These were partially caused by an old Hibernate validator which has now
been replaced by the EclipseLink validator for the current JPA standard.
Another error was caused by the use of non-standard JPQL in the user
search query which has now been replaced by a standardized one.
* added package- and module-info.java, changed JRE from 8 to 11
* moved ObjectProcessor into the processors package
Co-authored-by: CyB3RC0nN0R <kske@outlook.de>
additionally cleaned up whole project, fixed some Javadoc errors and
added a few database and connection options.
Sorry for the huge commit, there was almost no time inbetween where a
commit would have been possible, as to solve every problem, a new
problem arose.
However, as of now, f/message_handling should be ready to be merged into
develop, besides that it could not be tested yet.
