getMetadataTest sometimes fails

[tyrasd]

Bug Description

see GIScience/ohsome-api-dockerized#29 (comment): sometimes, getMetadataTest fails inexplicably. The bug happens reliably on some computers, but on other machines it never(?) happens. 🤷

General Information

• Version of the ohsome API: master, 1.4.1, etc?
• local instance using H2 test data file
• affects unit tests

Expected Behaviour

The test should not fail.

[joker234]

Additional Information:

• Probably this is due to ExtractMetadata.java:17 being called/initialized before Application.preRun(…) was processed, in some setups.
• Until now, this error only occurred using maven commands, on older Ubuntu (based) machines.

[rtroilo]

• Probably this is due to ExtractMetadata.java:17 being called/initialized before Application.preRun(…) was processed, in some setups.

I think that's the cause!, because the attribution which is loaded from the database and tested before the timeout is correctly returned.
Btw. we should change this preRun logic anyway and use more spring style configuration.

[joker234]

Btw. we should change this preRun logic anyway and use more spring style configuration.

I would agree with that.

We should search for other potential occurrences as well.