It's not a big deal, so it's not really worth reading.
Install or decompress Eclipse in a clean OS state. When I set junit in maven, I get an error like "Missing artifact ...". The same phenomenon occurs even if you copy the entire Eclipse from another PC that has no problem and start it with clean.
The same phenomenon as here occurred, but I was confused because some PCs did and some did not.
I'm not sure, but when I ran the following in Eclipse, the error disappeared. Right click on the project-> [Maven]-> [Download Source] If you save pom.xml, it will be downloaded automatically, right?
It is not well understood.
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