Issue while Using Java 8 and Issue in data_resolver.py

[mayman150]

Thank you so much for your contribution.

I just have two main concerns.

Issue While Using Java 8
Unfortunately, I have tried to use Java 8, but it gives me the following error:

However, I changed pom.xml to use Java 11 and Maven Version 3.8.1, and it worked fine to me.

Issue in data_resolver.py

You did not specify which version Pandas I should be using. However, at the moment, using append is no longer maintainable in pandas package.

This issue could be solved by downgrading the Pandas to specific version below 1.4.0, but it is already deprecated according to Pandas' documentation: https://pandas.pydata.org/pandas-docs/version/1.4/reference/api/pandas.DataFrame.append.html.

[snadi]

Thanks for pointing out these issues! Would you be able to contribute a PR to this repo with your fixes? (Whenever you have time)