Java: add UnitTest annotation

[pascalgrimaud]

Fix #238

[codecov]

Codecov Report

Merging #239 (b6196f1) into main (31eae4f) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##                main      #239   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity       418       418           
===========================================
  Files             75        75           
  Lines           1286      1288    +2     
  Branches          32        32           
===========================================
+ Hits            1286      1288    +2     

Impacted Files	Coverage Δ
...rver/javatool/error/domain/ErrorDomainService.java	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 31eae4f...b6196f1. Read the comment docs.