tokens: I tried with log4j , by adding a dependency and config file , and it does produce a log file , but only for the initialization of the logger itself , and no logging about when the service is used , although log4j is in TRACE level .
ner_tags: O O O B-Library O O O O O O B-File_Type O O O O O O O B-File_Type O O O O O O O O O B-Class O O O O O O O O O O O O O B-Library O O O O O