I am currently writing my bachelor thesis and since my results were really good, my advisors encouraged me to write a paper about it. The paper was accepted at an international conference and will get published and in the corresponding journal.
I've really invested much time in the paper and the results, thus my thesis fell a bit short. Additionally the topics are identical, because I wrote about the results that I achieved during my work for my thesis. Therefore it is really hard to write a "completely different" text in the thesis compared to the paper.
Moreover the deadline of my thesis ends in 3 weeks...thus, my second advisor suggested to mostly copy+paste stuff of my paper, because it is good and was reviewed several times.
However, my second advisor is always relaxed and calm. I haven't talked to my first advisor about this so far...but I suspect that he would not be too happy if I copy & paste large parts.
What is the "standard" in academia for comparable situations? Would you feel OK with copying certain parts of your paper?
Any advice would be great and really appreciated.
Where I come from it is common for chapters of a PhD thesis to have a lot in common with published papers by the same author - maybe even with copy/pasted sections. The declaration for the thesis is "it's all my own work, and it hasn't previously been submitted for a degree"; there's no requirement that it hasn't been published in a journal.
It's not common for undergraduate dissertations, but that may simply be because it isn't common for undergraduates to publish in the academic literature. In my view the fact that you have done work that is good enough to be published should be a positive thing, not an additional problem for you.
However, whether this is allowed will very much depend on the policies of your universtiy - so definitely talk to your primary advisor about it. Assuming it's allowed then you should note clearly, perhaps in the introduction, that the same work has been / is going to be published in $journal, with a citation. This looks good for you, and also provides an explanation if the thesis gets a red flag from automated plagarism detection software.