Issue-Import-Test

[hendrikebbers]

From @hendrikebbers on May 24, 2018 9:22

The DateConverter of DP uses a SimpleDateFormat instance internally. This instance is used for all convert calls. Since all DateConverters are singletons the same SimpleDateFormat instance will be used for all calls. On the server this means that the same instance will be reused for all clients.

The problem here ist, that the SimpleDateFormat instance can not be used in parallel. Therefore we need to refactor the factory to create a new instance with each call or use thread local instances. More info can be found here: http://blog.udby.com/archives/164

Copied from original issue: canoo/dolphin-platform#909