Excel Importer errors in Eclipse

I deployed my project to eclipse but I am not able to run it because of errors in the java source code imported with the Excel Importer. Any idea where those errors come from? I am suring JDK 11.5 which I believe is the one to use, I have been using it for several months now with mendix without any issues. As a workaround, I will probably create another project where I can work on the java for my own module but I wonder why an appstore module creates so many errors. I am not good enough in java to understand what those are about.  
1 answers

Seems to be an issue with the java 11 and specific versions of eclipse.

See here for the issue with answer: https://stackoverflow.com/questions/53721522/xml-api-jar-classes-having-issues-with-java-11-in-eclipse-4-9