14] ERROR AssertException - OLAT::ERROR % N11-E2 % org.olat.core.logging
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:23.0) Gecko/20100101 Firefox/23.0
*RedScreen* cannot release lock since the requestor of the release (frentix) is not the owner (201309031228_bkp_frentix) of the lock (deleteGroup@org.olat.admin.user.delete.TabbedPaneController::0)
<dispatchinfo>
<componentinfo>
<compname>olatMenuTree</compname>
<compclass>org.olat.core.gui.components.tree.MenuTree</compclass>
<extendedinfo>n/a</extendedinfo>
<event>
<class>org.olat.core.gui.components.tree.TreeEvent</class>
<command>ctncl</command>
<tostring>TreeEvent:
</tostring>
</event>
</componentinfo>
<controllerinfo>
<controllername>org.olat.admin.UserAdminMainController</controllername>
<controllername>org.olat.core.commons.fullWebApp.BaseFullWebappController</controllername>
<controllername>org.olat.core.commons.chiefcontrollers.controller.simple.SimpleBaseController</controllername>
<controllername>org.olat.core.commons.chiefcontrollers.BaseChiefController</controllername>
</controllerinfo>
</dispatchinfo>
>>> stack of 1.cause::org.olat.core.logging.AssertException: cannot release lock since the requestor of the release (frentix) is not the owner (201309031228_bkp_frentix) of the lock (deleteGroup@org.olat.admin.user.delete.TabbedPaneController::0)
-> at org.olat.commons.coordinate.cluster.lock.ClusterLocker.releaseLockEntry(ClusterLocker.java:191)
at org.olat.commons.coordinate.cluster.lock.ClusterLocker.releaseLock(ClusterLocker.java:165)
at org.olat.admin.UserAdminMainController.releaseDeleteUserLock(UserAdminMainController.java:528)
at org.olat.admin.UserAdminMainController.initComponentFromMenuCommand(UserAdminMainController.java:220)
at org.olat.admin.UserAdminMainController.event(UserAdminMainController.java:149)
at org.olat.core.gui.control.DefaultController.dispatchEvent(DefaultController.java:195)
at org.olat.core.gui.components.Component$1.run(Component.java:238)
at org.olat.core.logging.activity.ThreadLocalUserActivityLoggerInstaller.runWithUserActivityLogger(ThreadLocalUserActivityLoggerInstaller.java:108)
at org.olat.core.gui.components.Component.fireEvent(Component.java:235)
at org.olat.core.gui.components.tree.MenuTree.handleClick(MenuTree.java:253)
at org.olat.core.gui.components.tree.MenuTree.doDispatchRequest(MenuTree.java:169)
>>> stack of 2.cause::java.lang.Exception: assertionstackgenerator
-> at org.olat.core.logging.AssertException.<init>(AssertException.java:51)
at org.olat.commons.coordinate.cluster.lock.ClusterLocker.releaseLockEntry(ClusterLocker.java:191)
at org.olat.commons.coordinate.cluster.lock.ClusterLocker.releaseLock(ClusterLocker.java:165)
at org.olat.admin.UserAdminMainController.releaseDeleteUserLock(UserAdminMainController.java:528)
at org.olat.admin.UserAdminMainController.initComponentFromMenuCommand(UserAdminMainController.java:220)
at org.olat.admin.UserAdminMainController.event(UserAdminMainController.java:149)
at org.olat.core.gui.control.DefaultController.dispatchEvent(DefaultController.java:195)
at org.olat.core.gui.components.Component$1.run(Component.java:238)
at org.olat.core.logging.activity.ThreadLocalUserActivityLoggerInstaller.runWithUserActivityLogger(ThreadLocalUserActivityLoggerInstaller.java:108)
at org.olat.core.gui.components.Component.fireEvent(Component.java:235)
at org.olat.core.gui.components.tree.MenuTree.handleClick(MenuTree.java:253)
