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LDEV-4252: Use another collection type instead of synchronisation.

file LogLessonMarkPushedToIntegrationsServlet.java was initially added on branch lams2_head_wildfly.

LDEV-4312 Handle unsuccessful mark submission to integrated servers

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LDEV-4175: Remove unncessary synchronisations and commented out code.

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LDEV-4290 Removed caching of progress bar messages as it makes the language first used stick for all users.

LDEV-4288: Archive gradebook on lesson retry. Remove activity content on lesson retry.

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LDEV-4278: Put and get activity ID from form since it is not present in request anymore.

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LDEV-4272: Check if learner progress belongs to the logged in user.

LDEV-4260: Make sure that lesson corresponds to the activity.

LDEV-4252: Use another collection type instead of synchronisation.

LDEV-4224: Pass IDs instead of objects into transactional methods so the objects are not cached and reused in subsequent retries.

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LDEV-4155 In order to be able to use "history.back()" without any problems - using redirect in NotebookAction

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LDEV-4187: Make sure that even after an exception is thrown, the Hibernate session is closed. Add extra logging to verify completeActivity() failures.

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LDEV-4198: Re-committing Fiona's changes: Do not try to get the Floating Activity URL for the progress bar. It does not exist and just results in an error in the log. If isFloating = true then we have come from the progress bar, if isFloating = false we have come from elsewhere in the system and we should get the "broken progress" screen just in case LAMS does try to show to floating activity somewhere.

LDEV-4175: Do not put DB entities (LearnerProgress, Activity) into request as this can cause problems. Better stick to IDs as parameters.

LDEV-4198: Do not try to get the Floating Activity URL for the progress bar. It does not exist and just results in an error in the log. If isFloating = true then we have come from the progress bar, if isFloating = false we have come from elsewhere in the system and we should get the "broken progress" screen just in case LAMS does try to show to floating activity somewhere.

LDEV-4187: Open new session on Presence Chat websocket thread run.

LDEV-4187: Reprocess the learner progress for a lesson, basing any missing entries from data gathered from the related tool or system activity.

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file RepopulateProgressMarksServlet.java was initially added on branch lams2_head_wildfly.

LDEV-4187: Delegate non-HTTP-request tasks to own threads. Open and close Hibernate session for each of such thread. Bind created session to context and thread. Close session at the end of thread execution.

LDEV-4187: Synchronise completeActivity() method again. Do not pull LearnerProgress from DB as the same object seems to be fetched fron cache anyway. Add extra logs for attempted->completed activity transition.

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LDEV-3765: Make sure all necessary objects still exist when unregistering an user.

LDEV-4175: Prevent a CompleteToolSession race exception caused by optimistic locking from canceling the whole transaction.

LDEV-3292: Get rid of learner progress object juggling when compling an activity. It looked like there were several objects but all changes were done on the same one. It could also lead to two objects referencing the same row in DB which resulted in an exception while saving.

LDEV-3653: Make sure that a websocket is open before sending any messages.

LDEV-4075: Get rid of Next Activity button in preview Branching.

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LDEV-4057 :Sort activities in sequence or chronological orders in .xls export

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LDEV-3971: Remove pointless synchronisation from Java methods. It would not work in multi-node environment anyway. Focus on DB transactions.

General clean up and formatting.

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file Command.java was initially added on branch lams2_head_wildfly.

file CommandDAO.java was initially added on branch lams2_head_wildfly.