Both the French and the Poles are urging Germany to rearm. As well as the EU, actually, through both the commission and the parliament. The whole "European countries are afraid of Germany invading" argument is not really a thing.
For context: the French and the German have been alternatively at war and allies since the times of Clovis and Charlemagne, a millenium before Bismark made modern Germany a thing (in occupied Versailles, in what was perfectly calibrated to be a complete French humiliation). And the Poles were on the wrong side of brutal occupation and a genocide during WWII. So both countries would have good reasons to be very skeptical of a powerful Germany.
The EU is not worried about Germany re-arming, as the world has changed dramatically since WW2 and we have much stronger bonds in Europe than we did when Nazi Germany was around.
Last century there was the big two, World War One and World War Two. If you go back further it’s more complicated, but the short answer is that Germanic states got into wars with their neighbours a lot. The Wikipedia article has categories.
