On Mon, Mar 29, 2021 at 1:12 PM Andreas Sewe <sewe@xxxxxxx
Is the following something warning to worry about?
The warning explicit the issue: some a.jre.javase units are likely to contain or miss undesired packages. You can worry about it if it's important to you. FWIW, this is a problem that has always existed in Tycho and even p2 with a.jre.javase units; this warning just makes it more visible and explicit because with module java and other things related to standard package, issues caused by a.jre.javase units can become more probable.
The plug-in that's published on the update site is still compatible with
JavaSE-1.8 and (thanks to a toolchain) built against it. So is the
warning something to worry about? Does it many that my update site is
"broken" in some subtle way?
It might be broken eg if someone tries to install your product against Java 16 and Java 16 removes one extra package that you need in your dependencies. In case package is removed in newer Java, installation will succeed but starting the bundle will fail.