https://answers.axonivy.com/questions/2296/can-not-destroy-done-task<p>Hi all</p> <p>I'm trying to remove task on server, here is the API</p> <pre><code>public static void destroyPendingTasksByProcessContext(String processKey) throws EnvironmentNotAvailableException, PersistencyException, Exception{ SecurityManagerFactory.getSecurityManager().executeAsSystem(() -&gt; { TaskQuery taskQuery = TaskQuery.create() .where().customVarCharField5().isEqual(processKey); List&lt;ITask&gt; tasks = Ivy.wf().getTaskQueryExecutor().getResults(taskQuery); tasks.forEach(destroyTask -&gt; { destroyTask.destroy(); }); return StringUtils.EMPTY; }); } </code></pre> <p>in the query you can see i use a processkey as a flag to destroy all tasks which are related to my project. And i got this exception:</p> <pre><code>Caused by: java.lang.IllegalStateException: State of Task must be one of the following values DELAYED, SUSPENDED, PARKED, RESUMED, UNASSIGNED, FAILED, READY_FOR_JOIN, JOINING, JOIN_FAILED, CREATED, WAITING_FOR_INTERMEDIATE_EVENT but is DONE (The task might have been finished by another user.) </code></pre> <p>How can we solve it? Thanks</p>enFri, 16 Dec 2016 11:46:13 -0500https://answers.axonivy.com/questions/2296/can-not-destroy-done-task/2301<p>It’s not possible to destroy a task in state DONE.</p> <p>A Task in state DONE or DESTROYED implies that the task has been finished. The state DONE implies a normal ending, the state DESTROYED an abnormal ending (performed by a user / API call). As the state diagram below shows, both are ending states.</p> <p><img alt="Task States" src="http://answers.axonivy.com/upfiles/TaskStateOverview_0wtY7zn.png"></p> <p>Btw, when you try to delete a Task/Case physically from the DB the answer <a href="http://answers.axonivy.com/questions/478/how-to-cleanup-old-cases-tasks">how-to-cleanup-old-cases-tasks</a> could help.</p>Flavio SadeghiFri, 16 Dec 2016 11:46:13 -0500https://answers.axonivy.com/questions/2296/can-not-destroy-done-task/2301