The first one looks like an AUR package (specifically the PKGBUILD… which you need to accept or exit usually).
Also, as the Arch User Repository … it is technically unsupported. But you can see more about it all here: Arch User Repository - Manjaro
The second one is an over-1-month-old change that was adopted from Arch and mentioned in the update announcements.
PS. I fixed the title and categories because spelling and this has nothing to do with plasma.
PPS.
pamac. You mean pamac. Use the words. pacman couldnt possibly have your first problem.
(because it does not interact directly with the AUR - something you have obviously enabled in the pamac GUI, but do not fully understand)
it can always be that some package conflicts combined with AUR packages may have issues. It seems you use the graphical package manager Pamac. It also works in a terminal by typing pamac upgrade. You can post that output and errors you may have to this thread.
As already mentioned, there are some changes made to JAVA JDK and how they are now maintained. Seems you have at least the Java runtime installed on your system.
To quote the article:
This will (potentially) require a manual user action during upgrade:
If you have both JDK and JRE installed you can manually install the JDK with pacman -Sy jdk-openjdk && pacman -Su (as root user) and this removes the JRE related packages.
If you have both JRE and JRE-headless you will need to choose one of them and install it manually since they would conflict each other now.
If you only have one of the JDK/JRE/JRE-headless pacman should resolve dependencies normally and no action is needed.
Based on your error message you have both JRE and JRE-headless. So you will need to choose one of them and install it manually since they would conflict each other now:
As suggested by @cscs you can do that with sudo pacman -Syuu jre-openjdk.
Or install jre-openjdk before you update the other packages. This you can also do with pamac:
pamac install jre-openjdk
pamac upgrade
If you want jdk-openjdk instead it would be sudo pacman -Syuu jre-openjdk or