Fix possible null pointer dereference

See merge request arsnova/arsnova-backend!98

Fixes regression introduced by commit
c88cce27.

fix exporting all answers on session export

See merge request !93

Tom Käsler authored 6 years ago and Daniel Gerhardt committed 6 years ago

See merge request !94

Migration version now falls back to -1 if no document exists.

This fixes a logging issue with threading causing messed up log
messages.

Logback

See merge request arsnova/arsnova-backend!91

A log file path can now be set via `arsnova.log.file` Java system
property. If a log file path is set, the threshold for STDOUT logging is
increased to WARN.

Support for java system properties to tune logging have been added:
* arsnova.log.exceptions
* arsnova.log.level
* arsnova.log.level.root
* arsnova.log.level.spring
* arsnova.log.properties

fetch content ids that are not in any content group and return them as a default group

See merge request arsnova/arsnova-backend!88

Add FindQueryService for Content

See merge request arsnova/arsnova-backend!90

Tom Käsler authored 7 years ago and Daniel Gerhardt committed 6 years ago

Currently supports finding contents by `roomId`.

Foundation for development of version 3.0

Closes #19

See merge request arsnova/arsnova-backend!89

Consistently use singular for packages which contain mixed kinds of
classes. Moved a few classes to packages that better fit them.