Open reviews in code

[sroeger]

This issue summarizes java tasks from the code. Actually there are two reviews left:

• in OffermanagementRestServiceImpl

REVIEW arturk88 (hohwille) we need to find another way to stream the blob without loading into heap.

and

• in JsonUsernamePasswordAuthenticationFilter

REVIEW may-bee (hohwille) We have a centralized and custom-configured object mapper as spring bean. IMHO we should inject that instance here.

In order to clean up the code those Java Tasks will be removed from the code.

[hohwille]

I checked the first issue because restaurant is a dead-end that will be deleted soon.
The second one could either be solved by just removing the comment (there are only 2 properties mapped so actually no issue) or by just injecting the object mapper.

[hohwille]

Injecting the mapper would create an unnecessary dependency from security to rest. Why doing that and also getting in danger of undersired side-effects?
Also the question is if that class may also be deleted in the future...